GNUnet  0.11.x
Data Structures | Macros | Functions
crypto_rsa.c File Reference

Chaum-style Blind signatures based on RSA. More...

#include "platform.h"
#include <gcrypt.h>
#include "gnunet_crypto_lib.h"
#include "benchmark.h"
Include dependency graph for crypto_rsa.c:

Go to the source code of this file.

Data Structures

struct  GNUNET_CRYPTO_RsaPrivateKey
 The private information of an RSA key pair. More...
 
struct  GNUNET_CRYPTO_RsaPublicKey
 The public information of an RSA key pair. More...
 
struct  GNUNET_CRYPTO_RsaSignature
 an RSA signature More...
 
struct  RsaBlindingKey
 RSA blinding key. More...
 
struct  GNUNET_CRYPTO_RsaPublicKeyHeaderP
 Format of the header of a serialized RSA public key. More...
 

Macros

#define LOG(kind, ...)   GNUNET_log_from (kind, "util-crypto-rsa", __VA_ARGS__)
 

Functions

static int key_from_sexp (gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
 Extract values from an S-expression. More...
 
struct GNUNET_CRYPTO_RsaPrivateKeyGNUNET_CRYPTO_rsa_private_key_create (unsigned int len)
 Create a new private key. More...
 
void GNUNET_CRYPTO_rsa_private_key_free (struct GNUNET_CRYPTO_RsaPrivateKey *key)
 Free memory occupied by the private key. More...
 
size_t GNUNET_CRYPTO_rsa_private_key_encode (const struct GNUNET_CRYPTO_RsaPrivateKey *key, void **buffer)
 Encode the private key in a format suitable for storing it into a file. More...
 
struct GNUNET_CRYPTO_RsaPrivateKeyGNUNET_CRYPTO_rsa_private_key_decode (const void *buf, size_t buf_size)
 Decode the private key from the data-format back to the "normal", internal format. More...
 
struct GNUNET_CRYPTO_RsaPublicKeyGNUNET_CRYPTO_rsa_private_key_get_public (const struct GNUNET_CRYPTO_RsaPrivateKey *priv)
 Extract the public key of the given private key. More...
 
void GNUNET_CRYPTO_rsa_public_key_free (struct GNUNET_CRYPTO_RsaPublicKey *key)
 Free memory occupied by the public key. More...
 
GNUNET_NETWORK_STRUCT_END size_t GNUNET_CRYPTO_rsa_public_key_encode (const struct GNUNET_CRYPTO_RsaPublicKey *key, void **buffer)
 Encode the public key in a format suitable for storing it into a file. More...
 
void GNUNET_CRYPTO_rsa_public_key_hash (const struct GNUNET_CRYPTO_RsaPublicKey *key, struct GNUNET_HashCode *hc)
 Compute hash over the public key. More...
 
struct GNUNET_CRYPTO_RsaPublicKeyGNUNET_CRYPTO_rsa_public_key_decode (const char *buf, size_t len)
 Decode the public key from the data-format back to the "normal", internal format. More...
 
static int rsa_gcd_validate (gcry_mpi_t r, gcry_mpi_t n)
 Test for malicious RSA key. More...
 
static struct RsaBlindingKeyrsa_blinding_key_derive (const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks)
 Create a blinding key. More...
 
int GNUNET_CRYPTO_rsa_signature_cmp (const struct GNUNET_CRYPTO_RsaSignature *s1, const struct GNUNET_CRYPTO_RsaSignature *s2)
 Compare the values of two signatures. More...
 
int GNUNET_CRYPTO_rsa_public_key_cmp (const struct GNUNET_CRYPTO_RsaPublicKey *p1, const struct GNUNET_CRYPTO_RsaPublicKey *p2)
 Compare the values of two public keys. More...
 
int GNUNET_CRYPTO_rsa_private_key_cmp (const struct GNUNET_CRYPTO_RsaPrivateKey *p1, const struct GNUNET_CRYPTO_RsaPrivateKey *p2)
 Compare the values of two private keys. More...
 
unsigned int GNUNET_CRYPTO_rsa_public_key_len (const struct GNUNET_CRYPTO_RsaPublicKey *key)
 Obtain the length of the RSA key in bits. More...
 
static void rsa_blinding_key_free (struct RsaBlindingKey *bkey)
 Destroy a blinding key. More...
 
static size_t numeric_mpi_alloc_n_print (gcry_mpi_t v, char **buffer)
 Print an MPI to a newly created buffer. More...
 
static gcry_mpi_t rsa_full_domain_hash (const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_HashCode *hash)
 Computes a full domain hash seeded by the given public key. More...
 
int GNUNET_CRYPTO_rsa_blind (const struct GNUNET_HashCode *hash, const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks, struct GNUNET_CRYPTO_RsaPublicKey *pkey, void **buf, size_t *buf_size)
 Blinds the given message with the given blinding key. More...
 
static gcry_sexp_t mpi_to_sexp (gcry_mpi_t value)
 Convert an MPI to an S-expression suitable for signature operations. More...
 
static struct GNUNET_CRYPTO_RsaSignaturersa_sign_mpi (const struct GNUNET_CRYPTO_RsaPrivateKey *key, gcry_mpi_t value)
 Sign the given MPI. More...
 
struct GNUNET_CRYPTO_RsaSignatureGNUNET_CRYPTO_rsa_sign_blinded (const struct GNUNET_CRYPTO_RsaPrivateKey *key, const void *msg, size_t msg_len)
 Sign a blinded value, which must be a full domain hash of a message. More...
 
struct GNUNET_CRYPTO_RsaSignatureGNUNET_CRYPTO_rsa_sign_fdh (const struct GNUNET_CRYPTO_RsaPrivateKey *key, const struct GNUNET_HashCode *hash)
 Create and sign a full domain hash of a message. More...
 
void GNUNET_CRYPTO_rsa_signature_free (struct GNUNET_CRYPTO_RsaSignature *sig)
 Free memory occupied by signature. More...
 
size_t GNUNET_CRYPTO_rsa_signature_encode (const struct GNUNET_CRYPTO_RsaSignature *sig, void **buffer)
 Encode the given signature in a format suitable for storing it into a file. More...
 
struct GNUNET_CRYPTO_RsaSignatureGNUNET_CRYPTO_rsa_signature_decode (const void *buf, size_t buf_size)
 Decode the signature from the data-format back to the "normal", internal format. More...
 
struct GNUNET_CRYPTO_RsaPublicKeyGNUNET_CRYPTO_rsa_public_key_dup (const struct GNUNET_CRYPTO_RsaPublicKey *key)
 Duplicate the given public key. More...
 
struct GNUNET_CRYPTO_RsaSignatureGNUNET_CRYPTO_rsa_unblind (const struct GNUNET_CRYPTO_RsaSignature *sig, const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks, struct GNUNET_CRYPTO_RsaPublicKey *pkey)
 Unblind a blind-signed signature. More...
 
int GNUNET_CRYPTO_rsa_verify (const struct GNUNET_HashCode *hash, const struct GNUNET_CRYPTO_RsaSignature *sig, const struct GNUNET_CRYPTO_RsaPublicKey *pkey)
 Verify whether the given hash corresponds to the given signature and the signature is valid with respect to the given public key. More...
 
struct GNUNET_CRYPTO_RsaPrivateKeyGNUNET_CRYPTO_rsa_private_key_dup (const struct GNUNET_CRYPTO_RsaPrivateKey *key)
 Duplicate the given private key. More...
 
struct GNUNET_CRYPTO_RsaSignatureGNUNET_CRYPTO_rsa_signature_dup (const struct GNUNET_CRYPTO_RsaSignature *sig)
 Duplicate the given private key. More...
 

Detailed Description

Chaum-style Blind signatures based on RSA.

Author
Sree Harsha Totakura sreeh.nosp@m.arsh.nosp@m.a@tot.nosp@m.akur.nosp@m.a.in
Christian Grothoff
Jeffrey Burdges burdg.nosp@m.es@g.nosp@m.nunet.nosp@m..org

Definition in file crypto_rsa.c.

Macro Definition Documentation

◆ LOG

#define LOG (   kind,
  ... 
)    GNUNET_log_from (kind, "util-crypto-rsa", __VA_ARGS__)

Function Documentation

◆ key_from_sexp()

static int key_from_sexp ( gcry_mpi_t *  array,
gcry_sexp_t  sexp,
const char *  topname,
const char *  elems 
)
static

Extract values from an S-expression.

Parameters
arraywhere to store the result(s)
sexpS-expression to parse
topnametop-level name in the S-expression that is of interest
elemsnames of the elements to extract
Returns
0 on success

Definition at line 94 of file crypto_rsa.c.

References list.

Referenced by GNUNET_CRYPTO_rsa_blind(), GNUNET_CRYPTO_rsa_private_key_get_public(), GNUNET_CRYPTO_rsa_public_key_encode(), GNUNET_CRYPTO_rsa_public_key_len(), GNUNET_CRYPTO_rsa_signature_dup(), GNUNET_CRYPTO_rsa_signature_encode(), GNUNET_CRYPTO_rsa_unblind(), rsa_blinding_key_derive(), and rsa_full_domain_hash().

98 {
99  gcry_sexp_t list;
100  gcry_sexp_t l2;
101  const char *s;
102  unsigned int idx;
103 
104  if (! (list = gcry_sexp_find_token (sexp, topname, 0)))
105  return 1;
106  l2 = gcry_sexp_cadr (list);
107  gcry_sexp_release (list);
108  list = l2;
109  if (! list)
110  return 2;
111  idx = 0;
112  for (s = elems; *s; s++, idx++)
113  {
114  if (! (l2 = gcry_sexp_find_token (list, s, 1)))
115  {
116  for (unsigned int i = 0; i < idx; i++)
117  {
118  gcry_free (array[i]);
119  array[i] = NULL;
120  }
121  gcry_sexp_release (list);
122  return 3; /* required parameter not found */
123  }
124  array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
125  gcry_sexp_release (l2);
126  if (! array[idx])
127  {
128  for (unsigned int i = 0; i < idx; i++)
129  {
130  gcry_free (array[i]);
131  array[i] = NULL;
132  }
133  gcry_sexp_release (list);
134  return 4; /* required parameter is invalid */
135  }
136  }
137  gcry_sexp_release (list);
138  return 0;
139 }
static int list
Set if we should print a list of currently running services.
Definition: gnunet-arm.c:69
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◆ GNUNET_CRYPTO_rsa_private_key_create()

struct GNUNET_CRYPTO_RsaPrivateKey* GNUNET_CRYPTO_rsa_private_key_create ( unsigned int  len)

Create a new private key.

Caller must free return value.

Parameters
lenlength of the key in bits (i.e. 2048)
Returns
fresh private key

Definition at line 149 of file crypto_rsa.c.

References BENCHMARK_END, BENCHMARK_START, GNUNET_assert, GNUNET_new, ret, and GNUNET_CRYPTO_RsaPrivateKey::sexp.

Referenced by run().

150 {
152  gcry_sexp_t s_key;
153  gcry_sexp_t s_keyparam;
154 
155  BENCHMARK_START (rsa_private_key_create);
156 
157  GNUNET_assert (0 ==
158  gcry_sexp_build (&s_keyparam,
159  NULL,
160  "(genkey(rsa(nbits %d)))",
161  len));
162  GNUNET_assert (0 ==
163  gcry_pk_genkey (&s_key,
164  s_keyparam));
165  gcry_sexp_release (s_keyparam);
166 #if EXTRA_CHECKS
167  GNUNET_assert (0 ==
168  gcry_pk_testkey (s_key));
169 #endif
171  ret->sexp = s_key;
172  BENCHMARK_END (rsa_private_key_create);
173  return ret;
174 }
#define BENCHMARK_START(opname)
Definition: benchmark.h:57
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define BENCHMARK_END(opname)
Definition: benchmark.h:58
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_new(type)
Allocate a struct or union of the given type.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
The private information of an RSA key pair.
Definition: crypto_rsa.c:39
uint16_t len
length of data (which is always a uint32_t, but presumably this can be used to specify that fewer byt...
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◆ GNUNET_CRYPTO_rsa_private_key_free()

void GNUNET_CRYPTO_rsa_private_key_free ( struct GNUNET_CRYPTO_RsaPrivateKey key)

Free memory occupied by the private key.

Parameters
keypointer to the memory to free

Definition at line 183 of file crypto_rsa.c.

References GNUNET_free, and GNUNET_CRYPTO_RsaPrivateKey::sexp.

Referenced by GNUNET_CRYPTO_rsa_private_key_decode(), and run().

184 {
185  gcry_sexp_release (key->sexp);
186  GNUNET_free (key);
187 }
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_private_key_encode()

size_t GNUNET_CRYPTO_rsa_private_key_encode ( const struct GNUNET_CRYPTO_RsaPrivateKey key,
void **  buffer 
)

Encode the private key in a format suitable for storing it into a file.

Parameters
keythe private key
[out]bufferset to a buffer with the encoded key
Returns
size of memory allocated in buffer

Definition at line 199 of file crypto_rsa.c.

References testconfigure::b, GNUNET_assert, GNUNET_malloc, and GNUNET_CRYPTO_RsaPrivateKey::sexp.

Referenced by GNUNET_CRYPTO_rsa_private_key_cmp().

202 {
203  size_t n;
204  char *b;
205 
206  n = gcry_sexp_sprint (key->sexp,
207  GCRYSEXP_FMT_DEFAULT,
208  NULL,
209  0);
210  b = GNUNET_malloc (n);
211  GNUNET_assert ((n - 1) == /* since the last byte is \0 */
212  gcry_sexp_sprint (key->sexp,
213  GCRYSEXP_FMT_DEFAULT,
214  b,
215  n));
216  *buffer = b;
217  return n;
218 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
#define GNUNET_malloc(size)
Wrapper around malloc.
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◆ GNUNET_CRYPTO_rsa_private_key_decode()

struct GNUNET_CRYPTO_RsaPrivateKey* GNUNET_CRYPTO_rsa_private_key_decode ( const void *  buf,
size_t  buf_size 
)

Decode the private key from the data-format back to the "normal", internal format.

Parameters
bufthe buffer where the private key data is stored
buf_sizethe size of the data in buf
Returns
NULL on error

Definition at line 230 of file crypto_rsa.c.

References GNUNET_CRYPTO_rsa_private_key_free(), GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_new, key, LOG, and GNUNET_CRYPTO_RsaPrivateKey::sexp.

232 {
234 
236  if (0 !=
237  gcry_sexp_new (&key->sexp,
238  buf,
239  buf_size,
240  0))
241  {
243  "Decoded private key is not valid\n");
244  GNUNET_free (key);
245  return NULL;
246  }
247  if (0 != gcry_pk_testkey (key->sexp))
248  {
250  "Decoded private key is not valid\n");
252  return NULL;
253  }
254  return key;
255 }
#define GNUNET_new(type)
Allocate a struct or union of the given type.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
static char buf[2048]
#define LOG(kind,...)
Definition: crypto_rsa.c:33
struct GNUNET_HashCode key
The key used in the DHT.
void GNUNET_CRYPTO_rsa_private_key_free(struct GNUNET_CRYPTO_RsaPrivateKey *key)
Free memory occupied by the private key.
Definition: crypto_rsa.c:183
The private information of an RSA key pair.
Definition: crypto_rsa.c:39
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_private_key_get_public()

struct GNUNET_CRYPTO_RsaPublicKey* GNUNET_CRYPTO_rsa_private_key_get_public ( const struct GNUNET_CRYPTO_RsaPrivateKey priv)

Extract the public key of the given private key.

Parameters
privthe private key
Returns
NULL on error, otherwise the public key

Definition at line 265 of file crypto_rsa.c.

References BENCHMARK_END, BENCHMARK_START, GNUNET_break_op, GNUNET_new, key_from_sexp(), pub, result, GNUNET_CRYPTO_RsaPrivateKey::sexp, and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by GNUNET_CRYPTO_rsa_sign_fdh(), rsa_sign_mpi(), and run().

267 {
269  gcry_mpi_t ne[2];
270  int rc;
271  gcry_sexp_t result;
272 
273  BENCHMARK_START (rsa_private_key_get_public);
274 
275  rc = key_from_sexp (ne, priv->sexp, "public-key", "ne");
276  if (0 != rc)
277  rc = key_from_sexp (ne, priv->sexp, "private-key", "ne");
278  if (0 != rc)
279  rc = key_from_sexp (ne, priv->sexp, "rsa", "ne");
280  if (0 != rc)
281  {
282  GNUNET_break_op (0);
283  return NULL;
284  }
285  rc = gcry_sexp_build (&result,
286  NULL,
287  "(public-key(rsa(n %m)(e %m)))",
288  ne[0],
289  ne[1]);
290  gcry_mpi_release (ne[0]);
291  gcry_mpi_release (ne[1]);
292  pub = GNUNET_new (struct GNUNET_CRYPTO_RsaPublicKey);
293  pub->sexp = result;
294  BENCHMARK_END (rsa_private_key_get_public);
295  return pub;
296 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
#define BENCHMARK_START(opname)
Definition: benchmark.h:57
#define BENCHMARK_END(opname)
Definition: benchmark.h:58
#define GNUNET_new(type)
Allocate a struct or union of the given type.
The public information of an RSA key pair.
Definition: crypto_rsa.c:51
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
static int result
Global testing status.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
static struct GNUNET_CRYPTO_EddsaPublicKey pub
Definition: gnunet-scrypt.c:46
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◆ GNUNET_CRYPTO_rsa_public_key_free()

void GNUNET_CRYPTO_rsa_public_key_free ( struct GNUNET_CRYPTO_RsaPublicKey key)

Free memory occupied by the public key.

Parameters
keypointer to the memory to free

Definition at line 305 of file crypto_rsa.c.

References GNUNET_free, GNUNET_NETWORK_STRUCT_BEGIN, and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by clean_rsa_pub(), clean_rsa_public_key(), GNUNET_CRYPTO_rsa_sign_fdh(), rsa_sign_mpi(), and run().

306 {
307  gcry_sexp_release (key->sexp);
308  GNUNET_free (key);
309 }
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_public_key_encode()

GNUNET_NETWORK_STRUCT_END size_t GNUNET_CRYPTO_rsa_public_key_encode ( const struct GNUNET_CRYPTO_RsaPublicKey key,
void **  buffer 
)

Encode the public key in a format suitable for storing it into a file.

Parameters
keythe private key
[out]bufferset to a buffer with the encoded key
Returns
size of memory allocated in buffer

Definition at line 346 of file crypto_rsa.c.

References buf, GNUNET_assert, GNUNET_break, GNUNET_malloc, key_from_sexp(), GNUNET_CRYPTO_RsaPublicKeyHeaderP::modulus_length, GNUNET_CRYPTO_RsaPublicKeyHeaderP::public_exponent_length, ret, and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by bind_rsa_pub(), GNUNET_CRYPTO_rsa_public_key_cmp(), GNUNET_CRYPTO_rsa_public_key_hash(), GNUNET_JSON_from_rsa_public_key(), my_conv_rsa_public_key(), qconv_rsa_public_key(), rsa_full_domain_hash(), and run().

349 {
350  gcry_mpi_t ne[2];
351  size_t n_size;
352  size_t e_size;
353  size_t rsize;
354  size_t buf_size;
355  char *buf;
357  int ret;
358 
359  ret = key_from_sexp (ne, key->sexp, "public-key", "ne");
360  if (0 != ret)
361  ret = key_from_sexp (ne, key->sexp, "rsa", "ne");
362  if (0 != ret)
363  {
364  GNUNET_break (0);
365  *buffer = NULL;
366  return 0;
367  }
368  gcry_mpi_print (GCRYMPI_FMT_USG,
369  NULL,
370  0,
371  &n_size,
372  ne[0]);
373  gcry_mpi_print (GCRYMPI_FMT_USG,
374  NULL,
375  0,
376  &e_size,
377  ne[1]);
378  if ( (e_size > UINT16_MAX) ||
379  (n_size > UINT16_MAX) )
380  {
381  GNUNET_break (0);
382  *buffer = NULL;
383  gcry_mpi_release (ne[0]);
384  gcry_mpi_release (ne[1]);
385  return 0;
386  }
387  buf_size = n_size + e_size + sizeof (hdr);
388  buf = GNUNET_malloc (buf_size);
389  hdr.modulus_length = htons ((uint16_t) n_size);
390  hdr.public_exponent_length = htons ((uint16_t) e_size);
391  memcpy (buf, &hdr, sizeof (hdr));
392  GNUNET_assert (0 ==
393  gcry_mpi_print (GCRYMPI_FMT_USG,
394  (unsigned char *) &buf[sizeof (hdr)],
395  n_size,
396  &rsize,
397  ne[0]));
398 
399  GNUNET_assert (0 ==
400  gcry_mpi_print (GCRYMPI_FMT_USG,
401  (unsigned char *) &buf[sizeof (hdr) + n_size],
402  e_size,
403  &rsize,
404  ne[1]));
405  *buffer = buf;
406  gcry_mpi_release (ne[0]);
407  gcry_mpi_release (ne[1]);
408  return buf_size;
409 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
static char buf[2048]
Format of the header of a serialized RSA public key.
Definition: crypto_rsa.c:317
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
#define GNUNET_malloc(size)
Wrapper around malloc.
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◆ GNUNET_CRYPTO_rsa_public_key_hash()

void GNUNET_CRYPTO_rsa_public_key_hash ( const struct GNUNET_CRYPTO_RsaPublicKey key,
struct GNUNET_HashCode hc 
)

Compute hash over the public key.

Parameters
keypublic key to hash
hcwhere to store the hash code

Definition at line 419 of file crypto_rsa.c.

References buf, GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_rsa_public_key_encode(), and GNUNET_free.

421 {
422  void *buf;
423  size_t buf_size;
424 
425  buf_size = GNUNET_CRYPTO_rsa_public_key_encode (key,
426  &buf);
427  GNUNET_CRYPTO_hash (buf,
428  buf_size,
429  hc);
430  GNUNET_free (buf);
431 }
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:48
static char buf[2048]
GNUNET_NETWORK_STRUCT_END size_t GNUNET_CRYPTO_rsa_public_key_encode(const struct GNUNET_CRYPTO_RsaPublicKey *key, void **buffer)
Encode the public key in a format suitable for storing it into a file.
Definition: crypto_rsa.c:346
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_public_key_decode()

struct GNUNET_CRYPTO_RsaPublicKey* GNUNET_CRYPTO_rsa_public_key_decode ( const char *  buf,
size_t  len 
)

Decode the public key from the data-format back to the "normal", internal format.

Parameters
bufthe buffer where the public key data is stored
lenthe length of the data in buf
Returns
NULL on error

Definition at line 443 of file crypto_rsa.c.

References data, e, GNUNET_break, GNUNET_break_op, GNUNET_new, key, GNUNET_CRYPTO_RsaPublicKeyHeaderP::modulus_length, GNUNET_CRYPTO_RsaPublicKeyHeaderP::public_exponent_length, and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by extract_rsa_pub(), extract_rsa_public_key(), parse_rsa_public_key(), and post_extract_rsa_public_key().

445 {
448  size_t e_size;
449  size_t n_size;
450  gcry_mpi_t n;
451  gcry_mpi_t e;
452  gcry_sexp_t data;
453 
454  if (len < sizeof (hdr))
455  {
456  GNUNET_break_op (0);
457  return NULL;
458  }
459  memcpy (&hdr, buf, sizeof (hdr));
460  n_size = ntohs (hdr.modulus_length);
461  e_size = ntohs (hdr.public_exponent_length);
462  if (len != sizeof (hdr) + e_size + n_size)
463  {
464  GNUNET_break_op (0);
465  return NULL;
466  }
467  if (0 !=
468  gcry_mpi_scan (&n,
469  GCRYMPI_FMT_USG,
470  &buf[sizeof (hdr)],
471  n_size,
472  NULL))
473  {
474  GNUNET_break_op (0);
475  return NULL;
476  }
477  if (0 !=
478  gcry_mpi_scan (&e,
479  GCRYMPI_FMT_USG,
480  &buf[sizeof (hdr) + n_size],
481  e_size,
482  NULL))
483  {
484  GNUNET_break_op (0);
485  gcry_mpi_release (n);
486  return NULL;
487  }
488 
489  if (0 !=
490  gcry_sexp_build (&data,
491  NULL,
492  "(public-key(rsa(n %m)(e %m)))",
493  n,
494  e))
495  {
496  GNUNET_break (0);
497  gcry_mpi_release (n);
498  gcry_mpi_release (e);
499  return NULL;
500  }
501  gcry_mpi_release (n);
502  gcry_mpi_release (e);
503  key = GNUNET_new (struct GNUNET_CRYPTO_RsaPublicKey);
504  key->sexp = data;
505  return key;
506 }
static struct Experiment * e
#define GNUNET_new(type)
Allocate a struct or union of the given type.
The public information of an RSA key pair.
Definition: crypto_rsa.c:51
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
static char buf[2048]
Format of the header of a serialized RSA public key.
Definition: crypto_rsa.c:317
struct GNUNET_HashCode key
The key used in the DHT.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
uint32_t data
The data value.
uint16_t len
length of data (which is always a uint32_t, but presumably this can be used to specify that fewer byt...
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◆ rsa_gcd_validate()

static int rsa_gcd_validate ( gcry_mpi_t  r,
gcry_mpi_t  n 
)
static

Test for malicious RSA key.

Assuming n is an RSA modulous and r is generated using a call to GNUNET_CRYPTO_kdf_mod_mpi, if gcd(r,n) != 1 then n must be a malicious RSA key designed to deanomize the user.

Parameters
rKDF result
nRSA modulus
Returns
True if gcd(r,n) = 1, False means RSA key is malicious

Definition at line 521 of file crypto_rsa.c.

References t.

Referenced by rsa_blinding_key_derive(), and rsa_full_domain_hash().

522 {
523  gcry_mpi_t g;
524  int t;
525 
526  g = gcry_mpi_new (0);
527  t = gcry_mpi_gcd (g, r, n);
528  gcry_mpi_release (g);
529  return t;
530 }
static struct GNUNET_SCHEDULER_Task * t
Main task.
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◆ rsa_blinding_key_derive()

static struct RsaBlindingKey* rsa_blinding_key_derive ( const struct GNUNET_CRYPTO_RsaPublicKey pkey,
const struct GNUNET_CRYPTO_RsaBlindingKeySecret bks 
)
static

Create a blinding key.

Parameters
lenlength of the key in bits (i.e. 2048)
bkspre-secret to use to derive the blinding key
Returns
the newly created blinding key, NULL if RSA key is malicious

Definition at line 541 of file crypto_rsa.c.

References GNUNET_assert, GNUNET_CRYPTO_kdf_mod_mpi(), GNUNET_free, GNUNET_new, key_from_sexp(), RsaBlindingKey::r, rsa_gcd_validate(), and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by GNUNET_CRYPTO_rsa_blind(), and GNUNET_CRYPTO_rsa_unblind().

543 {
544  char *xts = "Blinding KDF extractor HMAC key"; /* Trusts bks' randomness more */
545  struct RsaBlindingKey *blind;
546  gcry_mpi_t n;
547 
548  blind = GNUNET_new (struct RsaBlindingKey);
549  GNUNET_assert (NULL != blind);
550 
551  /* Extract the composite n from the RSA public key */
552  GNUNET_assert (0 == key_from_sexp (&n, pkey->sexp, "rsa", "n"));
553  /* Assert that it at least looks like an RSA key */
554  GNUNET_assert (0 == gcry_mpi_get_flag (n, GCRYMPI_FLAG_OPAQUE));
555 
556  GNUNET_CRYPTO_kdf_mod_mpi (&blind->r,
557  n,
558  xts, strlen (xts),
559  bks, sizeof(*bks),
560  "Blinding KDF");
561  if (0 == rsa_gcd_validate (blind->r, n))
562  {
563  GNUNET_free (blind);
564  blind = NULL;
565  }
566 
567  gcry_mpi_release (n);
568  return blind;
569 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
void GNUNET_CRYPTO_kdf_mod_mpi(gcry_mpi_t *r, gcry_mpi_t n, const void *xts, size_t xts_len, const void *skm, size_t skm_len, const char *ctx)
Deterministically generate a pseudo-random number uniformly from the integers modulo a libgcrypt mpi...
Definition: crypto_kdf.c:127
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
gcry_mpi_t r
Random value used for blinding.
Definition: crypto_rsa.c:80
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static int rsa_gcd_validate(gcry_mpi_t r, gcry_mpi_t n)
Test for malicious RSA key.
Definition: crypto_rsa.c:521
RSA blinding key.
Definition: crypto_rsa.c:75
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_signature_cmp()

int GNUNET_CRYPTO_rsa_signature_cmp ( const struct GNUNET_CRYPTO_RsaSignature s1,
const struct GNUNET_CRYPTO_RsaSignature s2 
)

Compare the values of two signatures.

Parameters
s1one signature
s2the other signature
Returns
0 if the two are equal

Definition at line 623 of file crypto_rsa.c.

References GNUNET_CRYPTO_rsa_signature_encode(), GNUNET_free, and ret.

625 {
626  void *b1;
627  void *b2;
628  size_t z1;
629  size_t z2;
630  int ret;
631 
633  &b1);
635  &b2);
636  if (z1 != z2)
637  ret = 1;
638  else
639  ret = memcmp (b1,
640  b2,
641  z1);
642  GNUNET_free (b1);
643  GNUNET_free (b2);
644  return ret;
645 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
size_t GNUNET_CRYPTO_rsa_signature_encode(const struct GNUNET_CRYPTO_RsaSignature *sig, void **buffer)
Encode the given signature in a format suitable for storing it into a file.
Definition: crypto_rsa.c:1076
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_public_key_cmp()

int GNUNET_CRYPTO_rsa_public_key_cmp ( const struct GNUNET_CRYPTO_RsaPublicKey p1,
const struct GNUNET_CRYPTO_RsaPublicKey p2 
)

Compare the values of two public keys.

Parameters
p1one public key
p2the other public key
Returns
0 if the two are equal

Definition at line 656 of file crypto_rsa.c.

References GNUNET_CRYPTO_rsa_public_key_encode(), GNUNET_free, and ret.

658 {
659  void *b1;
660  void *b2;
661  size_t z1;
662  size_t z2;
663  int ret;
664 
666  &b1);
668  &b2);
669  if (z1 != z2)
670  ret = 1;
671  else
672  ret = memcmp (b1,
673  b2,
674  z1);
675  GNUNET_free (b1);
676  GNUNET_free (b2);
677  return ret;
678 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
GNUNET_NETWORK_STRUCT_END size_t GNUNET_CRYPTO_rsa_public_key_encode(const struct GNUNET_CRYPTO_RsaPublicKey *key, void **buffer)
Encode the public key in a format suitable for storing it into a file.
Definition: crypto_rsa.c:346
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_private_key_cmp()

int GNUNET_CRYPTO_rsa_private_key_cmp ( const struct GNUNET_CRYPTO_RsaPrivateKey p1,
const struct GNUNET_CRYPTO_RsaPrivateKey p2 
)

Compare the values of two private keys.

Parameters
p1one private key
p2the other private key
Returns
0 if the two are equal

Definition at line 689 of file crypto_rsa.c.

References GNUNET_CRYPTO_rsa_private_key_encode(), GNUNET_free, and ret.

691 {
692  void *b1;
693  void *b2;
694  size_t z1;
695  size_t z2;
696  int ret;
697 
699  &b1);
701  &b2);
702  if (z1 != z2)
703  ret = 1;
704  else
705  ret = memcmp (b1,
706  b2,
707  z1);
708  GNUNET_free (b1);
709  GNUNET_free (b2);
710  return ret;
711 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
size_t GNUNET_CRYPTO_rsa_private_key_encode(const struct GNUNET_CRYPTO_RsaPrivateKey *key, void **buffer)
Encode the private key in a format suitable for storing it into a file.
Definition: crypto_rsa.c:199
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_public_key_len()

unsigned int GNUNET_CRYPTO_rsa_public_key_len ( const struct GNUNET_CRYPTO_RsaPublicKey key)

Obtain the length of the RSA key in bits.

Parameters
keythe public key to introspect
Returns
length of the key in bits

Definition at line 721 of file crypto_rsa.c.

References GNUNET_break, key_from_sexp(), and GNUNET_CRYPTO_RsaPublicKey::sexp.

722 {
723  gcry_mpi_t n;
724  unsigned int rval;
725 
726  if (0 != key_from_sexp (&n, key->sexp, "rsa", "n"))
727  { /* Not an RSA public key */
728  GNUNET_break (0);
729  return 0;
730  }
731  rval = gcry_mpi_get_nbits (n);
732  gcry_mpi_release (n);
733  return rval;
734 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
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◆ rsa_blinding_key_free()

static void rsa_blinding_key_free ( struct RsaBlindingKey bkey)
static

Destroy a blinding key.

Parameters
bkeythe blinding key to destroy

Definition at line 743 of file crypto_rsa.c.

References GNUNET_free, and RsaBlindingKey::r.

Referenced by GNUNET_CRYPTO_rsa_blind(), and GNUNET_CRYPTO_rsa_unblind().

744 {
745  gcry_mpi_release (bkey->r);
746  GNUNET_free (bkey);
747 }
gcry_mpi_t r
Random value used for blinding.
Definition: crypto_rsa.c:80
#define GNUNET_free(ptr)
Wrapper around free.
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◆ numeric_mpi_alloc_n_print()

static size_t numeric_mpi_alloc_n_print ( gcry_mpi_t  v,
char **  buffer 
)
static

Print an MPI to a newly created buffer.

Parameters
vMPI to print.
[out]newlyallocated buffer containing the result
Returns
number of bytes stored in buffer

Definition at line 758 of file crypto_rsa.c.

References testconfigure::b, GNUNET_assert, and GNUNET_malloc.

Referenced by GNUNET_CRYPTO_rsa_blind().

760 {
761  size_t n;
762  char *b;
763  size_t rsize;
764 
765  gcry_mpi_print (GCRYMPI_FMT_USG,
766  NULL,
767  0,
768  &n,
769  v);
770  b = GNUNET_malloc (n);
771  GNUNET_assert (0 ==
772  gcry_mpi_print (GCRYMPI_FMT_USG,
773  (unsigned char *) b,
774  n,
775  &rsize,
776  v));
777  *buffer = b;
778  return n;
779 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_malloc(size)
Wrapper around malloc.
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◆ rsa_full_domain_hash()

static gcry_mpi_t rsa_full_domain_hash ( const struct GNUNET_CRYPTO_RsaPublicKey pkey,
const struct GNUNET_HashCode hash 
)
static

Computes a full domain hash seeded by the given public key.

This gives a measure of provable security to the Taler exchange against one-more forgery attacks. See: https://eprint.iacr.org/2001/002.pdf http://www.di.ens.fr/~pointche/Documents/Papers/2001_fcA.pdf

Parameters
hashinitial hash of the message to sign
pkeythe public key of the signer
rsizeIf not NULL, the number of bytes actually stored in buffer
Returns
MPI value set to the FDH, NULL if RSA key is malicious

Definition at line 795 of file crypto_rsa.c.

References GNUNET_assert, GNUNET_CRYPTO_kdf_mod_mpi(), GNUNET_CRYPTO_rsa_public_key_encode(), GNUNET_free, key_from_sexp(), ok, RsaBlindingKey::r, rsa_gcd_validate(), and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by GNUNET_CRYPTO_rsa_blind(), GNUNET_CRYPTO_rsa_sign_fdh(), and GNUNET_CRYPTO_rsa_verify().

797 {
798  gcry_mpi_t r, n;
799  void *xts;
800  size_t xts_len;
801  int ok;
802 
803  /* Extract the composite n from the RSA public key */
804  GNUNET_assert (0 == key_from_sexp (&n, pkey->sexp, "rsa", "n"));
805  /* Assert that it at least looks like an RSA key */
806  GNUNET_assert (0 == gcry_mpi_get_flag (n, GCRYMPI_FLAG_OPAQUE));
807 
808  /* We key with the public denomination key as a homage to RSA-PSS by *
809  * Mihir Bellare and Phillip Rogaway. Doing this lowers the degree *
810  * of the hypothetical polyomial-time attack on RSA-KTI created by a *
811  * polynomial-time one-more forgary attack. Yey seeding! */
812  xts_len = GNUNET_CRYPTO_rsa_public_key_encode (pkey, &xts);
813 
815  n,
816  xts, xts_len,
817  hash, sizeof(*hash),
818  "RSA-FDA FTpsW!");
819  GNUNET_free (xts);
820 
821  ok = rsa_gcd_validate (r, n);
822  gcry_mpi_release (n);
823  if (ok)
824  return r;
825  gcry_mpi_release (r);
826  return NULL;
827 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
void GNUNET_CRYPTO_kdf_mod_mpi(gcry_mpi_t *r, gcry_mpi_t n, const void *xts, size_t xts_len, const void *skm, size_t skm_len, const char *ctx)
Deterministically generate a pseudo-random number uniformly from the integers modulo a libgcrypt mpi...
Definition: crypto_kdf.c:127
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
gcry_mpi_t r
Random value used for blinding.
Definition: crypto_rsa.c:80
static int ok
Return value from &#39;main&#39; (0 == success)
static int rsa_gcd_validate(gcry_mpi_t r, gcry_mpi_t n)
Test for malicious RSA key.
Definition: crypto_rsa.c:521
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
GNUNET_NETWORK_STRUCT_END size_t GNUNET_CRYPTO_rsa_public_key_encode(const struct GNUNET_CRYPTO_RsaPublicKey *key, void **buffer)
Encode the public key in a format suitable for storing it into a file.
Definition: crypto_rsa.c:346
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_blind()

int GNUNET_CRYPTO_rsa_blind ( const struct GNUNET_HashCode hash,
const struct GNUNET_CRYPTO_RsaBlindingKeySecret bks,
struct GNUNET_CRYPTO_RsaPublicKey pkey,
void **  buf,
size_t *  buf_size 
)

Blinds the given message with the given blinding key.

Parameters
hashhash of the message to sign
bkeythe blinding key
pkeythe public key of the signer
[out]bufset to a buffer with the blinded message to be signed
[out]buf_sizenumber of bytes stored in buf
Returns
GNUNET_YES if successful, GNUNET_NO if RSA key is malicious

Definition at line 841 of file crypto_rsa.c.

References BENCHMARK_END, BENCHMARK_START, data, GNUNET_assert, GNUNET_break, GNUNET_NO, GNUNET_YES, key_from_sexp(), numeric_mpi_alloc_n_print(), RsaBlindingKey::r, ret, rsa_blinding_key_derive(), rsa_blinding_key_free(), rsa_full_domain_hash(), and GNUNET_CRYPTO_RsaPublicKey::sexp.

Referenced by run().

846 {
847  struct RsaBlindingKey *bkey;
848  gcry_mpi_t data;
849  gcry_mpi_t ne[2];
850  gcry_mpi_t r_e;
851  gcry_mpi_t data_r_e;
852  int ret;
853 
854  BENCHMARK_START (rsa_blind);
855 
856  GNUNET_assert (buf != NULL);
857  GNUNET_assert (buf_size != NULL);
858  ret = key_from_sexp (ne, pkey->sexp, "public-key", "ne");
859  if (0 != ret)
860  ret = key_from_sexp (ne, pkey->sexp, "rsa", "ne");
861  if (0 != ret)
862  {
863  GNUNET_break (0);
864  *buf = NULL;
865  *buf_size = 0;
866  return 0;
867  }
868 
869  data = rsa_full_domain_hash (pkey, hash);
870  if (NULL == data)
871  goto rsa_gcd_validate_failure;
872 
873  bkey = rsa_blinding_key_derive (pkey, bks);
874  if (NULL == bkey)
875  {
876  gcry_mpi_release (data);
877  goto rsa_gcd_validate_failure;
878  }
879 
880  r_e = gcry_mpi_new (0);
881  gcry_mpi_powm (r_e,
882  bkey->r,
883  ne[1],
884  ne[0]);
885  data_r_e = gcry_mpi_new (0);
886  gcry_mpi_mulm (data_r_e,
887  data,
888  r_e,
889  ne[0]);
890  gcry_mpi_release (data);
891  gcry_mpi_release (ne[0]);
892  gcry_mpi_release (ne[1]);
893  gcry_mpi_release (r_e);
894  rsa_blinding_key_free (bkey);
895 
896  *buf_size = numeric_mpi_alloc_n_print (data_r_e,
897  (char **) buf);
898  gcry_mpi_release (data_r_e);
899 
900  BENCHMARK_END (rsa_blind);
901 
902  return GNUNET_YES;
903 
904 rsa_gcd_validate_failure:
905  /* We know the RSA key is malicious here, so warn the wallet. */
906  /* GNUNET_break_op (0); */
907  gcry_mpi_release (ne[0]);
908  gcry_mpi_release (ne[1]);
909  *buf = NULL;
910  *buf_size = 0;
911  return GNUNET_NO;
912 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
static struct RsaBlindingKey * rsa_blinding_key_derive(const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks)
Create a blinding key.
Definition: crypto_rsa.c:541
static gcry_mpi_t rsa_full_domain_hash(const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_HashCode *hash)
Computes a full domain hash seeded by the given public key.
Definition: crypto_rsa.c:795
#define BENCHMARK_START(opname)
Definition: benchmark.h:57
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
gcry_mpi_t r
Random value used for blinding.
Definition: crypto_rsa.c:80
#define BENCHMARK_END(opname)
Definition: benchmark.h:58
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
static size_t numeric_mpi_alloc_n_print(gcry_mpi_t v, char **buffer)
Print an MPI to a newly created buffer.
Definition: crypto_rsa.c:758
static char buf[2048]
RSA blinding key.
Definition: crypto_rsa.c:75
static void rsa_blinding_key_free(struct RsaBlindingKey *bkey)
Destroy a blinding key.
Definition: crypto_rsa.c:743
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
uint32_t data
The data value.
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◆ mpi_to_sexp()

static gcry_sexp_t mpi_to_sexp ( gcry_mpi_t  value)
static

Convert an MPI to an S-expression suitable for signature operations.

Parameters
valuepointer to the data to convert
Returns
converted s-expression

Definition at line 922 of file crypto_rsa.c.

References data, and GNUNET_assert.

Referenced by GNUNET_CRYPTO_rsa_verify(), and rsa_sign_mpi().

923 {
924  gcry_sexp_t data = NULL;
925 
926  GNUNET_assert (0 ==
927  gcry_sexp_build (&data,
928  NULL,
929  "(data (flags raw) (value %M))",
930  value));
931  return data;
932 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static char * value
Value of the record to add/remove.
uint32_t data
The data value.
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◆ rsa_sign_mpi()

static struct GNUNET_CRYPTO_RsaSignature* rsa_sign_mpi ( const struct GNUNET_CRYPTO_RsaPrivateKey key,
gcry_mpi_t  value 
)
static

Sign the given MPI.

Parameters
keyprivate key to use for the signing
valuethe MPI to sign
Returns
NULL on error, signature on success

Definition at line 943 of file crypto_rsa.c.

References _, data, GNUNET_break, GNUNET_CRYPTO_rsa_private_key_get_public(), GNUNET_CRYPTO_rsa_public_key_free(), GNUNET_ERROR_TYPE_WARNING, GNUNET_new, LOG, mpi_to_sexp(), result, GNUNET_CRYPTO_RsaPrivateKey::sexp, GNUNET_CRYPTO_RsaPublicKey::sexp, and GNUNET_CRYPTO_RsaSignature::sexp.

Referenced by GNUNET_CRYPTO_rsa_sign_blinded(), and GNUNET_CRYPTO_rsa_sign_fdh().

945 {
946  struct GNUNET_CRYPTO_RsaSignature *sig;
947  gcry_sexp_t data;
948  gcry_sexp_t result;
949  int rc;
950 
951  data = mpi_to_sexp (value);
952 
953  if (0 !=
954  (rc = gcry_pk_sign (&result,
955  data,
956  key->sexp)))
957  {
959  _ ("RSA signing failed at %s:%d: %s\n"),
960  __FILE__,
961  __LINE__,
962  gcry_strerror (rc));
963  GNUNET_break (0);
964  return NULL;
965  }
966 
967  /* Lenstra protection was first added to libgcrypt 1.6.4
968  * with commit c17f84bd02d7ee93845e92e20f6ddba814961588.
969  */
970 #if GCRYPT_VERSION_NUMBER < 0x010604
971  /* verify signature (guards against Lenstra's attack with fault injection...) */
972  struct GNUNET_CRYPTO_RsaPublicKey *public_key =
974  if (0 !=
975  gcry_pk_verify (result,
976  data,
977  public_key->sexp))
978  {
979  GNUNET_break (0);
981  gcry_sexp_release (data);
982  gcry_sexp_release (result);
983  return NULL;
984  }
986 #endif
987 
988  /* return signature */
989  gcry_sexp_release (data);
990  sig = GNUNET_new (struct GNUNET_CRYPTO_RsaSignature);
991  sig->sexp = result;
992  return sig;
993 }
an RSA signature
Definition: crypto_rsa.c:63
void GNUNET_CRYPTO_rsa_public_key_free(struct GNUNET_CRYPTO_RsaPublicKey *key)
Free memory occupied by the public key.
Definition: crypto_rsa.c:305
struct GNUNET_CRYPTO_RsaPublicKey * GNUNET_CRYPTO_rsa_private_key_get_public(const struct GNUNET_CRYPTO_RsaPrivateKey *priv)
Extract the public key of the given private key.
Definition: crypto_rsa.c:265
#define GNUNET_new(type)
Allocate a struct or union of the given type.
The public information of an RSA key pair.
Definition: crypto_rsa.c:51
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
static gcry_sexp_t mpi_to_sexp(gcry_mpi_t value)
Convert an MPI to an S-expression suitable for signature operations.
Definition: crypto_rsa.c:922
#define _(String)
GNU gettext support macro.
Definition: platform.h:184
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
static char * value
Value of the record to add/remove.
#define LOG(kind,...)
Definition: crypto_rsa.c:33
static int result
Global testing status.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
uint32_t data
The data value.
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◆ GNUNET_CRYPTO_rsa_sign_blinded()

struct GNUNET_CRYPTO_RsaSignature* GNUNET_CRYPTO_rsa_sign_blinded ( const struct GNUNET_CRYPTO_RsaPrivateKey key,
const void *  msg,
size_t  msg_len 
)

Sign a blinded value, which must be a full domain hash of a message.

Parameters
keyprivate key to use for the signing
msgthe message to sign
msg_lennumber of bytes in msg to sign
Returns
NULL on error, signature on success

Definition at line 1005 of file crypto_rsa.c.

References BENCHMARK_END, BENCHMARK_START, GNUNET_assert, and rsa_sign_mpi().

Referenced by run().

1008 {
1009  gcry_mpi_t v = NULL;
1010  struct GNUNET_CRYPTO_RsaSignature *sig;
1011 
1012  BENCHMARK_START (rsa_sign_blinded);
1013 
1014  GNUNET_assert (0 ==
1015  gcry_mpi_scan (&v,
1016  GCRYMPI_FMT_USG,
1017  msg,
1018  msg_len,
1019  NULL));
1020 
1021  sig = rsa_sign_mpi (key, v);
1022  gcry_mpi_release (v);
1023  BENCHMARK_END (rsa_sign_blinded);
1024  return sig;
1025 }
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
an RSA signature
Definition: crypto_rsa.c:63
#define BENCHMARK_START(opname)
Definition: benchmark.h:57
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define BENCHMARK_END(opname)
Definition: benchmark.h:58
static struct GNUNET_CRYPTO_RsaSignature * rsa_sign_mpi(const struct GNUNET_CRYPTO_RsaPrivateKey *key, gcry_mpi_t value)
Sign the given MPI.
Definition: crypto_rsa.c:943
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◆ GNUNET_CRYPTO_rsa_sign_fdh()

struct GNUNET_CRYPTO_RsaSignature* GNUNET_CRYPTO_rsa_sign_fdh ( const struct GNUNET_CRYPTO_RsaPrivateKey key,
const struct GNUNET_HashCode hash 
)

Create and sign a full domain hash of a message.

Parameters
keyprivate key to use for the signing
hashthe hash of the message to sign
Returns
NULL on error, including a malicious RSA key, signature on success

Definition at line 1036 of file crypto_rsa.c.

References GNUNET_CRYPTO_rsa_private_key_get_public(), GNUNET_CRYPTO_rsa_public_key_free(), pkey, rsa_full_domain_hash(), and rsa_sign_mpi().

1038 {
1040  gcry_mpi_t v = NULL;
1041  struct GNUNET_CRYPTO_RsaSignature *sig;
1042 
1044  v = rsa_full_domain_hash (pkey, hash);
1046  if (NULL == v) /* rsa_gcd_validate failed meaning */
1047  return NULL; /* our *own* RSA key is malicious. */
1048 
1049  sig = rsa_sign_mpi (key, v);
1050  gcry_mpi_release (v);
1051  return sig;
1052 }
static char * pkey
Public key of the zone to look in, in ASCII.
an RSA signature
Definition: crypto_rsa.c:63
static gcry_mpi_t rsa_full_domain_hash(const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_HashCode *hash)
Computes a full domain hash seeded by the given public key.
Definition: crypto_rsa.c:795
void GNUNET_CRYPTO_rsa_public_key_free(struct GNUNET_CRYPTO_RsaPublicKey *key)
Free memory occupied by the public key.
Definition: crypto_rsa.c:305
struct GNUNET_CRYPTO_RsaPublicKey * GNUNET_CRYPTO_rsa_private_key_get_public(const struct GNUNET_CRYPTO_RsaPrivateKey *priv)
Extract the public key of the given private key.
Definition: crypto_rsa.c:265
The public information of an RSA key pair.
Definition: crypto_rsa.c:51
static struct GNUNET_CRYPTO_RsaSignature * rsa_sign_mpi(const struct GNUNET_CRYPTO_RsaPrivateKey *key, gcry_mpi_t value)
Sign the given MPI.
Definition: crypto_rsa.c:943
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◆ GNUNET_CRYPTO_rsa_signature_free()

void GNUNET_CRYPTO_rsa_signature_free ( struct GNUNET_CRYPTO_RsaSignature sig)

Free memory occupied by signature.

Parameters
sigmemory to free

Definition at line 1061 of file crypto_rsa.c.

References GNUNET_free, and GNUNET_CRYPTO_RsaSignature::sexp.

Referenced by clean_rsa_sig(), clean_rsa_signature(), and run().

1062 {
1063  gcry_sexp_release (sig->sexp);
1064  GNUNET_free (sig);
1065 }
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_rsa_signature_encode()

size_t GNUNET_CRYPTO_rsa_signature_encode ( const struct GNUNET_CRYPTO_RsaSignature sig,
void **  buffer 
)

Encode the given signature in a format suitable for storing it into a file.

Parameters
sigthe signature
[out]bufferset to a buffer with the encoded key
Returns
size of memory allocated in buffer

Definition at line 1076 of file crypto_rsa.c.

References buf, GNUNET_assert, GNUNET_malloc, key_from_sexp(), ret, and GNUNET_CRYPTO_RsaSignature::sexp.

Referenced by bind_rsa_sig(), GNUNET_CRYPTO_rsa_signature_cmp(), GNUNET_JSON_from_rsa_signature(), my_conv_rsa_signature(), qconv_rsa_signature(), and run().

1079 {
1080  gcry_mpi_t s;
1081  size_t buf_size;
1082  size_t rsize;
1083  unsigned char *buf;
1084  int ret;
1085 
1086  ret = key_from_sexp (&s,
1087  sig->sexp,
1088  "sig-val",
1089  "s");
1090  if (0 != ret)
1091  ret = key_from_sexp (&s,
1092  sig->sexp,
1093  "rsa",
1094  "s");
1095  GNUNET_assert (0 == ret);
1096  gcry_mpi_print (GCRYMPI_FMT_USG,
1097  NULL,
1098  0,
1099  &buf_size,
1100  s);
1101  buf = GNUNET_malloc (buf_size);
1102  GNUNET_assert (0 ==
1103  gcry_mpi_print (GCRYMPI_FMT_USG,
1104  buf,
1105  buf_size,
1106  &rsize,
1107  s));
1108  GNUNET_assert (rsize == buf_size);
1109  *buffer = (void *) buf;
1110  gcry_mpi_release (s);
1111  return buf_size;
1112 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static char buf[2048]
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
#define GNUNET_malloc(size)
Wrapper around malloc.
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◆ GNUNET_CRYPTO_rsa_signature_decode()

struct GNUNET_CRYPTO_RsaSignature* GNUNET_CRYPTO_rsa_signature_decode ( const void *  buf,
size_t  buf_size 
)

Decode the signature from the data-format back to the "normal", internal format.

Parameters
bufthe buffer where the public key data is stored
buf_sizethe size of the data in buf
Returns
NULL on error

Definition at line 1124 of file crypto_rsa.c.

References data, GNUNET_break, GNUNET_break_op, GNUNET_new, and GNUNET_CRYPTO_RsaSignature::sexp.

Referenced by extract_rsa_sig(), extract_rsa_signature(), parse_rsa_signature(), and post_extract_rsa_signature().

1126 {
1127  struct GNUNET_CRYPTO_RsaSignature *sig;
1128  gcry_mpi_t s;
1129  gcry_sexp_t data;
1130 
1131  if (0 !=
1132  gcry_mpi_scan (&s,
1133  GCRYMPI_FMT_USG,
1134  buf,
1135  buf_size,
1136  NULL))
1137  {
1138  GNUNET_break_op (0);
1139  return NULL;
1140  }
1141 
1142  if (0 !=
1143  gcry_sexp_build (&data,
1144  NULL,
1145  "(sig-val(rsa(s %M)))",
1146  s))
1147  {
1148  GNUNET_break (0);
1149  gcry_mpi_release (s);
1150  return NULL;
1151  }
1152  gcry_mpi_release (s);
1153  sig = GNUNET_new (struct GNUNET_CRYPTO_RsaSignature);
1154  sig->sexp = data;
1155  return sig;
1156 }
an RSA signature
Definition: crypto_rsa.c:63
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
static char buf[2048]
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
uint32_t data
The data value.
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◆ GNUNET_CRYPTO_rsa_public_key_dup()

struct GNUNET_CRYPTO_RsaPublicKey* GNUNET_CRYPTO_rsa_public_key_dup ( const struct GNUNET_CRYPTO_RsaPublicKey key)

Duplicate the given public key.

Parameters
keythe public key to duplicate
Returns
the duplicate key; NULL upon error

Definition at line 1166 of file crypto_rsa.c.

References GNUNET_assert, GNUNET_new, and GNUNET_CRYPTO_RsaPublicKey::sexp.

1167 {
1168  struct GNUNET_CRYPTO_RsaPublicKey *dup;
1169  gcry_sexp_t dup_sexp;
1170  size_t erroff;
1171 
1172  /* check if we really are exporting a public key */
1173  dup_sexp = gcry_sexp_find_token (key->sexp, "public-key", 0);
1174  GNUNET_assert (NULL != dup_sexp);
1175  gcry_sexp_release (dup_sexp);
1176  /* copy the sexp */
1177  GNUNET_assert (0 == gcry_sexp_build (&dup_sexp, &erroff, "%S", key->sexp));
1178  dup = GNUNET_new (struct GNUNET_CRYPTO_RsaPublicKey);
1179  dup->sexp = dup_sexp;
1180  return dup;
1181 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
The public information of an RSA key pair.
Definition: crypto_rsa.c:51
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56

◆ GNUNET_CRYPTO_rsa_unblind()

struct GNUNET_CRYPTO_RsaSignature* GNUNET_CRYPTO_rsa_unblind ( const struct GNUNET_CRYPTO_RsaSignature sig,
const struct GNUNET_CRYPTO_RsaBlindingKeySecret bks,
struct GNUNET_CRYPTO_RsaPublicKey pkey 
)

Unblind a blind-signed signature.

The signature should have been generated with #GNUNET_CRYPTO_rsa_sign() using a hash that was blinded with GNUNET_CRYPTO_rsa_blind().

Parameters
sigthe signature made on the blinded signature purpose
bksthe blinding key secret used to blind the signature purpose
pkeythe public key of the signer
Returns
unblinded signature on success, NULL if RSA key is bad or malicious.

Definition at line 1195 of file crypto_rsa.c.

References BENCHMARK_END, BENCHMARK_START, GNUNET_assert, GNUNET_break_op, GNUNET_new, key_from_sexp(), RsaBlindingKey::r, ret, rsa_blinding_key_derive(), rsa_blinding_key_free(), GNUNET_CRYPTO_RsaPublicKey::sexp, and GNUNET_CRYPTO_RsaSignature::sexp.

Referenced by run().

1198 {
1199  struct RsaBlindingKey *bkey;
1200  gcry_mpi_t n;
1201  gcry_mpi_t s;
1202  gcry_mpi_t r_inv;
1203  gcry_mpi_t ubsig;
1204  int ret;
1205  struct GNUNET_CRYPTO_RsaSignature *sret;
1206 
1207  BENCHMARK_START (rsa_unblind);
1208 
1209  ret = key_from_sexp (&n, pkey->sexp, "public-key", "n");
1210  if (0 != ret)
1211  ret = key_from_sexp (&n, pkey->sexp, "rsa", "n");
1212  if (0 != ret)
1213  {
1214  GNUNET_break_op (0);
1215  return NULL;
1216  }
1217  ret = key_from_sexp (&s, sig->sexp, "sig-val", "s");
1218  if (0 != ret)
1219  ret = key_from_sexp (&s, sig->sexp, "rsa", "s");
1220  if (0 != ret)
1221  {
1222  gcry_mpi_release (n);
1223  GNUNET_break_op (0);
1224  return NULL;
1225  }
1226 
1227  bkey = rsa_blinding_key_derive (pkey, bks);
1228  if (NULL == bkey)
1229  {
1230  /* RSA key is malicious since rsa_gcd_validate failed here.
1231  * It should have failed during GNUNET_CRYPTO_rsa_blind too though,
1232  * so the exchange is being malicious in an unfamilair way, maybe
1233  * just trying to crash us. */
1234  GNUNET_break_op (0);
1235  gcry_mpi_release (n);
1236  gcry_mpi_release (s);
1237  return NULL;
1238  }
1239 
1240  r_inv = gcry_mpi_new (0);
1241  if (1 !=
1242  gcry_mpi_invm (r_inv,
1243  bkey->r,
1244  n))
1245  {
1246  /* We cannot find r mod n, so gcd(r,n) != 1, which should get *
1247  * caught above, but we handle it the same here. */
1248  GNUNET_break_op (0);
1249  gcry_mpi_release (r_inv);
1250  rsa_blinding_key_free (bkey);
1251  gcry_mpi_release (n);
1252  gcry_mpi_release (s);
1253  return NULL;
1254  }
1255 
1256  ubsig = gcry_mpi_new (0);
1257  gcry_mpi_mulm (ubsig, s, r_inv, n);
1258  gcry_mpi_release (n);
1259  gcry_mpi_release (r_inv);
1260  gcry_mpi_release (s);
1261  rsa_blinding_key_free (bkey);
1262 
1263  sret = GNUNET_new (struct GNUNET_CRYPTO_RsaSignature);
1264  GNUNET_assert (0 ==
1265  gcry_sexp_build (&sret->sexp,
1266  NULL,
1267  "(sig-val (rsa (s %M)))",
1268  ubsig));
1269  gcry_mpi_release (ubsig);
1270  BENCHMARK_END (rsa_unblind);
1271  return sret;
1272 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
static struct RsaBlindingKey * rsa_blinding_key_derive(const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks)
Create a blinding key.
Definition: crypto_rsa.c:541
an RSA signature
Definition: crypto_rsa.c:63
#define BENCHMARK_START(opname)
Definition: benchmark.h:57
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
gcry_mpi_t r
Random value used for blinding.
Definition: crypto_rsa.c:80
#define BENCHMARK_END(opname)
Definition: benchmark.h:58
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
RSA blinding key.
Definition: crypto_rsa.c:75
static void rsa_blinding_key_free(struct RsaBlindingKey *bkey)
Destroy a blinding key.
Definition: crypto_rsa.c:743
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
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◆ GNUNET_CRYPTO_rsa_verify()

int GNUNET_CRYPTO_rsa_verify ( const struct GNUNET_HashCode hash,
const struct GNUNET_CRYPTO_RsaSignature sig,
const struct GNUNET_CRYPTO_RsaPublicKey pkey 
)

Verify whether the given hash corresponds to the given signature and the signature is valid with respect to the given public key.

Parameters
hashhash of the message to verify to match the sig
sigsignature that is being validated
pkeypublic key of the signer
Returns
GNUNET_YES if ok, GNUNET_NO if RSA key is malicious, GNUNET_SYSERR if signature is invalid

Definition at line 1285 of file crypto_rsa.c.

References _, BENCHMARK_END, BENCHMARK_START, data, GNUNET_break_op, GNUNET_ERROR_TYPE_WARNING, GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, LOG, mpi_to_sexp(), rsa_full_domain_hash(), GNUNET_CRYPTO_RsaPublicKey::sexp, and GNUNET_CRYPTO_RsaSignature::sexp.

Referenced by run().

1288 {
1289  gcry_sexp_t data;
1290  gcry_mpi_t r;
1291  int rc;
1292 
1293  BENCHMARK_START (rsa_verify);
1294 
1295  r = rsa_full_domain_hash (pkey, hash);
1296  if (NULL == r)
1297  {
1298  GNUNET_break_op (0);
1299  /* RSA key is malicious since rsa_gcd_validate failed here.
1300  * It should have failed during GNUNET_CRYPTO_rsa_blind too though,
1301  * so the exchange is being malicious in an unfamilair way, maybe
1302  * just trying to crash us. Arguably, we've only an internal error
1303  * though because we should've detected this in our previous call
1304  * to GNUNET_CRYPTO_rsa_unblind. *///
1305  return GNUNET_NO;
1306  }
1307 
1308  data = mpi_to_sexp (r);
1309  gcry_mpi_release (r);
1310 
1311  rc = gcry_pk_verify (sig->sexp,
1312  data,
1313  pkey->sexp);
1314  gcry_sexp_release (data);
1315  if (0 != rc)
1316  {
1318  _ ("RSA signature verification failed at %s:%d: %s\n"),
1319  __FILE__,
1320  __LINE__,
1321  gcry_strerror (rc));
1322  return GNUNET_SYSERR;
1323  BENCHMARK_END (rsa_verify);
1324  }
1325  BENCHMARK_END (rsa_verify);
1326  return GNUNET_OK;
1327 }
static gcry_mpi_t rsa_full_domain_hash(const struct GNUNET_CRYPTO_RsaPublicKey *pkey, const struct GNUNET_HashCode *hash)
Computes a full domain hash seeded by the given public key.
Definition: crypto_rsa.c:795
#define BENCHMARK_START(opname)
Definition: benchmark.h:57
#define BENCHMARK_END(opname)
Definition: benchmark.h:58
static gcry_sexp_t mpi_to_sexp(gcry_mpi_t value)
Convert an MPI to an S-expression suitable for signature operations.
Definition: crypto_rsa.c:922
#define _(String)
GNU gettext support macro.
Definition: platform.h:184
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
#define LOG(kind,...)
Definition: crypto_rsa.c:33
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA public key.
Definition: crypto_rsa.c:56
uint32_t data
The data value.
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◆ GNUNET_CRYPTO_rsa_private_key_dup()

struct GNUNET_CRYPTO_RsaPrivateKey* GNUNET_CRYPTO_rsa_private_key_dup ( const struct GNUNET_CRYPTO_RsaPrivateKey key)

Duplicate the given private key.

Parameters
keythe private key to duplicate
Returns
the duplicate key; NULL upon error

Definition at line 1337 of file crypto_rsa.c.

References GNUNET_assert, GNUNET_new, and GNUNET_CRYPTO_RsaPrivateKey::sexp.

1339 {
1340  struct GNUNET_CRYPTO_RsaPrivateKey *dup;
1341  gcry_sexp_t dup_sexp;
1342  size_t erroff;
1343 
1344  /* check if we really are exporting a private key */
1345  dup_sexp = gcry_sexp_find_token (key->sexp, "private-key", 0);
1346  GNUNET_assert (NULL != dup_sexp);
1347  gcry_sexp_release (dup_sexp);
1348  /* copy the sexp */
1349  GNUNET_assert (0 == gcry_sexp_build (&dup_sexp, &erroff, "%S", key->sexp));
1350  dup = GNUNET_new (struct GNUNET_CRYPTO_RsaPrivateKey);
1351  dup->sexp = dup_sexp;
1352  return dup;
1353 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA private key.
Definition: crypto_rsa.c:44
The private information of an RSA key pair.
Definition: crypto_rsa.c:39

◆ GNUNET_CRYPTO_rsa_signature_dup()

struct GNUNET_CRYPTO_RsaSignature* GNUNET_CRYPTO_rsa_signature_dup ( const struct GNUNET_CRYPTO_RsaSignature sig)

Duplicate the given private key.

Duplicate the given rsa signature.

Parameters
keythe private key to duplicate
Returns
the duplicate key; NULL upon error

Definition at line 1363 of file crypto_rsa.c.

References GNUNET_assert, GNUNET_new, key_from_sexp(), ret, and GNUNET_CRYPTO_RsaSignature::sexp.

1364 {
1365  struct GNUNET_CRYPTO_RsaSignature *dup;
1366  gcry_sexp_t dup_sexp;
1367  size_t erroff;
1368  gcry_mpi_t s;
1369  int ret;
1370 
1371  /* verify that this is an RSA signature */
1372  ret = key_from_sexp (&s, sig->sexp, "sig-val", "s");
1373  if (0 != ret)
1374  ret = key_from_sexp (&s, sig->sexp, "rsa", "s");
1375  GNUNET_assert (0 == ret);
1376  gcry_mpi_release (s);
1377  /* copy the sexp */
1378  GNUNET_assert (0 == gcry_sexp_build (&dup_sexp, &erroff, "%S", sig->sexp));
1379  dup = GNUNET_new (struct GNUNET_CRYPTO_RsaSignature);
1380  dup->sexp = dup_sexp;
1381  return dup;
1382 }
static int key_from_sexp(gcry_mpi_t *array, gcry_sexp_t sexp, const char *topname, const char *elems)
Extract values from an S-expression.
Definition: crypto_rsa.c:94
an RSA signature
Definition: crypto_rsa.c:63
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_new(type)
Allocate a struct or union of the given type.
gcry_sexp_t sexp
Libgcrypt S-expression for the RSA signature.
Definition: crypto_rsa.c:68
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