GNUnet  0.11.x
Macros | Functions
crypto_ecc.c File Reference

public key cryptography (ECC) with libgcrypt More...

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

Go to the source code of this file.

Macros

#define EXTRA_CHECKS   0
 
#define CURVE   "Ed25519"
 Name of the curve we are using. More...
 
#define LOG(kind, ...)   GNUNET_log_from (kind, "util-crypto-ecc", __VA_ARGS__)
 
#define LOG_STRERROR(kind, syscall)   GNUNET_log_from_strerror (kind, "util-crypto-ecc", syscall)
 
#define LOG_STRERROR_FILE(kind, syscall, filename)   GNUNET_log_from_strerror_file (kind, "util-crypto-ecc", syscall, filename)
 
#define LOG_GCRY(level, cmd, rc)
 Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the message given by gcry_strerror(rc). More...
 

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...
 
static gcry_sexp_t decode_private_ecdsa_key (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv)
 Convert the given private key from the network format to the S-expression that can be used by libgcrypt. More...
 
void GNUNET_CRYPTO_ecdsa_key_get_public (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
 Extract the public key for the given private key. More...
 
void GNUNET_CRYPTO_eddsa_key_get_public (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
 Extract the public key for the given private key. More...
 
void GNUNET_CRYPTO_ecdhe_key_get_public (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
 Extract the public key for the given private key. More...
 
char * GNUNET_CRYPTO_ecdsa_public_key_to_string (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
 Convert a public key to a string. More...
 
char * GNUNET_CRYPTO_eddsa_public_key_to_string (const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
 Convert a public key to a string. More...
 
char * GNUNET_CRYPTO_eddsa_private_key_to_string (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv)
 Convert a private key to a string. More...
 
char * GNUNET_CRYPTO_ecdsa_private_key_to_string (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv)
 Convert a private key to a string. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdsa_public_key_from_string (const char *enc, size_t enclen, struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
 Convert a string representing a public key to a public key. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_public_key_from_string (const char *enc, size_t enclen, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
 Convert a string representing a public key to a public key. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_private_key_from_string (const char *enc, size_t enclen, struct GNUNET_CRYPTO_EddsaPrivateKey *priv)
 Convert a string representing a private key to a private key. More...
 
void GNUNET_CRYPTO_ecdhe_key_clear (struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
 Clear memory that was used to store a private key. More...
 
void GNUNET_CRYPTO_ecdsa_key_clear (struct GNUNET_CRYPTO_EcdsaPrivateKey *pk)
 Clear memory that was used to store a private key. More...
 
void GNUNET_CRYPTO_eddsa_key_clear (struct GNUNET_CRYPTO_EddsaPrivateKey *pk)
 Clear memory that was used to store a private key. More...
 
void GNUNET_CRYPTO_ecdhe_key_create (struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
 Create a new private key. More...
 
void GNUNET_CRYPTO_ecdsa_key_create (struct GNUNET_CRYPTO_EcdsaPrivateKey *pk)
 Create a new private key. More...
 
void GNUNET_CRYPTO_eddsa_key_create (struct GNUNET_CRYPTO_EddsaPrivateKey *pk)
 Create a new private key. More...
 
const struct GNUNET_CRYPTO_EcdsaPrivateKeyGNUNET_CRYPTO_ecdsa_key_get_anonymous ()
 Get the shared private key we use for anonymous users. More...
 
static gcry_sexp_t data_to_ecdsa_value (const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose)
 Convert the data specified in the given purpose argument to an S-expression suitable for signature operations. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdsa_sign_ (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EcdsaSignature *sig)
 ECDSA Sign a given block. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_sign_ (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
 EdDSA sign a given block. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdsa_verify_ (uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EcdsaSignature *sig, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
 Verify ECDSA signature. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_verify_ (uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EddsaSignature *sig, const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
 Verify EdDSA signature. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecc_ecdh (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
 Derive key material from a public and a private ECC key. More...
 
static gcry_mpi_t derive_h (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub, const char *label, const char *context)
 Derive the 'h' value for key derivation, where 'h = H(l,P)'. More...
 
struct GNUNET_CRYPTO_EcdsaPrivateKeyGNUNET_CRYPTO_ecdsa_private_key_derive (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const char *label, const char *context)
 Derive a private key from a given private key and a label. More...
 
void GNUNET_CRYPTO_ecdsa_public_key_derive (const struct GNUNET_CRYPTO_EcdsaPublicKey *pub, const char *label, const char *context, struct GNUNET_CRYPTO_EcdsaPublicKey *result)
 Derive a public key from a given public key and a label. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_ecdh (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
 Derive key material from a ECDH public key and a private EdDSA key. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdsa_ecdh (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
 Derive key material from a ECDH public key and a private ECDSA key. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdh_eddsa (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EddsaPublicKey *pub, struct GNUNET_HashCode *key_material)
 Derive key material from a EdDSA public key and a private ECDH key. More...
 
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdh_ecdsa (const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub, struct GNUNET_HashCode *key_material)
 Derive key material from a EcDSA public key and a private ECDH key. More...
 

Detailed Description

public key cryptography (ECC) with libgcrypt

Author
Christian Grothoff
Florian Dold

Definition in file crypto_ecc.c.

Macro Definition Documentation

◆ EXTRA_CHECKS

#define EXTRA_CHECKS   0

Definition at line 34 of file crypto_ecc.c.

◆ CURVE

#define CURVE   "Ed25519"

Name of the curve we are using.

Note that we have hard-coded structs that use 256 bits, so using a bigger curve will require changes that break stuff badly. The name of the curve given here must be agreed by all peers and be supported by libgcrypt.

Definition at line 43 of file crypto_ecc.c.

Referenced by decode_private_ecdsa_key(), GNUNET_CRYPTO_ecdsa_private_key_derive(), GNUNET_CRYPTO_ecdsa_public_key_derive(), and GNUNET_CRYPTO_ecdsa_verify_().

◆ LOG

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

Definition at line 45 of file crypto_ecc.c.

Referenced by GNUNET_CRYPTO_ecdsa_sign_(), and GNUNET_CRYPTO_ecdsa_verify_().

◆ LOG_STRERROR

#define LOG_STRERROR (   kind,
  syscall 
)    GNUNET_log_from_strerror (kind, "util-crypto-ecc", syscall)

Definition at line 47 of file crypto_ecc.c.

◆ LOG_STRERROR_FILE

#define LOG_STRERROR_FILE (   kind,
  syscall,
  filename 
)    GNUNET_log_from_strerror_file (kind, "util-crypto-ecc", syscall, filename)

Definition at line 50 of file crypto_ecc.c.

◆ LOG_GCRY

#define LOG_GCRY (   level,
  cmd,
  rc 
)
Value:
do \
{ \
LOG (level, \
_ ("`%s' failed at %s:%d with error: %s\n"), \
cmd, \
__FILE__, \
__LINE__, \
gcry_strerror (rc)); \
} while (0)
#define _(String)
GNU gettext support macro.
Definition: platform.h:184

Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the message given by gcry_strerror(rc).

Definition at line 58 of file crypto_ecc.c.

Referenced by data_to_ecdsa_value(), decode_private_ecdsa_key(), and GNUNET_CRYPTO_ecdsa_verify_().

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 80 of file crypto_ecc.c.

References list.

Referenced by GNUNET_CRYPTO_ecdsa_sign_().

84 {
85  gcry_sexp_t list;
86  gcry_sexp_t l2;
87  unsigned int idx;
88 
89  list = gcry_sexp_find_token (sexp, topname, 0);
90  if (! list)
91  return 1;
92  l2 = gcry_sexp_cadr (list);
93  gcry_sexp_release (list);
94  list = l2;
95  if (! list)
96  return 2;
97 
98  idx = 0;
99  for (const char *s = elems; *s; s++, idx++)
100  {
101  l2 = gcry_sexp_find_token (list, s, 1);
102  if (! l2)
103  {
104  for (unsigned int i = 0; i < idx; i++)
105  {
106  gcry_free (array[i]);
107  array[i] = NULL;
108  }
109  gcry_sexp_release (list);
110  return 3; /* required parameter not found */
111  }
112  array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
113  gcry_sexp_release (l2);
114  if (! array[idx])
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 4; /* required parameter is invalid */
123  }
124  }
125  gcry_sexp_release (list);
126  return 0;
127 }
static int list
Set if we should print a list of currently running services.
Definition: gnunet-arm.c:69
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◆ decode_private_ecdsa_key()

static gcry_sexp_t decode_private_ecdsa_key ( const struct GNUNET_CRYPTO_EcdsaPrivateKey priv)
static

Convert the given private key from the network format to the S-expression that can be used by libgcrypt.

Parameters
privprivate key to decode
Returns
NULL on error

Definition at line 138 of file crypto_ecc.c.

References CURVE, GNUNET_CRYPTO_EcdsaPrivateKey::d, GNUNET_assert, GNUNET_ERROR_TYPE_ERROR, LOG_GCRY, and result.

Referenced by GNUNET_CRYPTO_ecdsa_sign_().

139 {
140  gcry_sexp_t result;
141  int rc;
142  uint8_t d[32];
143 
144  for (size_t i = 0; i<32; i++)
145  d[i] = priv->d[31 - i];
146 
147  rc = gcry_sexp_build (&result,
148  NULL,
149  "(private-key(ecc(curve \"" CURVE "\")"
150  "(d %b)))",
151  32,
152  d);
153  if (0 != rc)
154  {
155  LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
156  GNUNET_assert (0);
157  }
158 #if EXTRA_CHECKS
159  if (0 != (rc = gcry_pk_testkey (result)))
160  {
161  LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_pk_testkey", rc);
162  GNUNET_assert (0);
163  }
164 #endif
165  return result;
166 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int result
Global testing status.
#define LOG_GCRY(level, cmd, rc)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
Definition: crypto_ecc.c:58
#define CURVE
Name of the curve we are using.
Definition: crypto_ecc.c:43
unsigned char d[256/8]
d is a value mod n, where n has at most 256 bits.
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◆ GNUNET_CRYPTO_ecdsa_public_key_to_string()

char* GNUNET_CRYPTO_ecdsa_public_key_to_string ( const struct GNUNET_CRYPTO_EcdsaPublicKey pub)

Convert a public key to a string.

Parameters
pubkey to convert
Returns
string representing pub

Definition at line 208 of file crypto_ecc.c.

References end, GNUNET_free, GNUNET_malloc, and GNUNET_STRINGS_data_to_string().

Referenced by abd_value_to_string(), delegation_chain_fw_resolution_start(), forward_resolution(), get_ego(), GNUNET_ABD_delegate_to_string(), handle_intermediate_result(), handle_verify_result(), print_deleset(), and store_cb().

210 {
211  char *pubkeybuf;
212  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
213  char *end;
214 
215  if (keylen % 5 > 0)
216  keylen += 5 - keylen % 5;
217  keylen /= 5;
218  pubkeybuf = GNUNET_malloc (keylen + 1);
219  end =
220  GNUNET_STRINGS_data_to_string ((unsigned char *) pub,
221  sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
222  pubkeybuf,
223  keylen);
224  if (NULL == end)
225  {
226  GNUNET_free (pubkeybuf);
227  return NULL;
228  }
229  *end = '\0';
230  return pubkeybuf;
231 }
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
#define GNUNET_malloc(size)
Wrapper around malloc.
char * GNUNET_STRINGS_data_to_string(const void *data, size_t size, char *out, size_t out_size)
Convert binary data to ASCII encoding using CrockfordBase32.
Definition: strings.c:872
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_eddsa_public_key_to_string()

char* GNUNET_CRYPTO_eddsa_public_key_to_string ( const struct GNUNET_CRYPTO_EddsaPublicKey pub)

Convert a public key to a string.

Parameters
pubkey to convert
Returns
string representing pub

Definition at line 235 of file crypto_ecc.c.

References end, GNUNET_free, GNUNET_malloc, and GNUNET_STRINGS_data_to_string().

Referenced by conversation_value_to_string(), create_keys(), GCP_2s(), GNUNET_FRIENDS_write(), GNUNET_HELLO_compose_uri(), GNUNET_i2s(), GNUNET_i2s2(), GNUNET_i2s_full(), main(), print_key(), run(), and uri_loc_to_string().

237 {
238  char *pubkeybuf;
239  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)) * 8;
240  char *end;
241 
242  if (keylen % 5 > 0)
243  keylen += 5 - keylen % 5;
244  keylen /= 5;
245  pubkeybuf = GNUNET_malloc (keylen + 1);
246  end =
247  GNUNET_STRINGS_data_to_string ((unsigned char *) pub,
248  sizeof(struct GNUNET_CRYPTO_EddsaPublicKey),
249  pubkeybuf,
250  keylen);
251  if (NULL == end)
252  {
253  GNUNET_free (pubkeybuf);
254  return NULL;
255  }
256  *end = '\0';
257  return pubkeybuf;
258 }
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
#define GNUNET_malloc(size)
Wrapper around malloc.
char * GNUNET_STRINGS_data_to_string(const void *data, size_t size, char *out, size_t out_size)
Convert binary data to ASCII encoding using CrockfordBase32.
Definition: strings.c:872
#define GNUNET_free(ptr)
Wrapper around free.
Public ECC key (always for curve Ed25519) encoded in a format suitable for network transmission and E...
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◆ GNUNET_CRYPTO_eddsa_private_key_to_string()

char* GNUNET_CRYPTO_eddsa_private_key_to_string ( const struct GNUNET_CRYPTO_EddsaPrivateKey priv)

Convert a private key to a string.

Parameters
privkey to convert
Returns
string representing pub

Definition at line 262 of file crypto_ecc.c.

References end, GNUNET_free, GNUNET_malloc, and GNUNET_STRINGS_data_to_string().

Referenced by run().

264 {
265  char *privkeybuf;
266  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EddsaPrivateKey)) * 8;
267  char *end;
268 
269  if (keylen % 5 > 0)
270  keylen += 5 - keylen % 5;
271  keylen /= 5;
272  privkeybuf = GNUNET_malloc (keylen + 1);
273  end = GNUNET_STRINGS_data_to_string ((unsigned char *) priv,
274  sizeof(
276  privkeybuf,
277  keylen);
278  if (NULL == end)
279  {
280  GNUNET_free (privkeybuf);
281  return NULL;
282  }
283  *end = '\0';
284  return privkeybuf;
285 }
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
Private ECC key encoded for transmission.
#define GNUNET_malloc(size)
Wrapper around malloc.
char * GNUNET_STRINGS_data_to_string(const void *data, size_t size, char *out, size_t out_size)
Convert binary data to ASCII encoding using CrockfordBase32.
Definition: strings.c:872
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_ecdsa_private_key_to_string()

char* GNUNET_CRYPTO_ecdsa_private_key_to_string ( const struct GNUNET_CRYPTO_EcdsaPrivateKey priv)

Convert a private key to a string.

Parameters
privkey to convert
Returns
string representing priv

Definition at line 289 of file crypto_ecc.c.

References end, GNUNET_free, GNUNET_malloc, and GNUNET_STRINGS_data_to_string().

291 {
292  char *privkeybuf;
293  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EcdsaPrivateKey)) * 8;
294  char *end;
295 
296  if (keylen % 5 > 0)
297  keylen += 5 - keylen % 5;
298  keylen /= 5;
299  privkeybuf = GNUNET_malloc (keylen + 1);
300  end = GNUNET_STRINGS_data_to_string ((unsigned char *) priv,
301  sizeof(
303  privkeybuf,
304  keylen);
305  if (NULL == end)
306  {
307  GNUNET_free (privkeybuf);
308  return NULL;
309  }
310  *end = '\0';
311  return privkeybuf;
312 }
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
Private ECC key encoded for transmission.
#define GNUNET_malloc(size)
Wrapper around malloc.
char * GNUNET_STRINGS_data_to_string(const void *data, size_t size, char *out, size_t out_size)
Convert binary data to ASCII encoding using CrockfordBase32.
Definition: strings.c:872
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_CRYPTO_ecdsa_public_key_from_string()

enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdsa_public_key_from_string ( const char *  enc,
size_t  enclen,
struct GNUNET_CRYPTO_EcdsaPublicKey pub 
)

Convert a string representing a public key to a public key.

Parameters
encencoded public key
enclennumber of bytes in enc (without 0-terminator)
pubwhere to store the public key
Returns
GNUNET_OK on success

Definition at line 316 of file crypto_ecc.c.

References GNUNET_OK, GNUNET_STRINGS_string_to_data(), and GNUNET_SYSERR.

Referenced by abd_string_to_value(), access_handler_callback(), GNUNET_ABD_delegate_from_string(), identity_cb(), run(), and sign_cb().

320 {
321  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
322 
323  if (keylen % 5 > 0)
324  keylen += 5 - keylen % 5;
325  keylen /= 5;
326  if (enclen != keylen)
327  return GNUNET_SYSERR;
328 
329  if (GNUNET_OK !=
331  enclen,
332  pub,
333  sizeof(
335  return GNUNET_SYSERR;
336  return GNUNET_OK;
337 }
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
static OpusEncoder * enc
OPUS encoder.
int GNUNET_STRINGS_string_to_data(const char *enc, size_t enclen, void *out, size_t out_size)
Convert CrockfordBase32 encoding back to data.
Definition: strings.c:972
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◆ GNUNET_CRYPTO_eddsa_public_key_from_string()

enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_public_key_from_string ( const char *  enc,
size_t  enclen,
struct GNUNET_CRYPTO_EddsaPublicKey pub 
)

Convert a string representing a public key to a public key.

Parameters
encencoded public key
enclennumber of bytes in enc (without 0-terminator)
pubwhere to store the public key
Returns
GNUNET_OK on success

Definition at line 341 of file crypto_ecc.c.

References GNUNET_OK, GNUNET_STRINGS_string_to_data(), and GNUNET_SYSERR.

Referenced by blacklist_cfg_iter(), conversation_string_to_value(), create_keys(), gns_string_to_value(), GNUNET_FRIENDS_parse(), hosts_directory_scan_callback(), on_identity(), run(), s2i_full(), server_parse_url(), show_peer(), and uri_loc_parse().

345 {
346  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)) * 8;
347 
348  if (keylen % 5 > 0)
349  keylen += 5 - keylen % 5;
350  keylen /= 5;
351  if (enclen != keylen)
352  return GNUNET_SYSERR;
353 
354  if (GNUNET_OK !=
356  enclen,
357  pub,
358  sizeof(
360  return GNUNET_SYSERR;
361  return GNUNET_OK;
362 }
static OpusEncoder * enc
OPUS encoder.
int GNUNET_STRINGS_string_to_data(const char *enc, size_t enclen, void *out, size_t out_size)
Convert CrockfordBase32 encoding back to data.
Definition: strings.c:972
Public ECC key (always for curve Ed25519) encoded in a format suitable for network transmission and E...
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◆ GNUNET_CRYPTO_eddsa_private_key_from_string()

enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_private_key_from_string ( const char *  enc,
size_t  enclen,
struct GNUNET_CRYPTO_EddsaPrivateKey pub 
)

Convert a string representing a private key to a private key.

Parameters
encencoded public key
enclennumber of bytes in enc (without 0-terminator)
privwhere to store the private key
Returns
GNUNET_OK on success

Definition at line 366 of file crypto_ecc.c.

References GNUNET_break, GNUNET_OK, GNUNET_STRINGS_string_to_data(), and GNUNET_SYSERR.

370 {
371  size_t keylen = (sizeof(struct GNUNET_CRYPTO_EddsaPrivateKey)) * 8;
372 
373  if (keylen % 5 > 0)
374  keylen += 5 - keylen % 5;
375  keylen /= 5;
376  if (enclen != keylen)
377  return GNUNET_SYSERR;
378 
379  if (GNUNET_OK !=
381  enclen,
382  priv,
383  sizeof(
385  return GNUNET_SYSERR;
386 #if CRYPTO_BUG
387  if (GNUNET_OK != check_eddsa_key (priv))
388  {
389  GNUNET_break (0);
390  return GNUNET_OK;
391  }
392 #endif
393  return GNUNET_OK;
394 }
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Private ECC key encoded for transmission.
static OpusEncoder * enc
OPUS encoder.
int GNUNET_STRINGS_string_to_data(const char *enc, size_t enclen, void *out, size_t out_size)
Convert CrockfordBase32 encoding back to data.
Definition: strings.c:972
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◆ data_to_ecdsa_value()

static gcry_sexp_t data_to_ecdsa_value ( const struct GNUNET_CRYPTO_EccSignaturePurpose purpose)
static

Convert the data specified in the given purpose argument to an S-expression suitable for signature operations.

Parameters
purposedata to convert
Returns
converted s-expression

Definition at line 492 of file crypto_ecc.c.

References data, GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_ERROR, LOG_GCRY, and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by GNUNET_CRYPTO_ecdsa_sign_(), and GNUNET_CRYPTO_ecdsa_verify_().

493 {
494  gcry_sexp_t data;
495  int rc;
496 
497 /* See #5398 */
498 #if 1
499  struct GNUNET_HashCode hc;
500 
501  GNUNET_CRYPTO_hash (purpose, ntohl (purpose->size), &hc);
502  if (0 != (rc = gcry_sexp_build (&data,
503  NULL,
504  "(data(flags rfc6979)(hash %s %b))",
505  "sha512",
506  (int) sizeof(hc),
507  &hc)))
508  {
509  LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
510  return NULL;
511  }
512 #else
513  if (0 != (rc = gcry_sexp_build (&data,
514  NULL,
515  "(data(flags rfc6979)(hash %s %b))",
516  "sha512",
517  ntohl (purpose->size),
518  purpose)))
519  {
520  LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
521  return NULL;
522  }
523 #endif
524  return data;
525 }
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!)...
A 512-bit hashcode.
#define LOG_GCRY(level, cmd, rc)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
Definition: crypto_ecc.c:58
uint32_t data
The data value.
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◆ derive_h()

static gcry_mpi_t derive_h ( const struct GNUNET_CRYPTO_EcdsaPublicKey pub,
const char *  label,
const char *  context 
)
static

Derive the 'h' value for key derivation, where 'h = H(l,P)'.

Parameters
pubpublic key for deriviation
labellabel for deriviation
contextadditional context to use for HKDF of 'h'; typically the name of the subsystem/application
Returns
h value

Definition at line 708 of file crypto_ecc.c.

References GNUNET_CRYPTO_kdf(), GNUNET_CRYPTO_mpi_scan_unsigned(), h, and salt.

Referenced by GNUNET_CRYPTO_ecdsa_private_key_derive(), and GNUNET_CRYPTO_ecdsa_public_key_derive().

711 {
712  gcry_mpi_t h;
713  struct GNUNET_HashCode hc;
714  static const char *const salt = "key-derivation";
715 
716  GNUNET_CRYPTO_kdf (&hc,
717  sizeof(hc),
718  salt,
719  strlen (salt),
720  pub,
721  sizeof(*pub),
722  label,
723  strlen (label),
724  context,
725  strlen (context),
726  NULL,
727  0);
728  GNUNET_CRYPTO_mpi_scan_unsigned (&h, (unsigned char *) &hc, sizeof(hc));
729  return h;
730 }
static struct GNUNET_ARM_Handle * h
Connection with ARM.
Definition: gnunet-arm.c:99
static pa_context * context
Pulseaudio context.
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_kdf(void *result, size_t out_len, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_kdf.c:90
A 512-bit hashcode.
void GNUNET_CRYPTO_mpi_scan_unsigned(gcry_mpi_t *result, const void *data, size_t size)
Convert data buffer into MPI value.
Definition: crypto_mpi.c:131
static struct GNUNET_CRYPTO_PowSalt salt
Salt for PoW calcualations.
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