crypto_ecc.c File Reference

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

#include "platform.h"
#include <gcrypt.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...
static gcry_sexp_t	decode_private_eddsa_key (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv)
	Convert the given private key from the network format to the S-expression that can be used by libgcrypt. More...
static gcry_sexp_t	decode_private_ecdhe_key (const struct GNUNET_CRYPTO_EcdhePrivateKey *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...
int	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...
int	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...
int	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...
struct GNUNET_CRYPTO_EcdhePrivateKey *	GNUNET_CRYPTO_ecdhe_key_create ()
	Create a new private key. More...
int	GNUNET_CRYPTO_ecdhe_key_create2 (struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
	Create a new private key. More...
struct GNUNET_CRYPTO_EcdsaPrivateKey *	GNUNET_CRYPTO_ecdsa_key_create ()
	Create a new private key. More...
struct GNUNET_CRYPTO_EddsaPrivateKey *	GNUNET_CRYPTO_eddsa_key_create ()
	Create a new private key. More...
const struct GNUNET_CRYPTO_EcdsaPrivateKey *	GNUNET_CRYPTO_ecdsa_key_get_anonymous ()
	Get the shared private key we use for anonymous users. More...
static gcry_sexp_t	data_to_eddsa_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...
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...
int	GNUNET_CRYPTO_ecdsa_sign (const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EcdsaSignature *sig)
	Sign a given block. More...
int	GNUNET_CRYPTO_eddsa_sign (const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
	Sign a given block. More...
int	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 signature. More...
int	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 signature. More...
int	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 ECDHE 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_EcdsaPrivateKey *	GNUNET_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...
static void	reverse_buffer (unsigned char *buffer, size_t length)
	Reverse the sequence of the bytes in buffer. More...
static gcry_mpi_t	eddsa_d_to_a (gcry_mpi_t d)
	Convert the secret d of an EdDSA key to the value that is actually used in the EdDSA computation. More...
static int	point_to_hash (gcry_mpi_point_t result, gcry_ctx_t ctx, struct GNUNET_HashCode *key_material)
	Take point from ECDH and convert it to key material. More...
int	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...
int	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...
int	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...
int	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

Definition in file crypto_ecc.c.

Macro Definition Documentation

EXTRA_CHECKS

#define EXTRA_CHECKS   0

Definition at line 32 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 40 of file crypto_ecc.c.

Referenced by decode_private_ecdhe_key(), decode_private_ecdsa_key(), decode_private_eddsa_key(), GNUNET_CRYPTO_ecc_ecdh(), GNUNET_CRYPTO_ecdh_eddsa(), GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdsa_ecdh(), GNUNET_CRYPTO_ecdsa_key_create(), GNUNET_CRYPTO_ecdsa_private_key_derive(), GNUNET_CRYPTO_ecdsa_public_key_derive(), GNUNET_CRYPTO_ecdsa_verify(), GNUNET_CRYPTO_eddsa_ecdh(), GNUNET_CRYPTO_eddsa_key_create(), and GNUNET_CRYPTO_eddsa_verify().

LOG

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

Definition at line 42 of file crypto_ecc.c.

Referenced by GNUNET_CRYPTO_ecdsa_sign(), GNUNET_CRYPTO_ecdsa_verify(), GNUNET_CRYPTO_eddsa_sign(), and GNUNET_CRYPTO_eddsa_verify().

LOG_STRERROR

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

Definition at line 44 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 47 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)

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 55 of file crypto_ecc.c.

Referenced by data_to_ecdsa_value(), data_to_eddsa_value(), decode_private_ecdhe_key(), decode_private_ecdsa_key(), decode_private_eddsa_key(), GNUNET_CRYPTO_ecc_ecdh(), GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdsa_key_create(), GNUNET_CRYPTO_ecdsa_verify(), GNUNET_CRYPTO_eddsa_key_create(), GNUNET_CRYPTO_eddsa_verify(), and point_to_hash().

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

array	where to store the result(s)
sexp	S-expression to parse
topname	top-level name in the S-expression that is of interest
elems	names of the elements to extract

Returns

0 on success

Definition at line 77 of file crypto_ecc.c.

References list.

Referenced by GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdsa_key_create(), GNUNET_CRYPTO_ecdsa_sign(), GNUNET_CRYPTO_eddsa_key_create(), and GNUNET_CRYPTO_eddsa_sign().

{
  gcry_sexp_t list;
  gcry_sexp_t l2;
  const char *s;
  unsigned int i;
  unsigned int idx;

  list = gcry_sexp_find_token (sexp, topname, 0);
  if (! list)
    return 1;
  l2 = gcry_sexp_cadr (list);
  gcry_sexp_release (list);
  list = l2;
  if (! list)
    return 2;

  idx = 0;
  for (s = elems; *s; s++, idx++)
  {
    l2 = gcry_sexp_find_token (list, s, 1);
    if (! l2)
    {
      for (i = 0; i < idx; i++)
      {
        gcry_free (array[i]);
        array[i] = NULL;
      }
      gcry_sexp_release (list);
      return 3; /* required parameter not found */
    }
    array[idx] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG);
    gcry_sexp_release (l2);
    if (! array[idx])
    {
      for (i = 0; i < idx; i++)
      {
        gcry_free (array[i]);
        array[i] = NULL;
      }
      gcry_sexp_release (list);
      return 4; /* required parameter is invalid */
    }
  }
  gcry_sexp_release (list);
  return 0;
}

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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

priv	private key to decode

Returns

NULL on error

Definition at line 137 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_key_get_public(), and GNUNET_CRYPTO_ecdsa_sign().

{
  gcry_sexp_t result;
  int rc;

  rc = gcry_sexp_build (&result,
                        NULL,
                        "(private-key(ecc(curve \"" CURVE "\")"
                        "(d %b)))",
                        (int) sizeof (priv->d),
                        priv->d);
  if (0 != rc)
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    GNUNET_assert (0);
  }
#if EXTRA_CHECKS
  if (0 != (rc = gcry_pk_testkey (result)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_pk_testkey", rc);
    GNUNET_assert (0);
  }
#endif
  return result;
}

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decode_private_eddsa_key()

static gcry_sexp_t decode_private_eddsa_key ( const struct GNUNET_CRYPTO_EddsaPrivateKey *  priv )

static

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

Parameters

priv	private key to decode

Returns

NULL on error

Definition at line 172 of file crypto_ecc.c.

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

Referenced by GNUNET_CRYPTO_eddsa_key_get_public(), and GNUNET_CRYPTO_eddsa_sign().

{
  gcry_sexp_t result;
  int rc;

  rc = gcry_sexp_build (&result,
                        NULL,
                        "(private-key(ecc(curve \"" CURVE "\")"
                        "(flags eddsa)(d %b)))",
                        (int) sizeof (priv->d),
                        priv->d);
  if (0 != rc)
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    GNUNET_assert (0);
  }
#if EXTRA_CHECKS
  if (0 != (rc = gcry_pk_testkey (result)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_pk_testkey", rc);
    GNUNET_assert (0);
  }
#endif
  return result;
}

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decode_private_ecdhe_key()

static gcry_sexp_t decode_private_ecdhe_key ( const struct GNUNET_CRYPTO_EcdhePrivateKey *  priv )

static

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

Parameters

priv	private key to decode

Returns

NULL on error

Definition at line 207 of file crypto_ecc.c.

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

Referenced by GNUNET_CRYPTO_ecdhe_key_get_public().

{
  gcry_sexp_t result;
  int rc;

  rc = gcry_sexp_build (&result,
                        NULL,
                        "(private-key(ecc(curve \"" CURVE "\")"
                        "(d %b)))",
                        (int) sizeof (priv->d),
                        priv->d);
  if (0 != rc)
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    GNUNET_assert (0);
  }
#if EXTRA_CHECKS
  if (0 != (rc = gcry_pk_testkey (result)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_pk_testkey", rc);
    GNUNET_assert (0);
  }
#endif
  return result;
}

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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

pub	key to convert

Returns

string representing pub

Definition at line 334 of file crypto_ecc.c.

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

Referenced by attribute_delegation_to_json(), create_finished(), credential_to_json(), credential_value_to_string(), ego_get_for_subsystem(), get_ego(), gns_value_to_string(), GNUNET_CREDENTIAL_credential_to_string(), GNUNET_GNSRECORD_pkey_to_zkey(), handle_collect_response(), handle_verify_response(), handle_verify_result(), id_connect_cb(), init_egos(), list_ego(), print_ego(), and send_cred_response().

{
  char *pubkeybuf;
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
  char *end;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  pubkeybuf = GNUNET_malloc (keylen + 1);
  end =
    GNUNET_STRINGS_data_to_string ((unsigned char *) pub,
                                   sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
                                   pubkeybuf,
                                   keylen);
  if (NULL == end)
  {
    GNUNET_free (pubkeybuf);
    return NULL;
  }
  *end = '\0';
  return pubkeybuf;
}

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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

pub	key to convert

Returns

string representing pub

Definition at line 367 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().

{
  char *pubkeybuf;
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)) * 8;
  char *end;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  pubkeybuf = GNUNET_malloc (keylen + 1);
  end =
    GNUNET_STRINGS_data_to_string ((unsigned char *) pub,
                                   sizeof (struct GNUNET_CRYPTO_EddsaPublicKey),
                                   pubkeybuf,
                                   keylen);
  if (NULL == end)
  {
    GNUNET_free (pubkeybuf);
    return NULL;
  }
  *end = '\0';
  return pubkeybuf;
}

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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

priv	key to convert

Returns

string representing pub

Definition at line 400 of file crypto_ecc.c.

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

Referenced by run().

{
  char *privkeybuf;
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EddsaPrivateKey)) * 8;
  char *end;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  privkeybuf = GNUNET_malloc (keylen + 1);
  end = GNUNET_STRINGS_data_to_string ((unsigned char *) priv,
                                       sizeof (
                                         struct GNUNET_CRYPTO_EddsaPrivateKey),
                                       privkeybuf,
                                       keylen);
  if (NULL == end)
  {
    GNUNET_free (privkeybuf);
    return NULL;
  }
  *end = '\0';
  return privkeybuf;
}

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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

priv	key to convert

Returns

string representing priv

Definition at line 433 of file crypto_ecc.c.

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

Referenced by create_finished(), and print_ego().

{
  char *privkeybuf;
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EcdsaPrivateKey)) * 8;
  char *end;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  privkeybuf = GNUNET_malloc (keylen + 1);
  end = GNUNET_STRINGS_data_to_string ((unsigned char *) priv,
                                       sizeof (
                                         struct GNUNET_CRYPTO_EcdsaPrivateKey),
                                       privkeybuf,
                                       keylen);
  if (NULL == end)
  {
    GNUNET_free (privkeybuf);
    return NULL;
  }
  *end = '\0';
  return privkeybuf;
}

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GNUNET_CRYPTO_ecdsa_public_key_from_string()

int 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

enc	encoded public key
enclen	number of bytes in enc (without 0-terminator)
pub	where to store the public key

Returns

GNUNET_OK on success

Definition at line 468 of file crypto_ecc.c.

References GNUNET_OK, GNUNET_STRINGS_string_to_data(), and GNUNET_SYSERR.

Referenced by access_handler_callback(), authorize_endpoint(), code_redirect(), collect_cred_cont(), create_response(), credential_string_to_value(), get_cred_issuer_cb(), gns_string_to_value(), GNUNET_CREDENTIAL_credential_from_string(), GNUNET_GNS_lookup_with_tld(), GNUNET_GNSRECORD_zkey_to_pkey(), identity_cb(), json_to_credential(), lookup_it_finished(), run(), run_with_zone_pkey(), start_process(), tld_iter(), and verify_cred_cont().

{
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  if (enclen != keylen)
    return GNUNET_SYSERR;

  if (GNUNET_OK !=
      GNUNET_STRINGS_string_to_data (enc,
                                     enclen,
                                     pub,
                                     sizeof (
                                       struct GNUNET_CRYPTO_EcdsaPublicKey)))
    return GNUNET_SYSERR;
  return GNUNET_OK;
}

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GNUNET_CRYPTO_eddsa_public_key_from_string()

int 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

enc	encoded public key
enclen	number of bytes in enc (without 0-terminator)
pub	where to store the public key

Returns

GNUNET_OK on success

Definition at line 501 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(), run(), s2i_full(), server_parse_url(), show_peer(), and uri_loc_parse().

{
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)) * 8;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  if (enclen != keylen)
    return GNUNET_SYSERR;

  if (GNUNET_OK !=
      GNUNET_STRINGS_string_to_data (enc,
                                     enclen,
                                     pub,
                                     sizeof (
                                       struct GNUNET_CRYPTO_EddsaPublicKey)))
    return GNUNET_SYSERR;
  return GNUNET_OK;
}

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GNUNET_CRYPTO_eddsa_private_key_from_string()

int 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.

Parameters

enc	encoded public key
enclen	number of bytes in enc (without 0-terminator)
priv	where to store the private key

Returns

GNUNET_OK on success

Definition at line 534 of file crypto_ecc.c.

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

{
  size_t keylen = (sizeof (struct GNUNET_CRYPTO_EddsaPrivateKey)) * 8;

  if (keylen % 5 > 0)
    keylen += 5 - keylen % 5;
  keylen /= 5;
  if (enclen != keylen)
    return GNUNET_SYSERR;

  if (GNUNET_OK !=
      GNUNET_STRINGS_string_to_data (enc,
                                     enclen,
                                     priv,
                                     sizeof (
                                       struct GNUNET_CRYPTO_EddsaPrivateKey)))
    return GNUNET_SYSERR;
#if CRYPTO_BUG
  if (GNUNET_OK != check_eddsa_key (priv))
  {
    GNUNET_break (0);
    return GNUNET_OK;
  }
#endif
  return GNUNET_OK;
}

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data_to_eddsa_value()

static gcry_sexp_t data_to_eddsa_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

purpose

data to convert

Returns

converted s-expression

Definition at line 841 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_eddsa_sign(), and GNUNET_CRYPTO_eddsa_verify().

{
  gcry_sexp_t data;
  int rc;

/* SEE #5398 */
#if 1
  struct GNUNET_HashCode hc;

  GNUNET_CRYPTO_hash (purpose, ntohl (purpose->size), &hc);
  if (0 != (rc = gcry_sexp_build (&data,
                                  NULL,
                                  "(data(flags eddsa)(hash-algo %s)(value %b))",
                                  "sha512",
                                  (int) sizeof (hc),
                                  &hc)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    return NULL;
  }
#else
  GNUNET_CRYPTO_hash (purpose, ntohl (purpose->size), &hc);
  if (0 != (rc = gcry_sexp_build (&data,
                                  NULL,
                                  "(data(flags eddsa)(hash-algo %s)(value %b))",
                                  "sha512",
                                  ntohl (purpose->size),
                                  purpose)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    return NULL;
  }
#endif
  return data;
}

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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

purpose

data to convert

Returns

converted s-expression

Definition at line 886 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().

{
  gcry_sexp_t data;
  int rc;

/* See #5398 */
#if 1
  struct GNUNET_HashCode hc;

  GNUNET_CRYPTO_hash (purpose, ntohl (purpose->size), &hc);
  if (0 != (rc = gcry_sexp_build (&data,
                                  NULL,
                                  "(data(flags rfc6979)(hash %s %b))",
                                  "sha512",
                                  (int) sizeof (hc),
                                  &hc)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    return NULL;
  }
#else
  if (0 != (rc = gcry_sexp_build (&data,
                                  NULL,
                                  "(data(flags rfc6979)(hash %s %b))",
                                  "sha512",
                                  ntohl (purpose->size),
                                  purpose)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_sexp_build", rc);
    return NULL;
  }
#endif
  return data;
}

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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

pub	public key for deriviation
label	label for deriviation
context	additional context to use for HKDF of 'h'; typically the name of the subsystem/application

Returns

h value

Definition at line 1257 of file crypto_ecc.c.

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

Referenced by GNUNET_CRYPTO_ecdsa_private_key_derive(), and GNUNET_CRYPTO_ecdsa_public_key_derive().

{
  gcry_mpi_t h;
  struct GNUNET_HashCode hc;
  static const char *const salt = "key-derivation";

  GNUNET_CRYPTO_kdf (&hc,
                     sizeof (hc),
                     salt,
                     strlen (salt),
                     pub,
                     sizeof (*pub),
                     label,
                     strlen (label),
                     context,
                     strlen (context),
                     NULL,
                     0);
  GNUNET_CRYPTO_mpi_scan_unsigned (&h, (unsigned char *) &hc, sizeof (hc));
  return h;
}

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reverse_buffer()

static void reverse_buffer ( unsigned char *  buffer, size_t  length  )

static

Reverse the sequence of the bytes in buffer.

Parameters

Definition at line 1396 of file crypto_ecc.c.

Referenced by eddsa_d_to_a().

{
  unsigned char tmp;
  size_t i;

  for (i = 0; i < length / 2; i++)
  {
    tmp = buffer[i];
    buffer[i] = buffer[length - 1 - i];
    buffer[length - 1 - i] = tmp;
  }
}

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eddsa_d_to_a()

static gcry_mpi_t eddsa_d_to_a ( gcry_mpi_t  d )

static

Convert the secret d of an EdDSA key to the value that is actually used in the EdDSA computation.

Parameters

d	secret input

Returns

value used for the calculation in EdDSA

Definition at line 1418 of file crypto_ecc.c.

References GNUNET_assert, GNUNET_CRYPTO_mpi_scan_unsigned(), and reverse_buffer().

Referenced by GNUNET_CRYPTO_eddsa_ecdh().

{
  unsigned char rawmpi[32]; /* 256-bit value */
  size_t rawmpilen;
  unsigned char digest[64]; /* 512-bit hash value */
  gcry_buffer_t hvec[2];
  unsigned int b;
  gcry_mpi_t a;

  b = 256 / 8; /* number of bytes in `d` */

  /* Note that we clear DIGEST so we can use it as input to left pad
     the key with zeroes for hashing.  */
  memset (digest, 0, sizeof digest);
  memset (hvec, 0, sizeof hvec);
  rawmpilen = sizeof (rawmpi);
  GNUNET_assert (
    0 == gcry_mpi_print (GCRYMPI_FMT_USG, rawmpi, rawmpilen, &rawmpilen, d));
  hvec[0].data = digest;
  hvec[0].off = 0;
  hvec[0].len = b > rawmpilen ? (b - rawmpilen) : 0;
  hvec[1].data = rawmpi;
  hvec[1].off = 0;
  hvec[1].len = rawmpilen;
  GNUNET_assert (
    0 == gcry_md_hash_buffers (GCRY_MD_SHA512, 0 /* flags */, digest, hvec, 2));
  /* Compute the A value.  */
  reverse_buffer (digest, 32); /* Only the first half of the hash.  */
  digest[0] = (digest[0] & 0x7f) | 0x40;
  digest[31] &= 0xf8;

  GNUNET_CRYPTO_mpi_scan_unsigned (&a, digest, 32);
  return a;
}

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point_to_hash()

static int point_to_hash ( gcry_mpi_point_t  result, gcry_ctx_t  ctx, struct GNUNET_HashCode *  key_material  )

static

Take point from ECDH and convert it to key material.

Parameters

result	point from ECDH
ctx	ECC context
key_material[out]	set to derived key material

Returns

GNUNET_OK on success

Definition at line 1463 of file crypto_ecc.c.

References GNUNET_assert, GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_ERROR, GNUNET_OK, GNUNET_SYSERR, and LOG_GCRY.

Referenced by GNUNET_CRYPTO_ecdh_eddsa(), GNUNET_CRYPTO_ecdsa_ecdh(), and GNUNET_CRYPTO_eddsa_ecdh().

{
  gcry_mpi_t result_x;
  unsigned char xbuf[256 / 8];
  size_t rsize;

  /* finally, convert point to string for hashing */
  result_x = gcry_mpi_new (256);
  if (gcry_mpi_ec_get_affine (result_x, NULL, result, ctx))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "get_affine failed", 0);
    return GNUNET_SYSERR;
  }

  rsize = sizeof (xbuf);
  GNUNET_assert (! gcry_mpi_get_flag (result_x, GCRYMPI_FLAG_OPAQUE));
  /* result_x can be negative here, so we do not use 'GNUNET_CRYPTO_mpi_print_unsigned'
     as that does not include the sign bit; x should be a 255-bit
     value, so with the sign it should fit snugly into the 256-bit
     xbuf */
  GNUNET_assert (
    0 == gcry_mpi_print (GCRYMPI_FMT_STD, xbuf, rsize, &rsize, result_x));
  GNUNET_CRYPTO_hash (xbuf, rsize, key_material);
  gcry_mpi_release (result_x);
  return GNUNET_OK;
}

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