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Add ecdsa_write_signature_det()

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This commit is contained in:
Manuel Pégourié-Gonnard 2014-01-06 10:27:16 +01:00
parent f42bca6da0
commit 937340bce0
4 changed files with 126 additions and 12 deletions
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28
include/polarssl/ecdsa.h
View File

@ -137,6 +137,34 @@ int ecdsa_write_signature( ecdsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
#if defined(POLARSSL_ECDSA_DETERMINISTIC)
/**
* \brief Compute ECDSA signature and write it to buffer,
* serialized as defined in RFC 4492 page 20.
* Deterministic version, RFC 6979.
* (Not thread-safe to use same context in multiple threads)
*
* \param ctx ECDSA context
* \param hash Message hash
* \param hlen Length of hash
* \param sig Buffer that will hold the signature
* \param slen Length of the signature written
* \param md_alg MD algorithm used to hash the message
*
* \note The "sig" buffer must be at least as large as twice the
* size of the curve used, plus 7 (eg. 71 bytes if a 256-bit
* curve is used).
*
* \return 0 if successful,
* or a POLARSSL_ERR_ECP, POLARSSL_ERR_MPI or
* POLARSSL_ERR_ASN1 error code
*/
int ecdsa_write_signature_det( ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
unsigned char *sig, size_t *slen,
md_type_t md_alg );
#endif
/**
* \brief Read and verify an ECDSA signature
*

54
library/ecdsa.c
View File

@ -372,25 +372,16 @@ cleanup:
#define MAX_SIG_LEN ( 3 + 2 * ( 2 + POLARSSL_ECP_MAX_BYTES ) )
/*
* Compute and write signature
* Convert a signature (given by context) to ASN.1
*/
int ecdsa_write_signature( ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
unsigned char *sig, size_t *slen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
static int ecdsa_signature_to_asn1( ecdsa_context *ctx,
unsigned char *sig, size_t *slen )
{
int ret;
unsigned char buf[MAX_SIG_LEN];
unsigned char *p = buf + sizeof( buf );
size_t len = 0;
if( ( ret = ecdsa_sign( &ctx->grp, &ctx->r, &ctx->s, &ctx->d,
hash, hlen, f_rng, p_rng ) ) != 0 )
{
return( ret );
}
ASN1_CHK_ADD( len, asn1_write_mpi( &p, buf, &ctx->s ) );
ASN1_CHK_ADD( len, asn1_write_mpi( &p, buf, &ctx->r ) );
@ -404,6 +395,45 @@ int ecdsa_write_signature( ecdsa_context *ctx,
return( 0 );
}
/*
* Compute and write signature
*/
int ecdsa_write_signature( ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
unsigned char *sig, size_t *slen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
if( ( ret = ecdsa_sign( &ctx->grp, &ctx->r, &ctx->s, &ctx->d,
hash, hlen, f_rng, p_rng ) ) != 0 )
{
return( ret );
}
return( ecdsa_signature_to_asn1( ctx, sig, slen ) );
}
/*
* Compute and write signature deterministically
*/
int ecdsa_write_signature_det( ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
unsigned char *sig, size_t *slen,
md_type_t md_alg )
{
int ret;
if( ( ret = ecdsa_sign_det( &ctx->grp, &ctx->r, &ctx->s, &ctx->d,
hash, hlen, md_alg ) ) != 0 )
{
return( ret );
}
return( ecdsa_signature_to_asn1( ctx, sig, slen ) );
}
/*
* Read and check signature
*/

24
tests/suites/test_suite_ecdsa.data
View File

@ -249,3 +249,27 @@ ecdsa_det_test_vectors:POLARSSL_ECP_DP_SECP521R1:"0FAD06DAA62BA3B25D2FB40133DA75
ECDSA deterministic test vector rfc 6979 p521 sha512
depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED:POLARSSL_SHA512_C
ecdsa_det_test_vectors:POLARSSL_ECP_DP_SECP521R1:"0FAD06DAA62BA3B25D2FB40133DA757205DE67F5BB0018FEE8C86E1B68C7E75CAA896EB32F1F47C70855836A6D16FCC1466F6D8FBEC67DB89EC0C08B0E996B83538":POLARSSL_MD_SHA512:"test":"13E99020ABF5CEE7525D16B69B229652AB6BDF2AFFCAEF38773B4B7D08725F10CDB93482FDCC54EDCEE91ECA4166B2A7C6265EF0CE2BD7051B7CEF945BABD47EE6D":"1FBD0013C674AA79CB39849527916CE301C66EA7CE8B80682786AD60F98F7E78A19CA69EFF5C57400E3B3A0AD66CE0978214D13BAF4E9AC60752F7B155E2DE4DCE3"
ECDSA deterministic read-write random p256 sha256
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED:POLARSSL_SHA256_C
ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP256R1:POLARSSL_MD_SHA256
ECDSA deterministic read-write random p256 sha384
depends_on:POLARSSL_ECP_DP_SECP256R1_ENABLED:POLARSSL_SHA512_C
ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP256R1:POLARSSL_MD_SHA384
ECDSA deterministic read-write random p384 sha256
depends_on:POLARSSL_ECP_DP_SECP384R1_ENABLED:POLARSSL_SHA256_C
ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP384R1:POLARSSL_MD_SHA256
ECDSA deterministic read-write random p384 sha384
depends_on:POLARSSL_ECP_DP_SECP384R1_ENABLED:POLARSSL_SHA512_C
ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP384R1:POLARSSL_MD_SHA384
ECDSA deterministic read-write random p521 sha256
depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED:POLARSSL_SHA256_C
ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP521R1:POLARSSL_MD_SHA256
ECDSA deterministic read-write random p521 sha384
depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED:POLARSSL_SHA512_C
ecdsa_write_read_det_random:POLARSSL_ECP_DP_SECP521R1:POLARSSL_MD_SHA384

32
tests/suites/test_suite_ecdsa.function
View File

@ -186,3 +186,35 @@ void ecdsa_write_read_random( int id )
ecdsa_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void ecdsa_write_read_det_random( int id, int md_alg )
{
ecdsa_context ctx;
rnd_pseudo_info rnd_info;
unsigned char msg[100];
unsigned char hash[POLARSSL_MD_MAX_SIZE];
unsigned char sig[200];
size_t sig_len;
ecdsa_init( &ctx );
memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
memset( hash, 0, sizeof( hash ) );
memset( sig, 0x2a, sizeof( sig ) );
/* prepare material for signature */
TEST_ASSERT( rnd_pseudo_rand( &rnd_info, msg, sizeof( msg ) ) == 0 );
md( md_info_from_type( md_alg ), msg, sizeof( msg ), hash );
/* generate signing key */
TEST_ASSERT( ecdsa_genkey( &ctx, id, &rnd_pseudo_rand, &rnd_info ) == 0 );
/* generate and write signature, then read and verify it */
TEST_ASSERT( ecdsa_write_signature_det( &ctx, hash, sizeof( hash ),
sig, &sig_len, md_alg ) == 0 );
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len ) == 0 );
ecdsa_free( &ctx );
}
/* END_CASE */