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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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54
library/ecdsa.c
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@ -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
*/