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Simplify ecdsa_context

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-03-31 13:06:41 +02:00
parent 49ce6f0973
commit 8fce937a1a
3 changed files with 48 additions and 42 deletions
library
ecdsa.c

77
library/ecdsa.c
View file

@ -284,7 +284,7 @@ cleanup:
/*
* Convert a signature (given by context) to ASN.1
*/
static int ecdsa_signature_to_asn1( ecdsa_context *ctx,
static int ecdsa_signature_to_asn1( const mpi *r, const mpi *s,
unsigned char *sig, size_t *slen )
{
int ret;
@ -292,8 +292,8 @@ static int ecdsa_signature_to_asn1( ecdsa_context *ctx,
unsigned char *p = buf + sizeof( buf );
size_t len = 0;
ASN1_CHK_ADD( len, asn1_write_mpi( &p, buf, &ctx->s ) );
ASN1_CHK_ADD( len, asn1_write_mpi( &p, buf, &ctx->r ) );
ASN1_CHK_ADD( len, asn1_write_mpi( &p, buf, s ) );
ASN1_CHK_ADD( len, asn1_write_mpi( &p, buf, r ) );
ASN1_CHK_ADD( len, asn1_write_len( &p, buf, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( &p, buf,
@ -315,23 +315,31 @@ int ecdsa_write_signature( ecdsa_context *ctx, md_type_t md_alg,
void *p_rng )
{
int ret;
mpi r, s;
mpi_init( &r );
mpi_init( &s );
#if defined(POLARSSL_ECDSA_DETERMINISTIC)
(void) f_rng;
(void) p_rng;
ret = ecdsa_sign_det( &ctx->grp, &ctx->r, &ctx->s, &ctx->d,
hash, hlen, md_alg );
MPI_CHK( ecdsa_sign_det( &ctx->grp, &r, &s, &ctx->d,
hash, hlen, md_alg ) );
#else
(void) md_alg;
ret = ecdsa_sign( &ctx->grp, &ctx->r, &ctx->s, &ctx->d,
hash, hlen, f_rng, p_rng );
MPI_CHK( ecdsa_sign( &ctx->grp, &r, &s, &ctx->d,
hash, hlen, f_rng, p_rng ) );
#endif
if( ret != 0 )
return( ret );
return( ecdsa_signature_to_asn1( ctx, sig, slen ) );
MPI_CHK( ecdsa_signature_to_asn1( &r, &s, sig, slen ) );
cleanup:
mpi_free( &r );
mpi_free( &s );
return( ret );
}
#if ! defined(POLARSSL_DEPRECATED_REMOVED)
@ -340,7 +348,7 @@ int ecdsa_write_signature_det( ecdsa_context *ctx,
unsigned char *sig, size_t *slen,
md_type_t md_alg )
{
return( ecdsa_write_signature( ctx, md_ald, hash, hlen, sig, siglen,
return( ecdsa_write_signature( ctx, md_alg, hash, hlen, sig, slen,
NULL, NULL ) );
}
#endif
@ -356,29 +364,44 @@ int ecdsa_read_signature( ecdsa_context *ctx,
unsigned char *p = (unsigned char *) sig;
const unsigned char *end = sig + slen;
size_t len;
mpi r, s;
mpi_init( &r );
mpi_init( &s );
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA + ret );
ret += POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( p + len != end )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
{
ret = POLARSSL_ERR_ECP_BAD_INPUT_DATA +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH;
goto cleanup;
}
if( ( ret = asn1_get_mpi( &p, end, &ctx->r ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &ctx->s ) ) != 0 )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA + ret );
if( ( ret = asn1_get_mpi( &p, end, &r ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &s ) ) != 0 )
{
ret += POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( ( ret = ecdsa_verify( &ctx->grp, hash, hlen,
&ctx->Q, &ctx->r, &ctx->s ) ) != 0 )
return( ret );
&ctx->Q, &r, &s ) ) != 0 )
goto cleanup;
if( p != end )
return( POLARSSL_ERR_ECP_SIG_LEN_MISMATCH );
ret = POLARSSL_ERR_ECP_SIG_LEN_MISMATCH;
return( 0 );
cleanup:
mpi_free( &r );
mpi_free( &s );
return( ret );
}
/*
@ -413,11 +436,7 @@ int ecdsa_from_keypair( ecdsa_context *ctx, const ecp_keypair *key )
*/
void ecdsa_init( ecdsa_context *ctx )
{
ecp_group_init( &ctx->grp );
mpi_init( &ctx->d );
ecp_point_init( &ctx->Q );
mpi_init( &ctx->r );
mpi_init( &ctx->s );
ecp_keypair_init( ctx );
}
/*
@ -425,11 +444,7 @@ void ecdsa_init( ecdsa_context *ctx )
*/
void ecdsa_free( ecdsa_context *ctx )
{
ecp_group_free( &ctx->grp );
mpi_free( &ctx->d );
ecp_point_free( &ctx->Q );
mpi_free( &ctx->r );
mpi_free( &ctx->s );
ecp_keypair_free( ctx );
}
#endif /* POLARSSL_ECDSA_C */