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This commit is contained in:
Philippe Teuwen 2019-03-10 00:00:59 +01:00
commit 0373696662
483 changed files with 56514 additions and 52451 deletions
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317
common/mbedtls/ecdsa.c
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@ -48,23 +48,23 @@
* Derive a suitable integer for group grp from a buffer of length len
* SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3
*/
static int derive_mpi( const mbedtls_ecp_group *grp, mbedtls_mpi *x,
const unsigned char *buf, size_t blen )
static int derive_mpi(const mbedtls_ecp_group *grp, mbedtls_mpi *x,
const unsigned char *buf, size_t blen)
{
int ret;
size_t n_size = ( grp->nbits + 7 ) / 8;
size_t n_size = (grp->nbits + 7) / 8;
size_t use_size = blen > n_size ? n_size : blen;
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( x, buf, use_size ) );
if( use_size * 8 > grp->nbits )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( x, use_size * 8 - grp->nbits ) );
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(x, buf, use_size));
if (use_size * 8 > grp->nbits)
MBEDTLS_MPI_CHK(mbedtls_mpi_shift_r(x, use_size * 8 - grp->nbits));
/* While at it, reduce modulo N */
if( mbedtls_mpi_cmp_mpi( x, &grp->N ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( x, x, &grp->N ) );
if (mbedtls_mpi_cmp_mpi(x, &grp->N) >= 0)
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_mpi(x, x, &grp->N));
cleanup:
return( ret );
return (ret);
}
#if !defined(MBEDTLS_ECDSA_SIGN_ALT)
@ -72,93 +72,89 @@ cleanup:
* Compute ECDSA signature of a hashed message (SEC1 4.1.3)
* Obviously, compared to SEC1 4.1.3, we skip step 4 (hash message)
*/
int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
int mbedtls_ecdsa_sign(mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
int ret, key_tries, sign_tries, blind_tries;
mbedtls_ecp_point R;
mbedtls_mpi k, e, t;
/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
if( grp->N.p == NULL )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
if (grp->N.p == NULL)
return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
/* Make sure d is in range 1..n-1 */
if( mbedtls_mpi_cmp_int( d, 1 ) < 0 || mbedtls_mpi_cmp_mpi( d, &grp->N ) >= 0 )
return( MBEDTLS_ERR_ECP_INVALID_KEY );
if (mbedtls_mpi_cmp_int(d, 1) < 0 || mbedtls_mpi_cmp_mpi(d, &grp->N) >= 0)
return (MBEDTLS_ERR_ECP_INVALID_KEY);
mbedtls_ecp_point_init( &R );
mbedtls_mpi_init( &k ); mbedtls_mpi_init( &e ); mbedtls_mpi_init( &t );
mbedtls_ecp_point_init(&R);
mbedtls_mpi_init(&k);
mbedtls_mpi_init(&e);
mbedtls_mpi_init(&t);
sign_tries = 0;
do
{
do {
/*
* Steps 1-3: generate a suitable ephemeral keypair
* and set r = xR mod n
*/
key_tries = 0;
do
{
MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair( grp, &k, &R, f_rng, p_rng ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( r, &R.X, &grp->N ) );
do {
MBEDTLS_MPI_CHK(mbedtls_ecp_gen_keypair(grp, &k, &R, f_rng, p_rng));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(r, &R.X, &grp->N));
if( key_tries++ > 10 )
{
if (key_tries++ > 10) {
ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
goto cleanup;
}
}
while( mbedtls_mpi_cmp_int( r, 0 ) == 0 );
} while (mbedtls_mpi_cmp_int(r, 0) == 0);
/*
* Step 5: derive MPI from hashed message
*/
MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) );
MBEDTLS_MPI_CHK(derive_mpi(grp, &e, buf, blen));
/*
* Generate a random value to blind inv_mod in next step,
* avoiding a potential timing leak.
*/
blind_tries = 0;
do
{
size_t n_size = ( grp->nbits + 7 ) / 8;
MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &t, n_size, f_rng, p_rng ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &t, 8 * n_size - grp->nbits ) );
do {
size_t n_size = (grp->nbits + 7) / 8;
MBEDTLS_MPI_CHK(mbedtls_mpi_fill_random(&t, n_size, f_rng, p_rng));
MBEDTLS_MPI_CHK(mbedtls_mpi_shift_r(&t, 8 * n_size - grp->nbits));
/* See mbedtls_ecp_gen_keypair() */
if( ++blind_tries > 30 )
return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
}
while( mbedtls_mpi_cmp_int( &t, 1 ) < 0 ||
mbedtls_mpi_cmp_mpi( &t, &grp->N ) >= 0 );
if (++blind_tries > 30)
return (MBEDTLS_ERR_ECP_RANDOM_FAILED);
} while (mbedtls_mpi_cmp_int(&t, 1) < 0 ||
mbedtls_mpi_cmp_mpi(&t, &grp->N) >= 0);
/*
* Step 6: compute s = (e + r * d) / k = t (e + rd) / (kt) mod n
*/
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, r, d ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &e, &e, s ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &e, &e, &t ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &k, &k, &t ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( s, &k, &grp->N ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, s, &e ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( s, s, &grp->N ) );
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(s, r, d));
MBEDTLS_MPI_CHK(mbedtls_mpi_add_mpi(&e, &e, s));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&e, &e, &t));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&k, &k, &t));
MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(s, &k, &grp->N));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(s, s, &e));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(s, s, &grp->N));
if( sign_tries++ > 10 )
{
if (sign_tries++ > 10) {
ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
goto cleanup;
}
}
while( mbedtls_mpi_cmp_int( s, 0 ) == 0 );
} while (mbedtls_mpi_cmp_int(s, 0) == 0);
cleanup:
mbedtls_ecp_point_free( &R );
mbedtls_mpi_free( &k ); mbedtls_mpi_free( &e ); mbedtls_mpi_free( &t );
mbedtls_ecp_point_free(&R);
mbedtls_mpi_free(&k);
mbedtls_mpi_free(&e);
mbedtls_mpi_free(&t);
return( ret );
return (ret);
}
#endif /* MBEDTLS_ECDSA_SIGN_ALT */
@ -166,37 +162,37 @@ cleanup:
/*
* Deterministic signature wrapper
*/
int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
mbedtls_md_type_t md_alg )
int mbedtls_ecdsa_sign_det(mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
mbedtls_md_type_t md_alg)
{
int ret;
mbedtls_hmac_drbg_context rng_ctx;
unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES];
size_t grp_len = ( grp->nbits + 7 ) / 8;
size_t grp_len = (grp->nbits + 7) / 8;
const mbedtls_md_info_t *md_info;
mbedtls_mpi h;
if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
if ((md_info = mbedtls_md_info_from_type(md_alg)) == NULL)
return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
mbedtls_mpi_init( &h );
mbedtls_hmac_drbg_init( &rng_ctx );
mbedtls_mpi_init(&h);
mbedtls_hmac_drbg_init(&rng_ctx);
/* Use private key and message hash (reduced) to initialize HMAC_DRBG */
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( d, data, grp_len ) );
MBEDTLS_MPI_CHK( derive_mpi( grp, &h, buf, blen ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, data + grp_len, grp_len ) );
mbedtls_hmac_drbg_seed_buf( &rng_ctx, md_info, data, 2 * grp_len );
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(d, data, grp_len));
MBEDTLS_MPI_CHK(derive_mpi(grp, &h, buf, blen));
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&h, data + grp_len, grp_len));
mbedtls_hmac_drbg_seed_buf(&rng_ctx, md_info, data, 2 * grp_len);
ret = mbedtls_ecdsa_sign( grp, r, s, d, buf, blen,
mbedtls_hmac_drbg_random, &rng_ctx );
ret = mbedtls_ecdsa_sign(grp, r, s, d, buf, blen,
mbedtls_hmac_drbg_random, &rng_ctx);
cleanup:
mbedtls_hmac_drbg_free( &rng_ctx );
mbedtls_mpi_free( &h );
mbedtls_hmac_drbg_free(&rng_ctx);
mbedtls_mpi_free(&h);
return( ret );
return (ret);
}
#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
@ -205,27 +201,29 @@ cleanup:
* Verify ECDSA signature of hashed message (SEC1 4.1.4)
* Obviously, compared to SEC1 4.1.3, we skip step 2 (hash message)
*/
int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
const unsigned char *buf, size_t blen,
const mbedtls_ecp_point *Q, const mbedtls_mpi *r, const mbedtls_mpi *s)
int mbedtls_ecdsa_verify(mbedtls_ecp_group *grp,
const unsigned char *buf, size_t blen,
const mbedtls_ecp_point *Q, const mbedtls_mpi *r, const mbedtls_mpi *s)
{
int ret;
mbedtls_mpi e, s_inv, u1, u2;
mbedtls_ecp_point R;
mbedtls_ecp_point_init( &R );
mbedtls_mpi_init( &e ); mbedtls_mpi_init( &s_inv ); mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 );
mbedtls_ecp_point_init(&R);
mbedtls_mpi_init(&e);
mbedtls_mpi_init(&s_inv);
mbedtls_mpi_init(&u1);
mbedtls_mpi_init(&u2);
/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
if( grp->N.p == NULL )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
if (grp->N.p == NULL)
return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
/*
* Step 1: make sure r and s are in range 1..n-1
*/
if( mbedtls_mpi_cmp_int( r, 1 ) < 0 || mbedtls_mpi_cmp_mpi( r, &grp->N ) >= 0 ||
mbedtls_mpi_cmp_int( s, 1 ) < 0 || mbedtls_mpi_cmp_mpi( s, &grp->N ) >= 0 )
{
if (mbedtls_mpi_cmp_int(r, 1) < 0 || mbedtls_mpi_cmp_mpi(r, &grp->N) >= 0 ||
mbedtls_mpi_cmp_int(s, 1) < 0 || mbedtls_mpi_cmp_mpi(s, &grp->N) >= 0) {
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
goto cleanup;
}
@ -233,23 +231,23 @@ int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
/*
* Additional precaution: make sure Q is valid
*/
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, Q ) );
MBEDTLS_MPI_CHK(mbedtls_ecp_check_pubkey(grp, Q));
/*
* Step 3: derive MPI from hashed message
*/
MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) );
MBEDTLS_MPI_CHK(derive_mpi(grp, &e, buf, blen));
/*
* Step 4: u1 = e / s mod n, u2 = r / s mod n
*/
MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &s_inv, s, &grp->N ) );
MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(&s_inv, s, &grp->N));
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u1, &e, &s_inv ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u1, &u1, &grp->N ) );
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&u1, &e, &s_inv));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&u1, &u1, &grp->N));
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u2, r, &s_inv ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u2, &u2, &grp->N ) );
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&u2, r, &s_inv));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&u2, &u2, &grp->N));
/*
* Step 5: R = u1 G + u2 Q
@ -257,10 +255,9 @@ int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
* Since we're not using any secret data, no need to pass a RNG to
* mbedtls_ecp_mul() for countermesures.
*/
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, &R, &u1, &grp->G, &u2, Q ) );
MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(grp, &R, &u1, &grp->G, &u2, Q));
if( mbedtls_ecp_is_zero( &R ) )
{
if (mbedtls_ecp_is_zero(&R)) {
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
goto cleanup;
}
@ -269,104 +266,106 @@ int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
* Step 6: convert xR to an integer (no-op)
* Step 7: reduce xR mod n (gives v)
*/
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &R.X, &R.X, &grp->N ) );
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&R.X, &R.X, &grp->N));
/*
* Step 8: check if v (that is, R.X) is equal to r
*/
if( mbedtls_mpi_cmp_mpi( &R.X, r ) != 0 )
{
if (mbedtls_mpi_cmp_mpi(&R.X, r) != 0) {
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
goto cleanup;
}
cleanup:
mbedtls_ecp_point_free( &R );
mbedtls_mpi_free( &e ); mbedtls_mpi_free( &s_inv ); mbedtls_mpi_free( &u1 ); mbedtls_mpi_free( &u2 );
mbedtls_ecp_point_free(&R);
mbedtls_mpi_free(&e);
mbedtls_mpi_free(&s_inv);
mbedtls_mpi_free(&u1);
mbedtls_mpi_free(&u2);
return( ret );
return (ret);
}
#endif /* MBEDTLS_ECDSA_VERIFY_ALT */
/*
* Convert a signature (given by context) to ASN.1
*/
static int ecdsa_signature_to_asn1( const mbedtls_mpi *r, const mbedtls_mpi *s,
unsigned char *sig, size_t *slen )
static int ecdsa_signature_to_asn1(const mbedtls_mpi *r, const mbedtls_mpi *s,
unsigned char *sig, size_t *slen)
{
int ret;
unsigned char buf[MBEDTLS_ECDSA_MAX_LEN];
unsigned char *p = buf + sizeof( buf );
unsigned char *p = buf + sizeof(buf);
size_t len = 0;
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, s ) );
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, r ) );
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&p, buf, s));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&p, buf, r));
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, buf, len ) );
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, buf,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&p, buf, len));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&p, buf,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE));
memcpy( sig, p, len );
memcpy(sig, p, len);
*slen = len;
return( 0 );
return (0);
}
/*
* Compute and write signature
*/
int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg,
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 mbedtls_ecdsa_write_signature(mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg,
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;
mbedtls_mpi r, s;
mbedtls_mpi_init( &r );
mbedtls_mpi_init( &s );
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&s);
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
(void) f_rng;
(void) p_rng;
MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det( &ctx->grp, &r, &s, &ctx->d,
hash, hlen, md_alg ) );
MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign_det(&ctx->grp, &r, &s, &ctx->d,
hash, hlen, md_alg));
#else
(void) md_alg;
MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ctx->grp, &r, &s, &ctx->d,
hash, hlen, f_rng, p_rng ) );
MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&ctx->grp, &r, &s, &ctx->d,
hash, hlen, f_rng, p_rng));
#endif
MBEDTLS_MPI_CHK( ecdsa_signature_to_asn1( &r, &s, sig, slen ) );
MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, slen));
cleanup:
mbedtls_mpi_free( &r );
mbedtls_mpi_free( &s );
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&s);
return( ret );
return (ret);
}
#if ! defined(MBEDTLS_DEPRECATED_REMOVED) && \
defined(MBEDTLS_ECDSA_DETERMINISTIC)
int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
unsigned char *sig, size_t *slen,
mbedtls_md_type_t md_alg )
int mbedtls_ecdsa_write_signature_det(mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
unsigned char *sig, size_t *slen,
mbedtls_md_type_t md_alg)
{
return( mbedtls_ecdsa_write_signature( ctx, md_alg, hash, hlen, sig, slen,
NULL, NULL ) );
return (mbedtls_ecdsa_write_signature(ctx, md_alg, hash, hlen, sig, slen,
NULL, NULL));
}
#endif
/*
* Read and check signature
*/
int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
const unsigned char *sig, size_t slen )
int mbedtls_ecdsa_read_signature(mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
const unsigned char *sig, size_t slen)
{
int ret;
unsigned char *p = (unsigned char *) sig;
@ -374,90 +373,86 @@ int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
size_t len;
mbedtls_mpi r, s;
mbedtls_mpi_init( &r );
mbedtls_mpi_init( &s );
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&s);
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( p + len != end )
{
if (p + len != end) {
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
goto cleanup;
}
if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
{
if ((ret = mbedtls_asn1_get_mpi(&p, end, &r)) != 0 ||
(ret = mbedtls_asn1_get_mpi(&p, end, &s)) != 0) {
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen,
&ctx->Q, &r, &s ) ) != 0 )
if ((ret = mbedtls_ecdsa_verify(&ctx->grp, hash, hlen,
&ctx->Q, &r, &s)) != 0)
goto cleanup;
/* At this point we know that the buffer starts with a valid signature.
* Return 0 if the buffer just contains the signature, and a specific
* error code if the valid signature is followed by more data. */
if( p != end )
if (p != end)
ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
cleanup:
mbedtls_mpi_free( &r );
mbedtls_mpi_free( &s );
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&s);
return( ret );
return (ret);
}
#if !defined(MBEDTLS_ECDSA_GENKEY_ALT)
/*
* Generate key pair
*/
int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
int mbedtls_ecdsa_genkey(mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
return( mbedtls_ecp_group_load( &ctx->grp, gid ) ||
mbedtls_ecp_gen_keypair( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) );
return (mbedtls_ecp_group_load(&ctx->grp, gid) ||
mbedtls_ecp_gen_keypair(&ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng));
}
#endif /* MBEDTLS_ECDSA_GENKEY_ALT */
/*
* Set context from an mbedtls_ecp_keypair
*/
int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key )
int mbedtls_ecdsa_from_keypair(mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key)
{
int ret;
if( ( ret = mbedtls_ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 ||
( ret = mbedtls_mpi_copy( &ctx->d, &key->d ) ) != 0 ||
( ret = mbedtls_ecp_copy( &ctx->Q, &key->Q ) ) != 0 )
{
mbedtls_ecdsa_free( ctx );
if ((ret = mbedtls_ecp_group_copy(&ctx->grp, &key->grp)) != 0 ||
(ret = mbedtls_mpi_copy(&ctx->d, &key->d)) != 0 ||
(ret = mbedtls_ecp_copy(&ctx->Q, &key->Q)) != 0) {
mbedtls_ecdsa_free(ctx);
}
return( ret );
return (ret);
}
/*
* Initialize context
*/
void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx )
void mbedtls_ecdsa_init(mbedtls_ecdsa_context *ctx)
{
mbedtls_ecp_keypair_init( ctx );
mbedtls_ecp_keypair_init(ctx);
}
/*
* Free context
*/
void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx )
void mbedtls_ecdsa_free(mbedtls_ecdsa_context *ctx)
{
mbedtls_ecp_keypair_free( ctx );
mbedtls_ecp_keypair_free(ctx);
}
#endif /* MBEDTLS_ECDSA_C */