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Add test for restartable signature

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Test relies on deterministic signature as this uses plain sig internally, so
if deterministic works, then so does non-deterministic, while the reciprocal
is false. (Also, deterministic is enabled by default in config.h.)

Test case is taken from a RFC 6979 test vector, just manually converting (r,s)
to the encoded signature.
This commit is contained in:
Manuel Pégourié-Gonnard 2017-04-25 10:57:30 +02:00
parent addb10efac
commit eb402f3cd3
2 changed files with 61 additions and 0 deletions
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57
tests/suites/test_suite_ecdsa.function
View file

@ -264,3 +264,60 @@ exit:
mbedtls_ecdsa_restart_free( &rs_ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE:MBEDTLS_ECDSA_DETERMINISTIC */
void ecdsa_write_restart( int id, char *d_str, int md_alg,
char *msg, char *sig_str,
int max_ops, int min_restart, int max_restart )
{
int ret, cnt_restart;
mbedtls_ecdsa_restart_ctx rs_ctx;
mbedtls_ecdsa_context ctx;
unsigned char hash[MBEDTLS_MD_MAX_SIZE];
unsigned char sig[MBEDTLS_ECDSA_MAX_LEN];
unsigned char sig_check[MBEDTLS_ECDSA_MAX_LEN];
size_t hlen, slen, slen_check;
const mbedtls_md_info_t *md_info;
mbedtls_ecdsa_restart_init( &rs_ctx );
mbedtls_ecdsa_init( &ctx );
memset( hash, 0, sizeof( hash ) );
memset( sig, 0, sizeof( sig ) );
memset( sig_check, 0, sizeof( sig_check ) );
TEST_ASSERT( mbedtls_ecp_group_load( &ctx.grp, id ) == 0 );
TEST_ASSERT( mbedtls_mpi_read_string( &ctx.d, 16, d_str ) == 0 );
slen_check = unhexify( sig_check, sig_str );
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
hlen = mbedtls_md_get_size( md_info );
mbedtls_md( md_info, (const unsigned char *) msg, strlen( msg ), hash );
mbedtls_ecp_set_max_ops( max_ops );
slen = sizeof( sig );
cnt_restart = 0;
do {
ret = mbedtls_ecdsa_write_signature_restartable( &ctx,
md_alg, hash, hlen, sig, &slen, NULL, NULL, &rs_ctx );
} while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( slen == slen_check );
TEST_ASSERT( memcmp( sig, sig_check, slen ) == 0 );
TEST_ASSERT( cnt_restart >= min_restart );
TEST_ASSERT( cnt_restart <= max_restart );
/* do we leak memory when aborting? */
ret = mbedtls_ecdsa_write_signature_restartable( &ctx,
md_alg, hash, hlen, sig, &slen, NULL, NULL, &rs_ctx );
TEST_ASSERT( ret == 0 || ret == MBEDTLS_ERR_ECP_IN_PROGRESS );
exit:
mbedtls_ecdsa_restart_free( &rs_ctx );
mbedtls_ecdsa_free( &ctx );
}
/* END_CASE */