RSA: Use hashlen as the hash input size as documented
Where hashlen was previously ignored when the hash length could be
inferred from an md_alg parameter, the two must now match.
Adapt the existing tests accordingly. Adapt the sample programs accordingly.
This commit does not add any negative testing.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/rsa.c b/library/rsa.c
index a788337..57b8a6f 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -1799,7 +1799,8 @@
if( md_info == NULL )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
- hashlen = mbedtls_md_get_size( md_info );
+ if( hashlen != mbedtls_md_get_size( md_info ) )
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
}
md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
@@ -1934,14 +1935,13 @@
* Parameters:
* - md_alg: Identifies the hash algorithm used to generate the given hash;
* MBEDTLS_MD_NONE if raw data is signed.
- * - hashlen: Length of hash in case hashlen is MBEDTLS_MD_NONE.
+ * - hashlen: Length of hash. Must match md_alg if that's not NONE.
* - hash: Buffer containing the hashed message or the raw data.
* - dst_len: Length of the encoded message.
* - dst: Buffer to hold the encoded message.
*
* Assumptions:
- * - hash has size hashlen if md_alg == MBEDTLS_MD_NONE.
- * - hash has size corresponding to md_alg if md_alg != MBEDTLS_MD_NONE.
+ * - hash has size hashlen.
* - dst points to a buffer of size at least dst_len.
*
*/
@@ -1966,7 +1966,8 @@
if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
- hashlen = mbedtls_md_get_size( md_info );
+ if( hashlen != mbedtls_md_get_size( md_info ) )
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
/* Double-check that 8 + hashlen + oid_size can be used as a
* 1-byte ASN.1 length encoding and that there's no overflow. */
@@ -2031,6 +2032,8 @@
* TAG-NULL + LEN [ NULL ] ]
* TAG-OCTET + LEN [ HASH ] ]
*/
+ if( 0x08 + oid_size + hashlen >= 0x80 )
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
*p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
*p++ = (unsigned char)( 0x08 + oid_size + hashlen );
*p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
@@ -2212,7 +2215,8 @@
if( md_info == NULL )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
- hashlen = mbedtls_md_get_size( md_info );
+ if( hashlen != mbedtls_md_get_size( md_info ) )
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
}
md_info = mbedtls_md_info_from_type( mgf1_hash_id );
@@ -2683,7 +2687,7 @@
}
if( mbedtls_rsa_pkcs1_sign( &rsa, myrand, NULL,
- MBEDTLS_MD_SHA1, 0,
+ MBEDTLS_MD_SHA1, 20,
sha1sum, rsa_ciphertext ) != 0 )
{
if( verbose != 0 )
@@ -2696,7 +2700,7 @@
if( verbose != 0 )
mbedtls_printf( "passed\n PKCS#1 sig. verify: " );
- if( mbedtls_rsa_pkcs1_verify( &rsa, MBEDTLS_MD_SHA1, 0,
+ if( mbedtls_rsa_pkcs1_verify( &rsa, MBEDTLS_MD_SHA1, 20,
sha1sum, rsa_ciphertext ) != 0 )
{
if( verbose != 0 )
diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
index d68dc24..88e817e 100644
--- a/programs/pkey/dh_client.c
+++ b/programs/pkey/dh_client.c
@@ -221,7 +221,7 @@
}
if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, MBEDTLS_MD_SHA256,
- 0, hash, p ) ) != 0 )
+ 32, hash, p ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_verify returned %d\n\n", ret );
goto exit;
diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
index 9d51c14..e469bbc 100644
--- a/programs/pkey/dh_server.c
+++ b/programs/pkey/dh_server.c
@@ -229,7 +229,7 @@
buf[n + 1] = (unsigned char)( rsa.MBEDTLS_PRIVATE(len) );
if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_MD_SHA256,
- 0, hash, buf + n + 2 ) ) != 0 )
+ 32, hash, buf + n + 2 ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned %d\n\n", ret );
goto exit;
diff --git a/programs/pkey/rsa_sign.c b/programs/pkey/rsa_sign.c
index d9ba3bb..ebc88e4 100644
--- a/programs/pkey/rsa_sign.c
+++ b/programs/pkey/rsa_sign.c
@@ -147,7 +147,7 @@
}
if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_MD_SHA256,
- 20, hash, buf ) ) != 0 )
+ 32, hash, buf ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n", (unsigned int) -ret );
goto exit;
diff --git a/programs/pkey/rsa_verify.c b/programs/pkey/rsa_verify.c
index fff568a..5a68246 100644
--- a/programs/pkey/rsa_verify.c
+++ b/programs/pkey/rsa_verify.c
@@ -141,7 +141,7 @@
}
if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, MBEDTLS_MD_SHA256,
- 20, hash, buf ) ) != 0 )
+ 32, hash, buf ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\n", (unsigned int) -ret );
goto exit;
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 573c9d4..c7c5f50 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -444,9 +444,10 @@
if( digest != MBEDTLS_MD_NONE )
{
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ),
- message_str->x, message_str->len, hash_result ) == 0 );
- hash_len = 0;
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len,
+ hash_result ) == 0 );
+ hash_len = mbedtls_md_get_size( md_info );
}
else
{
@@ -611,7 +612,8 @@
{
mbedtls_pk_context pk;
size_t sig_len;
- unsigned char hash[MBEDTLS_MD_MAX_SIZE];
+ unsigned char hash[32]; // Hard-coded for SHA256
+ size_t hash_len = sizeof( hash );
unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
void *rs_ctx = NULL;
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
@@ -635,7 +637,7 @@
TEST_ASSERT( pk_genkey( &pk, parameter ) == 0 );
TEST_ASSERT( mbedtls_pk_sign_restartable( &pk, MBEDTLS_MD_SHA256,
- hash, sizeof hash, sig, &sig_len,
+ hash, hash_len, sig, &sig_len,
mbedtls_test_rnd_std_rand, NULL, rs_ctx ) == sign_ret );
if( sign_ret == 0 )
TEST_ASSERT( sig_len <= MBEDTLS_PK_SIGNATURE_MAX_SIZE );
@@ -643,22 +645,22 @@
sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE;
TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
- hash, sizeof hash, sig, sig_len ) == verify_ret );
+ hash, hash_len, sig, sig_len ) == verify_ret );
if( verify_ret == 0 )
{
hash[0]++;
TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
- hash, sizeof hash, sig, sig_len ) != 0 );
+ hash, hash_len, sig, sig_len ) != 0 );
hash[0]--;
sig[0]++;
TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
- hash, sizeof hash, sig, sig_len ) != 0 );
+ hash, hash_len, sig, sig_len ) != 0 );
sig[0]--;
}
- TEST_ASSERT( mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, sizeof hash,
+ TEST_ASSERT( mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, hash_len,
sig, &sig_len,
mbedtls_test_rnd_std_rand,
NULL ) == sign_ret );
@@ -668,7 +670,7 @@
sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE;
TEST_ASSERT( mbedtls_pk_verify_restartable( &pk, MBEDTLS_MD_SHA256,
- hash, sizeof hash, sig, sig_len, rs_ctx ) == verify_ret );
+ hash, hash_len, sig, sig_len, rs_ctx ) == verify_ret );
if( verify_ret == 0 )
{
diff --git a/tests/suites/test_suite_pkcs1_v15.function b/tests/suites/test_suite_pkcs1_v15.function
index d78ee88..3d29f10 100644
--- a/tests/suites/test_suite_pkcs1_v15.function
+++ b/tests/suites/test_suite_pkcs1_v15.function
@@ -269,6 +269,7 @@
data_t * result_str, int result )
{
unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
unsigned char output[128];
mbedtls_rsa_context ctx;
mbedtls_mpi N, P, Q, E;
@@ -298,13 +299,13 @@
TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );
+ if( md_info != NULL )
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len, hash_result ) == 0 );
- if( mbedtls_md_info_from_type( digest ) != NULL )
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str->x, message_str->len, hash_result ) == 0 );
-
- TEST_ASSERT( mbedtls_rsa_pkcs1_sign( &ctx, &mbedtls_test_rnd_buffer_rand,
- &info, digest, 0, hash_result,
- output ) == result );
+ TEST_ASSERT( mbedtls_rsa_pkcs1_sign(
+ &ctx, &mbedtls_test_rnd_buffer_rand, &info,
+ digest, mbedtls_md_get_size( md_info ), hash_result,
+ output ) == result );
if( result == 0 )
{
@@ -326,6 +327,7 @@
data_t * result_str, int result )
{
unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
mbedtls_rsa_context ctx;
mbedtls_mpi N, E;
((void) salt);
@@ -343,10 +345,10 @@
TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );
- if( mbedtls_md_info_from_type( digest ) != NULL )
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str->x, message_str->len, hash_result ) == 0 );
+ if( md_info != NULL )
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len, hash_result ) == 0 );
- TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, 0, hash_result, result_str->x ) == result );
+ TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, mbedtls_md_get_size( md_info ), hash_result, result_str->x ) == result );
exit:
mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
diff --git a/tests/suites/test_suite_pkcs1_v21.function b/tests/suites/test_suite_pkcs1_v21.function
index ec5591f..27b0990 100644
--- a/tests/suites/test_suite_pkcs1_v21.function
+++ b/tests/suites/test_suite_pkcs1_v21.function
@@ -123,6 +123,7 @@
int result )
{
unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
unsigned char output[512];
mbedtls_rsa_context ctx;
mbedtls_test_rnd_buf_info info;
@@ -152,14 +153,15 @@
TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );
- if( mbedtls_md_info_from_type( digest ) != NULL )
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str->x, message_str->len, hash_result ) == 0 );
+ if( md_info != NULL )
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len, hash_result ) == 0 );
if (fixed_salt_length == MBEDTLS_RSA_SALT_LEN_ANY)
{
- TEST_ASSERT( mbedtls_rsa_pkcs1_sign( &ctx, &mbedtls_test_rnd_buffer_rand,
- &info, digest, 0,hash_result,
- output ) == result );
+ TEST_ASSERT( mbedtls_rsa_pkcs1_sign(
+ &ctx, &mbedtls_test_rnd_buffer_rand, &info,
+ digest, mbedtls_md_get_size( md_info ), hash_result,
+ output ) == result );
if( result == 0 )
{
ASSERT_COMPARE( output, ctx.len, result_str->x, result_str->len );
@@ -169,9 +171,10 @@
info.length = rnd_buf->len;
}
- TEST_ASSERT( mbedtls_rsa_rsassa_pss_sign_ext( &ctx, &mbedtls_test_rnd_buffer_rand,
- &info, digest, 0, hash_result,
- fixed_salt_length, output ) == result );
+ TEST_ASSERT( mbedtls_rsa_rsassa_pss_sign_ext(
+ &ctx, &mbedtls_test_rnd_buffer_rand, &info,
+ digest, mbedtls_md_get_size( md_info ), hash_result,
+ fixed_salt_length, output ) == result );
if( result == 0 )
{
ASSERT_COMPARE( output, ctx.len, result_str->x, result_str->len );
@@ -190,6 +193,7 @@
char * salt, data_t * result_str, int result )
{
unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
mbedtls_rsa_context ctx;
mbedtls_mpi N, E;
((void) salt);
@@ -208,10 +212,10 @@
TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );
- if( mbedtls_md_info_from_type( digest ) != NULL )
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str->x, message_str->len, hash_result ) == 0 );
+ if( md_info != NULL )
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len, hash_result ) == 0 );
- TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, 0, hash_result, result_str->x ) == result );
+ TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, mbedtls_md_get_size( md_info ), hash_result, result_str->x ) == result );
exit:
mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
@@ -248,9 +252,12 @@
if( msg_digest_id != MBEDTLS_MD_NONE )
{
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( msg_digest_id ),
- message_str->x, message_str->len, hash_result ) == 0 );
- hash_len = 0;
+ const mbedtls_md_info_t *md_info =
+ mbedtls_md_info_from_type( msg_digest_id );
+ TEST_ASSERT( mbedtls_md( md_info,
+ message_str->x, message_str->len,
+ hash_result ) == 0 );
+ hash_len = mbedtls_md_get_size( md_info );
}
else
{
diff --git a/tests/suites/test_suite_rsa.function b/tests/suites/test_suite_rsa.function
index 14b4afc..1bffc76 100644
--- a/tests/suites/test_suite_rsa.function
+++ b/tests/suites/test_suite_rsa.function
@@ -86,6 +86,7 @@
data_t * result_str, int result )
{
unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
unsigned char output[256];
mbedtls_rsa_context ctx;
mbedtls_mpi N, P, Q, E;
@@ -111,13 +112,13 @@
TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );
+ if( md_info != NULL )
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len, hash_result ) == 0 );
- if( mbedtls_md_info_from_type( digest ) != NULL )
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str->x, message_str->len, hash_result ) == 0 );
-
- TEST_ASSERT( mbedtls_rsa_pkcs1_sign( &ctx, &mbedtls_test_rnd_pseudo_rand,
- &rnd_info, digest, 0, hash_result,
- output ) == result );
+ TEST_ASSERT( mbedtls_rsa_pkcs1_sign(
+ &ctx, &mbedtls_test_rnd_pseudo_rand, &rnd_info,
+ digest, mbedtls_md_get_size( md_info ), hash_result,
+ output ) == result );
if( result == 0 )
{
@@ -139,8 +140,8 @@
data_t * result_str, int result )
{
unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( digest );
mbedtls_rsa_context ctx;
-
mbedtls_mpi N, E;
mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
@@ -155,11 +156,10 @@
TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );
+ if( md_info != NULL )
+ TEST_ASSERT( mbedtls_md( md_info, message_str->x, message_str->len, hash_result ) == 0 );
- if( mbedtls_md_info_from_type( digest ) != NULL )
- TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str->x, message_str->len, hash_result ) == 0 );
-
- TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, 0, hash_result, result_str->x ) == result );
+ TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, mbedtls_md_get_size( md_info ), hash_result, result_str->x ) == result );
exit:
mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
