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Test cipher_auth_{en,de}crypt_ext()

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-11-30 10:17:01 +01:00
parent 89a8fe50fe
commit 53f10e70fd
1 changed files with 157 additions and 11 deletions
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168
tests/suites/test_suite_cipher.function
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@ -1013,9 +1013,15 @@ void auth_crypt_tv( int cipher_id, data_t * key, data_t * iv,
* of AEAD decryption and AEAD encryption. Check that
* this results in the expected plaintext, and that
* decryption and encryption are inverse to one another.
*
* Do that twice:
* - once with legacy functions auth_decrypt/auth_encrypt
* - once with new functions auth_decrypt_ext/auth_encrypt_ext
* This allows testing both without duplicating test cases.
*/
int ret;
int using_nist_kw, using_nist_kw_padding;
unsigned char output[300]; /* Temporary buffer for results of
* encryption and decryption. */
unsigned char *output_tag = NULL; /* Temporary buffer for tag in the
@ -1027,6 +1033,13 @@ void auth_crypt_tv( int cipher_id, data_t * key, data_t * iv,
unsigned char *tmp_tag = NULL;
unsigned char *tmp_cipher = NULL;
unsigned char *cipher_plus_tag = NULL;
size_t cipher_plus_tag_len;
unsigned char *decrypt_buf = NULL;
size_t decrypt_buf_len = 0;
unsigned char *encrypt_buf = NULL;
size_t encrypt_buf_len = 0;
mbedtls_cipher_init( &ctx );
memset( output, 0xFF, sizeof( output ) );
@ -1038,6 +1051,17 @@ void auth_crypt_tv( int cipher_id, data_t * key, data_t * iv,
(void) use_psa;
#endif
/*
* Are we using NIST_KW? with padding?
*/
using_nist_kw_padding = cipher_id == MBEDTLS_CIPHER_AES_128_KWP ||
cipher_id == MBEDTLS_CIPHER_AES_192_KWP ||
cipher_id == MBEDTLS_CIPHER_AES_256_KWP;
using_nist_kw = cipher_id == MBEDTLS_CIPHER_AES_128_KW ||
cipher_id == MBEDTLS_CIPHER_AES_192_KW ||
cipher_id == MBEDTLS_CIPHER_AES_256_KW ||
using_nist_kw_padding;
/*
* Prepare context for decryption
*/
@ -1045,24 +1069,146 @@ void auth_crypt_tv( int cipher_id, data_t * key, data_t * iv,
MBEDTLS_DECRYPT );
/*
* Prepare buffers/pointers for decryption
* prepare buffer for decryption
* (we need the tag appended to the ciphertext)
*/
cipher_plus_tag_len = cipher->len + tag->len;
ASSERT_ALLOC( cipher_plus_tag, cipher_plus_tag_len );
memcpy( cipher_plus_tag, cipher->x, cipher->len );
memcpy( cipher_plus_tag + cipher->len, tag->x, tag->len );
/*
* Compute length of output buffer according to the documentation
*/
if( using_nist_kw )
decrypt_buf_len = cipher_plus_tag_len - 8;
else
decrypt_buf_len = cipher_plus_tag_len - tag->len;
/*
* Try decrypting to a buffer that's 1B too small
*/
if( decrypt_buf_len != 0 )
{
ASSERT_ALLOC( decrypt_buf, decrypt_buf_len - 1 );
outlen = 0;
ret = mbedtls_cipher_auth_decrypt_ext( &ctx, iv->x, iv->len,
ad->x, ad->len, cipher_plus_tag, cipher_plus_tag_len,
decrypt_buf, decrypt_buf_len - 1, &outlen, tag->len );
TEST_ASSERT( ret == MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
mbedtls_free( decrypt_buf );
decrypt_buf = NULL;
}
/*
* Authenticate and decrypt, and check result
*/
ASSERT_ALLOC( decrypt_buf, decrypt_buf_len );
outlen = 0;
ret = mbedtls_cipher_auth_decrypt_ext( &ctx, iv->x, iv->len,
ad->x, ad->len, cipher_plus_tag, cipher_plus_tag_len,
decrypt_buf, decrypt_buf_len, &outlen, tag->len );
if( strcmp( result, "FAIL" ) == 0 )
{
TEST_ASSERT( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED );
}
else
{
TEST_ASSERT( ret == 0 );
TEST_ASSERT( outlen == clear->len );
if( clear->len != 0 )
TEST_ASSERT( memcmp( decrypt_buf, clear->x, clear->len ) == 0 );
}
/* Free this, but keep cipher_plus_tag for legacy function with PSA */
mbedtls_free( decrypt_buf );
decrypt_buf = NULL;
/*
* Encrypt back if test data was authentic
*/
if( strcmp( result, "FAIL" ) != 0 )
{
/* prepare context for encryption */
cipher_reset_key( &ctx, cipher_id, use_psa, tag->len, key,
MBEDTLS_ENCRYPT );
/*
* Compute size of output buffer according to documentation
*/
if( using_nist_kw )
{
encrypt_buf_len = clear->len + 8;
if( using_nist_kw_padding && encrypt_buf_len % 8 != 0 )
encrypt_buf_len += 8 - encrypt_buf_len % 8;
}
else
{
encrypt_buf_len = clear->len + tag->len;
}
/*
* Try encrypting with an output buffer that's 1B too small
*/
ASSERT_ALLOC( encrypt_buf, encrypt_buf_len - 1 );
outlen = 0;
ret = mbedtls_cipher_auth_encrypt_ext( &ctx, iv->x, iv->len,
ad->x, ad->len, clear->x, clear->len,
encrypt_buf, encrypt_buf_len - 1, &outlen, tag->len );
TEST_ASSERT( ret != 0 );
mbedtls_free( encrypt_buf );
encrypt_buf = NULL;
/*
* Encrypt and check the result
*/
ASSERT_ALLOC( encrypt_buf, encrypt_buf_len );
outlen = 0;
ret = mbedtls_cipher_auth_encrypt_ext( &ctx, iv->x, iv->len,
ad->x, ad->len, clear->x, clear->len,
encrypt_buf, encrypt_buf_len, &outlen, tag->len );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( outlen == cipher->len + tag->len );
TEST_ASSERT( memcmp( encrypt_buf, cipher->x, cipher->len ) == 0 );
TEST_ASSERT( memcmp( encrypt_buf + cipher->len,
tag->x, tag->len ) == 0 );
mbedtls_free( encrypt_buf );
encrypt_buf = NULL;
}
/*
* Prepare context for decryption
*/
cipher_reset_key( &ctx, cipher_id, use_psa, tag->len, key,
MBEDTLS_DECRYPT );
/*
* Prepare pointers for decryption
*/
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( use_psa == 1 )
{
/* PSA requires that the tag immediately follows the ciphertext. */
tmp_cipher = mbedtls_calloc( 1, cipher->len + tag->len );
TEST_ASSERT( tmp_cipher != NULL );
/* PSA requires that the tag immediately follows the ciphertext.
* Fortunately, we already have that from testing the new API. */
tmp_cipher = cipher_plus_tag;
tmp_tag = tmp_cipher + cipher->len;
memcpy( tmp_cipher, cipher->x, cipher->len );
memcpy( tmp_tag, tag->x, tag->len );
}
else
#endif /* MBEDTLS_USE_PSA_CRYPTO */
{
tmp_tag = tag->x;
tmp_cipher = cipher->x;
tmp_tag = tag->x;
}
/*
@ -1118,13 +1264,13 @@ void auth_crypt_tv( int cipher_id, data_t * key, data_t * iv,
exit:
mbedtls_cipher_free( &ctx );
mbedtls_free( decrypt_buf );
mbedtls_free( encrypt_buf );
mbedtls_free( cipher_plus_tag );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( use_psa == 1 )
{
mbedtls_free( tmp_cipher );
PSA_DONE( );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
}
/* END_CASE */