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Fix AES-OFB support for errors, tests and self-test

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Adds error handling into mbedtls_aes_crypt_ofb for AES errors, a self-test
for the OFB mode using NIST SP 800-38A test vectors and adds a check to
potential return errors in setting the AES encryption key in the OFB test
suite.
This commit is contained in:
Simon Butcher 2018-04-29 00:43:47 +01:00
parent 7487c5b2c8
commit ad4e4938d1
3 changed files with 139 additions and 5 deletions
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140
library/aes.c
View file

@ -1074,13 +1074,17 @@ int mbedtls_aes_crypt_ofb( mbedtls_aes_context *ctx,
const unsigned char *input,
unsigned char *output )
{
int ret = 0;
size_t n = *iv_off;
while( length-- )
{
if( n == 0 )
mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
{
ret = mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
if( ret != 0 )
goto exit;
}
*output++ = *input++ ^ iv[n];
n = ( n + 1 ) & 0x0F;
@ -1088,7 +1092,8 @@ int mbedtls_aes_crypt_ofb( mbedtls_aes_context *ctx,
*iv_off = n;
return( 0 );
exit:
return( ret );
}
#endif /* MBEDTLS_CIPHER_MODE_OFB */
@ -1247,6 +1252,72 @@ static const unsigned char aes_test_cfb128_ct[3][64] =
};
#endif /* MBEDTLS_CIPHER_MODE_CFB */
#if defined(MBEDTLS_CIPHER_MODE_OFB)
/*
* AES-OFB test vectors from:
*
* http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
*/
static const unsigned char aes_test_ofb_key[3][32] =
{
{ 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6,
0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C },
{ 0x8E, 0x73, 0xB0, 0xF7, 0xDA, 0x0E, 0x64, 0x52,
0xC8, 0x10, 0xF3, 0x2B, 0x80, 0x90, 0x79, 0xE5,
0x62, 0xF8, 0xEA, 0xD2, 0x52, 0x2C, 0x6B, 0x7B },
{ 0x60, 0x3D, 0xEB, 0x10, 0x15, 0xCA, 0x71, 0xBE,
0x2B, 0x73, 0xAE, 0xF0, 0x85, 0x7D, 0x77, 0x81,
0x1F, 0x35, 0x2C, 0x07, 0x3B, 0x61, 0x08, 0xD7,
0x2D, 0x98, 0x10, 0xA3, 0x09, 0x14, 0xDF, 0xF4 }
};
static const unsigned char aes_test_ofb_iv[16] =
{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F
};
static const unsigned char aes_test_ofb_pt[64] =
{
0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96,
0xE9, 0x3D, 0x7E, 0x11, 0x73, 0x93, 0x17, 0x2A,
0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03, 0xAC, 0x9C,
0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51,
0x30, 0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11,
0xE5, 0xFB, 0xC1, 0x19, 0x1A, 0x0A, 0x52, 0xEF,
0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B, 0x17,
0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10
};
static const unsigned char aes_test_ofb_ct[3][64] =
{
{ 0x3B, 0x3F, 0xD9, 0x2E, 0xB7, 0x2D, 0xAD, 0x20,
0x33, 0x34, 0x49, 0xF8, 0xE8, 0x3C, 0xFB, 0x4A,
0x77, 0x89, 0x50, 0x8d, 0x16, 0x91, 0x8f, 0x03,
0xf5, 0x3c, 0x52, 0xda, 0xc5, 0x4e, 0xd8, 0x25,
0x97, 0x40, 0x05, 0x1e, 0x9c, 0x5f, 0xec, 0xf6,
0x43, 0x44, 0xf7, 0xa8, 0x22, 0x60, 0xed, 0xcc,
0x30, 0x4c, 0x65, 0x28, 0xf6, 0x59, 0xc7, 0x78,
0x66, 0xa5, 0x10, 0xd9, 0xc1, 0xd6, 0xae, 0x5e },
{ 0xCD, 0xC8, 0x0D, 0x6F, 0xDD, 0xF1, 0x8C, 0xAB,
0x34, 0xC2, 0x59, 0x09, 0xC9, 0x9A, 0x41, 0x74,
0xfc, 0xc2, 0x8b, 0x8d, 0x4c, 0x63, 0x83, 0x7c,
0x09, 0xe8, 0x17, 0x00, 0xc1, 0x10, 0x04, 0x01,
0x8d, 0x9a, 0x9a, 0xea, 0xc0, 0xf6, 0x59, 0x6f,
0x55, 0x9c, 0x6d, 0x4d, 0xaf, 0x59, 0xa5, 0xf2,
0x6d, 0x9f, 0x20, 0x08, 0x57, 0xca, 0x6c, 0x3e,
0x9c, 0xac, 0x52, 0x4b, 0xd9, 0xac, 0xc9, 0x2a },
{ 0xDC, 0x7E, 0x84, 0xBF, 0xDA, 0x79, 0x16, 0x4B,
0x7E, 0xCD, 0x84, 0x86, 0x98, 0x5D, 0x38, 0x60,
0x4f, 0xeb, 0xdc, 0x67, 0x40, 0xd2, 0x0b, 0x3a,
0xc8, 0x8f, 0x6a, 0xd8, 0x2a, 0x4f, 0xb0, 0x8d,
0x71, 0xab, 0x47, 0xa0, 0x86, 0xe8, 0x6e, 0xed,
0xf3, 0x9d, 0x1c, 0x5b, 0xba, 0x97, 0xc4, 0x08,
0x01, 0x26, 0x14, 0x1d, 0x67, 0xf3, 0x7b, 0xe8,
0x53, 0x8f, 0x5a, 0x8b, 0xe7, 0x40, 0xe4, 0x84 }
};
#endif /* MBEDTLS_CIPHER_MODE_OFB */
#if defined(MBEDTLS_CIPHER_MODE_CTR)
/*
* AES-CTR test vectors from:
@ -1538,6 +1609,69 @@ int mbedtls_aes_self_test( int verbose )
mbedtls_printf( "\n" );
#endif /* MBEDTLS_CIPHER_MODE_CFB */
#if defined(MBEDTLS_CIPHER_MODE_OFB)
/*
* OFB mode
*/
for( i = 0; i < 6; i++ )
{
u = i >> 1;
keybits = 128 + u * 64;
mode = i & 1;
if( verbose != 0 )
mbedtls_printf( " AES-OFB-%3d (%s): ", keybits,
( mode == MBEDTLS_AES_DECRYPT ) ? "dec" : "enc" );
memcpy( iv, aes_test_ofb_iv, 16 );
memcpy( key, aes_test_ofb_key[u], keybits / 8 );
offset = 0;
ret = mbedtls_aes_setkey_enc( &ctx, key, keybits );
/*
* AES-192 is an optional feature that may be unavailable when
* there is an alternative underlying implementation i.e. when
* MBEDTLS_AES_ALT is defined.
*/
if( ret == MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE && keybits == 192 )
{
mbedtls_printf( "skipped\n" );
continue;
}
else if( ret != 0 )
{
goto exit;
}
if( mode == MBEDTLS_AES_DECRYPT )
{
memcpy( buf, aes_test_ofb_ct[u], 64 );
aes_tests = aes_test_ofb_pt;
}
else
{
memcpy( buf, aes_test_ofb_pt, 64 );
aes_tests = aes_test_ofb_ct[u];
}
ret = mbedtls_aes_crypt_ofb( &ctx, 64, &offset, iv, buf, buf );
if( ret != 0 )
goto exit;
if( memcmp( buf, aes_tests, 64 ) != 0 )
{
ret = 1;
goto exit;
}
if( verbose != 0 )
mbedtls_printf( "passed\n" );
}
if( verbose != 0 )
mbedtls_printf( "\n" );
#endif /* MBEDTLS_CIPHER_MODE_OFB */
#if defined(MBEDTLS_CIPHER_MODE_CTR)
/*
* CTR mode

2
tests/Makefile
View file

@ -46,7 +46,7 @@ LOCAL_LDFLAGS += -lz
endif
APPS = test_suite_aes.ecb$(EXEXT) test_suite_aes.cbc$(EXEXT) \
test_suite_aes.cfb$(EXEXT) test_suite_aes.ofb$(EXEXT) \
test_suite_aes.cfb$(EXEXT) test_suite_aes.ofb$(EXEXT) \
test_suite_aes.rest$(EXEXT) \
test_suite_arc4$(EXEXT) test_suite_asn1write$(EXEXT) \
test_suite_base64$(EXEXT) test_suite_blowfish$(EXEXT) \

2
tests/suites/test_suite_aes.function
View file

@ -316,7 +316,7 @@ void aes_encrypt_ofb( int fragment_size, char *hex_key_string,
iv_len = unhexify( iv_str, hex_iv_string );
in_buffer_len = unhexify( src_str, hex_src_string );
mbedtls_aes_setkey_enc( &ctx, key_str, key_len * 8 );
TEST_ASSERT( mbedtls_aes_setkey_enc( &ctx, key_str, key_len * 8 ) == 0 );
src_str_next = src_str;
while( in_buffer_len > 0 )