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aes: validate keys using crc before encryption/decryption

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CRC is calculated when the key is set. This commit also adds new tests
for ecb encryption and decryption, simulating a fault injection after the key is set.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2020-08-07 21:02:25 -04:00
parent 9df2b416b9
commit fba5921186
No known key found for this signature in database
GPG key ID: 89A90840DC388527
10 changed files with 202 additions and 8 deletions
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1
configs/baremetal.h
View file

@ -138,6 +138,7 @@
#define MBEDTLS_OID_C
#define MBEDTLS_PLATFORM_C
#define MBEDTLS_CRC_C
#define MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY
/* I/O buffer configuration */
#define MBEDTLS_SSL_MAX_CONTENT_LEN 2048

3
include/mbedtls/aes.h
View file

@ -90,6 +90,9 @@ typedef struct mbedtls_aes_context
#if defined(MBEDTLS_AES_SCA_COUNTERMEASURES)
uint32_t frk[8]; /*!< Fake AES round keys. */
#endif
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
uint16_t crc; /*!< CRC-16 of the set key */
#endif
#if defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH) && !defined(MBEDTLS_PADLOCK_C)
uint32_t buf[44]; /*!< Unaligned data buffer */
#else /* MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */

4
include/mbedtls/check_config.h
View file

@ -986,6 +986,10 @@
#error "MBEDTLS_HAVE_INT32/MBEDTLS_HAVE_INT64 and MBEDTLS_HAVE_ASM cannot be defined simultaneously"
#endif /* (MBEDTLS_HAVE_INT32 || MBEDTLS_HAVE_INT64) && MBEDTLS_HAVE_ASM */
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY) && ( !defined(MBEDTLS_CRC_C) )
#error "MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY defined, but not MBEDTLS_CRC_C"
#endif
/*
* Avoid warning from -pedantic. This is a convenient place for this
* workaround since this is included by every single file before the

14
include/mbedtls/config.h
View file

@ -2735,10 +2735,22 @@
*
* Module: library/crc.c
*
* This module enables mbedtls_crc_update.
* This module enables mbedtls_crc_update().
*/
//#define MBEDTLS_CRC_C
/**
* \def MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY
*
* Enable validation of AES keys by checking their CRC
* during every encryption/decryption.
*
* Module: library/aes.c
*
* Requires: MBEDTLS_CRC_C
*/
//#define MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY
/**
* \def MBEDTLS_GCM_C
*

75
library/aes.c
View file

@ -45,6 +45,10 @@
#include "mbedtls/aesni.h"
#endif
#if defined(MBEDTLS_CRC_C) && defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
#include "mbedtls/crc.h"
#endif
#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
@ -703,6 +707,7 @@ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
AES_VALIDATE_RET( ctx != NULL );
AES_VALIDATE_RET( key != NULL );
(void) ret;
switch( keybits )
{
@ -821,8 +826,6 @@ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
}
ret = 0;
/* Validate execution path */
if( ( flow_ctrl == keybits >> 5 ) && ( ( ctx->nr == 10 && i == 10 )
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
@ -831,7 +834,10 @@ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
#endif
) )
{
return ret;
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
ctx->crc = mbedtls_crc_update( 0, ctx->rk, keybits >> 3 );
#endif
return 0;
}
mbedtls_platform_memset( RK, 0, ( keybits >> 5 ) * 4 );
@ -926,6 +932,9 @@ exit:
}
else if( ( i == 0 ) && ( j == 4 ) )
{
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
ctx->crc = mbedtls_crc_update( 0, ctx->rk, keybits >> 3 );
#endif
return( ret );
}
else
@ -1088,6 +1097,21 @@ int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx,
// reserve based on max rounds + dummy rounds + 2 (for initial key addition)
uint8_t round_ctrl_table[( 14 + AES_SCA_CM_ROUNDS + 2 )];
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
unsigned key_bytes = 0;
uint16_t check_crc = 0;
switch( ctx->nr )
{
case 10: key_bytes = 16; break;
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
case 12: key_bytes = 24; break;
case 14: key_bytes = 32; break;
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH );
}
check_crc = mbedtls_crc_update( 0, ctx->rk, key_bytes );
#endif
aes_data_real.rk_ptr = ctx->rk;
aes_data_fake.rk_ptr = ctx->frk;
@ -1182,9 +1206,20 @@ int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx,
flow_control++;
} while( ( i = ( i + 1 ) % 4 ) != offset );
if( flow_control == tindex + dummy_rounds + 8 )
/* Double negation is used to silence an "extraneous parentheses" warning */
if( ! ( flow_control != tindex + dummy_rounds + 8 )
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
&& check_crc == ctx->crc
#endif
)
{
return 0;
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
mbedtls_platform_random_delay();
if( mbedtls_crc_update( 0, ctx->rk, key_bytes ) == ctx->crc )
#endif
{
return 0;
}
}
// Clear the output in case of a FI
@ -1369,6 +1404,21 @@ int mbedtls_internal_aes_decrypt( mbedtls_aes_context *ctx,
// reserve based on max rounds + dummy rounds + 2 (for initial key addition)
uint8_t round_ctrl_table[( 14 + AES_SCA_CM_ROUNDS + 2 )];
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
unsigned key_bytes = 0;
uint16_t check_crc = 0;
switch( ctx->nr )
{
case 10: key_bytes = 16; break;
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
case 12: key_bytes = 24; break;
case 14: key_bytes = 32; break;
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH );
}
check_crc = mbedtls_crc_update( 0, ctx->rk, key_bytes );
#endif
aes_data_real.rk_ptr = ctx->rk;
aes_data_fake.rk_ptr = ctx->frk;
@ -1463,9 +1513,20 @@ int mbedtls_internal_aes_decrypt( mbedtls_aes_context *ctx,
flow_control++;
} while( ( i = ( i + 1 ) % 4 ) != offset );
if( flow_control == tindex + dummy_rounds + 8 )
/* Double negation is used to silence an "extraneous parentheses" warning */
if( ! ( flow_control != tindex + dummy_rounds + 8 )
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
&& check_crc == ctx->crc
#endif
)
{
return 0;
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
mbedtls_platform_random_delay();
if( mbedtls_crc_update( 0, ctx->rk, key_bytes ) == ctx->crc )
#endif
{
return 0;
}
}
// Clear the output in case of a FI

3
library/version_features.c
View file

@ -687,6 +687,9 @@ static const char *features[] = {
#if defined(MBEDTLS_CRC_C)
"MBEDTLS_CRC_C",
#endif /* MBEDTLS_CRC_C */
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
"MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY",
#endif /* MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY */
#if defined(MBEDTLS_GCM_C)
"MBEDTLS_GCM_C",
#endif /* MBEDTLS_GCM_C */

8
programs/ssl/query_config.c
View file

@ -1874,6 +1874,14 @@ int query_config( const char *config )
}
#endif /* MBEDTLS_CRC_C */
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
if( strcmp( "MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY", config ) == 0 )
{
MACRO_EXPANSION_TO_STR( MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY );
return( 0 );
}
#endif /* MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY */
#if defined(MBEDTLS_GCM_C)
if( strcmp( "MBEDTLS_GCM_C", config ) == 0 )
{

1
tests/CMakeLists.txt
View file

@ -67,6 +67,7 @@ if(MSVC)
endif(MSVC)
add_test_suite(aes aes.ecb)
add_test_suite(aes aes.ecb.crc)
add_test_suite(aes aes.cbc)
add_test_suite(aes aes.cfb)
add_test_suite(aes aes.ofb)

46
tests/suites/test_suite_aes.ecb.crc.data Normal file
View file

@ -0,0 +1,46 @@
AES-128-ECB Encrypt NIST KAT #1 good CRC
aes_encrypt_ecb_crc:"00000000000000000000000000000000":"f34481ec3cc627bacd5dc3fb08f273e6":"0336763e966d92595a567cc9ce537f5e":0:0:1
AES-128-ECB Encrypt NIST KAT #1 bad CRC
aes_encrypt_ecb_crc:"00000000000000000000000000000000":"f34481ec3cc627bacd5dc3fb08f273e6":"00000000000000000000000000000000":42:MBEDTLS_ERR_PLATFORM_FAULT_DETECTED:0
AES-128-ECB Decrypt NIST KAT #1 good CRC
depends_on:!MBEDTLS_AES_ONLY_ENCRYPT
aes_decrypt_ecb_crc:"00000000000000000000000000000000":"db4f1aa530967d6732ce4715eb0ee24b":"ff000000000000000000000000000000":614:0:1
AES-128-ECB Decrypt NIST KAT #1 bad CRC
depends_on:!MBEDTLS_AES_ONLY_ENCRYPT
aes_decrypt_ecb_crc:"00000000000000000000000000000000":"db4f1aa530967d6732ce4715eb0ee24b":"00000000000000000000000000000000":42:MBEDTLS_ERR_PLATFORM_FAULT_DETECTED:0
AES-192-ECB Encrypt NIST KAT #1 good CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
aes_encrypt_ecb_crc:"000000000000000000000000000000000000000000000000":"fffffffffffffffffffff80000000000":"156f07767a85a4312321f63968338a01":0:0:1
AES-192-ECB Encrypt NIST KAT #1 bad CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
aes_encrypt_ecb_crc:"000000000000000000000000000000000000000000000000":"fffffffffffffffffffff80000000000":"00000000000000000000000000000000":42:MBEDTLS_ERR_PLATFORM_FAULT_DETECTED:0
AES-192-ECB Decrypt NIST KAT #1 good CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH:!MBEDTLS_AES_ONLY_ENCRYPT
aes_decrypt_ecb_crc:"fffffffffffffffffffffffffffffffff000000000000000":"bb2852c891c5947d2ed44032c421b85f":"00000000000000000000000000000000":31004:0:1
AES-192-ECB Decrypt NIST KAT #1 bad CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH:!MBEDTLS_AES_ONLY_ENCRYPT
aes_decrypt_ecb_crc:"fffffffffffffffffffffffffffffffff000000000000000":"bb2852c891c5947d2ed44032c421b85f":"00000000000000000000000000000000":42:MBEDTLS_ERR_PLATFORM_FAULT_DETECTED:0
AES-256-ECB Encrypt NIST KAT #1 good CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
aes_encrypt_ecb_crc:"c1cc358b449909a19436cfbb3f852ef8bcb5ed12ac7058325f56e6099aab1a1c":"00000000000000000000000000000000":"352065272169abf9856843927d0674fd":61384:0:1
AES-256-ECB Encrypt NIST KAT #1 bad CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
aes_encrypt_ecb_crc:"c1cc358b449909a19436cfbb3f852ef8bcb5ed12ac7058325f56e6099aab1a1c":"00000000000000000000000000000000":"00000000000000000000000000000000":42:MBEDTLS_ERR_PLATFORM_FAULT_DETECTED:0
AES-256-ECB Decrypt NIST KAT #1 good CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH:!MBEDTLS_AES_ONLY_ENCRYPT
aes_decrypt_ecb_crc:"fffffffffffffffffffffffffffffffffffffffffffffff00000000000000000":"edf61ae362e882ddc0167474a7a77f3a":"00000000000000000000000000000000":32504:0:1
AES-256-ECB Decrypt NIST KAT #1 bad CRC
depends_on:!MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH:!MBEDTLS_AES_ONLY_ENCRYPT
aes_decrypt_ecb_crc:"fffffffffffffffffffffffffffffffffffffffffffffff00000000000000000":"edf61ae362e882ddc0167474a7a77f3a":"00000000000000000000000000000000":42:MBEDTLS_ERR_PLATFORM_FAULT_DETECTED:0

55
tests/suites/test_suite_aes.function
View file

@ -1,5 +1,6 @@
/* BEGIN_HEADER */
#include "mbedtls/aes.h"
#include "mbedtls/platform.h"
/* END_HEADER */
/* BEGIN_DEPENDENCIES
@ -369,6 +370,60 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY:MBEDTLS_AES_SCA_COUNTERMEASURES:!MBEDTLS_AES_SETKEY_ENC_ALT:!MBEDTLS_AESNI_C */
void aes_encrypt_ecb_crc( data_t * key_str, data_t * src_str,
data_t * hex_dst_string, unsigned int crc, int crypt_result, int check_crc )
{
unsigned char output[100];
mbedtls_aes_context ctx;
memset(output, 0x00, 100);
mbedtls_aes_init( &ctx );
TEST_ASSERT( mbedtls_aes_setkey_enc( &ctx, key_str->x, key_str->len * 8 ) == 0 );
if( check_crc )
TEST_ASSERT( ctx.crc == crc );
else
ctx.crc = crc;
TEST_ASSERT( mbedtls_aes_crypt_ecb( &ctx, MBEDTLS_AES_ENCRYPT, src_str->x, output ) == crypt_result );
TEST_ASSERT( hexcmp( output, hex_dst_string->x, 16, hex_dst_string->len ) == 0 );
exit:
mbedtls_aes_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY:MBEDTLS_AES_SCA_COUNTERMEASURES:!MBEDTLS_AES_SETKEY_ENC_ALT:!MBEDTLS_AESNI_C */
void aes_decrypt_ecb_crc( data_t * key_str, data_t * src_str,
data_t * hex_dst_string, unsigned int crc, int crypt_result, int check_crc )
{
unsigned char output[100];
mbedtls_aes_context ctx;
memset(output, 0x00, 100);
mbedtls_aes_init( &ctx );
TEST_ASSERT( mbedtls_aes_setkey_dec( &ctx, key_str->x, key_str->len * 8 ) == 0 );
if( check_crc )
TEST_ASSERT( ctx.crc == crc );
else
ctx.crc = crc;
TEST_ASSERT( mbedtls_aes_crypt_ecb( &ctx, MBEDTLS_AES_DECRYPT, src_str->x, output ) == crypt_result );
TEST_ASSERT( hexcmp( output, hex_dst_string->x, 16, hex_dst_string->len ) == 0 );
exit:
mbedtls_aes_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
void aes_check_params( )
{