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Make CCM shuffling and masking optional

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Add a define for CCM shuffling and masking operations.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2020-11-26 06:34:04 -05:00
parent ab3de1daff
commit 7d0a6864d3
5 changed files with 93 additions and 18 deletions
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1
configs/baremetal.h
View File

@ -158,6 +158,7 @@
/* Fault Injection Countermeasures */
#define MBEDTLS_FI_COUNTERMEASURES
#define MBEDTLS_CCM_SHUFFLING_MASKING
#if defined(MBEDTLS_USER_CONFIG_FILE)
#include MBEDTLS_USER_CONFIG_FILE

9
include/mbedtls/config.h
View File

@ -664,6 +664,15 @@
*/
//#define MBEDTLS_FI_COUNTERMEASURES
/**
* \def MBEDTLS_CCM_SHUFFLING_MASKING
*
* Add shuffling and masking to the CCM module as an additional security
* measure.
*
*/
//#define MBEDTLS_CCM_SHUFFLING_MASKING
/**
* \def MBEDTLS_CAMELLIA_SMALL_MEMORY
*

90
library/ccm.c
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@ -114,6 +114,7 @@ void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
}
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
/* Durstenfeld's version of Fisher-Yates shuffle */
static void mbedtls_generate_permutation( unsigned char* table, size_t size )
{
@ -148,6 +149,7 @@ static void mbedtls_generate_masks( unsigned char* table, size_t size )
table[i] = mbedtls_platform_random_in_range( 256 );
}
}
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
/*
* Macros for common operations.
@ -159,6 +161,7 @@ static void mbedtls_generate_masks( unsigned char* table, size_t size )
* (Always using b as the source helps the compiler optimise a bit better.)
* Initial b masking happens outside of this macro due to various sources of it.
*/
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
#define UPDATE_CBC_MAC \
for( i = 0; i < 16; i++ ) \
{ \
@ -168,14 +171,25 @@ static void mbedtls_generate_masks( unsigned char* table, size_t size )
\
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
return( ret );
#else
#define UPDATE_CBC_MAC \
for( i = 0; i < 16; i++ ) \
y[i] ^= b[i]; \
\
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
return( ret );
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
/*
* Copy src to dst starting at a random offset, while masking the whole dst buffer.
*/
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
#define COPY_MASK( dst, src, mask, len_src, len_dst ) \
do \
{ \
unsigned j, offset = mbedtls_platform_random_in_range( 256 ); \
mbedtls_generate_masks( mask_table, 16 ); \
mbedtls_generate_permutation( perm_table, 16 ); \
for( i = 0; i < len_src; i++ ) \
{ \
j = (i + offset) % len_src; \
@ -184,11 +198,14 @@ static void mbedtls_generate_masks( unsigned char* table, size_t size )
for( ; i < len_dst; i++ ) \
(dst)[i] ^= (mask)[i]; \
} while( 0 )
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
/*
* Encrypt or decrypt a partial block with CTR
* Warning: using b for temporary storage! src and dst must not be b!
* This avoids allocating one more 16 bytes buffer while allowing src == dst.
*/
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
#define CTR_CRYPT( dst, src, len ) \
do \
{ \
@ -200,13 +217,27 @@ static void mbedtls_generate_masks( unsigned char* table, size_t size )
return( ret ); \
} \
\
for( i = 0; i < len; i++ ) \
for( i = 0; i < (len); i++ ) \
{ \
(dst)[perm_table[i]] = (src)[perm_table[i]] ^ mask_table[perm_table[i]];\
(dst)[perm_table[i]] ^= b[perm_table[i]]; \
(dst)[perm_table[i]] ^= mask_table[perm_table[i]]; \
} \
} while( 0 )
#else
#define CTR_CRYPT( dst, src, len ) \
do \
{ \
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, \
16, b, &olen ) ) != 0 ) \
{ \
return( ret ); \
} \
\
for( i = 0; i < (len); i++ ) \
(dst)[i] = (src)[i] ^ b[i]; \
} while( 0 )
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
/*
* Authenticated encryption or decryption
@ -224,12 +255,13 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
unsigned char b[16];
unsigned char y[16];
unsigned char ctr[16];
unsigned char perm_table[16];
unsigned char mask_table[16];
const unsigned char *src;
unsigned char *dst;
volatile size_t flow_ctrl = 0;
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
unsigned char perm_table[16];
unsigned char mask_table[16];
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
/*
* Check length requirements: SP800-38C A.1
* Additional requirement: a < 2^16 - 2^8 to simplify the code.
@ -266,6 +298,7 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
* 5 .. 3 (t - 2) / 2
* 2 .. 0 q - 1
*/
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
mbedtls_generate_masks( mask_table, 16 );
mbedtls_generate_permutation( perm_table, 16 );
b[0] = (unsigned char) ( ( ( add_len > 0 ) << 6 ) |
@ -279,11 +312,21 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
}
for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
b[15-i] = (unsigned char)( ( len_left & 0xFF ) ) ^ mask_table[15-i];
#else
b[0] = 0;
b[0] |= ( add_len > 0 ) << 6;
b[0] |= ( ( tag_len - 2 ) / 2 ) << 3;
b[0] |= q - 1;
mbedtls_platform_memcpy( b + 1, iv, iv_len );
flow_ctrl += iv_len; /* iv_len + 1 */
for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
b[15-i] = (unsigned char)( len_left & 0xFF );
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
if( len_left > 0 )
return( MBEDTLS_ERR_CCM_BAD_INPUT );
/* Start CBC-MAC with first block */
memset( y, 0, 16 );
UPDATE_CBC_MAC;
@ -298,16 +341,20 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
size_t use_len;
len_left = add_len;
src = add;
mbedtls_generate_masks( mask_table, 16 );
mbedtls_generate_permutation( perm_table, 16 );
mbedtls_platform_memset( b, 0, 16 );
b[0] = (unsigned char)( ( ( add_len >> 8 ) & 0xFF ) ^ mask_table[0] );
b[1] = (unsigned char)( ( ( add_len ) & 0xFF ) ^ mask_table[1] );
use_len = len_left < 16 - 2 ? len_left : 16 - 2;
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
COPY_MASK( b+2, src, mask_table+2, use_len, 14 );
b[0] = (unsigned char)( ( ( add_len >> 8 ) & 0xFF ) ^ mask_table[0] );
b[1] = (unsigned char)( ( ( add_len ) & 0xFF ) ^ mask_table[1] );
#else
b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF );
b[1] = (unsigned char)( ( add_len ) & 0xFF );
mbedtls_platform_memcpy( b + 2, src, use_len );
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
len_left -= use_len;
src += use_len;
@ -317,12 +364,14 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
while( len_left > 0 )
{
mbedtls_generate_masks( mask_table, 16 );
mbedtls_generate_permutation( perm_table, 16 );
use_len = len_left > 16 ? 16 : len_left;
mbedtls_platform_memset( b, 0, 16 );
COPY_MASK( b, src, mask_table, use_len, 16);
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
COPY_MASK( b, src, mask_table, use_len, 16 );
#else
mbedtls_platform_memcpy( b, src, use_len );
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
UPDATE_CBC_MAC;
len_left -= use_len;
@ -362,10 +411,13 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
if( mode == CCM_ENCRYPT )
{
mbedtls_generate_masks( mask_table, 16 );
mbedtls_generate_permutation( perm_table, 16 );
mbedtls_platform_memset( b, 0, 16 );
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
COPY_MASK( b, src, mask_table, use_len, 16 );
#else
mbedtls_platform_memcpy( b, src, use_len );
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
UPDATE_CBC_MAC;
flow_ctrl++; /* iv_len + 3 + ( add_len? 1 : 0 ) + encryptions */
}
@ -374,10 +426,12 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
if( mode == CCM_DECRYPT )
{
mbedtls_generate_masks( mask_table, 16 );
mbedtls_generate_permutation( perm_table, 16 );
mbedtls_platform_memset( b, 0, 16 );
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
COPY_MASK( b, dst, mask_table, use_len, 16 );
#else
mbedtls_platform_memcpy( b, dst, use_len );
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
UPDATE_CBC_MAC;
flow_ctrl++; /* iv_len + 3 + ( add_len? 1 : 0 ) + decryptions */
}

3
library/version_features.c
View File

@ -276,6 +276,9 @@ static const char *features[] = {
#if defined(MBEDTLS_FI_COUNTERMEASURES)
"MBEDTLS_FI_COUNTERMEASURES",
#endif /* MBEDTLS_FI_COUNTERMEASURES */
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
"MBEDTLS_CCM_SHUFFLING_MASKING",
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
#if defined(MBEDTLS_CAMELLIA_SMALL_MEMORY)
"MBEDTLS_CAMELLIA_SMALL_MEMORY",
#endif /* MBEDTLS_CAMELLIA_SMALL_MEMORY */

8
programs/ssl/query_config.c
View File

@ -778,6 +778,14 @@ int query_config( const char *config )
}
#endif /* MBEDTLS_FI_COUNTERMEASURES */
#if defined(MBEDTLS_CCM_SHUFFLING_MASKING)
if( strcmp( "MBEDTLS_CCM_SHUFFLING_MASKING", config ) == 0 )
{
MACRO_EXPANSION_TO_STR( MBEDTLS_CCM_SHUFFLING_MASKING );
return( 0 );
}
#endif /* MBEDTLS_CCM_SHUFFLING_MASKING */
#if defined(MBEDTLS_CAMELLIA_SMALL_MEMORY)
if( strcmp( "MBEDTLS_CAMELLIA_SMALL_MEMORY", config ) == 0 )
{