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cipher: Add wrappers for AES-XTS

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AES-XTS does not support multipart use as it can only operate on an entire
sector at a time.
This commit is contained in:
Jaeden Amero 2018-04-30 17:17:41 +01:00
parent 184d06942e
commit e4daf77c2e
5 changed files with 248 additions and 1 deletions
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6
include/mbedtls/cipher.h
View File

@ -145,6 +145,8 @@ typedef enum {
MBEDTLS_CIPHER_CAMELLIA_128_CCM, /**< Camellia cipher with 128-bit CCM mode. */
MBEDTLS_CIPHER_CAMELLIA_192_CCM, /**< Camellia cipher with 192-bit CCM mode. */
MBEDTLS_CIPHER_CAMELLIA_256_CCM, /**< Camellia cipher with 256-bit CCM mode. */
MBEDTLS_CIPHER_AES_128_XTS, /**< AES 128-bit cipher in XTS block mode. */
MBEDTLS_CIPHER_AES_256_XTS, /**< AES 256-bit cipher in XTS block mode. */
} mbedtls_cipher_type_t;
/** Supported cipher modes. */
@ -158,6 +160,7 @@ typedef enum {
MBEDTLS_MODE_GCM, /**< The GCM cipher mode. */
MBEDTLS_MODE_STREAM, /**< The stream cipher mode. */
MBEDTLS_MODE_CCM, /**< The CCM cipher mode. */
MBEDTLS_MODE_XTS, /**< The XTS cipher mode. */
} mbedtls_cipher_mode_t;
/** Supported cipher padding types. */
@ -273,7 +276,8 @@ typedef struct {
/** Number of Bytes that have not been processed yet. */
size_t unprocessed_len;
/** Current IV or NONCE_COUNTER for CTR-mode. */
/** Current IV or NONCE_COUNTER for CTR-mode, data unit (or sector) number
* for XTS-mode. */
unsigned char iv[MBEDTLS_MAX_IV_LENGTH];
/** IV size in Bytes, for ciphers with variable-length IVs. */

7
include/mbedtls/cipher_internal.h
View File

@ -71,6 +71,13 @@ struct mbedtls_cipher_base_t
const unsigned char *input, unsigned char *output );
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
/** Encrypt using XTS */
int (*xts_func)( void *ctx, mbedtls_operation_t mode, size_t length,
const unsigned char data_unit[16],
const unsigned char *input, unsigned char *output );
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
/** Encrypt using STREAM */
int (*stream_func)( void *ctx, size_t length,

22
library/cipher.c
View File

@ -440,6 +440,27 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
}
#endif /* MBEDTLS_CIPHER_MODE_CTR */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
if( ctx->cipher_info->mode == MBEDTLS_MODE_XTS )
{
if ( ctx->unprocessed_len ) {
/* We can only process an entire sector at a time. */
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
}
ret = ctx->cipher_info->base->xts_func( ctx->cipher_ctx,
ctx->operation, ilen, ctx->iv, input, output );
if( ret != 0 )
{
return( ret );
}
*olen = ilen;
return( 0 );
}
#endif /* MBEDTLS_CIPHER_MODE_XTS */
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
if( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM )
{
@ -641,6 +662,7 @@ int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
MBEDTLS_MODE_XTS == ctx->cipher_info->mode ||
MBEDTLS_MODE_STREAM == ctx->cipher_info->mode )
{
return( 0 );

150
library/cipher_wrap.c
View File

@ -148,6 +148,33 @@ static int aes_crypt_ctr_wrap( void *ctx, size_t length, size_t *nc_off,
}
#endif /* MBEDTLS_CIPHER_MODE_CTR */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
static int aes_crypt_xts_wrap( void *ctx, mbedtls_operation_t operation,
size_t length,
const unsigned char data_unit[16],
const unsigned char *input,
unsigned char *output )
{
mbedtls_aes_xts_context *xts_ctx = ctx;
int mode;
switch (operation)
{
case MBEDTLS_ENCRYPT:
mode = MBEDTLS_AES_ENCRYPT;
break;
case MBEDTLS_DECRYPT:
mode = MBEDTLS_AES_DECRYPT;
break;
default:
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
return mbedtls_aes_crypt_xts( xts_ctx, mode, length,
data_unit, input, output );
}
#endif /* MBEDTLS_CIPHER_MODE_XTS */
static int aes_setkey_dec_wrap( void *ctx, const unsigned char *key,
unsigned int key_bitlen )
{
@ -190,6 +217,9 @@ static const mbedtls_cipher_base_t aes_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
aes_crypt_ctr_wrap,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -337,6 +367,89 @@ static const mbedtls_cipher_info_t aes_256_ctr_info = {
};
#endif /* MBEDTLS_CIPHER_MODE_CTR */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
static int xts_aes_setkey_enc_wrap( void *ctx, const unsigned char *key,
unsigned int key_bitlen )
{
mbedtls_aes_xts_context *xts_ctx = ctx;
return( mbedtls_aes_xts_setkey_enc( xts_ctx, key, key_bitlen ) );
}
static int xts_aes_setkey_dec_wrap( void *ctx, const unsigned char *key,
unsigned int key_bitlen )
{
mbedtls_aes_xts_context *xts_ctx = ctx;
return( mbedtls_aes_xts_setkey_dec( xts_ctx, key, key_bitlen ) );
}
static void *xts_aes_ctx_alloc( void )
{
mbedtls_aes_xts_context *xts_ctx = mbedtls_calloc( 1, sizeof( *xts_ctx ) );
if( xts_ctx )
mbedtls_aes_xts_init( xts_ctx );
return( xts_ctx );
}
static void xts_aes_ctx_free( void *ctx )
{
mbedtls_aes_xts_context *xts_ctx = ctx;
if ( !xts_ctx )
return;
mbedtls_aes_xts_free( xts_ctx );
mbedtls_free( xts_ctx );
}
static const mbedtls_cipher_base_t xts_aes_info = {
MBEDTLS_CIPHER_ID_AES,
NULL,
#if defined(MBEDTLS_CIPHER_MODE_CBC)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
aes_crypt_xts_wrap,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
xts_aes_setkey_enc_wrap,
xts_aes_setkey_dec_wrap,
xts_aes_ctx_alloc,
xts_aes_ctx_free
};
static const mbedtls_cipher_info_t aes_128_xts_info = {
MBEDTLS_CIPHER_AES_128_XTS,
MBEDTLS_MODE_XTS,
256,
"AES-128-XTS",
16,
0,
16,
&xts_aes_info
};
static const mbedtls_cipher_info_t aes_256_xts_info = {
MBEDTLS_CIPHER_AES_256_XTS,
MBEDTLS_MODE_XTS,
512,
"AES-256-XTS",
16,
0,
16,
&xts_aes_info
};
#endif /* MBEDTLS_CIPHER_MODE_XTS */
#if defined(MBEDTLS_GCM_C)
static int gcm_aes_setkey_wrap( void *ctx, const unsigned char *key,
unsigned int key_bitlen )
@ -357,6 +470,9 @@ static const mbedtls_cipher_base_t gcm_aes_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -420,6 +536,9 @@ static const mbedtls_cipher_base_t ccm_aes_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -547,6 +666,9 @@ static const mbedtls_cipher_base_t camellia_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
camellia_crypt_ctr_wrap,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -714,6 +836,9 @@ static const mbedtls_cipher_base_t gcm_camellia_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -777,6 +902,9 @@ static const mbedtls_cipher_base_t ccm_camellia_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -953,6 +1081,9 @@ static const mbedtls_cipher_base_t des_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -998,6 +1129,9 @@ static const mbedtls_cipher_base_t des_ede_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -1043,6 +1177,9 @@ static const mbedtls_cipher_base_t des_ede3_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -1152,6 +1289,9 @@ static const mbedtls_cipher_base_t blowfish_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
blowfish_crypt_ctr_wrap,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
NULL,
#endif
@ -1262,6 +1402,9 @@ static const mbedtls_cipher_base_t arc4_base_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
arc4_crypt_stream_wrap,
#endif
@ -1325,6 +1468,9 @@ static const mbedtls_cipher_base_t null_base_info = {
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
NULL,
#endif
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
null_crypt_stream,
#endif
@ -1367,6 +1513,10 @@ const mbedtls_cipher_definition_t mbedtls_cipher_definitions[] =
{ MBEDTLS_CIPHER_AES_192_CTR, &aes_192_ctr_info },
{ MBEDTLS_CIPHER_AES_256_CTR, &aes_256_ctr_info },
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
{ MBEDTLS_CIPHER_AES_128_XTS, &aes_128_xts_info },
{ MBEDTLS_CIPHER_AES_256_XTS, &aes_256_xts_info },
#endif
#if defined(MBEDTLS_GCM_C)
{ MBEDTLS_CIPHER_AES_128_GCM, &aes_128_gcm_info },
{ MBEDTLS_CIPHER_AES_192_GCM, &aes_192_gcm_info },

64
tests/suites/test_suite_cipher.aes.data
View File

@ -474,6 +474,70 @@ AES-128 CFB - Encrypt and decrypt 32 bytes in multiple parts 1
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CFB
enc_dec_buf_multipart:MBEDTLS_CIPHER_AES_128_CFB128:128:16:16:-1:16:16:16:16
AES-128 XTS - Encrypt and decrypt 16 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:16:-1
AES-128 XTS - Encrypt and decrypt 17 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:17:-1
AES-128 XTS - Encrypt and decrypt 31 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:31:-1
AES-128 XTS - Encrypt and decrypt 32 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:32:-1
AES-128 XTS - Encrypt and decrypt 33 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:33:-1
AES-128 XTS - Encrypt and decrypt 47 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:47:-1
AES-128 XTS - Encrypt and decrypt 48 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:48:-1
AES-128 XTS - Encrypt and decrypt 49 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_128_XTS:"AES-128-XTS":256:49:-1
AES-256 XTS - Encrypt and decrypt 16 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:16:-1
AES-256 XTS - Encrypt and decrypt 17 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:17:-1
AES-256 XTS - Encrypt and decrypt 31 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:31:-1
AES-256 XTS - Encrypt and decrypt 32 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:32:-1
AES-256 XTS - Encrypt and decrypt 33 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:33:-1
AES-256 XTS - Encrypt and decrypt 47 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:47:-1
AES-256 XTS - Encrypt and decrypt 48 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:48:-1
AES-256 XTS - Encrypt and decrypt 49 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_XTS
enc_dec_buf:MBEDTLS_CIPHER_AES_256_XTS:"AES-256-XTS":512:49:-1
AES-128 CTR - Encrypt and decrypt 0 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CTR
enc_dec_buf:MBEDTLS_CIPHER_AES_128_CTR:"AES-128-CTR":128:0:-1