cipher: Add wrappers for AES-XTS
AES-XTS does not support multipart use as it can only operate on an entire
sector at a time.
diff --git a/library/cipher.c b/library/cipher.c
index a5cd61c..4f12b72 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -440,6 +440,27 @@
}
#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 @@
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 );
diff --git a/library/cipher_wrap.c b/library/cipher_wrap.c
index dc76af8..070f1d8 100644
--- a/library/cipher_wrap.c
+++ b/library/cipher_wrap.c
@@ -148,6 +148,33 @@
}
#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 @@
#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 @@
};
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
#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 @@
{ 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 },