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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 425382d4fb
commit c653990ed5
5 changed files with 260 additions and 1 deletions
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6
include/mbedtls/cipher.h
View file

@ -167,6 +167,8 @@ typedef enum {
MBEDTLS_CIPHER_AES_128_OFB, /**< AES 128-bit cipher in OFB mode. */
MBEDTLS_CIPHER_AES_192_OFB, /**< AES 192-bit cipher in OFB mode. */
MBEDTLS_CIPHER_AES_256_OFB, /**< AES 256-bit cipher in OFB 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. */
@ -180,6 +182,7 @@ 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. */
@ -295,7 +298,8 @@ 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

@ -79,6 +79,13 @@ struct mbedtls_cipher_base_t
const unsigned char *input, unsigned char *output );
#endif
#if defined(MBEDTLS_CIPHER_MODE_XTS)
/** Encrypt or decrypt 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,