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Implement AES-XEX mode

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XEX mode, known as "xor-encrypt-xor", is the simple case of the XTS
mode, known as "XEX with ciphertext stealing". When the buffers to be
encrypted/decrypted have a length divisible by the length of a standard
AES block (16), XTS is exactly like XEX.
This commit is contained in:
Aorimn
2016-01-31 12:15:51 +01:00
committed by Jaeden Amero
parent b053658f95
commit 0089d36ae5
2 changed files with 77 additions and 0 deletions
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24
include/mbedtls/aes.h
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@@ -213,6 +213,30 @@ int mbedtls_aes_crypt_cbc( mbedtls_aes_context *ctx,
unsigned char *output );
#endif /* MBEDTLS_CIPHER_MODE_CBC */
#if defined(MBEDTLS_CIPHER_MODE_XEX)
/**
* \brief AES-XEX buffer encryption/decryption
* Length should be a multiple of the block size (16 bytes)
*
* \param crypt_ctx AES context for encrypting data
* \param tweak_ctx AES context for xor-ing with data
* \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
* \param length length of the input data
* \param iv initialization vector
* \param input buffer holding the input data
* \param output buffer holding the output data
*
* \return 0 if successful, or MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH
*/
int mbedtls_aes_crypt_xex( mbedtls_aes_context *crypt_ctx,
mbedtls_aes_context *tweak_ctx,
int mode,
size_t length,
unsigned char iv[16],
const unsigned char *input,
unsigned char *output );
#endif /* MBEDTLS_CIPHER_MODE_XEX */
#if defined(MBEDTLS_CIPHER_MODE_CFB)
/**
* \brief This function performs an AES-CFB128 encryption or decryption