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https://github.com/yuzu-emu/mbedtls.git
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aes: Add AES-XTS cipher block mode
Add XEX-based tweaked-codebook mode with ciphertext stealing (XTS) for use with AES.
This commit is contained in:
Jaeden Amero
parent
49411ccd0d
commit
9d3eba4666
@ -88,6 +88,18 @@ typedef struct
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}
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mbedtls_aes_context;
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief The AES XTS context-type definition.
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*/
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typedef struct
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{
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mbedtls_aes_context crypt; /*!< The AES context to use for AES block
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encryption or decryption. */
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mbedtls_aes_context tweak; /*!< The AES context used for tweak computation. */
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} mbedtls_aes_xts_context;
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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#else /* MBEDTLS_AES_ALT */
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#include "aes_alt.h"
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#endif /* MBEDTLS_AES_ALT */
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@ -109,6 +121,25 @@ void mbedtls_aes_init( mbedtls_aes_context *ctx );
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*/
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void mbedtls_aes_free( mbedtls_aes_context *ctx );
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief This function initializes the specified AES XTS context.
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*
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* It must be the first API called before using
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* the context.
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*
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* \param ctx The AES XTS context to initialize.
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*/
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void mbedtls_aes_xts_init( mbedtls_aes_xts_context *ctx );
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/**
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* \brief This function releases and clears the specified AES XTS context.
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*
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* \param ctx The AES XTS context to clear.
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*/
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void mbedtls_aes_xts_free( mbedtls_aes_xts_context *ctx );
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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/**
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* \brief This function sets the encryption key.
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*
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@ -141,6 +172,44 @@ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
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int mbedtls_aes_setkey_dec( mbedtls_aes_context *ctx, const unsigned char *key,
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unsigned int keybits );
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief This function sets the encryption key.
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*
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* \param ctx The AES XTS context to which the key should be bound.
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* \param key The encryption key. This is comprised of the XTS key1
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* concatenated with the XTS key2.
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* \param keybits The size of data passed in bits. Valid options are:
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* <ul><li>256 bits</li>
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* <li>384 bits</li>
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* <li>512 bits</li></ul>
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.
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*/
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int mbedtls_aes_xts_setkey_enc( mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits );
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/**
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* \brief This function sets the decryption key.
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*
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* \param ctx The AES XTS context to which the key should be bound.
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* \param key The decryption key. This is comprised of the XTS key1
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* concatenated with the XTS key2.
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* \param keybits The size of data passed. Valid options are:
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* <ul><li>256 bits</li>
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* <li>384 bits</li>
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* <li>512 bits</li></ul>
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_AES_INVALID_KEY_LENGTH on failure.
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*/
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int mbedtls_aes_xts_setkey_dec( mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits );
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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/**
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* \brief This function performs an AES single-block encryption or
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* decryption operation.
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@ -333,6 +402,44 @@ int mbedtls_aes_crypt_ctr( mbedtls_aes_context *ctx,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_CTR */
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/**
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* \brief This function performs an AES-XTS encryption or decryption
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* operation for an entire XTS sector.
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*
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* AES-XTS encrypts or decrypts blocks based on their location as
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* defined by a sector number. These must be provided by \p sector.
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*
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* NIST SP 800-38E limits the maximum size of a data unit to 2**20
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* AES blocks. If the data unit is larger than this, this function
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* returns #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH.
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*
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* \param ctx The AES XTS context to use for AES XTS operations.
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* \param mode The AES operation: #MBEDTLS_AES_ENCRYPT or
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* #MBEDTLS_AES_DECRYPT.
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* \param length The length of both an entire sector and the input data
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* in bytes. The length must be at least 16 bytes. The
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* length does not need to be a multiple of 16 bytes.
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* \param data_unit The data unit (commonly a block device sector) address
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* in byte array form. The least significant byte must be
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* at sector[0]. The most significant byte must be at
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* sector[15]. Array must be 16 bytes in length.
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* \param input The buffer holding the input data.
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* \param output The buffer holding the output data.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH if length smaller
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* than an AES block in size (16 bytes) or if the length is
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* larger than 2**20 blocks.
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*/
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int mbedtls_aes_crypt_xts( mbedtls_aes_xts_context *ctx,
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int mode,
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size_t length,
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const unsigned char data_unit[16],
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const unsigned char *input,
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unsigned char *output );
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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/**
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* \brief Internal AES block encryption function. This is only
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* exposed to allow overriding it using
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@ -509,6 +509,14 @@
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*/
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#define MBEDTLS_CIPHER_MODE_CTR
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/**
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* \def MBEDTLS_CIPHER_MODE_XTS
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*
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* Enable XEX-based tweaked-codebook mode with ciphertext stealing mode (XTS)
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* for symmetric ciphers.
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*/
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#define MBEDTLS_CIPHER_MODE_XTS
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/**
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* \def MBEDTLS_CIPHER_NULL_CIPHER
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*
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316
library/aes.c
316
library/aes.c
@ -521,6 +521,20 @@ void mbedtls_aes_free( mbedtls_aes_context *ctx )
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mbedtls_platform_zeroize( ctx, sizeof( mbedtls_aes_context ) );
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}
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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void mbedtls_aes_xts_init( mbedtls_aes_xts_context *ctx )
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{
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mbedtls_aes_init( &ctx->crypt );
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mbedtls_aes_init( &ctx->tweak );
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}
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void mbedtls_aes_xts_free( mbedtls_aes_xts_context *ctx )
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{
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mbedtls_aes_free( &ctx->crypt );
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mbedtls_aes_free( &ctx->tweak );
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}
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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/*
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* AES key schedule (encryption)
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*/
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@ -702,6 +716,45 @@ exit:
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return( ret );
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}
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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static int mbedtls_aes_xts_setkey( mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits,
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int (*setkey1)( mbedtls_aes_context *ctx,
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const unsigned char *key,
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unsigned int keybits ) )
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{
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const unsigned int key1bits = keybits / 2;
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const unsigned int key2bits = keybits / 2;
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const unsigned int key1bytes = key1bits / 8;
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const unsigned char *key1 = &key[0];
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const unsigned char *key2 = &key[key1bytes];
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int ret;
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ret = mbedtls_aes_setkey_enc( &ctx->tweak, key2, key2bits );
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if( ret )
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return( ret );
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return( setkey1( &ctx->crypt, key1, key1bits ) );
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}
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int mbedtls_aes_xts_setkey_enc( mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits)
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{
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return mbedtls_aes_xts_setkey( ctx, key, keybits, mbedtls_aes_setkey_enc );
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}
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int mbedtls_aes_xts_setkey_dec( mbedtls_aes_xts_context *ctx,
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const unsigned char *key,
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unsigned int keybits)
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{
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return mbedtls_aes_xts_setkey( ctx, key, keybits, mbedtls_aes_setkey_dec );
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}
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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#endif /* !MBEDTLS_AES_SETKEY_DEC_ALT */
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#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
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@ -1099,6 +1152,132 @@ int mbedtls_aes_crypt_ctr( mbedtls_aes_context *ctx,
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}
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#endif /* MBEDTLS_CIPHER_MODE_CTR */
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/*
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* AES-XTS buffer encryption/decryption
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*/
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/* Multiplication by x in the Galois field of GF(2^n) (aka 2, or left shift) */
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static void multiply_by_x_gf128( const unsigned char *in, unsigned char *out )
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{
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size_t i;
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const unsigned char overflow = in[15] >> 0x07;
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/* XXX speed up multiplication by going 32-bit at a time instead of 8-bit
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* */
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/* Don't we already have functions that can multiply n-bit numbers
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* efficiently? bignum... mpi... Maybe AES NI can do this multiplication
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* (galois field 128 multiplication by x, or some sort of lfsr))?*/
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/* Feedback polynomial: x**128 + x**7 + x**3 + x + 1 (0b10000111)*/
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i = 16;
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while( --i ) {
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const unsigned char carry = in[i - 1] >> 0x07;
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out[i] = (in[i] << 1) | carry;
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}
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out[0] = (in[0] << 1) ^ (overflow ? 0x87 : 0x00);
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}
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int mbedtls_aes_crypt_xts( mbedtls_aes_xts_context *ctx,
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int mode,
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size_t length,
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const unsigned char data_unit[16],
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const unsigned char *input,
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unsigned char *output )
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{
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size_t blocks = length / 16;
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size_t leftover = length % 16;
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unsigned char tweak[16];
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unsigned char tweak_tmp[16];
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unsigned char tmp[16];
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/* Sectors must be at least 16 bytes. */
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if( length < 16)
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return MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH;
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/* NIST SP 80-38E disallows data units larger than 2**20 blocks. */
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if( (blocks > 0x100000) || (blocks == 0x100000 && leftover > 0))
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return MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH;
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/* Compute the tweak. */
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memcpy( tweak, data_unit, sizeof(tweak) );
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mbedtls_aes_crypt_ecb( &ctx->tweak, MBEDTLS_AES_ENCRYPT, tweak, tweak );
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while( blocks-- ) {
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size_t i;
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/* XXX Code review: Sucks to have conditionals inside this loop.
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* Suggestions as to whether its worth extracting this outside the toop
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* are welcome. */
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if( leftover && ( mode == MBEDTLS_AES_DECRYPT ) && blocks == 0 )
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{
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/* We are on the last block in a decrypt operation that has
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* leftover bytes, so we need to use the next tweak for this block,
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* and this tweak for the lefover bytes. Save the current tweak for
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* the leftovers and then update the current tweak for use on this,
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* the last full block. */
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memcpy( tweak_tmp, tweak, sizeof(tweak));
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multiply_by_x_gf128( tweak, tweak );
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}
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/* XXX Code review: Don't we have any functions to more efficiently xor
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* big nums together than byte-by-byte? */
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for( i = 0; i < 16; i++ )
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tmp[i] = input[i] ^ tweak[i];
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mbedtls_aes_crypt_ecb( &ctx->crypt, mode, tmp, tmp );
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for( i = 0; i < 16; i++ )
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output[i] = tmp[i] ^ tweak[i];
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/* Update the tweak for the next block */
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multiply_by_x_gf128( tweak, tweak );
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output += 16;
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input += 16;
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}
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if( leftover )
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{
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/* If we are on the leftover bytes in a decrypt operation, we need to
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* use the previous tweak for these bytes (as saved in tweak_tmp). */
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unsigned char *t = mode == MBEDTLS_AES_DECRYPT ? tweak_tmp : tweak;
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/* We are now on the final part of the data unit, which doesn't divide
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* evenly by 16. It's time for ciphertext stealing. */
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size_t i;
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unsigned char *prev_output = output - 16;
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/* Copy ciphertext bytes from previous block to our output for each
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* byte of cyphertext we won't steal. At the same time, the remainder
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* of input for this final round (since the loop bounds are the same).
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* */
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/* XXX if we use faster xor functions later here, we'll likely have to
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* break apart the loop. we might not be able to use faster xor, since
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* the leftovers could be any number of bytes (not multiples of
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* 16) (our faster xor would need to support aligned and unaligned
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* sizes) */
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for( i = 0; i < leftover; i++ )
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{
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output[i] = prev_output[i];
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tmp[i] = input[i] ^ t[i];
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}
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/* Copy ciphertext bytes from the previous block for input in this round. */
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for( ; i < 16; i++)
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tmp[i] = prev_output[i] ^ t[i];
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mbedtls_aes_crypt_ecb( &ctx->crypt, mode, tmp, tmp );
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/* Write the result back to the previous block, overriding the previous
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* output we copied. */
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for( i = 0; i < 16; i++ )
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prev_output[i] = tmp[i] ^ t[i];
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}
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return( 0 );
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}
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#endif /* MBEDTLS_CIPHER_MODE_XTS */
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#endif /* !MBEDTLS_AES_ALT */
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#if defined(MBEDTLS_SELF_TEST)
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@ -1278,6 +1457,74 @@ static const int aes_test_ctr_len[3] =
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{ 16, 32, 36 };
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#endif /* MBEDTLS_CIPHER_MODE_CTR */
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#if defined(MBEDTLS_CIPHER_MODE_XTS)
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/*
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* AES-XTS test vectors from:
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*
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* IEEE P1619/D16 Annex B
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* https://web.archive.org/web/20150629024421/http://grouper.ieee.org/groups/1619/email/pdf00086.pdf
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* (Archived from original at http://grouper.ieee.org/groups/1619/email/pdf00086.pdf)
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*/
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static const unsigned char aes_test_xts_key[][32] =
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{
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
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0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
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0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
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0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22 },
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{ 0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8,
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0xf7, 0xf6, 0xf5, 0xf4, 0xf3, 0xf2, 0xf1, 0xf0,
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0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
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0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22 },
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};
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static const unsigned char aes_test_xts_pt32[][32] =
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{
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44 },
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{ 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
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0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44 },
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};
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static const unsigned char aes_test_xts_ct32[][32] =
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{
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{ 0x91, 0x7c, 0xf6, 0x9e, 0xbd, 0x68, 0xb2, 0xec,
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0x9b, 0x9f, 0xe9, 0xa3, 0xea, 0xdd, 0xa6, 0x92,
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0xcd, 0x43, 0xd2, 0xf5, 0x95, 0x98, 0xed, 0x85,
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0x8c, 0x02, 0xc2, 0x65, 0x2f, 0xbf, 0x92, 0x2e },
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{ 0xc4, 0x54, 0x18, 0x5e, 0x6a, 0x16, 0x93, 0x6e,
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0x39, 0x33, 0x40, 0x38, 0xac, 0xef, 0x83, 0x8b,
|
||||
0xfb, 0x18, 0x6f, 0xff, 0x74, 0x80, 0xad, 0xc4,
|
||||
0x28, 0x93, 0x82, 0xec, 0xd6, 0xd3, 0x94, 0xf0 },
|
||||
{ 0xaf, 0x85, 0x33, 0x6b, 0x59, 0x7a, 0xfc, 0x1a,
|
||||
0x90, 0x0b, 0x2e, 0xb2, 0x1e, 0xc9, 0x49, 0xd2,
|
||||
0x92, 0xdf, 0x4c, 0x04, 0x7e, 0x0b, 0x21, 0x53,
|
||||
0x21, 0x86, 0xa5, 0x97, 0x1a, 0x22, 0x7a, 0x89 },
|
||||
};
|
||||
|
||||
static const unsigned char aes_test_xts_data_unit[][16] =
|
||||
{
|
||||
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
|
||||
{ 0x33, 0x33, 0x33, 0x33, 0x33, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
|
||||
{ 0x33, 0x33, 0x33, 0x33, 0x33, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
|
||||
};
|
||||
|
||||
#endif /* MBEDTLS_CIPHER_MODE_XTS */
|
||||
|
||||
/*
|
||||
* Checkup routine
|
||||
*/
|
||||
@ -1301,6 +1548,9 @@ int mbedtls_aes_self_test( int verbose )
|
||||
int len;
|
||||
unsigned char nonce_counter[16];
|
||||
unsigned char stream_block[16];
|
||||
#endif
|
||||
#if defined(MBEDTLS_CIPHER_MODE_XTS)
|
||||
mbedtls_aes_xts_context ctx_xts;
|
||||
#endif
|
||||
mbedtls_aes_context ctx;
|
||||
|
||||
@ -1558,6 +1808,72 @@ int mbedtls_aes_self_test( int verbose )
|
||||
mbedtls_printf( "\n" );
|
||||
#endif /* MBEDTLS_CIPHER_MODE_CTR */
|
||||
|
||||
#if defined(MBEDTLS_CIPHER_MODE_XTS)
|
||||
{
|
||||
static const int num_tests =
|
||||
sizeof(aes_test_xts_key) / sizeof(*aes_test_xts_key);
|
||||
|
||||
/*
|
||||
* XTS mode
|
||||
*/
|
||||
mbedtls_aes_xts_init( &ctx_xts );
|
||||
|
||||
for( i = 0; i < num_tests << 1; i++ )
|
||||
{
|
||||
const unsigned char *data_unit;
|
||||
u = i >> 1;
|
||||
mode = i & 1;
|
||||
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( " AES-XTS-128 (%s): ",
|
||||
( mode == MBEDTLS_AES_DECRYPT ) ? "dec" : "enc" );
|
||||
|
||||
memset( key, 0, sizeof( key ) );
|
||||
memcpy( key, aes_test_xts_key[u], 32 );
|
||||
data_unit = aes_test_xts_data_unit[u];
|
||||
|
||||
len = sizeof( *aes_test_xts_ct32 );
|
||||
|
||||
if( mode == MBEDTLS_AES_DECRYPT )
|
||||
{
|
||||
ret = mbedtls_aes_xts_setkey_dec( &ctx_xts, key, 256 );
|
||||
if( ret )
|
||||
goto exit;
|
||||
memcpy( buf, aes_test_xts_ct32[u], len );
|
||||
aes_tests = aes_test_xts_pt32[u];
|
||||
}
|
||||
else
|
||||
{
|
||||
ret = mbedtls_aes_xts_setkey_enc( &ctx_xts, key, 256 );
|
||||
if( ret )
|
||||
goto exit;
|
||||
memcpy( buf, aes_test_xts_pt32[u], len );
|
||||
aes_tests = aes_test_xts_ct32[u];
|
||||
}
|
||||
|
||||
|
||||
ret = mbedtls_aes_crypt_xts( &ctx_xts, mode, len, data_unit,
|
||||
buf, buf );
|
||||
if( ret != 0 )
|
||||
goto exit;
|
||||
|
||||
if( memcmp( buf, aes_tests, len ) != 0 )
|
||||
{
|
||||
ret = 1;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( "passed\n" );
|
||||
}
|
||||
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( "\n" );
|
||||
|
||||
mbedtls_aes_xts_free( &ctx_xts );
|
||||
}
|
||||
#endif /* MBEDTLS_CIPHER_MODE_XTS */
|
||||
|
||||
ret = 0;
|
||||
|
||||
exit:
|
||||
|
||||
@ -252,6 +252,9 @@ static const char *features[] = {
|
||||
#if defined(MBEDTLS_CIPHER_MODE_CTR)
|
||||
"MBEDTLS_CIPHER_MODE_CTR",
|
||||
#endif /* MBEDTLS_CIPHER_MODE_CTR */
|
||||
#if defined(MBEDTLS_CIPHER_MODE_XTS)
|
||||
"MBEDTLS_CIPHER_MODE_XTS",
|
||||
#endif /* MBEDTLS_CIPHER_MODE_XTS */
|
||||
#if defined(MBEDTLS_CIPHER_NULL_CIPHER)
|
||||
"MBEDTLS_CIPHER_NULL_CIPHER",
|
||||
#endif /* MBEDTLS_CIPHER_NULL_CIPHER */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user