| // SPDX-License-Identifier: BSD-2-Clause |
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| */ |
| #include "tomcrypt_private.h" |
| |
| /** |
| Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects |
| */ |
| |
| #ifdef LTC_XTS_MODE |
| |
| /** Start XTS mode |
| @param cipher The index of the cipher to use |
| @param key1 The encrypt key |
| @param key2 The tweak encrypt key |
| @param keylen The length of the keys (each) in octets |
| @param num_rounds The number of rounds for the cipher (0 == default) |
| @param xts [out] XTS structure |
| Returns CRYPT_OK upon success. |
| */ |
| int xts_start(int cipher, const unsigned char *key1, const unsigned char *key2, unsigned long keylen, int num_rounds, |
| symmetric_xts *xts) |
| { |
| int err; |
| |
| /* check inputs */ |
| LTC_ARGCHK(key1 != NULL); |
| LTC_ARGCHK(key2 != NULL); |
| LTC_ARGCHK(xts != NULL); |
| |
| /* check if valid */ |
| if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
| return err; |
| } |
| |
| if (cipher_descriptor[cipher]->block_length != 16) { |
| return CRYPT_INVALID_ARG; |
| } |
| |
| /* schedule the two ciphers */ |
| if ((err = cipher_descriptor[cipher]->setup(key1, keylen, num_rounds, &xts->key1)) != CRYPT_OK) { |
| return err; |
| } |
| if ((err = cipher_descriptor[cipher]->setup(key2, keylen, num_rounds, &xts->key2)) != CRYPT_OK) { |
| return err; |
| } |
| xts->cipher = cipher; |
| |
| return err; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |