| // 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" |
| |
| /** |
| @file f9_init.c |
| F9 Support, start an F9 state |
| */ |
| |
| #ifdef LTC_F9_MODE |
| |
| /** Initialize F9-MAC state |
| @param f9 [out] f9 state to initialize |
| @param cipher Index of cipher to use |
| @param key [in] Secret key |
| @param keylen Length of secret key in octets |
| Return CRYPT_OK on success |
| */ |
| int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen) |
| { |
| int x, err; |
| |
| LTC_ARGCHK(f9 != NULL); |
| LTC_ARGCHK(key != NULL); |
| |
| /* schedule the key */ |
| if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
| return err; |
| } |
| |
| #ifdef LTC_FAST |
| if (cipher_descriptor[cipher]->block_length % sizeof(LTC_FAST_TYPE)) { |
| return CRYPT_INVALID_ARG; |
| } |
| #endif |
| |
| if ((err = cipher_descriptor[cipher]->setup(key, keylen, 0, &f9->key)) != CRYPT_OK) { |
| goto done; |
| } |
| |
| /* make the second key */ |
| for (x = 0; (unsigned)x < keylen; x++) { |
| f9->akey[x] = key[x] ^ 0xAA; |
| } |
| |
| /* setup struct */ |
| zeromem(f9->IV, cipher_descriptor[cipher]->block_length); |
| zeromem(f9->ACC, cipher_descriptor[cipher]->block_length); |
| f9->blocksize = cipher_descriptor[cipher]->block_length; |
| f9->cipher = cipher; |
| f9->buflen = 0; |
| f9->keylen = keylen; |
| done: |
| return err; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |
| |