1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis 2 * 3 * LibTomCrypt is a library that provides various cryptographic 4 * algorithms in a highly modular and flexible manner. 5 * 6 * The library is free for all purposes without any express 7 * guarantee it works. 8 * 9 * Tom St Denis, tomstdenis (at) gmail.com, http://libtomcrypt.com 10 */ 11 #include "tomcrypt.h" 12 13 /** 14 @file f9_init.c 15 F9 Support, start an F9 state 16 */ 17 18 #ifdef LTC_F9_MODE 19 20 /** Initialize F9-MAC state 21 @param f9 [out] f9 state to initialize 22 @param cipher Index of cipher to use 23 @param key [in] Secret key 24 @param keylen Length of secret key in octets 25 Return CRYPT_OK on success 26 */ 27 int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen) 28 { 29 int x, err; 30 31 LTC_ARGCHK(f9 != NULL); 32 LTC_ARGCHK(key != NULL); 33 34 /* schedule the key */ 35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { 36 return err; 37 } 38 39 #ifdef LTC_FAST 40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { 41 return CRYPT_INVALID_ARG; 42 } 43 #endif 44 45 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) { 46 goto done; 47 } 48 49 /* make the second key */ 50 for (x = 0; (unsigned)x < keylen; x++) { 51 f9->akey[x] = key[x] ^ 0xAA; 52 } 53 54 /* setup struct */ 55 zeromem(f9->IV, cipher_descriptor[cipher].block_length); 56 zeromem(f9->ACC, cipher_descriptor[cipher].block_length); 57 f9->blocksize = cipher_descriptor[cipher].block_length; 58 f9->cipher = cipher; 59 f9->buflen = 0; 60 f9->keylen = keylen; 61 done: 62 return err; 63 } 64 65 #endif 66 67 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_init.c,v $ */ 68 /* $Revision: 1.4 $ */ 69 /* $Date: 2006/11/08 22:54:18 $ */ 70 71
