1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomCrypt is a library that provides various cryptographic 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * algorithms in a highly modular and flexible manner. 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "tomcrypt.h" 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @file f9_init.c 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project F9 Support, start an F9 state 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef LTC_F9_MODE 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** Initialize F9-MAC state 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param f9 [out] f9 state to initialize 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param cipher Index of cipher to use 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param key [in] Secret key 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param keylen Length of secret key in octets 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project Return CRYPT_OK on success 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen) 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int x, err; 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(f9 != NULL); 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(key != NULL); 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* schedule the key */ 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef LTC_FAST 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_INVALID_ARG; 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) { 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project goto done; 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* make the second key */ 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (x = 0; (unsigned)x < keylen; x++) { 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project f9->akey[x] = key[x] ^ 0xAA; 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* setup struct */ 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project zeromem(f9->IV, cipher_descriptor[cipher].block_length); 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project zeromem(f9->ACC, cipher_descriptor[cipher].block_length); 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project f9->blocksize = cipher_descriptor[cipher].block_length; 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project f9->cipher = cipher; 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project f9->buflen = 0; 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project f9->keylen = keylen; 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectdone: 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_init.c,v $ */ 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.4 $ */ 69f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/11/08 22:54:18 $ */ 70f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 71