Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_init.c @ 1470:8bba51a55704

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Update to libtommath v1.0.1
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Feb 2018 23:11:40 +0800
parents f849a5ca2efc
children 6dba84798cd5
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtom.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file f9_init.c
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15 F9 Support, start an F9 state
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16 */
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17
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18 #ifdef LTC_F9_MODE
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19
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20 /** Initialize F9-MAC state
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21 @param f9 [out] f9 state to initialize
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22 @param cipher Index of cipher to use
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23 @param key [in] Secret key
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24 @param keylen Length of secret key in octets
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25 Return CRYPT_OK on success
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26 */
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27 int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
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28 {
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29 int x, err;
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30
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31 LTC_ARGCHK(f9 != NULL);
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32 LTC_ARGCHK(key != NULL);
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33
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34 /* schedule the key */
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 #ifdef LTC_FAST
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43 #endif
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44
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45 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) {
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46 goto done;
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47 }
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48
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49 /* make the second key */
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50 for (x = 0; (unsigned)x < keylen; x++) {
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51 f9->akey[x] = key[x] ^ 0xAA;
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52 }
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53
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54 /* setup struct */
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55 zeromem(f9->IV, cipher_descriptor[cipher].block_length);
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56 zeromem(f9->ACC, cipher_descriptor[cipher].block_length);
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57 f9->blocksize = cipher_descriptor[cipher].block_length;
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58 f9->cipher = cipher;
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59 f9->buflen = 0;
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60 f9->keylen = keylen;
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61 done:
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62 return err;
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63 }
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64
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65 #endif
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66
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67 /* $Source$ */
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68 /* $Revision$ */
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69 /* $Date$ */
382
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70