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annotate pkcs_1_mgf1.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +0000
parents d7da3b1e1540
children 5d99163f7e32
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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://libtomcrypt.org
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10 */
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11 #include "mycrypt.h"
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12
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13 /* The Mask Generation Function (MGF1) for PKCS #1 -- Tom St Denis */
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14
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15 #ifdef PKCS_1
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16
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17 int pkcs_1_mgf1(const unsigned char *seed, unsigned long seedlen,
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18 int hash_idx,
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19 unsigned char *mask, unsigned long masklen)
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20 {
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21 unsigned long hLen, counter, x;
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22 int err;
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23 hash_state md;
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24 unsigned char buf[MAXBLOCKSIZE];
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25
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26 _ARGCHK(seed != NULL);
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27 _ARGCHK(mask != NULL);
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28
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29 /* ensure valid hash */
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30 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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31 return err;
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32 }
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33
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34 /* get hash output size */
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35 hLen = hash_descriptor[hash_idx].hashsize;
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36
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37 /* start counter */
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38 counter = 0;
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39
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40 while (masklen > 0) {
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41 /* handle counter */
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42 STORE32H(counter, buf);
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43 ++counter;
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44
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45 /* get hash of seed || counter */
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46 hash_descriptor[hash_idx].init(&md);
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47 if ((err = hash_descriptor[hash_idx].process(&md, seed, seedlen)) != CRYPT_OK) {
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48 return err;
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49 }
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50 if ((err = hash_descriptor[hash_idx].process(&md, buf, 4)) != CRYPT_OK) {
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51 return err;
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52 }
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53 if ((err = hash_descriptor[hash_idx].done(&md, buf)) != CRYPT_OK) {
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54 return err;
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55 }
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56
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57 /* store it */
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58 for (x = 0; x < hLen && masklen > 0; x++, masklen--) {
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59 *mask++ = buf[x];
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60 }
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61 }
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62
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63 return CRYPT_OK;
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64 }
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65
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66 #endif /* PKCS_1 */