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c9bcca21e4
--HG-- branch : libtomcrypt-orig extra : convert_revision : 1626dca9b669f35fc7b143ba5133a7ea90a191d3
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "mycrypt.h"
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/* The Mask Generation Function (MGF1) for PKCS #1 -- Tom St Denis */
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#ifdef PKCS_1
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int pkcs_1_mgf1(const unsigned char *seed, unsigned long seedlen,
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int hash_idx,
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unsigned char *mask, unsigned long masklen)
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{
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unsigned long hLen, counter, x;
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int err;
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hash_state md;
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unsigned char buf[MAXBLOCKSIZE];
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_ARGCHK(seed != NULL);
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_ARGCHK(mask != NULL);
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/* ensure valid hash */
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if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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return err;
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}
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/* get hash output size */
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hLen = hash_descriptor[hash_idx].hashsize;
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/* start counter */
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counter = 0;
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while (masklen > 0) {
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/* handle counter */
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STORE32H(counter, buf);
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++counter;
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/* get hash of seed || counter */
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hash_descriptor[hash_idx].init(&md);
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if ((err = hash_descriptor[hash_idx].process(&md, seed, seedlen)) != CRYPT_OK) {
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return err;
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}
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if ((err = hash_descriptor[hash_idx].process(&md, buf, 4)) != CRYPT_OK) {
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return err;
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}
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if ((err = hash_descriptor[hash_idx].done(&md, buf)) != CRYPT_OK) {
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return err;
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}
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/* store it */
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for (x = 0; x < hLen && masklen > 0; x++, masklen--) {
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*mask++ = buf[x];
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}
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}
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return CRYPT_OK;
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}
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#endif /* PKCS_1 */
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