53 lines
1.3 KiB
C
53 lines
1.3 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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/* OCB Implementation by Tom St Denis */
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#include "mycrypt.h"
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#ifdef OCB_MODE
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int ocb_decrypt_verify_memory(int cipher,
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const unsigned char *key, unsigned long keylen,
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const unsigned char *nonce,
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const unsigned char *ct, unsigned long ctlen,
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unsigned char *pt,
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const unsigned char *tag, unsigned long taglen,
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int *res)
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{
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int err;
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ocb_state ocb;
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_ARGCHK(key != NULL);
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_ARGCHK(nonce != NULL);
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_ARGCHK(pt != NULL);
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_ARGCHK(ct != NULL);
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_ARGCHK(tag != NULL);
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_ARGCHK(res != NULL);
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if ((err = ocb_init(&ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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return err;
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}
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while (ctlen > (unsigned long)ocb.block_len) {
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if ((err = ocb_decrypt(&ocb, ct, pt)) != CRYPT_OK) {
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return err;
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}
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ctlen -= ocb.block_len;
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pt += ocb.block_len;
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ct += ocb.block_len;
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}
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return ocb_done_decrypt(&ocb, ct, ctlen, pt, tag, taglen, res);
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}
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#endif
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