88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
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/* 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@gmail.com, http://libtom.org
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*/
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/**
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@file ocb3_encrypt_authenticate_memory.c
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OCB implementation, encrypt block of memory, by Tom St Denis
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*/
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#include "tomcrypt.h"
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#ifdef LTC_OCB3_MODE
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/**
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Encrypt and generate an authentication code for a buffer of memory
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@param cipher The index of the cipher desired
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@param key The secret key
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@param keylen The length of the secret key (octets)
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@param nonce The session nonce (length of the block ciphers block size)
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@param noncelen The length of the nonce (octets)
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@param adata The AAD - additional associated data
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@param adatalen The length of AAD (octets)
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@param pt The plaintext
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@param ptlen The length of the plaintext (octets)
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@param ct [out] The ciphertext
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@param tag [out] The authentication tag
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@param taglen [in/out] The max size and resulting size of the authentication tag
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@return CRYPT_OK if successful
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*/
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int ocb3_encrypt_authenticate_memory(int cipher,
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const unsigned char *key, unsigned long keylen,
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const unsigned char *nonce, unsigned long noncelen,
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const unsigned char *adata, unsigned long adatalen,
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const unsigned char *pt, unsigned long ptlen,
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unsigned char *ct,
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unsigned char *tag, unsigned long *taglen)
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{
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int err;
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ocb3_state *ocb;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(nonce != NULL);
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(tag != NULL);
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LTC_ARGCHK(taglen != NULL);
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/* allocate memory */
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ocb = XMALLOC(sizeof(ocb3_state));
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if (ocb == NULL) {
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return CRYPT_MEM;
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}
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if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = ocb3_encrypt_last(ocb, pt, ptlen, ct)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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err = ocb3_done(ocb, tag, taglen);
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(ocb, sizeof(ocb3_state));
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#endif
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XFREE(ocb);
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return err;
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}
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#endif
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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