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81 lines
2.3 KiB
C
81 lines
2.3 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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/**
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@file eax_encrypt_authenticate_memory.c
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EAX implementation, encrypt a block of memory, by Tom St Denis
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*/
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#include "tomcrypt.h"
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#ifdef LTC_EAX_MODE
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/**
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EAX encrypt and produce an authentication tag
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@param cipher The index of the cipher desired
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@param key The secret key to use
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@param keylen The length of the secret key (octets)
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@param nonce The session nonce [use once]
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@param noncelen The length of the nonce
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@param header The header for the session
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@param headerlen The length of the header (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 destination 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 eax_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 *header, unsigned long headerlen,
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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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eax_state *eax;
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LTC_ARGCHK(key != 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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eax = XMALLOC(sizeof(*eax));
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if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = eax_encrypt(eax, pt, ct, ptlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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err = CRYPT_OK;
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(eax, sizeof(*eax));
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#endif
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XFREE(eax);
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return err;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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