| // SPDX-License-Identifier: BSD-2-Clause |
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| */ |
| |
| /** |
| @file eax_encrypt_authenticate_memory.c |
| EAX implementation, encrypt a block of memory, by Tom St Denis |
| */ |
| #include "tomcrypt_private.h" |
| |
| #ifdef LTC_EAX_MODE |
| |
| /** |
| EAX encrypt and produce an authentication tag |
| @param cipher The index of the cipher desired |
| @param key The secret key to use |
| @param keylen The length of the secret key (octets) |
| @param nonce The session nonce [use once] |
| @param noncelen The length of the nonce |
| @param header The header for the session |
| @param headerlen The length of the header (octets) |
| @param pt The plaintext |
| @param ptlen The length of the plaintext (octets) |
| @param ct [out] The ciphertext |
| @param tag [out] The destination tag |
| @param taglen [in/out] The max size and resulting size of the authentication tag |
| @return CRYPT_OK if successful |
| */ |
| int eax_encrypt_authenticate_memory(int cipher, |
| const unsigned char *key, unsigned long keylen, |
| const unsigned char *nonce, unsigned long noncelen, |
| const unsigned char *header, unsigned long headerlen, |
| const unsigned char *pt, unsigned long ptlen, |
| unsigned char *ct, |
| unsigned char *tag, unsigned long *taglen) |
| { |
| int err; |
| eax_state *eax; |
| |
| LTC_ARGCHK(key != NULL); |
| LTC_ARGCHK(pt != NULL); |
| LTC_ARGCHK(ct != NULL); |
| LTC_ARGCHK(tag != NULL); |
| LTC_ARGCHK(taglen != NULL); |
| |
| eax = XMALLOC(sizeof(*eax)); |
| |
| if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| if ((err = eax_encrypt(eax, pt, ct, ptlen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| err = CRYPT_OK; |
| LBL_ERR: |
| #ifdef LTC_CLEAN_STACK |
| zeromem(eax, sizeof(*eax)); |
| #endif |
| |
| XFREE(eax); |
| |
| return err; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |