| // 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. |
| */ |
| #include "tomcrypt_private.h" |
| |
| /** |
| @file omac_file.c |
| OMAC1 support, process a file, Tom St Denis |
| */ |
| |
| #ifdef LTC_OMAC |
| |
| /** |
| OMAC a file |
| @param cipher The index of the cipher desired |
| @param key The secret key |
| @param keylen The length of the secret key (octets) |
| @param filename The name of the file you wish to OMAC |
| @param out [out] Where the authentication tag is to be stored |
| @param outlen [in/out] The max size and resulting size of the authentication tag |
| @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled |
| */ |
| int omac_file(int cipher, |
| const unsigned char *key, unsigned long keylen, |
| const char *filename, |
| unsigned char *out, unsigned long *outlen) |
| { |
| #ifdef LTC_NO_FILE |
| LTC_UNUSED_PARAM(cipher); |
| LTC_UNUSED_PARAM(key); |
| LTC_UNUSED_PARAM(keylen); |
| LTC_UNUSED_PARAM(filename); |
| LTC_UNUSED_PARAM(out); |
| LTC_UNUSED_PARAM(outlen); |
| return CRYPT_NOP; |
| #else |
| size_t x; |
| int err; |
| omac_state omac; |
| FILE *in; |
| unsigned char *buf; |
| |
| LTC_ARGCHK(key != NULL); |
| LTC_ARGCHK(filename != NULL); |
| LTC_ARGCHK(out != NULL); |
| LTC_ARGCHK(outlen != NULL); |
| |
| if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) { |
| return CRYPT_MEM; |
| } |
| |
| if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| in = fopen(filename, "rb"); |
| if (in == NULL) { |
| err = CRYPT_FILE_NOTFOUND; |
| goto LBL_ERR; |
| } |
| |
| do { |
| x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in); |
| if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) { |
| fclose(in); |
| goto LBL_CLEANBUF; |
| } |
| } while (x == LTC_FILE_READ_BUFSIZE); |
| |
| if (fclose(in) != 0) { |
| err = CRYPT_ERROR; |
| goto LBL_CLEANBUF; |
| } |
| |
| err = omac_done(&omac, out, outlen); |
| |
| LBL_CLEANBUF: |
| zeromem(buf, LTC_FILE_READ_BUFSIZE); |
| LBL_ERR: |
| #ifdef LTC_CLEAN_STACK |
| zeromem(&omac, sizeof(omac_state)); |
| #endif |
| XFREE(buf); |
| return err; |
| #endif |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |