88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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/**
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@file omac_file.c
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OMAC1 support, process a file, Tom St Denis
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*/
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#ifdef LTC_OMAC
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/**
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OMAC a file
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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 filename The name of the file you wish to OMAC
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@param out [out] Where the authentication tag is to be stored
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@param outlen [in/out] The max size and resulting size of the authentication tag
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@return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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*/
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int omac_file(int cipher,
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const unsigned char *key, unsigned long keylen,
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const char *filename,
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unsigned char *out, unsigned long *outlen)
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{
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#ifdef LTC_NO_FILE
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LTC_UNUSED_PARAM(cipher);
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LTC_UNUSED_PARAM(key);
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LTC_UNUSED_PARAM(keylen);
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LTC_UNUSED_PARAM(filename);
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LTC_UNUSED_PARAM(out);
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LTC_UNUSED_PARAM(outlen);
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return CRYPT_NOP;
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#else
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size_t x;
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int err;
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omac_state omac;
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FILE *in;
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unsigned char *buf;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(filename != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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return CRYPT_MEM;
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}
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if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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in = fopen(filename, "rb");
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if (in == NULL) {
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err = CRYPT_FILE_NOTFOUND;
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goto LBL_ERR;
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}
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do {
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x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) {
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fclose(in);
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goto LBL_CLEANBUF;
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}
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} while (x == LTC_FILE_READ_BUFSIZE);
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if (fclose(in) != 0) {
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err = CRYPT_ERROR;
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goto LBL_CLEANBUF;
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}
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err = omac_done(&omac, out, outlen);
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LBL_CLEANBUF:
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zeromem(buf, LTC_FILE_READ_BUFSIZE);
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(&omac, sizeof(omac_state));
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#endif
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XFREE(buf);
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return err;
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#endif
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}
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#endif
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