--- /dev/null
+/* 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.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: $Format:%ai$ */