--- /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 hmac_file.c
+ HMAC support, process a file, Tom St Denis/Dobes Vandermeer
+*/
+
+#ifdef LTC_HMAC
+
+/**
+ HMAC a file
+ @param hash The index of the hash you wish to use
+ @param fname The name of the file you wish to HMAC
+ @param key The secret key
+ @param keylen The length of the secret key
+ @param out [out] The HMAC authentication tag
+ @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 hmac_file(int hash, const char *fname,
+ const unsigned char *key, unsigned long keylen,
+ unsigned char *out, unsigned long *outlen)
+{
+#ifdef LTC_NO_FILE
+ LTC_UNUSED_PARAM(hash);
+ LTC_UNUSED_PARAM(fname);
+ LTC_UNUSED_PARAM(key);
+ LTC_UNUSED_PARAM(keylen);
+ LTC_UNUSED_PARAM(out);
+ LTC_UNUSED_PARAM(outlen);
+ return CRYPT_NOP;
+#else
+ hmac_state hmac;
+ FILE *in;
+ unsigned char *buf;
+ size_t x;
+ int err;
+
+ LTC_ARGCHK(fname != NULL);
+ LTC_ARGCHK(key != NULL);
+ LTC_ARGCHK(out != NULL);
+ LTC_ARGCHK(outlen != NULL);
+
+ if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
+ return CRYPT_MEM;
+ }
+
+ if ((err = hash_is_valid(hash)) != CRYPT_OK) {
+ goto LBL_ERR;
+ }
+
+ if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
+ goto LBL_ERR;
+ }
+
+ in = fopen(fname, "rb");
+ if (in == NULL) {
+ err = CRYPT_FILE_NOTFOUND;
+ goto LBL_ERR;
+ }
+
+ do {
+ x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
+ if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
+ fclose(in); /* we don't trap this error since we're already returning an error! */
+ goto LBL_CLEANBUF;
+ }
+ } while (x == LTC_FILE_READ_BUFSIZE);
+
+ if (fclose(in) != 0) {
+ err = CRYPT_ERROR;
+ goto LBL_CLEANBUF;
+ }
+
+ err = hmac_done(&hmac, out, outlen);
+
+LBL_CLEANBUF:
+ zeromem(buf, LTC_FILE_READ_BUFSIZE);
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+ zeromem(&hmac, sizeof(hmac_state));
+#endif
+ XFREE(buf);
+ return err;
+#endif
+}
+
+#endif
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */