X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fmac%2Fhmac%2Fhmac_file.c;fp=libtomcrypt%2Fsrc%2Fmac%2Fhmac%2Fhmac_file.c;h=0e1a1631093ea5971f62fdb2de711b43250282ca;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/mac/hmac/hmac_file.c b/libtomcrypt/src/mac/hmac/hmac_file.c
new file mode 100644
index 0000000..0e1a163
--- /dev/null
+++ b/libtomcrypt/src/mac/hmac/hmac_file.c
@@ -0,0 +1,100 @@
+/* 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: $Format:%ai$ */