gc: support HMAC-SHA256 and HMAC-SHA512.

* lib/gc.h: Add gc_hmac_sha256 and gc_hmac_sha512.
* lib/gc-libgcrypt.c (gc_hmac_sha256, gc_hmac_sha512): New
functions.
(gc_hmac_md5): Use symbolic constant.
* lib/gc-gnulib.c: Include hmac.h for HMAC-SHA256/512 too.
(gc_hmac_sha256, gc_hmac_sha512): New functions.
* lib/hmac.h: Add hmac_sha256 and hmac_sha512 prototypes.
* m4/sha256.m4: Protect against empty expansion.
* m4/sha512.m4: Likewise.
* lib/hmac-sha256.c: New file.
* lib/hmac-sha512.c: Likewise.
* m4/gc-hmac-sha256.m4: Likewise.
* m4/gc-hmac-sha512.m4: Likewise.
* m4/gc-sha256.m4: Likewise.
* m4/gc-sha512.m4: Likewise.
* modules/crypto/gc-hmac-sha256: Likewise.
* modules/crypto/gc-hmac-sha256-tests: Likewise.
* modules/crypto/gc-hmac-sha512: Likewise.
* modules/crypto/gc-hmac-sha512-tests: Likewise.
* modules/crypto/hmac-sha256: Likewise.
* modules/crypto/hmac-sha256-tests: Likewise.
* modules/crypto/hmac-sha512: Likewise.
* modules/crypto/hmac-sha512-tests: Likewise.
* tests/test-gc-hmac-sha256.c: Likewise.
* tests/test-gc-hmac-sha512.c: Likewise
* tests/test-hmac-sha256.c: Likewise.
* tests/test-hmac-sha512.c: Likewise

1 files changed, 69 insertions, 0 deletions

diff --git a/tests/test-gc-hmac-sha256.c b/tests/test-gc-hmac-sha256.c
new file mode 100644
index 0000000000..edb8d7dccf
--- /dev/null
+++ b/tests/test-gc-hmac-sha256.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2005, 2010-2013 Free Software Foundation, Inc.
+ * Written by Simon Josefsson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include "gc.h"
+
+int
+main (int argc, char *argv[])
+{
+  Gc_rc rc;
+
+  rc = gc_init ();
+  if (rc != GC_OK)
+    {
+      printf ("gc_init() failed\n");
+      return 1;
+    }
+
+  {
+    char *key =
+      "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b";
+    size_t key_len = 20;
+    char *data = "Hi There";
+    size_t data_len = 8;
+    char *digest =
+      "\xb0\x34\x4c\x61\xd8\xdb\x38\x53\x5c\xa8\xaf\xce\xaf\x0b\xf1\x2b\x88\x1d\xc2\x00\xc9\x83\x3d\xa7\x26\xe9\x37\x6c\x2e\x32\xcf\xf7";
+    char out[GC_SHA256_DIGEST_SIZE];
+
+    if (gc_hmac_sha256 (key, key_len, data, data_len, out) != 0)
+      {
+        printf ("call failure\n");
+        return 1;
+      }
+
+    if (memcmp (digest, out, GC_SHA256_DIGEST_SIZE) != 0)
+      {
+        size_t i;
+        printf ("hash 1 mismatch. expected:\n");
+        for (i = 0; i < GC_SHA256_DIGEST_SIZE; i++)
+          printf ("%02x ", digest[i] & 0xFF);
+        printf ("\ncomputed:\n");
+        for (i = 0; i < GC_SHA256_DIGEST_SIZE; i++)
+          printf ("%02x ", out[i] & 0xFF);
+        printf ("\n");
+        return 1;
+      }
+  }
+
+  gc_done ();
+
+  return 0;
+}