1 files changed, 185 insertions, 0 deletions
diff --git a/plugins/MirOTR/Libgcrypt/cipher/mac-gmac.c b/plugins/MirOTR/Libgcrypt/cipher/mac-gmac.c
new file mode 100644
index 0000000000..18d56b5caa
--- /dev/null
+++ b/plugins/MirOTR/Libgcrypt/cipher/mac-gmac.c
@@ -0,0 +1,185 @@
+/* mac-gmac.c  -  GMAC glue for MAC API
+ * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "g10lib.h"
+#include "cipher.h"
+#include "./mac-internal.h"
+
+
+static int
+map_mac_algo_to_cipher (int mac_algo)
+{
+  switch (mac_algo)
+    {
+    default:
+      return GCRY_CIPHER_NONE;
+    case GCRY_MAC_GMAC_AES:
+      return GCRY_CIPHER_AES;
+    case GCRY_MAC_GMAC_CAMELLIA:
+      return GCRY_CIPHER_CAMELLIA128;
+    case GCRY_MAC_GMAC_TWOFISH:
+      return GCRY_CIPHER_TWOFISH;
+    case GCRY_MAC_GMAC_SERPENT:
+      return GCRY_CIPHER_SERPENT128;
+    case GCRY_MAC_GMAC_SEED:
+      return GCRY_CIPHER_SEED;
+    }
+}
+
+
+static gcry_err_code_t
+gmac_open (gcry_mac_hd_t h)
+{
+  gcry_err_code_t err;
+  gcry_cipher_hd_t hd;
+  int secure = (h->magic == CTX_MAGIC_SECURE);
+  int cipher_algo;
+  unsigned int flags;
+
+  cipher_algo = map_mac_algo_to_cipher (h->spec->algo);
+  flags = (secure ? GCRY_CIPHER_SECURE : 0);
+
+  err = _gcry_cipher_open_internal (&hd, cipher_algo, GCRY_CIPHER_MODE_GCM,
+                                    flags);
+  if (err)
+    return err;
+
+  h->u.gmac.cipher_algo = cipher_algo;
+  h->u.gmac.ctx = hd;
+  return 0;
+}
+
+
+static void
+gmac_close (gcry_mac_hd_t h)
+{
+  _gcry_cipher_close (h->u.gmac.ctx);
+  h->u.gmac.ctx = NULL;
+}
+
+
+static gcry_err_code_t
+gmac_setkey (gcry_mac_hd_t h, const unsigned char *key, size_t keylen)
+{
+  return _gcry_cipher_setkey (h->u.gmac.ctx, key, keylen);
+}
+
+
+static gcry_err_code_t
+gmac_setiv (gcry_mac_hd_t h, const unsigned char *iv, size_t ivlen)
+{
+  return _gcry_cipher_setiv (h->u.gmac.ctx, iv, ivlen);
+}
+
+
+static gcry_err_code_t
+gmac_reset (gcry_mac_hd_t h)
+{
+  return _gcry_cipher_reset (h->u.gmac.ctx);
+}
+
+
+static gcry_err_code_t
+gmac_write (gcry_mac_hd_t h, const unsigned char *buf, size_t buflen)
+{
+  return _gcry_cipher_authenticate (h->u.gmac.ctx, buf, buflen);
+}
+
+
+static gcry_err_code_t
+gmac_read (gcry_mac_hd_t h, unsigned char *outbuf, size_t * outlen)
+{
+  if (*outlen > GCRY_GCM_BLOCK_LEN)
+    *outlen = GCRY_GCM_BLOCK_LEN;
+  return _gcry_cipher_gettag (h->u.gmac.ctx, outbuf, *outlen);
+}
+
+
+static gcry_err_code_t
+gmac_verify (gcry_mac_hd_t h, const unsigned char *buf, size_t buflen)
+{
+  return _gcry_cipher_checktag (h->u.gmac.ctx, buf, buflen);
+}
+
+
+static unsigned int
+gmac_get_maclen (int algo)
+{
+  (void)algo;
+  return GCRY_GCM_BLOCK_LEN;
+}
+
+
+static unsigned int
+gmac_get_keylen (int algo)
+{
+  return _gcry_cipher_get_algo_keylen (map_mac_algo_to_cipher (algo));
+}
+
+
+static gcry_mac_spec_ops_t gmac_ops = {
+  gmac_open,
+  gmac_close,
+  gmac_setkey,
+  gmac_setiv,
+  gmac_reset,
+  gmac_write,
+  gmac_read,
+  gmac_verify,
+  gmac_get_maclen,
+  gmac_get_keylen
+};
+
+
+#if USE_AES
+gcry_mac_spec_t _gcry_mac_type_spec_gmac_aes = {
+  GCRY_MAC_GMAC_AES, {0, 1}, "GMAC_AES",
+  &gmac_ops
+};
+#endif
+#if USE_TWOFISH
+gcry_mac_spec_t _gcry_mac_type_spec_gmac_twofish = {
+  GCRY_MAC_GMAC_TWOFISH, {0, 0}, "GMAC_TWOFISH",
+  &gmac_ops
+};
+#endif
+#if USE_SERPENT
+gcry_mac_spec_t _gcry_mac_type_spec_gmac_serpent = {
+  GCRY_MAC_GMAC_SERPENT, {0, 0}, "GMAC_SERPENT",
+  &gmac_ops
+};
+#endif
+#if USE_SEED
+gcry_mac_spec_t _gcry_mac_type_spec_gmac_seed = {
+  GCRY_MAC_GMAC_SEED, {0, 0}, "GMAC_SEED",
+  &gmac_ops
+};
+#endif
+#if USE_CAMELLIA
+gcry_mac_spec_t _gcry_mac_type_spec_gmac_camellia = {
+  GCRY_MAC_GMAC_CAMELLIA, {0, 0}, "GMAC_CAMELLIA",
+  &gmac_ops
+};
+#endif