Add Poly1305 MAC

* cipher/Makefile.am: Add 'mac-poly1305.c', 'poly1305.c' and
'poly1305-internal.h'.
* cipher/mac-internal.h (poly1305mac_context_s): New.
(gcry_mac_handle): Add 'u.poly1305mac'.
(_gcry_mac_type_spec_poly1305mac): New.
* cipher/mac-poly1305.c: New.
* cipher/mac.c (mac_list): Add Poly1305.
* cipher/poly1305-internal.h: New.
* cipher/poly1305.c: New.
* src/gcrypt.h.in: Add 'GCRY_MAC_POLY1305'.
* tests/basic.c (check_mac): Add Poly1035 test vectors; Allow
overriding lengths of data and key buffers.
* tests/bench-slope.c (mac_bench): Increase max algo number from 500 to
600.
* tests/benchmark.c (mac_bench): Ditto.
--

Patch adds Bernstein's Poly1305 message authentication code to libgcrypt.
Implementation is based on Andrew Moon's public domain implementation
from: https://github.com/floodyberry/poly1305-opt

The algorithm added by this patch is the plain Poly1305 without AES and
takes 32-bit key that must not be reused.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

1 files changed, 16 insertions, 1 deletions

diff --git a/cipher/mac-internal.h b/cipher/mac-internal.h
index 9895a548..81b6185d 100644
--- a/cipher/mac-internal.h
+++ b/cipher/mac-internal.h
@@ -17,9 +17,17 @@
  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <config.h>
+
+#include "g10lib.h"
+
+
 /* The data object used to hold a handle to an encryption object.  */
 struct gcry_mac_handle;
 
+/* The data object used to hold poly1305-mac context.  */
+struct poly1305mac_context_s;
+
 
 /*
  *
@@ -84,7 +92,6 @@ typedef struct gcry_mac_spec
 } gcry_mac_spec_t;
 
 
-
 /* The handle structure.  */
 struct gcry_mac_handle
 {
@@ -106,6 +113,9 @@ struct gcry_mac_handle
       gcry_cipher_hd_t ctx;
       int cipher_algo;
     } gmac;
+    struct {
+      struct poly1305mac_context_s *ctx;
+    } poly1305mac;
   } u;
 };
 
@@ -202,3 +212,8 @@ extern gcry_mac_spec_t _gcry_mac_type_spec_gmac_seed;
 #if USE_CAMELLIA
 extern gcry_mac_spec_t _gcry_mac_type_spec_gmac_camellia;
 #endif
+
+/*
+ * The Poly1305 MAC algorithm specifications (mac-poly1305.c).
+ */
+extern gcry_mac_spec_t _gcry_mac_type_spec_poly1305mac;