Lib: Add Blake2s and Blake2b hash functions

The Babel MAC authentication RFC recommends implementing Blake2s as one of
the supported algorithms. In order to achieve do this, add the blake2b and
blake2s hash functions for MAC authentication. The hashing function
implementations are the reference implementations from blake2.net.

The Blake2 algorithms allow specifying an arbitrary output size, and the
Babel MAC spec says to implement Blake2s with 128-bit output. To satisfy
this, we add two different variants of each of the algorithms, one using
the default size (256 bits for Blake2s, 512 bits for Blake2b), and one
using half the default output size.

Update to BIRD coding style done by committer.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/mac.h b/lib/mac.h
index b6f3af52..a03e0546 100644
--- a/lib/mac.h
+++ b/lib/mac.h
@@ -12,6 +12,7 @@
 
 #include "nest/bird.h"
 #include "lib/sha512.h"
+#include "lib/blake2.h"
 
 
 #define ALG_UNDEFINED		0
@@ -21,6 +22,10 @@
 #define ALG_SHA256		0x04
 #define ALG_SHA384		0x05
 #define ALG_SHA512		0x06
+#define ALG_BLAKE2S_128		0x07
+#define ALG_BLAKE2S_256		0x08
+#define ALG_BLAKE2B_256		0x09
+#define ALG_BLAKE2B_512		0x0A
 #define ALG_HMAC		0x10
 #define ALG_HMAC_MD5		0x11
 #define ALG_HMAC_SHA1		0x12
@@ -71,6 +76,8 @@ union mac_context_union {
   struct mac_context mac;
   struct nrmh_context nrmh;
   struct hmac_context hmac;
+  struct blake2s_context blake2s;
+  struct blake2b_context blake2b;
 };