Add hash function BLAKE2 to crypto:hash/hmac

Adds two hash functions blake2b and blake2s (64 bit hash and 32 bit hash
respectively). These are modern and standard hash functions used in
blockchains and encrypted communication protocols (e.g. Noise -
http://www.noiseprotocol.org/). The hash functions are available in
OpenSSL since version 1.1.1.

Also add test cases and mention in documentation.

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/crypto/c_src/digest.c b/lib/crypto/c_src/digest.c
index 00ba65bf54..fec286c000 100644
--- a/lib/crypto/c_src/digest.c
+++ b/lib/crypto/c_src/digest.c
@@ -82,6 +82,20 @@ static struct digest_type_t digest_types[] =
      {NULL}
 #endif
     },
+    {{"blake2b"},
+#ifdef HAVE_BLAKE2
+     {&EVP_blake2b512}
+#else
+     {NULL}
+#endif
+    },
+    {{"blake2s"},
+#ifdef HAVE_BLAKE2
+     {&EVP_blake2s256}
+#else
+     {NULL}
+#endif
+    },
 
     {{NULL}, {NULL}}
 };