security: add support for BLAKE2 hash function

Requires openssl >= 1.1.0

Change-Id: I680c948d23561cee8cb62eb8bf757e55bf70abca
diff --git a/src/security/security-common.cpp b/src/security/security-common.cpp
index 5cfe551..5e5fa31 100644
--- a/src/security/security-common.cpp
+++ b/src/security/security-common.cpp
@@ -85,6 +85,10 @@
       return os << "SHA384";
     case DigestAlgorithm::SHA512:
       return os << "SHA512";
+    case DigestAlgorithm::BLAKE2B_512:
+      return os << "BLAKE2b-512";
+    case DigestAlgorithm::BLAKE2S_256:
+      return os << "BLAKE2s-256";
   }
   return os << static_cast<int>(algorithm);
 }