Add support for MD2, MD4, and MD5 to SignatureAlgorithm.

net/cert/internal/parse_ocsp.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/sha1.h"
 #include "base/time/time.h"
 #include "crypto/sha2.h"
 #include "net/cert/internal/cert_errors.h"
@@ skipping 440 matching lines @@
 bool CheckCertID(const der::Input& id_tlv,
                  const ParsedTbsCertificate& certificate,
                  const ParsedTbsCertificate& issuer,
                  const der::Input& serial_number) {
   OCSPCertID id;
   if (!ParseOCSPCertID(id_tlv, &id))
     return false;
 
   HashValueTag type = HASH_VALUE_SHA1;
   switch (id.hash_algorithm) {
+    case DigestAlgorithm::Md2:
+    case DigestAlgorithm::Md4:
+    case DigestAlgorithm::Md5:
+      // Unsupported.
+      return false;
     case DigestAlgorithm::Sha1:
       type = HASH_VALUE_SHA1;
       break;
     case DigestAlgorithm::Sha256:
       type = HASH_VALUE_SHA256;
       break;
     case DigestAlgorithm::Sha384:
     case DigestAlgorithm::Sha512:
       NOTIMPLEMENTED();
       return false;
@@ skipping 84 matching lines @@
                                         &earliest_this_update)) {
     return false;
   }
   if (response.this_update < earliest_this_update)
     return false;  // Response is too old.
 
   return true;
 }
 
 }  // namespace net