Add error information to VerifySignedData().

components/cast_certificate/cast_crl.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 "components/cast_certificate/cast_crl.h"
 
 #include <unordered_map>
 #include <unordered_set>
 
 #include "base/base64.h"
@@ skipping 107 matching lines @@
   }
 
   // Wrap the signature in a BitString.
   net::der::BitString signature_value_bit_string = net::der::BitString(
       net::der::Input(base::StringPiece(crl.signature())), 0);
 
   // Verify the signature.
   auto signature_policy = CreateCastSignaturePolicy();
   std::unique_ptr<net::SignatureAlgorithm> signature_algorithm_type =
       net::SignatureAlgorithm::CreateRsaPkcs1(net::DigestAlgorithm::Sha256);
+  net::CertErrors errors;
   if (!VerifySignedData(*signature_algorithm_type,
                         net::der::Input(&crl.tbs_crl()),
                         signature_value_bit_string, parsed_cert->tbs().spki_tlv,
-                        signature_policy.get())) {
+                        signature_policy.get(), &errors)) {
+    // TODO(634443): Dump the error information.
     VLOG(2) << "CRL - Signature verification failed.";
     return false;
   }
 
   // Verify the issuer certificate.
   net::der::GeneralizedTime verification_time;
   if (!net::der::EncodeTimeAsGeneralizedTime(time, &verification_time)) {
     VLOG(2) << "CRL - Unable to parse verification time.";
     return false;
   }
@@ skipping 210 matching lines @@
 }
 
 std::unique_ptr<CastCRL> ParseAndVerifyCRLForTest(
     const std::string& crl_proto,
     const base::Time& time,
     net::TrustStore* trust_store) {
   return ParseAndVerifyCRL(crl_proto, time, trust_store);
 }
 
 }  // namespace cast_certificate