Certificate Transparency: Code for unpacking EV cert hashes whitelist

net/cert/x509_certificate_win.cc

 // Copyright (c) 2012 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 "net/cert/x509_certificate.h"
 
 #include <blapi.h>  // Implement CalculateChainFingerprint() with NSS.
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 295 matching lines @@
   SHA1HashValue sha1;
   DWORD sha1_size = sizeof(sha1.data);
   rv = CryptHashCertificate(NULL, CALG_SHA1, 0, cert->pbCertEncoded,
                             cert->cbCertEncoded, sha1.data, &sha1_size);
   DCHECK(rv && sha1_size == sizeof(sha1.data));
   if (!rv)
     memset(sha1.data, 0, sizeof(sha1.data));
   return sha1;
 }
 
+// static
+SHA256HashValue X509Certificate::CalculateFingerprint256(OSCertHandle cert) {
+  DCHECK(NULL != cert->pbCertEncoded);
+  DCHECK_NE(static_cast<DWORD>(0), cert->cbCertEncoded);
+
+  BOOL rv;
+  SHA256HashValue sha256;
+  DWORD sha256_size = sizeof(sha256.data);
+  rv = CryptHashCertificate(NULL,
+                            CALG_SHA_256,
+                            0,
+                            cert->pbCertEncoded,
+                            cert->cbCertEncoded,
+                            sha256.data,
+                            &sha256_size);
+  DCHECK(rv && sha256_size == sizeof(sha256.data));
+  if (!rv)
+    memset(sha256.data, 0, sizeof(sha256.data));
+  return sha256;
+}
+
 // TODO(wtc): This function is implemented with NSS low-level hash
 // functions to ensure it is fast.  Reimplement this function with
 // CryptoAPI.  May need to cache the HCRYPTPROV to reduce the overhead.
 // static
 SHA1HashValue X509Certificate::CalculateCAFingerprint(
     const OSCertHandles& intermediates) {
   SHA1HashValue sha1;
   memset(sha1.data, 0, sizeof(sha1.data));
 
   SHA1Context* sha1_ctx = SHA1_NewContext();
@@ skipping 119 matching lines @@
     if (IsCertNameBlobInIssuerList(&(*it)->pCertInfo->Issuer,
                                    valid_issuers)) {
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace net