Certificate Transparency: Code for unpacking EV cert hashes whitelist

net/cert/x509_certificate_ios.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 <CommonCrypto/CommonDigest.h>
 #include <Security/Security.h>
 
 #include <cert.h>
@@ skipping 168 matching lines @@
   if (!cert_data)
     return sha1;
   DCHECK(CFDataGetBytePtr(cert_data));
   DCHECK_NE(0, CFDataGetLength(cert_data));
   CC_SHA1(CFDataGetBytePtr(cert_data), CFDataGetLength(cert_data), sha1.data);
 
   return sha1;
 }
 
 // static
+SHA256HashValue X509Certificate::CalculateFingerprint256(OSCertHandle cert) {
+  SHA256HashValue sha256;
+  memset(sha256.data, 0, sizeof(sha256.data));
+
+  ScopedCFTypeRef<CFDataRef> cert_data(SecCertificateCopyData(cert));
+  if (!cert_data)
+    return sha256;
+  DCHECK(CFDataGetBytePtr(cert_data));
+  DCHECK_NE(0, CFDataGetLength(cert_data));
+  CC_SHA256(
+      CFDataGetBytePtr(cert_data), CFDataGetLength(cert_data), sha256.data);
+
+  return sha256;
+}
+
+// static
 SHA1HashValue X509Certificate::CalculateCAFingerprint(
     const OSCertHandles& intermediates) {
   SHA1HashValue sha1;
   memset(sha1.data, 0, sizeof(sha1.data));
 
   // The CC_SHA(3cc) man page says all CC_SHA1_xxx routines return 1, so
   // we don't check their return values.
   CC_SHA1_CTX sha1_ctx;
   CC_SHA1_Init(&sha1_ctx);
   for (size_t i = 0; i < intermediates.size(); ++i) {
@@ skipping 29 matching lines @@
 
 // static
 void X509Certificate::GetPublicKeyInfo(OSCertHandle cert_handle,
                                        size_t* size_bits,
                                        PublicKeyType* type) {
   x509_util_ios::NSSCertificate nss_cert(cert_handle);
   x509_util::GetPublicKeyInfo(nss_cert.cert_handle(), size_bits, type);
 }
 
 }  // namespace net