Support SHA-256 in public key pins for HTTPS.

chrome/browser/net/transport_security_persister.cc

Index: chrome/browser/net/transport_security_persister.cc
===================================================================
--- chrome/browser/net/transport_security_persister.cc	(revision 141792)
+++ chrome/browser/net/transport_security_persister.cc	(working copy)
@@ -21,6 +21,7 @@
 
 using content::BrowserThread;
 using net::Fingerprint;
+using net::FingerprintTag;
 using net::FingerprintVector;
 using net::TransportSecurityState;
 
@@ -31,11 +32,24 @@
 
   for (FingerprintVector::const_iterator i = hashes.begin();
        i != hashes.end(); ++i) {
-    std::string hash_str(reinterpret_cast<const char*>(i->data),
-                         sizeof(i->data));
+    std::string label;
+    switch (i->tag) {
+      case net::FINGERPRINT_SHA1:
+        label = "sha1/";
+        break;
+      case net::FINGERPRINT_SHA256:
+        label = "sha256/";
+        break;
+      default:
+        LOG(WARNING) << "Skipping invalid fingerprint with unknown type "
+                     << i->tag;
+        continue;
+    }
+
+    std::string hash_str(reinterpret_cast<const char*>(i->data()), i->size());
     std::string b64;
     base::Base64Encode(hash_str, &b64);
-    pins->Append(new StringValue("sha1/" + b64));
+    pins->Append(new StringValue(label + b64));
   }
 
   return pins;