Cut down on usage of deprecated APIs in //crypto.

crypto/ec_private_key_nss.cc

Index: crypto/ec_private_key_nss.cc
diff --git a/crypto/ec_private_key_nss.cc b/crypto/ec_private_key_nss.cc
index b65de955aa3265f43248e44ed39c2cc82cf29c2c..989b7ade2025996b329adfc115cbabd3515fc743 100644
--- a/crypto/ec_private_key_nss.cc
+++ b/crypto/ec_private_key_nss.cc
@@ -26,10 +26,9 @@ extern "C" {
 
 namespace {
 
-// Copied from rsa_private_key_nss.cc.
-static bool ReadAttribute(SECKEYPrivateKey* key,
-                          CK_ATTRIBUTE_TYPE type,
-                          std::vector<uint8_t>* output) {
+static bool AppendAttribute(SECKEYPrivateKey* key,
+                            CK_ATTRIBUTE_TYPE type,
+                            std::vector<uint8_t>* output) {
   SECItem item;
   SECStatus rv;
   rv = PK11_ReadRawAttribute(PK11_TypePrivKey, key, type, &item);
@@ -38,7 +37,7 @@ static bool ReadAttribute(SECKEYPrivateKey* key,
     return false;
   }
 
-  output->assign(item.data, item.data + item.len);
+  output->insert(output->end(), item.data, item.data + item.len);
   SECITEM_FreeItem(&item, PR_FALSE);
   return true;
 }
@@ -311,12 +310,14 @@ bool ECPrivateKey::ExportRawPublicKey(std::string* output) {
   return true;
 }
 
-bool ECPrivateKey::ExportValue(std::vector<uint8_t>* output) {
-  return ReadAttribute(key_, CKA_VALUE, output);
-}
-
-bool ECPrivateKey::ExportECParams(std::vector<uint8_t>* output) {
-  return ReadAttribute(key_, CKA_EC_PARAMS, output);
+bool ECPrivateKey::ExportValueForTesting(std::vector<uint8_t>* output) {
+  // This serialization format is purely for testing equality, so just
+  // concatenate the raw private key (always 32 bytes for P-256) with the
+  // parameters.
+  output->clear();
+  return AppendAttribute(key_, CKA_VALUE, output) &&
+         output->size() == 32 &&
+         AppendAttribute(key_, CKA_EC_PARAMS, output);
 }
 
 ECPrivateKey::ECPrivateKey() : key_(NULL), public_key_(NULL) {}