Update from https://crrev.com/304121

net/quic/test_tools/crypto_test_utils_openssl.cc

 // Copyright 2013 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/quic/test_tools/crypto_test_utils.h"
 
 #include <openssl/bn.h>
 #include <openssl/ec.h>
 #include <openssl/ecdsa.h>
 #include <openssl/evp.h>
@@ skipping 46 matching lines @@
     uint8* derp = der_sig.get();
     crypto::ScopedECDSA_SIG sig(
         d2i_ECDSA_SIG(nullptr, const_cast<const uint8**>(&derp), sig_len));
     if (sig.get() == nullptr) {
       return false;
     }
 
     // The signature consists of a pair of 32-byte numbers.
     static const size_t kSignatureLength = 32 * 2;
     scoped_ptr<uint8[]> signature(new uint8[kSignatureLength]);
-    memset(signature.get(), 0, kSignatureLength);
-    BN_bn2bin(sig.get()->r, signature.get() + 32 - BN_num_bytes(sig.get()->r));
-    BN_bn2bin(sig.get()->s, signature.get() + 64 - BN_num_bytes(sig.get()->s));
+    if (!BN_bn2bin_padded(&signature[0], 32, sig->r) ||
+        !BN_bn2bin_padded(&signature[32], 32, sig->s)) {
+      return false;
+    }
 
     *out_signature = string(reinterpret_cast<char*>(signature.get()),
                             kSignatureLength);
 
     return true;
   }
 
   string SerializeKey() const override {
     // i2d_PublicKey will produce an ANSI X9.62 public key which, for a P-256
     // key, is 0x04 (meaning uncompressed) followed by the x and y field
@@ skipping 77 matching lines @@
 };
 
 // static
 ChannelIDSource* CryptoTestUtils::ChannelIDSourceForTesting() {
   return new TestChannelIDSource();
 }
 
 }  // namespace test
 
 }  // namespace net