Land Recent QUIC changes.

net/quic/crypto/channel_id_openssl.cc

+// Copyright (c) 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/crypto/channel_id.h"
+
+#include <openssl/bn.h>
+#include <openssl/ec.h>
+#include <openssl/ecdsa.h>
+#include <openssl/obj_mac.h>
+#include <openssl/sha.h>
+
+#include "crypto/openssl_util.h"
+
+using base::StringPiece;
+
+namespace net {
+
+// static
+bool ChannelIDVerifier::Verify(StringPiece key,
+                               StringPiece signed_data,
+                               StringPiece signature) {
+  if (key.size() != 32 * 2 ||
+      signature.size() != 32 * 2) {
+    return false;
+  }
+
+  crypto::ScopedOpenSSL<EC_GROUP, EC_GROUP_free> p256(
+      EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1));
+  if (p256.get() == NULL) {
+    return false;
+  }
+
+  crypto::ScopedOpenSSL<BIGNUM, BN_free> x(BN_new()), y(BN_new()),
+                                         r(BN_new()), s(BN_new());
+
+  ECDSA_SIG sig;
+  sig.r = r.get();
+  sig.s = s.get();
+
+  const uint8* key_bytes = reinterpret_cast<const uint8*>(key.data());
+  const uint8* proof_bytes = reinterpret_cast<const uint8*>(signature.data());
+
+  if (BN_bin2bn(key_bytes   +  0, 32, x.get()) == NULL ||
+      BN_bin2bn(key_bytes   + 32, 32, y.get()) == NULL ||
+      BN_bin2bn(proof_bytes +  0, 32, sig.r) == NULL ||
+      BN_bin2bn(proof_bytes + 32, 32, sig.s) == NULL) {
+    return false;
+  }
+
+  crypto::ScopedOpenSSL<EC_POINT, EC_POINT_free> point(
+      EC_POINT_new(p256.get()));
+  if (point.get() == NULL ||
+      !EC_POINT_set_affine_coordinates_GFp(p256.get(), point.get(), x.get(),
+                                           y.get(), NULL)) {
+    return false;
+  }
+
+  crypto::ScopedOpenSSL<EC_KEY, EC_KEY_free> ecdsa_key(EC_KEY_new());
+  if (ecdsa_key.get() == NULL ||
+      !EC_KEY_set_group(ecdsa_key.get(), p256.get()) ||
+      !EC_KEY_set_public_key(ecdsa_key.get(), point.get())) {
+    return false;
+  }
+
+  SHA256_CTX sha256;
+  SHA256_Init(&sha256);
+  SHA256_Update(&sha256, ChannelIDVerifier::kContextStr,
+                strlen(ChannelIDVerifier::kContextStr) + 1);
+  SHA256_Update(&sha256, ChannelIDVerifier::kClientToServerStr,
+                strlen(ChannelIDVerifier::kClientToServerStr) + 1);
+  SHA256_Update(&sha256, signed_data.data(), signed_data.size());
+
+  unsigned char digest[SHA256_DIGEST_LENGTH];
+  SHA256_Final(digest, &sha256);
+
+  return ECDSA_do_verify(digest, sizeof(digest), &sig, ecdsa_key.get()) == 1;
+}
+
+}  // namespace net