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- // Copyright 2015 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 "components/gcm_driver/crypto/gcm_crypto_test_helpers.h"
- #include <stddef.h>
- #include <sstream>
- #include <string>
- #include "base/base64url.h"
- #include "base/strings/string_util.h"
- #include "components/gcm_driver/common/gcm_message.h"
- #include "components/gcm_driver/crypto/gcm_message_cryptographer.h"
- #include "components/gcm_driver/crypto/p256_key_util.h"
- #include "crypto/ec_private_key.h"
- #include "crypto/random.h"
- namespace gcm {
- bool CreateEncryptedPayloadForTesting(const base::StringPiece& payload,
- const base::StringPiece& peer_public_key,
- const base::StringPiece& auth_secret,
- IncomingMessage* message) {
- DCHECK(message);
- // Create an ephemeral key for the sender.
- std::unique_ptr<crypto::ECPrivateKey> key = crypto::ECPrivateKey::Create();
- if (!key)
- return false;
- std::string shared_secret;
- // Calculate the shared secret between the sender and its peer.
- if (!ComputeSharedP256Secret(*key, peer_public_key, &shared_secret)) {
- return false;
- }
- std::string salt;
- // Generate a cryptographically secure random salt for the message.
- const size_t salt_size = GCMMessageCryptographer::kSaltSize;
- crypto::RandBytes(base::WriteInto(&salt, salt_size + 1), salt_size);
- GCMMessageCryptographer cryptographer(
- GCMMessageCryptographer::Version::DRAFT_03);
- size_t record_size;
- std::string ciphertext;
- std::string public_key;
- if (!GetRawPublicKey(*key, &public_key))
- return false;
- if (!cryptographer.Encrypt(peer_public_key, public_key, shared_secret,
- auth_secret, salt, payload, &record_size,
- &ciphertext)) {
- return false;
- }
- std::string encoded_salt, encoded_public_key;
- // Create base64url encoded representations of the salt and local public key.
- base::Base64UrlEncode(salt, base::Base64UrlEncodePolicy::OMIT_PADDING,
- &encoded_salt);
- base::Base64UrlEncode(public_key, base::Base64UrlEncodePolicy::OMIT_PADDING,
- &encoded_public_key);
- // Write the Encryption header value to |*message|.
- std::stringstream encryption_header;
- encryption_header << "salt=" << encoded_salt << ";rs=" << record_size;
- message->data["encryption"] = encryption_header.str();
- // Write the Crypto-Key value to |*message|.
- std::stringstream crypto_key_header;
- crypto_key_header << "dh=" << encoded_public_key;
- message->data["crypto-key"] = crypto_key_header.str();
- message->raw_data.swap(ciphertext);
- return true;
- }
- } // namespace gcm
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