// Copyright 2017 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/encrypted_messages/message_encrypter.h"
#include "base/strings/string_piece.h"
#include "components/encrypted_messages/encrypted_message.pb.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/boringssl/src/include/openssl/curve25519.h"

namespace encrypted_messages {

namespace {
// This data should not be changed without also changing the
// corresponding server-side test.
const unsigned char kSerializedEncryptedMessage[] = {
    0x0A, 0xFB, 0x0C, 0xD5, 0x44, 0x21, 0x36, 0x4D, 0xFC, 0x29, 0x56, 0xBD,
    0x47, 0x18, 0xB1, 0x6F, 0x97, 0xF1, 0xF0, 0x3C, 0x31, 0x31, 0x1D, 0xD7,
    0xAB, 0x81, 0xCC, 0xBC, 0x56, 0x2B, 0xD4, 0x50, 0xF4, 0xF6, 0x28, 0x3A,
    0x36, 0x8C, 0x4A, 0x67, 0x4E, 0xF2, 0x51, 0xA3, 0x7D, 0x02, 0xA8, 0x4D,
    0xE9, 0xBE, 0x72, 0x5A, 0x8A, 0x62, 0xE0, 0x61, 0xA4, 0x87, 0x62, 0xBA,
    0x6A, 0x5C, 0x4B, 0x07, 0x04, 0xE6, 0xCD, 0xE1, 0xD6, 0x12, 0x02, 0xC1,
    0xF3, 0x5C, 0x7D, 0xFB, 0x61, 0xC3, 0x8D, 0xBE, 0x47, 0x50, 0xC4, 0xAC,
    0x33, 0xA6, 0x2B, 0x6A, 0x4D, 0x5F, 0x22, 0x4B, 0x21, 0xAB, 0xFD, 0x66,
    0x9C, 0xEF, 0x81, 0x06, 0xEB, 0xC0, 0x96, 0x87, 0x4E, 0xD6, 0x16, 0x5F,
    0x0B, 0x2E, 0xF0, 0x3C, 0xA3, 0xBF, 0x75, 0x77, 0x3A, 0x91, 0xD2, 0xF5,
    0xCC, 0x22, 0xE2, 0xB0, 0xCC, 0x28, 0xC0, 0xE2, 0xDB, 0x61, 0x5D, 0xEF,
    0x3F, 0xA9, 0x23, 0x71, 0xA1, 0xF3, 0x59, 0x4F, 0xAF, 0xBE, 0x4F, 0x2C,
    0xF6, 0xFC, 0xCB, 0x46, 0x2D, 0x48, 0x24, 0x84, 0xEC, 0x73, 0xCB, 0x83,
    0x3D, 0x2A, 0x0B, 0x9C, 0x57, 0xDC, 0xC5, 0xD9, 0xB9, 0xA2, 0x69, 0xD9,
    0x2B, 0xCF, 0xFB, 0xEB, 0xBA, 0xBC, 0x55, 0x5C, 0xF3, 0x9A, 0x66, 0x56,
    0xD2, 0x06, 0xBF, 0x07, 0x34, 0x7F, 0x84, 0x53, 0xB4, 0xB2, 0xE3, 0x52,
    0xA6, 0x97, 0x2A, 0xFD, 0x43, 0xC8, 0x33, 0xDC, 0x7F, 0xC1, 0x0E, 0xE9,
    0xA6, 0xFF, 0x88, 0x63, 0x07, 0x38, 0x2D, 0xDF, 0x36, 0x83, 0xF1, 0x42,
    0x15, 0x61, 0x05, 0x43, 0x94, 0x59, 0x67, 0x04, 0xB3, 0x8A, 0xF6, 0xFE,
    0x73, 0x03, 0xE2, 0x89, 0x20, 0xC1, 0x63, 0x49, 0x67, 0x4E, 0xAF, 0xBF,
    0xAE, 0xAC, 0xA3, 0x16, 0x8F, 0x6D, 0x2D, 0x79, 0xEA, 0x99, 0x79, 0x95,
    0x03, 0xC8, 0x05, 0x1B, 0x3E, 0x66, 0x99, 0x1E, 0xC5, 0x05, 0x34, 0xD0,
    0x99, 0xED, 0xDD, 0xFB, 0x7C, 0x9B, 0x00, 0x3B, 0x5C, 0x78, 0xD5, 0x30,
    0x76, 0x3C, 0x37, 0xED, 0x4F, 0x6A, 0xAD, 0x75, 0xA7, 0x86, 0xC4, 0x0B,
    0xD5, 0x0F, 0xE8, 0xC3, 0x4D, 0x1F, 0xAF, 0x62, 0xD8, 0xD4, 0x74, 0x02,
    0xBE, 0xD3, 0x01, 0x2F, 0x18, 0x44, 0xFB, 0xA3, 0x46, 0x5B, 0x6F, 0x4C,
    0x86, 0xD9, 0x2D, 0xE3, 0x32, 0x7F, 0xCA, 0x91, 0xFD, 0xED, 0x6A, 0xAC,
    0x1D, 0x01, 0x75, 0xFC, 0x1E, 0x36, 0x81, 0xF3, 0x66, 0x2A, 0x21, 0x0F,
    0x0F, 0x69, 0x29, 0x7B, 0x15, 0xDE, 0xE2, 0x90, 0xF1, 0x64, 0x1F, 0xF3,
    0xEC, 0x90, 0x8A, 0xFC, 0x83, 0x39, 0x7D, 0x19, 0x31, 0x7F, 0x01, 0xA0,
    0x43, 0xF9, 0x24, 0x8C, 0xDD, 0xC0, 0x15, 0x9E, 0x6A, 0x92, 0x8F, 0x65,
    0xDD, 0x60, 0x34, 0x9D, 0x73, 0x46, 0xB5, 0x31, 0xF8, 0x92, 0x79, 0xC3,
    0x59, 0x1D, 0xEB, 0xC8, 0x12, 0x92, 0xB6, 0x24, 0xA2, 0x3A, 0xA1, 0xA2,
    0xEE, 0x8E, 0x34, 0x23, 0xB2, 0x0F, 0x34, 0xA8, 0x29, 0x26, 0x1C, 0xC0,
    0xEE, 0x8C, 0xA7, 0x87, 0x9D, 0x3E, 0x74, 0x21, 0x06, 0xDA, 0xF3, 0x9E,
    0x01, 0xC3, 0xBD, 0x68, 0x40, 0x6B, 0x61, 0xA9, 0xB7, 0xC1, 0xFD, 0x56,
    0xFF, 0x99, 0x11, 0x42, 0x81, 0xFB, 0xE0, 0x9A, 0x1D, 0xD9, 0xB8, 0x1D,
    0x2D, 0x85, 0x74, 0xC1, 0xBC, 0x36, 0x8F, 0x31, 0xE5, 0x01, 0x79, 0xF5,
    0x04, 0xC5, 0x96, 0x1B, 0x5F, 0xAD, 0x86, 0x52, 0x00, 0xF0, 0xCC, 0x7B,
    0x8D, 0x1B, 0xEA, 0x6B, 0xA8, 0xF8, 0xA4, 0x8F, 0x13, 0x51, 0x3D, 0xB8,
    0x4D, 0x99, 0x22, 0x9B, 0x31, 0xB7, 0xBC, 0xF7, 0x2D, 0x76, 0x19, 0x90,
    0xAB, 0xDA, 0xD2, 0x25, 0xE7, 0x4E, 0xDF, 0x96, 0x66, 0x90, 0xD7, 0x4E,
    0xE7, 0x21, 0x96, 0xEF, 0xD0, 0xA7, 0x00, 0x2E, 0x9B, 0x2C, 0xE3, 0x87,
    0x45, 0xA4, 0x3C, 0x24, 0x5A, 0xFA, 0x3D, 0x2D, 0xAD, 0x3E, 0xD3, 0xB5,
    0x07, 0xAB, 0x72, 0x6D, 0xD1, 0x83, 0x17, 0x11, 0xD8, 0x37, 0x7D, 0x69,
    0xE1, 0x4D, 0xF6, 0x34, 0x72, 0x54, 0xCD, 0x65, 0xC0, 0x2C, 0x36, 0xA1,
    0x0A, 0x4B, 0x28, 0x24, 0x50, 0x1D, 0x36, 0x15, 0xF3, 0xD4, 0xFB, 0x75,
    0x2C, 0x72, 0xA9, 0x92, 0x34, 0xB5, 0xEF, 0x50, 0x29, 0x8D, 0x78, 0x75,
    0xB8, 0x19, 0x58, 0xC2, 0x9D, 0xD3, 0x09, 0xDC, 0xB6, 0xB6, 0x86, 0xE8,
    0xF7, 0x79, 0xBF, 0xFB, 0x7E, 0xF4, 0xD5, 0x99, 0xFF, 0xE5, 0x72, 0x1A,
    0x15, 0x9E, 0x37, 0x6A, 0x7A, 0xD1, 0xD3, 0x3D, 0xC8, 0xDC, 0x37, 0x98,
    0xE4, 0x74, 0x0B, 0x8D, 0x9D, 0x38, 0x7E, 0xA8, 0x24, 0x76, 0xA4, 0x7F,
    0x28, 0x34, 0xA9, 0xC5, 0x5F, 0xD2, 0x0C, 0xDE, 0xD0, 0x34, 0x2D, 0xF9,
    0x25, 0xE0, 0x60, 0xB2, 0x1D, 0xA8, 0x7F, 0xDB, 0x03, 0x44, 0x88, 0xA2,
    0x33, 0x75, 0x9B, 0x06, 0xAB, 0x28, 0x82, 0x74, 0x9F, 0x7F, 0xA7, 0xA6,
    0x38, 0x27, 0xFA, 0xCE, 0x75, 0xC8, 0x91, 0xE1, 0x15, 0xDD, 0x2F, 0x34,
    0xF5, 0x64, 0xFA, 0x77, 0x6D, 0x1F, 0xE7, 0x42, 0x41, 0xB5, 0xF4, 0x71,
    0x8E, 0x0A, 0x8B, 0x06, 0x00, 0xB6, 0xCB, 0xBE, 0x23, 0xC2, 0x8C, 0x83,
    0x27, 0x23, 0x8F, 0xF7, 0xA1, 0xCF, 0x5C, 0x76, 0x16, 0x9C, 0x17, 0xD1,
    0x7D, 0xA5, 0xA0, 0x55, 0xC2, 0xF7, 0x5B, 0x8B, 0x7E, 0xD7, 0x36, 0xC0,
    0x3B, 0x52, 0xF4, 0x5D, 0x96, 0x99, 0x61, 0x16, 0xFF, 0x01, 0x1D, 0x2F,
    0xC4, 0xE6, 0x3D, 0x6E, 0x1F, 0xB3, 0x2B, 0x4B, 0x9E, 0xC4, 0xD8, 0x7F,
    0x74, 0x6B, 0x5F, 0x78, 0x36, 0xE6, 0x2E, 0x46, 0xF1, 0xCF, 0x9E, 0x19,
    0xA3, 0xE1, 0x5C, 0xC8, 0x4F, 0xE5, 0x36, 0x21, 0x06, 0x1A, 0x9D, 0x7D,
    0x14, 0xBE, 0xCB, 0x1F, 0xB7, 0x8E, 0xC4, 0x98, 0xEA, 0xDC, 0xEC, 0x59,
    0xA1, 0xC6, 0x77, 0xCF, 0x2D, 0x47, 0x69, 0x29, 0x8C, 0xC3, 0xBF, 0x72,
    0xA3, 0x3F, 0x40, 0xFB, 0x11, 0xDA, 0x0C, 0x0B, 0xB4, 0x66, 0xD3, 0xDD,
    0x12, 0x7B, 0xB1, 0x6A, 0xC3, 0xF6, 0x5F, 0x0F, 0xFB, 0x6D, 0x43, 0x6B,
    0xED, 0xF9, 0x48, 0x4E, 0xAF, 0x98, 0x55, 0x1B, 0x37, 0x16, 0x2D, 0xF3,
    0x75, 0xB5, 0xAC, 0xB8, 0xF1, 0x37, 0xE8, 0xA9, 0x99, 0x35, 0x04, 0x8E,
    0x51, 0x7B, 0x29, 0x4B, 0x7A, 0xA1, 0xD2, 0x1D, 0x25, 0x62, 0xFD, 0xAF,
    0x7A, 0xBA, 0xB6, 0x05, 0x75, 0x5D, 0x94, 0x72, 0xE7, 0x02, 0x77, 0x02,
    0xAC, 0x7B, 0x91, 0x6F, 0x8C, 0x32, 0xF6, 0x38, 0x67, 0xF6, 0xF2, 0xC1,
    0x58, 0xCE, 0x01, 0x39, 0xED, 0x76, 0x52, 0x1F, 0xA2, 0x49, 0x0B, 0x72,
    0x73, 0xD9, 0x00, 0x12, 0xDC, 0xC5, 0x27, 0x8F, 0x38, 0x08, 0x31, 0x7F,
    0x08, 0xFC, 0xA8, 0x74, 0xD2, 0xED, 0xED, 0xC7, 0x37, 0xC8, 0xAF, 0xB1,
    0x2C, 0x9D, 0x33, 0x2C, 0xE1, 0x2D, 0x72, 0x59, 0xCF, 0x55, 0x1E, 0x04,
    0x51, 0x08, 0xBF, 0x98, 0x16, 0xEC, 0x1F, 0x76, 0x54, 0x5F, 0x8B, 0xD1,
    0x00, 0x07, 0x25, 0x7A, 0x0A, 0x2A, 0xD1, 0xAE, 0xC8, 0x77, 0xDF, 0xDD,
    0x14, 0xB2, 0xA6, 0xC5, 0x2E, 0xFB, 0xC7, 0x4E, 0x56, 0x01, 0xDE, 0x5B,
    0x86, 0xAC, 0xB7, 0xBB, 0x6E, 0x41, 0xFF, 0xFD, 0x29, 0x29, 0x0D, 0x95,
    0x13, 0x1E, 0x31, 0xA0, 0xFF, 0xC2, 0x2C, 0x31, 0x6B, 0xF5, 0x0D, 0x16,
    0x1E, 0x56, 0xC5, 0x1F, 0xB1, 0xB1, 0x33, 0x3D, 0xA9, 0xD4, 0x8D, 0x2A,
    0xFA, 0x9F, 0x9A, 0xA7, 0x51, 0xDC, 0x77, 0xBB, 0xD6, 0xDC, 0xAE, 0x3D,
    0xA3, 0x2F, 0xDD, 0x55, 0x52, 0xAB, 0x35, 0x61, 0x7C, 0xA8, 0x5E, 0x57,
    0xAD, 0x8D, 0xF5, 0x02, 0xA1, 0x60, 0x33, 0x9E, 0xEC, 0xD0, 0x48, 0x5C,
    0x3F, 0xDF, 0xF2, 0x33, 0xC1, 0x3A, 0x99, 0xFE, 0x37, 0x2E, 0xF8, 0xFF,
    0x49, 0x11, 0xFF, 0x8B, 0x18, 0xCF, 0x37, 0xBC, 0x50, 0xD0, 0xFB, 0x9E,
    0xFB, 0x16, 0x6D, 0xC6, 0xAC, 0x79, 0xDD, 0xE8, 0xE7, 0x69, 0x62, 0xB7,
    0x23, 0xDF, 0xA6, 0x93, 0x6E, 0x65, 0x49, 0xE5, 0x61, 0x60, 0x89, 0xDC,
    0x45, 0xC8, 0xD2, 0x4F, 0x03, 0xAA, 0x1E, 0x06, 0x19, 0x4B, 0x14, 0x12,
    0x02, 0xB9, 0xA2, 0x66, 0x02, 0xFE, 0x80, 0x03, 0xC7, 0xEF, 0x3C, 0xC9,
    0x0D, 0x85, 0xD8, 0x94, 0xF2, 0x3B, 0xC6, 0x9E, 0xB7, 0x4D, 0x19, 0x85,
    0x1A, 0xA6, 0x89, 0x12, 0x24, 0xC2, 0x16, 0x3A, 0x17, 0x1E, 0x64, 0x32,
    0x6D, 0xDA, 0x6B, 0xE0, 0x3C, 0xE9, 0xCC, 0xE1, 0xFC, 0x16, 0x9B, 0xBF,
    0x75, 0x01, 0xA4, 0x17, 0x5F, 0x49, 0xD3, 0xF7, 0xE3, 0xEF, 0x1B, 0x4D,
    0x90, 0xB1, 0x43, 0x54, 0x97, 0x57, 0xE3, 0x4B, 0x66, 0x77, 0xAA, 0x1C,
    0xA4, 0xC1, 0x6C, 0x44, 0x34, 0x93, 0x42, 0xDD, 0xC6, 0xA2, 0xBD, 0x95,
    0x84, 0x1C, 0xB5, 0xE0, 0xEC, 0x24, 0x6E, 0x64, 0x5C, 0x94, 0x81, 0x50,
    0x7E, 0x97, 0x16, 0xA8, 0x7C, 0xF3, 0x6D, 0x5A, 0x7C, 0x55, 0x71, 0x2D,
    0x3D, 0x8A, 0xCD, 0xA2, 0x9B, 0x04, 0x10, 0xEE, 0xE2, 0x2C, 0x4D, 0x50,
    0x93, 0x1F, 0xD2, 0x36, 0x05, 0x25, 0x21, 0xA6, 0x69, 0x99, 0xC8, 0x76,
    0x1B, 0x01, 0xDE, 0x9F, 0xEE, 0xE0, 0xFF, 0xAF, 0x3C, 0x0F, 0x0D, 0xF1,
    0x49, 0x83, 0x17, 0x1A, 0x88, 0x31, 0xC6, 0x10, 0xFB, 0x5C, 0xBC, 0xC7,
    0x8F, 0x71, 0x37, 0x17, 0xA7, 0xF0, 0xDE, 0x1A, 0x89, 0xBB, 0x62, 0x28,
    0x07, 0xFF, 0xB2, 0xFA, 0x6F, 0x91, 0x30, 0xEC, 0x90, 0x84, 0xF6, 0xE3,
    0xA7, 0x78, 0x81, 0x13, 0x6C, 0xC7, 0x1F, 0x57, 0xB1, 0x27, 0x4F, 0x43,
    0xAB, 0x58, 0x92, 0x48, 0xCD, 0x94, 0x7B, 0xEA, 0xEC, 0x1F, 0xE6, 0x65,
    0x3E, 0xD8, 0x14, 0x1B, 0x96, 0x09, 0xD1, 0x05, 0xCC, 0xDD, 0xB7, 0xBC,
    0x69, 0xF5, 0x33, 0x58, 0x0C, 0x32, 0x27, 0xA2, 0xF5, 0xE4, 0x28, 0x1C,
    0xD2, 0xC0, 0xF8, 0x67, 0xD4, 0x58, 0xC4, 0xA4, 0x12, 0x30, 0x0E, 0x4D,
    0xD7, 0x7E, 0x2B, 0x01, 0xC5, 0xD3, 0xA7, 0xF9, 0xEA, 0xFE, 0x3D, 0x04,
    0x9E, 0xE8, 0x39, 0x9E, 0xC7, 0xE5, 0xF1, 0xCC, 0x72, 0xB7, 0x5E, 0x5B,
    0xFC, 0xAB, 0xF4, 0x42, 0x3E, 0x7A, 0xBE, 0x8C, 0x03, 0xB1, 0x11, 0x4E,
    0x19, 0xFE, 0xB2, 0xFD, 0xF9, 0x9A, 0xE0, 0xC7, 0x1A, 0xCA, 0xFF, 0xD7,
    0x31, 0x40, 0x43, 0x2A, 0xD1, 0x1D, 0xF7, 0x5A, 0x9A, 0x3B, 0xB9, 0x3C,
    0x12, 0x48, 0xB3, 0x7D, 0xC3, 0xE7, 0x64, 0x97, 0x55, 0x5E, 0x70, 0x9B,
    0x75, 0xD6, 0xC5, 0x73, 0x4E, 0xFA, 0xB1, 0x2F, 0xDF, 0x3F, 0x8E, 0x97,
    0xA6, 0x67, 0xFE, 0x4D, 0x3F, 0x5C, 0x09, 0x9B, 0x98, 0xBA, 0xF8, 0xA5,
    0x6D, 0x18, 0x80, 0x61, 0xE9, 0x17, 0x4A, 0xDD, 0x95, 0x92, 0x4F, 0xD4,
    0x57, 0xD0, 0x40, 0xE0, 0x21, 0xC4, 0x76, 0xE2, 0x1A, 0x1E, 0x1F, 0x29,
    0x0A, 0x98, 0xC9, 0x93, 0xA8, 0x6A, 0x55, 0x26, 0x67, 0xAA, 0x14, 0x18,
    0x6A, 0x38, 0x91, 0xEB, 0x13, 0xD0, 0xA8, 0x00, 0x4B, 0x13, 0xB7, 0x3B,
    0x13, 0x74, 0x34, 0xB1, 0xEA, 0x1F, 0x59, 0x4C, 0x1C, 0x7F, 0x73, 0xE8,
    0xF0, 0xE1, 0x10, 0x23, 0xA2, 0x77, 0x35, 0xCA, 0x57, 0x9F, 0x43, 0xE7,
    0xCA, 0xF2, 0xD2, 0xB1, 0x38, 0x27, 0x4D, 0x52, 0xEE, 0x82, 0xB6, 0x3E,
    0xF4, 0xB0, 0x51, 0x82, 0x9E, 0xDB, 0xB9, 0xAE, 0xCC, 0xFD, 0x97, 0x60,
    0x1E, 0x67, 0x5B, 0x5A, 0x6A, 0x9A, 0xEA, 0x0F, 0x90, 0x36, 0xA1, 0xD0,
    0x7D, 0x5E, 0xC3, 0x90, 0x3D, 0x7E, 0xD4, 0xEF, 0xCF, 0xD2, 0x38, 0x67,
    0xBB, 0x1F, 0x58, 0xD4, 0x1B, 0xF2, 0xF0, 0x6A, 0x25, 0x68, 0x82, 0x19,
    0x78, 0xB2, 0xC1, 0x34, 0x1D, 0xFA, 0xD5, 0x24, 0x1C, 0x81, 0x21, 0x74,
    0xB1, 0xE8, 0x59, 0xD7, 0xA1, 0xB7, 0x61, 0xF5, 0x4F, 0x41, 0xEC, 0x27,
    0xE5, 0x30, 0xC2, 0xFB, 0x69, 0xCC, 0x69, 0xF5, 0x0F, 0xF2, 0x0D, 0x2E,
    0xDE, 0x43, 0xC5, 0xA2, 0xA6, 0x99, 0x1F, 0x00, 0x06, 0xD7, 0x93, 0xA5,
    0xD7, 0xAD, 0xD0, 0x6A, 0x61, 0x37, 0xF4, 0xAA, 0xB8, 0xA9, 0x3B, 0x7E,
    0xFC, 0xF7, 0x30, 0xE6, 0xA8, 0x75, 0x65, 0xBA, 0xDD, 0x1D, 0x30, 0x73,
    0x04, 0x5A, 0x37, 0x64, 0xE3, 0x51, 0xFD, 0x36, 0x4D, 0xF1, 0x8F, 0x7E,
    0x38, 0x18, 0xA0, 0x43, 0xE3, 0x9F, 0x03, 0x70, 0x53, 0x08, 0xF1, 0xE1,
    0x13, 0x84, 0x7C, 0x5F, 0x1F, 0xDE, 0x10, 0x01, 0x1A, 0x20, 0xCC, 0x49,
    0xFB, 0xD4, 0xE1, 0x04, 0x42, 0x0D, 0x2C, 0x41, 0x84, 0xDD, 0xFB, 0xC7,
    0xA6, 0x2D, 0x00, 0xCC, 0xB5, 0x3B, 0x31, 0x2E, 0xB4, 0x30, 0xA5, 0x08,
    0x1A, 0x7D, 0x19, 0x81, 0xF0, 0x4D, 0x20, 0x01};

static const char kHkdfLabel[] = "certificate report";

// This test checks that after encrypting and decrypting, a message matches the
// original.
TEST(MessageEncrypterTest, EncryptedMessageCanBeDecrypted) {
  uint8_t server_private_key[32];
  uint8_t server_public_key[32];
  uint8_t client_private_key[32];
  memset(server_private_key, 1, sizeof(server_private_key));
  memset(client_private_key, 2, sizeof(client_private_key));
  X25519_public_from_private(server_public_key, server_private_key);
  encrypted_messages::EncryptedMessage message;
  std::string test_message = "test message";
  ASSERT_TRUE(encrypted_messages::EncryptSerializedMessage(
      server_public_key, 1, "encryption test", test_message, &message));
  std::string decrypted_message;
  ASSERT_TRUE(encrypted_messages::DecryptMessageForTesting(
      server_private_key, "encryption test", message, &decrypted_message));
  ASSERT_EQ(decrypted_message, test_message);
}

TEST(MessageEncrypterTest, DecrypterWorksWithProperKey) {
  // This test decrypts a "known gold" report. It's intentionally brittle
  // in order to catch changes in report encryption that could cause the
  // server to no longer be able to decrypt reports that it receives from
  // Chrome.
  uint8_t server_private_key_[32];
  memset(server_private_key_, 1, sizeof(server_private_key_));
  encrypted_messages::EncryptedMessage encrypted_message;
  std::string decrypted_serialized_report;
  ASSERT_TRUE(encrypted_message.ParseFromString(
      std::string(reinterpret_cast<const char*>(kSerializedEncryptedMessage),
                  sizeof(kSerializedEncryptedMessage))));
  // kHkdfLabel needs to include the null character in the label due to a
  // matching error in the server for the case of certificate reporting,
  // the strlen + 1 can be removed once that error is fixed.
  ASSERT_TRUE(encrypted_messages::DecryptMessageForTesting(
      server_private_key_,
      base::StringPiece(kHkdfLabel, strlen(kHkdfLabel) + 1), encrypted_message,
      &decrypted_serialized_report));
}

TEST(MessageEncrypterTest, DecrypterFailsWithWrongKey) {
  uint8_t server_private_key_[32];
  // Set the private key to an invalid one.
  memset(server_private_key_, 0, sizeof(server_private_key_));
  encrypted_messages::EncryptedMessage encrypted_message;
  std::string decrypted_serialized_message;
  ASSERT_TRUE(encrypted_message.ParseFromString(
      std::string(reinterpret_cast<const char*>(kSerializedEncryptedMessage),
                  sizeof(kSerializedEncryptedMessage))));
  // Check decryption fails when using an invalid key.
  // See comment above about the strlen + 1.
  ASSERT_FALSE(encrypted_messages::DecryptMessageForTesting(
      server_private_key_,
      base::StringPiece(kHkdfLabel, strlen(kHkdfLabel) + 1), encrypted_message,
      &decrypted_serialized_message));
}

}  // namespace
}  // namespace encrypted_messages