| /* |
| * Copyright (C) 2020 Sony Interactive Entertainment Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "CryptoAlgorithmHMAC.h" |
| |
| #if ENABLE(WEB_CRYPTO) |
| |
| #include "CryptoKeyHMAC.h" |
| #include "OpenSSLCryptoUniquePtr.h" |
| #include "OpenSSLUtilities.h" |
| #include <openssl/evp.h> |
| #include <wtf/CryptographicUtilities.h> |
| |
| namespace WebCore { |
| |
| static std::optional<Vector<uint8_t>> calculateSignature(const EVP_MD* algorithm, const Vector<uint8_t>& key, const uint8_t* data, size_t dataLength) |
| { |
| // Create the Message Digest Context |
| EvpDigestCtxPtr ctx; |
| if (!(ctx = EvpDigestCtxPtr(EVP_MD_CTX_create()))) |
| return std::nullopt; |
| |
| // Initialize the DigestSign operation |
| EvpPKeyPtr hkey; |
| if (!(hkey = EvpPKeyPtr(EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, nullptr, key.data(), key.size())))) |
| return std::nullopt; |
| |
| if (1 != EVP_DigestSignInit(ctx.get(), nullptr, algorithm, nullptr, hkey.get())) |
| return std::nullopt; |
| |
| // Call update with the message |
| if (1 != EVP_DigestSignUpdate(ctx.get(), data, dataLength)) |
| return std::nullopt; |
| |
| // Finalize the DigestSign operation |
| size_t len = 0; |
| if (1 != EVP_DigestSignFinal(ctx.get(), nullptr, &len)) |
| return std::nullopt; |
| |
| // Obtain the signature |
| Vector<uint8_t> cipherText(len); |
| if (1 != EVP_DigestSignFinal(ctx.get(), cipherText.data(), &len)) |
| return std::nullopt; |
| |
| return cipherText; |
| } |
| |
| ExceptionOr<Vector<uint8_t>> CryptoAlgorithmHMAC::platformSign(const CryptoKeyHMAC& key, const Vector<uint8_t>& data) |
| { |
| auto algorithm = digestAlgorithm(key.hashAlgorithmIdentifier()); |
| if (!algorithm) |
| return Exception { OperationError }; |
| |
| auto result = calculateSignature(algorithm, key.key(), data.data(), data.size()); |
| if (!result) |
| return Exception { OperationError }; |
| return WTFMove(*result); |
| } |
| |
| ExceptionOr<bool> CryptoAlgorithmHMAC::platformVerify(const CryptoKeyHMAC& key, const Vector<uint8_t>& signature, const Vector<uint8_t>& data) |
| { |
| auto algorithm = digestAlgorithm(key.hashAlgorithmIdentifier()); |
| if (!algorithm) |
| return Exception { OperationError }; |
| |
| auto expectedSignature = calculateSignature(algorithm, key.key(), data.data(), data.size()); |
| if (!expectedSignature) |
| return Exception { OperationError }; |
| // Using a constant time comparison to prevent timing attacks. |
| return signature.size() == expectedSignature->size() && !constantTimeMemcmp(expectedSignature->data(), signature.data(), expectedSignature->size()); |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_CRYPTO) |