| /* |
| * 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 "CryptoAlgorithmECDH.h" |
| |
| #if ENABLE(WEB_CRYPTO) |
| |
| #include "CryptoKeyEC.h" |
| #include "OpenSSLUtilities.h" |
| |
| namespace WebCore { |
| |
| std::optional<Vector<uint8_t>> CryptoAlgorithmECDH::platformDeriveBits(const CryptoKeyEC& baseKey, const CryptoKeyEC& publicKey) |
| { |
| auto ctx = EvpPKeyCtxPtr(EVP_PKEY_CTX_new(baseKey.platformKey(), nullptr)); |
| if (!ctx) |
| return std::nullopt; |
| |
| if (EVP_PKEY_derive_init(ctx.get()) <= 0) |
| return std::nullopt; |
| |
| if (EVP_PKEY_derive_set_peer(ctx.get(), publicKey.platformKey()) <= 0) |
| return std::nullopt; |
| |
| // Call with a nullptr to get the required buffer size. |
| size_t keyLen; |
| if (EVP_PKEY_derive(ctx.get(), nullptr, &keyLen) <= 0) |
| return std::nullopt; |
| |
| Vector<uint8_t> key(keyLen); |
| if (EVP_PKEY_derive(ctx.get(), key.data(), &keyLen) <= 0) |
| return std::nullopt; |
| |
| // Shrink the buffer since the new keyLen may differ from the buffer size. |
| key.shrink(keyLen); |
| |
| return key; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_CRYPTO) |