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/*
* 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 "CryptoAlgorithmAES_GCM.h"
#if ENABLE(WEB_CRYPTO)
#include "CryptoAlgorithmAesGcmParams.h"
#include "CryptoKeyAES.h"
#include "OpenSSLCryptoUniquePtr.h"
#include <openssl/evp.h>
namespace WebCore {
static const EVP_CIPHER* aesAlgorithm(size_t keySize)
{
if (keySize * 8 == 128)
return EVP_aes_128_gcm();
if (keySize * 8 == 192)
return EVP_aes_192_gcm();
if (keySize * 8 == 256)
return EVP_aes_256_gcm();
return nullptr;
}
static std::optional<Vector<uint8_t>> cryptEncrypt(const Vector<uint8_t>& key, const Vector<uint8_t>& iv, const Vector<uint8_t>& plainText, const Vector<uint8_t>& additionalData, uint8_t tagLength)
{
const EVP_CIPHER* algorithm = aesAlgorithm(key.size());
if (!algorithm)
return std::nullopt;
EvpCipherCtxPtr ctx;
int len;
Vector<uint8_t> cipherText(plainText.size() + tagLength);
size_t tagOffset = plainText.size();
// Create and initialize the context
if (!(ctx = EvpCipherCtxPtr(EVP_CIPHER_CTX_new())))
return std::nullopt;
// Disable padding
if (1 != EVP_CIPHER_CTX_set_padding(ctx.get(), 0))
return std::nullopt;
// Initialize the encryption operation
if (1 != EVP_EncryptInit_ex(ctx.get(), algorithm, nullptr, nullptr, nullptr))
return std::nullopt;
// Set IV length
if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_IVLEN, iv.size(), nullptr))
return std::nullopt;
// Initialize key and IV
if (1 != EVP_EncryptInit_ex(ctx.get(), nullptr, nullptr, key.data(), iv.data()))
return std::nullopt;
// Provide any AAD data
if (additionalData.size() > 0) {
if (1 != EVP_EncryptUpdate(ctx.get(), nullptr, &len, additionalData.data(), additionalData.size()))
return std::nullopt;
}
// Provide the message to be encrypted, and obtain the encrypted output
if (1 != EVP_EncryptUpdate(ctx.get(), cipherText.data(), &len, plainText.data(), plainText.size()))
return std::nullopt;
// Finalize the encryption. Normally ciphertext bytes may be written at
// this stage, but this does not occur in GCM mode
if (1 != EVP_EncryptFinal_ex(ctx.get(), cipherText.data() + len, &len))
return std::nullopt;
// Get the tag
if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_GET_TAG, tagLength, cipherText.data() + tagOffset))
return std::nullopt;
return cipherText;
}
static std::optional<Vector<uint8_t>> cryptDecrypt(const Vector<uint8_t>& key, const Vector<uint8_t>& iv, const Vector<uint8_t>& cipherText, const Vector<uint8_t>& additionalData, uint8_t tagLength)
{
const EVP_CIPHER* algorithm = aesAlgorithm(key.size());
if (!algorithm)
return std::nullopt;
EvpCipherCtxPtr ctx;
int len;
int plainTextLen;
int cipherTextLen = cipherText.size() - tagLength;
Vector<uint8_t> plainText(cipherText.size());
Vector<uint8_t> tag { cipherText.data() + cipherTextLen, tagLength };
// Create and initialize the context
if (!(ctx = EvpCipherCtxPtr(EVP_CIPHER_CTX_new())))
return std::nullopt;
// Disable padding
if (1 != EVP_CIPHER_CTX_set_padding(ctx.get(), 0))
return std::nullopt;
// Initialize the encryption operation
if (1 != EVP_DecryptInit_ex(ctx.get(), algorithm, nullptr, nullptr, nullptr))
return std::nullopt;
// Set IV length
if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_IVLEN, iv.size(), nullptr))
return std::nullopt;
// Initialize key and IV
if (1 != EVP_DecryptInit_ex(ctx.get(), nullptr, nullptr, key.data(), iv.data()))
return std::nullopt;
// Provide any AAD data
if (additionalData.size() > 0) {
if (1 != EVP_DecryptUpdate(ctx.get(), nullptr, &len, additionalData.data(), additionalData.size()))
return std::nullopt;
}
// Set expected tag value
if (1 != EVP_CIPHER_CTX_ctrl(ctx.get(), EVP_CTRL_GCM_SET_TAG, tag.size(), tag.data()))
return std::nullopt;
// Provide the message to be encrypted, and obtain the encrypted output
if (1 != EVP_DecryptUpdate(ctx.get(), plainText.data(), &len, cipherText.data(), cipherTextLen))
return std::nullopt;
plainTextLen = len;
// Finalize the decryption
if (1 != EVP_DecryptFinal_ex(ctx.get(), plainText.data() + len, &len))
return std::nullopt;
plainTextLen += len;
plainText.shrink(plainTextLen);
return plainText;
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_GCM::platformEncrypt(const CryptoAlgorithmAesGcmParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& plainText)
{
auto output = cryptEncrypt(key.key(), parameters.ivVector(), plainText, parameters.additionalDataVector(), parameters.tagLength.value_or(0) / 8);
if (!output)
return Exception { OperationError };
return WTFMove(*output);
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_GCM::platformDecrypt(const CryptoAlgorithmAesGcmParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& cipherText)
{
auto output = cryptDecrypt(key.key(), parameters.ivVector(), cipherText, parameters.additionalDataVector(), parameters.tagLength.value_or(0) / 8);
if (!output)
return Exception { OperationError };
return WTFMove(*output);
}
} // namespace WebCore
#endif // ENABLE(WEB_CRYPTO)
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