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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <comphelper/crypto/Crypto.hxx>
#include <sal/types.h>
#include <config_oox.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
namespace comphelper
{
namespace
{
#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
static HMAC_CTX* HMAC_CTX_new(void)
{
HMAC_CTX* pContext = new HMAC_CTX;
HMAC_CTX_init(pContext);
return pContext;
}
static void HMAC_CTX_free(HMAC_CTX* pContext)
{
HMAC_CTX_cleanup(pContext);
delete pContext;
}
#endif
namespace
{
struct cipher_delete
{
void operator()(EVP_CIPHER_CTX* p) { EVP_CIPHER_CTX_free(p); }
};
struct hmac_delete
{
SAL_WNODEPRECATED_DECLARATIONS_PUSH // 'HMAC_CTX_free' is deprecated
void
operator()(HMAC_CTX* p)
{
HMAC_CTX_free(p);
}
SAL_WNODEPRECATED_DECLARATIONS_POP
};
}
class CryptoImplementationOpenSSL : public ICryptoImplementation
{
std::unique_ptr<EVP_CIPHER_CTX, cipher_delete> mpContext;
std::unique_ptr<HMAC_CTX, hmac_delete> mpHmacContext;
public:
CryptoImplementationOpenSSL() = default;
virtual ~CryptoImplementationOpenSSL()
{
if (mpContext)
EVP_CIPHER_CTX_cleanup(mpContext.get());
}
void setupEncryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv,
CryptoType eType) override
{
mpContext.reset(EVP_CIPHER_CTX_new());
EVP_CIPHER_CTX_init(mpContext.get());
const EVP_CIPHER* cipher = getCipher(eType);
if (cipher == nullptr)
return;
if (iv.empty())
EVP_EncryptInit_ex(mpContext.get(), cipher, nullptr, key.data(), nullptr);
else
EVP_EncryptInit_ex(mpContext.get(), cipher, nullptr, key.data(), iv.data());
EVP_CIPHER_CTX_set_padding(mpContext.get(), 0);
}
void setupDecryptContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv,
CryptoType eType) override
{
mpContext.reset(EVP_CIPHER_CTX_new());
EVP_CIPHER_CTX_init(mpContext.get());
const EVP_CIPHER* pCipher = getCipher(eType);
if (pCipher == nullptr)
return;
const size_t nMinKeySize = EVP_CIPHER_key_length(pCipher);
if (key.size() < nMinKeySize)
key.resize(nMinKeySize, 0);
if (iv.empty())
EVP_DecryptInit_ex(mpContext.get(), pCipher, nullptr, key.data(), nullptr);
else
{
const size_t nMinIVSize = EVP_CIPHER_iv_length(pCipher);
if (iv.size() < nMinIVSize)
iv.resize(nMinIVSize, 0);
EVP_DecryptInit_ex(mpContext.get(), pCipher, nullptr, key.data(), iv.data());
}
EVP_CIPHER_CTX_set_padding(mpContext.get(), 0);
}
void setupCryptoHashContext(std::vector<sal_uInt8>& rKey, CryptoHashType eType) override
{
SAL_WNODEPRECATED_DECLARATIONS_PUSH // 'HMAC_CTX_new' is deprecated
mpHmacContext.reset(HMAC_CTX_new());
SAL_WNODEPRECATED_DECLARATIONS_POP
const EVP_MD* aEvpMd = nullptr;
switch (eType)
{
case CryptoHashType::SHA1:
aEvpMd = EVP_sha1();
break;
case CryptoHashType::SHA256:
aEvpMd = EVP_sha256();
break;
case CryptoHashType::SHA384:
aEvpMd = EVP_sha384();
break;
case CryptoHashType::SHA512:
aEvpMd = EVP_sha512();
break;
}
SAL_WNODEPRECATED_DECLARATIONS_PUSH // 'HMAC_Init_ex' is deprecated
HMAC_Init_ex(mpHmacContext.get(), rKey.data(), rKey.size(), aEvpMd, nullptr);
SAL_WNODEPRECATED_DECLARATIONS_POP
}
static const EVP_CIPHER* getCipher(CryptoType type)
{
switch (type)
{
case CryptoType::AES_128_ECB:
return EVP_aes_128_ecb();
case CryptoType::AES_256_ECB:
return EVP_aes_256_ecb();
case CryptoType::AES_128_CBC:
return EVP_aes_128_cbc();
case CryptoType::AES_256_CBC:
return EVP_aes_256_cbc();
default:
break;
}
return nullptr;
}
sal_uInt32 decryptUpdate(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input,
sal_uInt32 inputLength) override
{
if (!mpContext)
return 0;
int outputLength = 0;
(void)EVP_DecryptUpdate(mpContext.get(), output.data(), &outputLength, input.data(),
inputLength);
return outputLength;
}
sal_uInt32 encryptUpdate(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input,
sal_uInt32 inputLength) override
{
if (!mpContext)
return 0;
int outputLength = 0;
(void)EVP_EncryptUpdate(mpContext.get(), output.data(), &outputLength, input.data(),
inputLength);
return sal_uInt32(outputLength);
}
bool cryptoHashUpdate(std::vector<sal_uInt8>& rInput, sal_uInt32 nInputLength) override
{
SAL_WNODEPRECATED_DECLARATIONS_PUSH // 'HMAC_Update' is deprecated
return HMAC_Update(mpHmacContext.get(), rInput.data(), nInputLength)
!= 0;
SAL_WNODEPRECATED_DECLARATIONS_POP
}
bool cryptoHashFinalize(std::vector<sal_uInt8>& rHash) override
{
unsigned int nSizeWritten = 0;
SAL_WNODEPRECATED_DECLARATIONS_PUSH // 'HMAC_Final' is deprecated
(void) HMAC_Final(mpHmacContext.get(), rHash.data(), &nSizeWritten);
SAL_WNODEPRECATED_DECLARATIONS_POP
return nSizeWritten == rHash.size();
}
};
} // anonymous namespace
std::shared_ptr<ICryptoImplementation> ICryptoImplementation::createInstance()
{
return std::shared_ptr<ICryptoImplementation>(new CryptoImplementationOpenSSL);
}
} // namespace comphelper
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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