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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 "oox/crypto/CryptTools.hxx"
namespace oox {
namespace core {
using namespace std;
Crypto::Crypto(CryptoType type) :
mType(type)
{
#if USE_TLS_NSS
// Initialize NSS, database functions are not needed
NSS_NoDB_Init(NULL);
#endif // USE_TLS_NSS
}
Crypto::~Crypto()
{
#if USE_TLS_OPENSSL
EVP_CIPHER_CTX_cleanup( &mContext );
#endif
#if USE_TLS_NSS
PK11_DestroyContext( mContext, PR_TRUE );
PK11_FreeSymKey( mSymKey );
SECITEM_FreeItem( mSecParam, PR_TRUE );
#endif
}
#if USE_TLS_OPENSSL
const EVP_CIPHER* Crypto::getCipher(CryptoType type)
{
switch(type)
{
case AES_128_ECB:
return EVP_aes_128_ecb();
case AES_128_CBC:
return EVP_aes_128_cbc();
case AES_256_CBC:
return EVP_aes_256_cbc();
default:
break;
}
return NULL;
}
#endif
#if USE_TLS_NSS
void Crypto::setupContext(vector<sal_uInt8>& key, vector<sal_uInt8>& iv, CryptoType type, CK_ATTRIBUTE_TYPE operation)
{
CK_MECHANISM_TYPE mechanism = -1;
SECItem ivItem;
ivItem.type = siBuffer;
ivItem.data = &iv[0];
ivItem.len = iv.size();
SECItem* pIvItem = NULL;
switch(type)
{
case AES_128_ECB:
mechanism = CKM_AES_ECB;
break;
case AES_128_CBC:
mechanism = CKM_AES_CBC;
pIvItem = &ivItem;
break;
case AES_256_CBC:
mechanism = CKM_AES_CBC;
pIvItem = &ivItem;
break;
default:
break;
}
PK11SlotInfo* aSlot( PK11_GetBestSlot( mechanism, NULL ) );
SECItem keyItem;
keyItem.type = siBuffer;
keyItem.data = &key[0];
keyItem.len = key.size();
mSymKey = PK11_ImportSymKey( aSlot, mechanism, PK11_OriginUnwrap, CKA_ENCRYPT, &keyItem, NULL );
mSecParam = PK11_ParamFromIV( mechanism, pIvItem );
mContext = PK11_CreateContextBySymKey( mechanism, operation, mSymKey, mSecParam );
}
#endif // USE_TLS_NSS
// DECRYPT
Decrypt::Decrypt(vector<sal_uInt8>& key, vector<sal_uInt8>& iv, CryptoType type) :
Crypto(type)
{
#if USE_TLS_OPENSSL
EVP_CIPHER_CTX_init( &mContext );
const EVP_CIPHER* cipher = getCipher(type);
if (iv.empty())
EVP_DecryptInit_ex( &mContext, cipher, NULL, &key[0], 0 );
else
EVP_DecryptInit_ex( &mContext, cipher, NULL, &key[0], &iv[0] );
EVP_CIPHER_CTX_set_padding( &mContext, 0 );
#endif
#if USE_TLS_NSS
setupContext(key, iv, type, CKA_DECRYPT);
#endif // USE_TLS_NSS
}
sal_uInt32 Decrypt::update(vector<sal_uInt8>& output, vector<sal_uInt8>& input, sal_uInt32 inputLength)
{
int outputLength = 0;
sal_uInt32 actualInputLength = inputLength == 0 || inputLength > input.size() ? input.size() : inputLength;
#if USE_TLS_OPENSSL
EVP_DecryptUpdate( &mContext, &output[0], &outputLength, &input[0], actualInputLength );
#endif // USE_TLS_OPENSSL
#if USE_TLS_NSS
PK11_CipherOp( mContext, &output[0], &outputLength, actualInputLength, &input[0], actualInputLength );
#endif // USE_TLS_NSS
return static_cast<sal_uInt32>(outputLength);
}
sal_uInt32 Decrypt::aes128ecb(vector<sal_uInt8>& output, vector<sal_uInt8>& input, vector<sal_uInt8>& key)
{
sal_uInt32 outputLength = 0;
vector<sal_uInt8> iv;
Decrypt crypto(key, iv, Crypto::AES_128_ECB);
outputLength = crypto.update(output, input);
return outputLength;
}
sal_uInt32 Decrypt::aes128cbc(vector<sal_uInt8>& output, vector<sal_uInt8>& input, vector<sal_uInt8>& key, vector<sal_uInt8>& iv)
{
sal_uInt32 outputLength = 0;
Decrypt crypto(key, iv, Crypto::AES_128_CBC);
outputLength = crypto.update(output, input);
return outputLength;
}
// ENCRYPT
Encrypt::Encrypt(vector<sal_uInt8>& key, vector<sal_uInt8>& iv, CryptoType type) :
Crypto(type)
{
#if USE_TLS_OPENSSL
EVP_CIPHER_CTX_init( &mContext );
const EVP_CIPHER* cipher = getCipher(type);
if (iv.empty())
EVP_EncryptInit_ex( &mContext, cipher, NULL, &key[0], 0 );
else
EVP_EncryptInit_ex( &mContext, cipher, NULL, &key[0], &iv[0] );
EVP_CIPHER_CTX_set_padding( &mContext, 0 );
#endif
#if USE_TLS_NSS
setupContext(key, iv, type, CKA_ENCRYPT);
#endif // USE_TLS_NSS
}
sal_uInt32 Encrypt::update(vector<sal_uInt8>& output, vector<sal_uInt8>& input, sal_uInt32 inputLength)
{
int outputLength = 0;
sal_uInt32 actualInputLength = inputLength == 0 || inputLength > input.size() ? input.size() : inputLength;
#if USE_TLS_OPENSSL
EVP_EncryptUpdate( &mContext, &output[0], &outputLength, &input[0], actualInputLength );
#endif // USE_TLS_OPENSSL
#if USE_TLS_NSS
PK11_CipherOp( mContext, &output[0], &outputLength, actualInputLength, &input[0], actualInputLength );
#endif // USE_TLS_NSS
return static_cast<sal_uInt32>(outputLength);
}
bool sha1(vector<sal_uInt8>& output, vector<sal_uInt8>& input)
{
output.clear();
output.resize(RTL_DIGEST_LENGTH_SHA1, 0);
rtlDigest aDigest = rtl_digest_create( rtl_Digest_AlgorithmSHA1 );
rtl_digest_update( aDigest, &input[0], input.size() );
rtl_digest_get( aDigest, &output[0], RTL_DIGEST_LENGTH_SHA1 );
rtl_digest_destroy( aDigest );
return true;
}
bool sha512(vector<sal_uInt8>& output, vector<sal_uInt8>& input)
{
bool aResult = false;
#if USE_TLS_OPENSSL
output.clear();
output.resize(SHA512_DIGEST_LENGTH, 0);
SHA512_CTX context;
SHA512_Init(&context);
SHA512_Update(&context, &input[0], input.size());
SHA512_Final(&output[0], &context);
aResult = true;
#endif
#if USE_TLS_NSS
output.clear();
output.resize(SHA512_LENGTH, 0);
// Initialize NSS, database functions are not needed
NSS_NoDB_Init(NULL);
SECStatus status;
PK11Context* mContext = PK11_CreateDigestContext(SEC_OID_SHA512);
status = PK11_DigestBegin(mContext);
if (status != SECSuccess)
return false;
status = PK11_DigestOp(mContext, &input[0], input.size());
if (status != SECSuccess)
return false;
sal_uInt32 outputLength = 0;
status = PK11_DigestFinal(mContext, &output[0], &outputLength, SHA512_LENGTH);
if (status != SECSuccess || outputLength != SHA512_LENGTH)
return false;
PK11_DestroyContext(mContext, PR_TRUE);
aResult = true;
#endif
return aResult;
}
} // namespace core
} // namespace oox
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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