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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 <sal/config.h>
#include <com/sun/star/uno/RuntimeException.hpp>
#include <comphelper/hash.hxx>
#include <rtl/ustring.hxx>
#include <rtl/alloc.h>
#include <osl/endian.h>
#include <config_oox.h>
#if USE_TLS_NSS
#include <nss.h>
#include <sechash.h>
#elif USE_TLS_OPENSSL
#include <openssl/evp.h>
#include <openssl/sha.h>
#endif // USE_TLS_OPENSSL
namespace comphelper {
struct HashImpl
{
#if USE_TLS_NSS
HASHContext* mpContext;
HASH_HashType getNSSType() const
{
switch (meType)
{
case HashType::MD5:
return HASH_AlgMD5;
case HashType::SHA1:
return HASH_AlgSHA1;
case HashType::SHA256:
return HASH_AlgSHA256;
case HashType::SHA512:
return HASH_AlgSHA512;
}
return HASH_AlgNULL;
}
#elif USE_TLS_OPENSSL
EVP_MD_CTX* mpContext;
const EVP_MD* getOpenSSLType() const
{
switch (meType)
{
case HashType::MD5:
return EVP_md5();
case HashType::SHA1:
return EVP_sha1();
case HashType::SHA256:
return EVP_sha256();
case HashType::SHA512:
return EVP_sha512();
}
return nullptr;
}
#endif
HashType const meType;
HashImpl(HashType eType):
meType(eType)
{
#if USE_TLS_NSS
auto const e = NSS_NoDB_Init(nullptr);
if (e != SECSuccess) {
throw css::uno::RuntimeException("NSS_NoDB_Init failed with " + OUString::number(e));
}
mpContext = HASH_Create(getNSSType());
HASH_Begin(mpContext);
#elif USE_TLS_OPENSSL
mpContext = EVP_MD_CTX_create();
EVP_DigestInit_ex(mpContext, getOpenSSLType(), nullptr);
#endif
}
~HashImpl()
{
#if USE_TLS_NSS
HASH_Destroy(mpContext);
#elif USE_TLS_OPENSSL
EVP_MD_CTX_destroy(mpContext);
#endif
}
};
Hash::Hash(HashType eType):
mpImpl(new HashImpl(eType))
{
}
Hash::~Hash()
{
}
void Hash::update(const unsigned char* pInput, size_t length)
{
#if USE_TLS_NSS
HASH_Update(mpImpl->mpContext, pInput, length);
#elif USE_TLS_OPENSSL
EVP_DigestUpdate(mpImpl->mpContext, pInput, length);
#else
(void)pInput;
(void)length;
#endif
}
std::vector<unsigned char> Hash::finalize()
{
std::vector<unsigned char> hash(getLength(), 0);
unsigned int digestWrittenLength;
#if USE_TLS_NSS
HASH_End(mpImpl->mpContext, hash.data(), &digestWrittenLength, getLength());
#elif USE_TLS_OPENSSL
EVP_DigestFinal_ex(mpImpl->mpContext, hash.data(), &digestWrittenLength);
#else
(void)digestWrittenLength;
#endif
return hash;
}
size_t Hash::getLength() const
{
switch (mpImpl->meType)
{
case HashType::MD5:
return MD5_HASH_LENGTH;
case HashType::SHA1:
return SHA1_HASH_LENGTH;
case HashType::SHA256:
return SHA256_HASH_LENGTH;
case HashType::SHA512:
return SHA512_HASH_LENGTH;
}
return 0;
}
std::vector<unsigned char> Hash::calculateHash(const unsigned char* pInput, size_t length, HashType eType)
{
Hash aHash(eType);
aHash.update(pInput, length);
return aHash.finalize();
}
std::vector<unsigned char> Hash::calculateHash(
const unsigned char* pInput, size_t nLength,
const unsigned char* pSalt, size_t nSaltLen,
sal_uInt32 nSpinCount,
IterCount eIterCount,
HashType eType)
{
if (!pSalt)
nSaltLen = 0;
if (!nSaltLen && !nSpinCount)
return calculateHash( pInput, nLength, eType);
Hash aHash(eType);
if (nSaltLen)
{
std::vector<unsigned char> initialData( nSaltLen + nLength);
std::copy( pSalt, pSalt + nSaltLen, initialData.begin());
std::copy( pInput, pInput + nLength, initialData.begin() + nSaltLen);
aHash.update( initialData.data(), initialData.size());
rtl_secureZeroMemory( initialData.data(), initialData.size());
}
else
{
aHash.update( pInput, nLength);
}
std::vector<unsigned char> hash( aHash.finalize());
if (nSpinCount)
{
// https://msdn.microsoft.com/en-us/library/dd920692
// says the iteration is concatenated after the hash.
// https://msdn.microsoft.com/en-us/library/dd924776 and
// https://msdn.microsoft.com/en-us/library/dd925430
// say the iteration is prepended to the hash.
const size_t nAddIter = (eIterCount == IterCount::NONE ? 0 : 4);
const size_t nIterPos = (eIterCount == IterCount::APPEND ? hash.size() : 0);
const size_t nHashPos = (eIterCount == IterCount::PREPEND ? nAddIter : 0);
std::vector<unsigned char> data( hash.size() + nAddIter, 0);
for (sal_uInt32 i = 0; i < nSpinCount; ++i)
{
std::copy( hash.begin(), hash.end(), data.begin() + nHashPos);
if (nAddIter)
{
#ifdef OSL_BIGENDIAN
sal_uInt32 be = i;
sal_uInt8* p = reinterpret_cast<sal_uInt8*>(&be);
std::swap( p[0], p[3] );
std::swap( p[1], p[2] );
memcpy( data.data() + nIterPos, &be, nAddIter);
#else
memcpy( data.data() + nIterPos, &i, nAddIter);
#endif
}
/* TODO: isn't there something better than
* creating/finalizing/destroying on each iteration? */
Hash aReHash(eType);
aReHash.update( data.data(), data.size());
hash = aReHash.finalize();
}
}
return hash;
}
std::vector<unsigned char> Hash::calculateHash(
const OUString& rPassword,
const std::vector<unsigned char>& rSaltValue,
sal_uInt32 nSpinCount,
IterCount eIterCount,
HashType eType)
{
const unsigned char* pPassBytes = reinterpret_cast<const unsigned char*>(rPassword.getStr());
const size_t nPassBytesLen = rPassword.getLength() * 2;
#ifdef OSL_BIGENDIAN
// Swap UTF16-BE to UTF16-LE
std::vector<unsigned char> vPass;
if (nPassBytesLen)
{
vPass.resize( nPassBytesLen);
std::copy( pPassBytes, pPassBytes + nPassBytesLen, vPass.begin());
unsigned char* p = vPass.data();
unsigned char const * const pEnd = p + nPassBytesLen;
for ( ; p < pEnd; p += 2 )
{
std::swap( p[0], p[1] );
}
pPassBytes = vPass.data();
}
#endif
return calculateHash( pPassBytes, nPassBytesLen, rSaltValue.data(), rSaltValue.size(), nSpinCount,
eIterCount, eType);
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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