diff options
Diffstat (limited to 'comphelper/source/misc/hash.cxx')
| -rw-r--r-- | comphelper/source/misc/hash.cxx | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/comphelper/source/misc/hash.cxx b/comphelper/source/misc/hash.cxx new file mode 100644 index 000000000..50fd8cd0f --- /dev/null +++ b/comphelper/source/misc/hash.cxx @@ -0,0 +1,257 @@ +/* -*- 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: */ |