/* hash.cpp * * Copyright (C) 2003 Sawtooth Consulting Ltd. * * This file is part of yaSSL. * * yaSSL is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * yaSSL is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ /* hash.cpp implements a base for digest types */ #include "runtime.hpp" #include #include "hash.hpp" namespace TaoCrypt { // Update digest with data of size len, do in blocks void HASHwithTransform::Update(const byte* data, word32 len) { // do block size increments word32 blockSz = getBlockSize(); while (len) { word32 add = min(len, blockSz - buffLen_); memcpy(&buffer_[buffLen_], data, add); buffLen_ += add; data += add; len -= add; if (buffLen_ == blockSz) { ByteReverseIf(buffer_, buffer_, blockSz, getByteOrder()); Transform(); } } } // Final process, place digest in hash void HASHwithTransform::Final(byte* hash) { word32 blockSz = getBlockSize(); word32 digestSz = getDigestSize(); word32 padSz = getPadSize(); ByteOrder order = getByteOrder(); word32 prePadLen = length_ + buffLen_ * 8; // in bits buffer_[buffLen_++] = 0x80; // add 1 // pad with zeros if (buffLen_ > padSz) { while (buffLen_ < blockSz) buffer_[buffLen_++] = 0; ByteReverseIf(buffer_, buffer_, blockSz, order); Transform(); } while (buffLen_ < padSz) buffer_[buffLen_++] = 0; ByteReverseIf(buffer_, buffer_, blockSz, order); word32 hiSize = 0; // for future 64 bit length TODO: memcpy(&buffer_[padSz], order ? &hiSize : &prePadLen, sizeof(prePadLen)); memcpy(&buffer_[padSz+4], order ? &prePadLen : &hiSize, sizeof(prePadLen)); Transform(); ByteReverseIf(digest_, digest_, digestSz, order); memcpy(hash, digest_, digestSz); Init(); // reset state } } // namespace