Artifact 190d96fa7ce99ef5f4c7e5f2ce6a482e429434b610bbc27859727dfcd027c37f:
- File
src/OFMD5Hash.m
— part of check-in
[82801897d3]
at
2022-03-25 10:22:55
on branch trunk
— OFCryptographicHash: Add -[calculate]
Before, -[digest] would do the final calculation, however, this would
mean a property modifies state, which is bad. (user: js, size: 6487) [annotate] [blame] [check-ins using] [more...]
/* * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im> * * All rights reserved. * * This file is part of ObjFW. It may be distributed under the terms of the * Q Public License 1.0, which can be found in the file LICENSE.QPL included in * the packaging of this file. * * Alternatively, it may be distributed under the terms of the GNU General * Public License, either version 2 or 3, which can be found in the file * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this * file. */ #include "config.h" #include <string.h> #import "OFMD5Hash.h" #import "OFSecureData.h" #import "OFHashAlreadyCalculatedException.h" #import "OFHashNotCalculatedException.h" #import "OFOutOfRangeException.h" static const size_t digestSize = 16; static const size_t blockSize = 64; OF_DIRECT_MEMBERS @interface OFMD5Hash () - (void)of_resetState; @end #define F(a, b, c) (((a) & (b)) | (~(a) & (c))) #define G(a, b, c) (((a) & (c)) | ((b) & ~(c))) #define H(a, b, c) ((a) ^ (b) ^ (c)) #define I(a, b, c) ((b) ^ ((a) | ~(c))) static const uint32_t table[] = { 0xD76AA478, 0xE8C7B756, 0x242070DB, 0xC1BDCEEE, 0xF57C0FAF, 0x4787C62A, 0xA8304613, 0xFD469501, 0x698098D8, 0x8B44F7AF, 0xFFFF5BB1, 0x895CD7BE, 0x6B901122, 0xFD987193, 0xA679438E, 0x49B40821, 0xF61E2562, 0xC040B340, 0x265E5A51, 0xE9B6C7AA, 0xD62F105D, 0x02441453, 0xD8A1E681, 0xE7D3FBC8, 0x21E1CDE6, 0xC33707D6, 0xF4D50D87, 0x455A14ED, 0xA9E3E905, 0xFCEFA3F8, 0x676F02D9, 0x8D2A4C8A, 0xFFFA3942, 0x8771F681, 0x6D9D6122, 0xFDE5380C, 0xA4BEEA44, 0x4BDECFA9, 0xF6BB4B60, 0xBEBFBC70, 0x289B7EC6, 0xEAA127FA, 0xD4EF3085, 0x04881D05, 0xD9D4D039, 0xE6DB99E5, 0x1FA27CF8, 0xC4AC5665, 0xF4292244, 0x432AFF97, 0xAB9423A7, 0xFC93A039, 0x655B59C3, 0x8F0CCC92, 0xFFEFF47D, 0x85845DD1, 0x6FA87E4F, 0xFE2CE6E0, 0xA3014314, 0x4E0811A1, 0xF7537E82, 0xBD3AF235, 0x2AD7D2BB, 0xEB86D391 }; static const uint8_t wordOrder[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9 }; static const uint8_t rotateBits[] = { 7, 12, 17, 22, 5, 9, 14, 20, 4, 11, 16, 23, 6, 10, 15, 21 }; static OF_INLINE void byteSwapVectorIfBE(uint32_t *vector, uint_fast8_t length) { #ifdef OF_BIG_ENDIAN for (uint_fast8_t i = 0; i < length; i++) vector[i] = OFByteSwap32(vector[i]); #endif } static void processBlock(uint32_t *state, uint32_t *buffer) { uint32_t new[4]; uint_fast8_t i = 0; new[0] = state[0]; new[1] = state[1]; new[2] = state[2]; new[3] = state[3]; byteSwapVectorIfBE(buffer, 16); #define LOOP_BODY(f) \ { \ uint32_t tmp = new[3]; \ tmp = new[3]; \ new[0] += f(new[1], new[2], new[3]) + \ buffer[wordOrder[i]] + table[i]; \ new[3] = new[2]; \ new[2] = new[1]; \ new[1] += OFRotateLeft(new[0], \ rotateBits[(i % 4) + (i / 16) * 4]); \ new[0] = tmp; \ } for (; i < 16; i++) LOOP_BODY(F) for (; i < 32; i++) LOOP_BODY(G) for (; i < 48; i++) LOOP_BODY(H) for (; i < 64; i++) LOOP_BODY(I) #undef LOOP_BODY state[0] += new[0]; state[1] += new[1]; state[2] += new[2]; state[3] += new[3]; } @implementation OFMD5Hash @synthesize calculated = _calculated; @synthesize allowsSwappableMemory = _allowsSwappableMemory; + (size_t)digestSize { return digestSize; } + (size_t)blockSize { return blockSize; } + (instancetype)hashWithAllowsSwappableMemory: (bool)allowsSwappableMemory { return [[[self alloc] initWithAllowsSwappableMemory: allowsSwappableMemory] autorelease]; } - (instancetype)initWithAllowsSwappableMemory: (bool)allowsSwappableMemory { self = [super init]; @try { _iVarsData = [[OFSecureData alloc] initWithCount: sizeof(*_iVars) allowsSwappableMemory: allowsSwappableMemory]; _iVars = _iVarsData.mutableItems; _allowsSwappableMemory = allowsSwappableMemory; [self of_resetState]; } @catch (id e) { [self release]; @throw e; } return self; } - (instancetype)init { OF_INVALID_INIT_METHOD } - (instancetype)of_init { return [super init]; } - (void)dealloc { [_iVarsData release]; [super dealloc]; } - (size_t)digestSize { return digestSize; } - (size_t)blockSize { return blockSize; } - (id)copy { OFMD5Hash *copy = [[OFMD5Hash alloc] of_init]; copy->_iVarsData = [_iVarsData copy]; copy->_iVars = copy->_iVarsData.mutableItems; copy->_allowsSwappableMemory = _allowsSwappableMemory; copy->_calculated = _calculated; return copy; } - (void)of_resetState { _iVars->state[0] = 0x67452301; _iVars->state[1] = 0xEFCDAB89; _iVars->state[2] = 0x98BADCFE; _iVars->state[3] = 0x10325476; } - (void)updateWithBuffer: (const void *)buffer_ length: (size_t)length { const unsigned char *buffer = buffer_; if (_calculated) @throw [OFHashAlreadyCalculatedException exceptionWithObject: self]; if (length > SIZE_MAX / 8) @throw [OFOutOfRangeException exception]; _iVars->bits += (length * 8); while (length > 0) { size_t min = 64 - _iVars->bufferLength; if (min > length) min = length; memcpy(_iVars->buffer.bytes + _iVars->bufferLength, buffer, min); _iVars->bufferLength += min; buffer += min; length -= min; if (_iVars->bufferLength == 64) { processBlock(_iVars->state, _iVars->buffer.words); _iVars->bufferLength = 0; } } } - (const unsigned char *)digest { if (!_calculated) @throw [OFHashNotCalculatedException exceptionWithObject: self]; return (const unsigned char *)_iVars->state; } - (void)calculate { if (_calculated) @throw [OFHashAlreadyCalculatedException exceptionWithObject: self]; _iVars->buffer.bytes[_iVars->bufferLength] = 0x80; OFZeroMemory(_iVars->buffer.bytes + _iVars->bufferLength + 1, 64 - _iVars->bufferLength - 1); if (_iVars->bufferLength >= 56) { processBlock(_iVars->state, _iVars->buffer.words); OFZeroMemory(_iVars->buffer.bytes, 64); } _iVars->buffer.words[14] = OFToLittleEndian32((uint32_t)(_iVars->bits & 0xFFFFFFFF)); _iVars->buffer.words[15] = OFToLittleEndian32((uint32_t)(_iVars->bits >> 32)); processBlock(_iVars->state, _iVars->buffer.words); OFZeroMemory(&_iVars->buffer, sizeof(_iVars->buffer)); byteSwapVectorIfBE(_iVars->state, 4); _calculated = true; } - (void)reset { [self of_resetState]; _iVars->bits = 0; OFZeroMemory(&_iVars->buffer, sizeof(_iVars->buffer)); _iVars->bufferLength = 0; _calculated = false; } @end