[crypto] Replace MD5 implementation
Replace MD5 implementation with one which is around 20% smaller. This implementation has been verified using the existing MD5 self-tests. Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
parent
cdb4802ff1
commit
fba2310562
450
src/crypto/md5.c
450
src/crypto/md5.c
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/*
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* Cryptographic API.
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/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* MD5 Message Digest Algorithm (RFC1321).
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* Derived from cryptoapi implementation, originally based on the
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* public domain implementation written by Colin Plumb in 1993.
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*
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* Reduced object size by around 50% compared to the original Linux
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* version for use in Etherboot by Michael Brown.
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*
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* Copyright (c) Cryptoapi developers.
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* Copyright (c) 2006 Michael Brown <mbrown@fensystems.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* MD5 algorithm
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*
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*/
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#include <stdint.h>
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#include <string.h>
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#include <byteswap.h>
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#include <assert.h>
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#include <ipxe/crypto.h>
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#include <ipxe/md5.h>
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/**
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* Rotate dword left
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*
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* @v dword Dword
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* @v rotate Amount of rotation
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*/
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static inline __attribute__ (( always_inline )) uint32_t
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rol32 ( uint32_t dword, unsigned int rotate ) {
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return ( ( dword << rotate ) | ( dword >> ( 32 - rotate ) ) );
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}
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/** MD5 variables */
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struct md5_variables {
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/* This layout matches that of struct md5_digest_data,
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* allowing for efficient endianness-conversion,
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*/
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uint32_t a;
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uint32_t b;
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uint32_t c;
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uint32_t d;
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uint32_t w[16];
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} __attribute__ (( packed ));
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/** MD5 constants */
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static const uint32_t k[64] = {
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0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
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0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
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0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
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0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
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0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
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0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
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0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
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};
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/** MD5 shift amounts */
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static const uint8_t r[64] = {
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7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
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5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
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4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
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6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
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};
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/**
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* f(b,c,d) for steps 0 to 15
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*
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* @v v MD5 variables
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* @ret f f(b,c,d)
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*/
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static uint32_t md5_f_0_15 ( struct md5_variables *v ) {
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return ( v->d ^ ( v->b & ( v->c ^ v->d ) ) );
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}
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/**
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* f(b,c,d) for steps 16 to 31
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*
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* @v v MD5 variables
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* @ret f f(b,c,d)
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*/
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static uint32_t md5_f_16_31 ( struct md5_variables *v ) {
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return ( v->c ^ ( v->d & ( v->b ^ v->c ) ) );
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}
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/**
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* f(b,c,d) for steps 32 to 47
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*
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* @v v MD5 variables
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* @ret f f(b,c,d)
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*/
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static uint32_t md5_f_32_47 ( struct md5_variables *v ) {
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return ( v->b ^ v->c ^ v->d );
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}
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/**
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* f(b,c,d) for steps 48 to 63
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*
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* @v v MD5 variables
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* @ret f f(b,c,d)
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*/
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static uint32_t md5_f_48_63 ( struct md5_variables *v ) {
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return ( v->c ^ ( v->b | (~v->d) ) );
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}
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/** An MD5 step function */
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struct md5_step {
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u32 ( * f ) ( u32 b, u32 c, u32 d );
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u8 coefficient;
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u8 constant;
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/**
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* Calculate f(b,c,d)
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*
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* @v v MD5 variables
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* @ret f f(b,c,d)
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*/
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uint32_t ( * f ) ( struct md5_variables *v );
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/** Coefficient of i in g=ni+m */
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uint8_t coefficient;
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/** Constant term in g=ni+m */
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uint8_t constant;
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};
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static u32 f1(u32 b, u32 c, u32 d)
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{
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return ( d ^ ( b & ( c ^ d ) ) );
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}
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static u32 f2(u32 b, u32 c, u32 d)
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{
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return ( c ^ ( d & ( b ^ c ) ) );
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}
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static u32 f3(u32 b, u32 c, u32 d)
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{
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return ( b ^ c ^ d );
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}
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static u32 f4(u32 b, u32 c, u32 d)
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{
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return ( c ^ ( b | ~d ) );
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}
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/** MD5 steps */
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static struct md5_step md5_steps[4] = {
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{
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.f = f1,
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.coefficient = 1,
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.constant = 0,
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},
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{
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.f = f2,
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.coefficient = 5,
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.constant = 1,
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},
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{
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.f = f3,
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.coefficient = 3,
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.constant = 5,
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},
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{
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.f = f4,
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.coefficient = 7,
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.constant = 0,
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}
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/** 0 to 15 */
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{ .f = md5_f_0_15, .coefficient = 1, .constant = 0 },
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/** 16 to 31 */
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{ .f = md5_f_16_31, .coefficient = 5, .constant = 1 },
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/** 32 to 47 */
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{ .f = md5_f_32_47, .coefficient = 3, .constant = 5 },
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/** 48 to 63 */
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{ .f = md5_f_48_63, .coefficient = 7, .constant = 0 },
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};
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static const u8 r[64] = {
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7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,
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5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,
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4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,
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6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
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};
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/**
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* Initialise MD5 algorithm
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*
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* @v ctx MD5 context
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*/
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static void md5_init ( void *ctx ) {
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struct md5_context *context = ctx;
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static const u32 k[64] = {
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0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,
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0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
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0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,
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0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
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0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,
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0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
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0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,
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0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
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0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,
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0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
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0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL,
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0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
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0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,
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0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
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0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,
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0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL,
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};
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context->ddd.dd.digest.h[0] = cpu_to_le32 ( 0x67452301 );
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context->ddd.dd.digest.h[1] = cpu_to_le32 ( 0xefcdab89 );
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context->ddd.dd.digest.h[2] = cpu_to_le32 ( 0x98badcfe );
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context->ddd.dd.digest.h[3] = cpu_to_le32 ( 0x10325476 );
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context->len = 0;
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}
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static void md5_transform(u32 *hash, const u32 *in)
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{
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u32 a, b, c, d, f, g, temp;
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int i;
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/**
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* Calculate MD5 digest of accumulated data
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*
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* @v context MD5 context
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*/
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static void md5_digest ( struct md5_context *context ) {
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union {
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union md5_digest_data_dwords ddd;
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struct md5_variables v;
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} u;
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uint32_t *a = &u.v.a;
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uint32_t *b = &u.v.b;
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uint32_t *c = &u.v.c;
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uint32_t *d = &u.v.d;
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uint32_t *w = u.v.w;
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uint32_t f;
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uint32_t g;
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uint32_t temp;
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struct md5_step *step;
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unsigned int i;
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a = hash[0];
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b = hash[1];
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c = hash[2];
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d = hash[3];
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/* Sanity checks */
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assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 );
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linker_assert ( &u.ddd.dd.digest.h[0] == a, md5_bad_layout );
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linker_assert ( &u.ddd.dd.digest.h[1] == b, md5_bad_layout );
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linker_assert ( &u.ddd.dd.digest.h[2] == c, md5_bad_layout );
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linker_assert ( &u.ddd.dd.digest.h[3] == d, md5_bad_layout );
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linker_assert ( &u.ddd.dd.data.dword[0] == w, md5_bad_layout );
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DBGC ( context, "MD5 digesting:\n" );
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DBGC_HDA ( context, 0, &context->ddd.dd.digest,
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sizeof ( context->ddd.dd.digest ) );
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DBGC_HDA ( context, context->len, &context->ddd.dd.data,
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sizeof ( context->ddd.dd.data ) );
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/* Convert h[0..3] to host-endian, and initialise a, b, c, d,
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* and w[0..15]
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*/
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for ( i = 0 ; i < ( sizeof ( u.ddd.dword ) /
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sizeof ( u.ddd.dword[0] ) ) ; i++ ) {
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le32_to_cpus ( &context->ddd.dword[i] );
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u.ddd.dword[i] = context->ddd.dword[i];
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}
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/* Main loop */
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for ( i = 0 ; i < 64 ; i++ ) {
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step = &md5_steps[i >> 4];
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f = step->f ( b, c, d );
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g = ( ( i * step->coefficient + step->constant ) & 0xf );
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temp = d;
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d = c;
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c = b;
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a += ( f + k[i] + in[g] );
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a = ( ( a << r[i] ) | ( a >> ( 32-r[i] ) ) );
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b += a;
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a = temp;
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step = &md5_steps[ i / 16 ];
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f = step->f ( &u.v );
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g = ( ( ( step->coefficient * i ) + step->constant ) % 16 );
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temp = *d;
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*d = *c;
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*c = *b;
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*b = ( *b + rol32 ( ( *a + f + k[i] + w[g] ), r[i] ) );
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*a = temp;
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DBGC2 ( context, "%2d : %08x %08x %08x %08x\n",
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i, *a, *b, *c, *d );
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}
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hash[0] += a;
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hash[1] += b;
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hash[2] += c;
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hash[3] += d;
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/* Add chunk to hash and convert back to big-endian */
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for ( i = 0 ; i < 4 ; i++ ) {
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context->ddd.dd.digest.h[i] =
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cpu_to_le32 ( context->ddd.dd.digest.h[i] +
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u.ddd.dd.digest.h[i] );
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}
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DBGC ( context, "MD5 digested:\n" );
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DBGC_HDA ( context, 0, &context->ddd.dd.digest,
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sizeof ( context->ddd.dd.digest ) );
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}
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/* XXX: this stuff can be optimized */
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static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
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{
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while (words--) {
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le32_to_cpus(buf);
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buf++;
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/**
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* Accumulate data with MD5 algorithm
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*
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* @v ctx MD5 context
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* @v data Data
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* @v len Length of data
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*/
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static void md5_update ( void *ctx, const void *data, size_t len ) {
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struct md5_context *context = ctx;
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const uint8_t *byte = data;
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size_t offset;
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/* Accumulate data a byte at a time, performing the digest
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* whenever we fill the data buffer
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*/
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while ( len-- ) {
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offset = ( context->len % sizeof ( context->ddd.dd.data ) );
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context->ddd.dd.data.byte[offset] = *(byte++);
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context->len++;
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if ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 )
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md5_digest ( context );
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}
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}
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static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
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{
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while (words--) {
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cpu_to_le32s(buf);
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buf++;
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}
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}
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static inline void md5_transform_helper(struct md5_ctx *ctx)
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{
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le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
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md5_transform(ctx->hash, ctx->block);
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}
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static void md5_init(void *context)
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{
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struct md5_ctx *mctx = context;
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mctx->hash[0] = 0x67452301;
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mctx->hash[1] = 0xefcdab89;
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mctx->hash[2] = 0x98badcfe;
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mctx->hash[3] = 0x10325476;
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mctx->byte_count = 0;
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}
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static void md5_update(void *context, const void *data, size_t len)
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{
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struct md5_ctx *mctx = context;
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const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
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mctx->byte_count += len;
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if (avail > len) {
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, len);
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return;
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}
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, avail);
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md5_transform_helper(mctx);
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data += avail;
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len -= avail;
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while (len >= sizeof(mctx->block)) {
|
||||
memcpy(mctx->block, data, sizeof(mctx->block));
|
||||
md5_transform_helper(mctx);
|
||||
data += sizeof(mctx->block);
|
||||
len -= sizeof(mctx->block);
|
||||
}
|
||||
|
||||
memcpy(mctx->block, data, len);
|
||||
}
|
||||
|
||||
static void md5_final(void *context, void *out)
|
||||
{
|
||||
struct md5_ctx *mctx = context;
|
||||
const unsigned int offset = mctx->byte_count & 0x3f;
|
||||
char *p = (char *)mctx->block + offset;
|
||||
int padding = 56 - (offset + 1);
|
||||
|
||||
*p++ = 0x80;
|
||||
if (padding < 0) {
|
||||
memset(p, 0x00, padding + sizeof (u64));
|
||||
md5_transform_helper(mctx);
|
||||
p = (char *)mctx->block;
|
||||
padding = 56;
|
||||
}
|
||||
|
||||
memset(p, 0, padding);
|
||||
mctx->block[14] = mctx->byte_count << 3;
|
||||
mctx->block[15] = mctx->byte_count >> 29;
|
||||
le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
|
||||
sizeof(u64)) / sizeof(u32));
|
||||
md5_transform(mctx->hash, mctx->block);
|
||||
cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
|
||||
memcpy(out, mctx->hash, sizeof(mctx->hash));
|
||||
memset(mctx, 0, sizeof(*mctx));
|
||||
/**
|
||||
* Generate MD5 digest
|
||||
*
|
||||
* @v ctx MD5 context
|
||||
* @v out Output buffer
|
||||
*/
|
||||
static void md5_final ( void *ctx, void *out ) {
|
||||
struct md5_context *context = ctx;
|
||||
uint64_t len_bits;
|
||||
uint8_t pad;
|
||||
|
||||
/* Record length before pre-processing */
|
||||
len_bits = cpu_to_le64 ( ( ( uint64_t ) context->len ) * 8 );
|
||||
|
||||
/* Pad with a single "1" bit followed by as many "0" bits as required */
|
||||
pad = 0x80;
|
||||
do {
|
||||
md5_update ( ctx, &pad, sizeof ( pad ) );
|
||||
pad = 0x00;
|
||||
} while ( ( context->len % sizeof ( context->ddd.dd.data ) ) !=
|
||||
offsetof ( typeof ( context->ddd.dd.data ), final.len ) );
|
||||
|
||||
/* Append length (in bits) */
|
||||
md5_update ( ctx, &len_bits, sizeof ( len_bits ) );
|
||||
assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 );
|
||||
|
||||
/* Copy out final digest */
|
||||
memcpy ( out, &context->ddd.dd.digest,
|
||||
sizeof ( context->ddd.dd.digest ) );
|
||||
}
|
||||
|
||||
/** MD5 algorithm */
|
||||
struct digest_algorithm md5_algorithm = {
|
||||
.name = "md5",
|
||||
.ctxsize = MD5_CTX_SIZE,
|
||||
.blocksize = ( MD5_BLOCK_WORDS * 4 ),
|
||||
.digestsize = MD5_DIGEST_SIZE,
|
||||
.ctxsize = sizeof ( struct md5_context ),
|
||||
.blocksize = sizeof ( union md5_block ),
|
||||
.digestsize = sizeof ( struct md5_digest ),
|
||||
.init = md5_init,
|
||||
.update = md5_update,
|
||||
.final = md5_final,
|
||||
|
|
|
|||
|
|
@ -1,23 +1,72 @@
|
|||
#ifndef _IPXE_MD5_H
|
||||
#define _IPXE_MD5_H
|
||||
|
||||
/** @file
|
||||
*
|
||||
* MD5 algorithm
|
||||
*
|
||||
*/
|
||||
|
||||
FILE_LICENCE ( GPL2_OR_LATER );
|
||||
|
||||
struct digest_algorithm;
|
||||
|
||||
#include <stdint.h>
|
||||
#include <ipxe/crypto.h>
|
||||
|
||||
#define MD5_DIGEST_SIZE 16
|
||||
#define MD5_BLOCK_WORDS 16
|
||||
#define MD5_HASH_WORDS 4
|
||||
|
||||
struct md5_ctx {
|
||||
u32 hash[MD5_HASH_WORDS];
|
||||
u32 block[MD5_BLOCK_WORDS];
|
||||
u64 byte_count;
|
||||
/** An MD5 digest */
|
||||
struct md5_digest {
|
||||
/** Hash output */
|
||||
uint32_t h[4];
|
||||
};
|
||||
|
||||
#define MD5_CTX_SIZE sizeof ( struct md5_ctx )
|
||||
/** An MD5 data block */
|
||||
union md5_block {
|
||||
/** Raw bytes */
|
||||
uint8_t byte[64];
|
||||
/** Raw dwords */
|
||||
uint32_t dword[16];
|
||||
/** Final block structure */
|
||||
struct {
|
||||
/** Padding */
|
||||
uint8_t pad[56];
|
||||
/** Length in bits */
|
||||
uint64_t len;
|
||||
} final;
|
||||
};
|
||||
|
||||
/** MD5 digest and data block
|
||||
*
|
||||
* The order of fields within this structure is designed to minimise
|
||||
* code size.
|
||||
*/
|
||||
struct md5_digest_data {
|
||||
/** Digest of data already processed */
|
||||
struct md5_digest digest;
|
||||
/** Accumulated data */
|
||||
union md5_block data;
|
||||
} __attribute__ (( packed ));
|
||||
|
||||
/** MD5 digest and data block */
|
||||
union md5_digest_data_dwords {
|
||||
/** Digest and data block */
|
||||
struct md5_digest_data dd;
|
||||
/** Raw dwords */
|
||||
uint32_t dword[ sizeof ( struct md5_digest_data ) /
|
||||
sizeof ( uint32_t ) ];
|
||||
};
|
||||
|
||||
/** An MD5 context */
|
||||
struct md5_context {
|
||||
/** Amount of accumulated data */
|
||||
size_t len;
|
||||
/** Digest and accumulated data */
|
||||
union md5_digest_data_dwords ddd;
|
||||
} __attribute__ (( packed ));
|
||||
|
||||
/** MD5 context size */
|
||||
#define MD5_CTX_SIZE sizeof ( struct md5_context )
|
||||
|
||||
/** MD5 digest size */
|
||||
#define MD5_DIGEST_SIZE sizeof ( struct md5_digest )
|
||||
|
||||
extern struct digest_algorithm md5_algorithm;
|
||||
|
||||
|
|
|
|||
Reference in New Issue