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https://github.com/moparisthebest/pacman
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d59324c8ff
A look at what this does on 64 bit systems since we were using the unnecessarily large 'unsigned long' type before even though it was 64 bits wide: $ ~/bin/bloat-o-meter libalpm.so.old lib/libalpm/.libs/libalpm.so add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-10412 (-10412) function old new delta md5_finish 370 356 -14 sha2_finish 547 531 -16 md5_process 3762 2643 -1119 sha2_process 20356 11093 -9263 The code size is nearly halved in the sha2 case (44% smaller code size), and md5 gets a nice size reduction (27% smaller) as well. We also move base64 code to <stdint.h> types as well; we can use 'uint32_t' rather than 'unsigned long' for at least two variables in the decode function. This doesn't net the same size benefit as the hash code case, but it is more proper. Signed-off-by: Dan McGee <dan@archlinux.org>
334 lines
9.1 KiB
C
334 lines
9.1 KiB
C
/*
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* RFC 1321 compliant MD5 implementation
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*
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* Copyright (C) 2006-2010, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* The MD5 algorithm was designed by Ron Rivest in 1991.
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*
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* http://www.ietf.org/rfc/rfc1321.txt
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*/
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/*
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* Pacman Notes:
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*
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* Taken from the PolarSSL project at http://polarssl.org under terms of the
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* GPL. This is from version 1.0.0 of the library, and has been modified
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* as following, which may be helpful for future updates:
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* * remove "polarssl/config.h" include
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* * change include from "polarssl/md5.h" to "md5.h"
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* * removal of HMAC code
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* * removal of SELF_TEST code
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* * removal of ipad and opad from the md5_context struct in md5.h
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* * increase the size of buffer for performance reasons
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* * change 'unsigned long' to uint32_t
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include "md5.h"
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/*
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* 32-bit integer manipulation macros (little endian)
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*/
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#ifndef GET_U32_LE
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#define GET_U32_LE(n,b,i) \
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{ \
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(n) = ( (uint32_t) (b)[(i) ] ) \
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| ( (uint32_t) (b)[(i) + 1] << 8 ) \
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| ( (uint32_t) (b)[(i) + 2] << 16 ) \
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| ( (uint32_t) (b)[(i) + 3] << 24 ); \
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}
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#endif
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#ifndef PUT_U32_LE
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#define PUT_U32_LE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( (n) ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
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}
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#endif
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/*
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* MD5 context setup
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*/
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static void md5_starts( md5_context *ctx )
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{
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xEFCDAB89;
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ctx->state[2] = 0x98BADCFE;
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ctx->state[3] = 0x10325476;
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}
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static void md5_process( md5_context *ctx, const unsigned char data[64] )
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{
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uint32_t X[16], A, B, C, D;
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GET_U32_LE( X[ 0], data, 0 );
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GET_U32_LE( X[ 1], data, 4 );
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GET_U32_LE( X[ 2], data, 8 );
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GET_U32_LE( X[ 3], data, 12 );
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GET_U32_LE( X[ 4], data, 16 );
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GET_U32_LE( X[ 5], data, 20 );
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GET_U32_LE( X[ 6], data, 24 );
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GET_U32_LE( X[ 7], data, 28 );
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GET_U32_LE( X[ 8], data, 32 );
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GET_U32_LE( X[ 9], data, 36 );
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GET_U32_LE( X[10], data, 40 );
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GET_U32_LE( X[11], data, 44 );
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GET_U32_LE( X[12], data, 48 );
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GET_U32_LE( X[13], data, 52 );
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GET_U32_LE( X[14], data, 56 );
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GET_U32_LE( X[15], data, 60 );
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#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
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#define P(a,b,c,d,k,s,t) \
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{ \
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a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
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}
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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#define F(x,y,z) (z ^ (x & (y ^ z)))
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P( A, B, C, D, 0, 7, 0xD76AA478 );
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P( D, A, B, C, 1, 12, 0xE8C7B756 );
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P( C, D, A, B, 2, 17, 0x242070DB );
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P( B, C, D, A, 3, 22, 0xC1BDCEEE );
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P( A, B, C, D, 4, 7, 0xF57C0FAF );
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P( D, A, B, C, 5, 12, 0x4787C62A );
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P( C, D, A, B, 6, 17, 0xA8304613 );
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P( B, C, D, A, 7, 22, 0xFD469501 );
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P( A, B, C, D, 8, 7, 0x698098D8 );
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P( D, A, B, C, 9, 12, 0x8B44F7AF );
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P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
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P( B, C, D, A, 11, 22, 0x895CD7BE );
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P( A, B, C, D, 12, 7, 0x6B901122 );
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P( D, A, B, C, 13, 12, 0xFD987193 );
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P( C, D, A, B, 14, 17, 0xA679438E );
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P( B, C, D, A, 15, 22, 0x49B40821 );
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#undef F
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#define F(x,y,z) (y ^ (z & (x ^ y)))
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P( A, B, C, D, 1, 5, 0xF61E2562 );
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P( D, A, B, C, 6, 9, 0xC040B340 );
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P( C, D, A, B, 11, 14, 0x265E5A51 );
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P( B, C, D, A, 0, 20, 0xE9B6C7AA );
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P( A, B, C, D, 5, 5, 0xD62F105D );
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P( D, A, B, C, 10, 9, 0x02441453 );
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P( C, D, A, B, 15, 14, 0xD8A1E681 );
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P( B, C, D, A, 4, 20, 0xE7D3FBC8 );
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P( A, B, C, D, 9, 5, 0x21E1CDE6 );
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P( D, A, B, C, 14, 9, 0xC33707D6 );
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P( C, D, A, B, 3, 14, 0xF4D50D87 );
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P( B, C, D, A, 8, 20, 0x455A14ED );
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P( A, B, C, D, 13, 5, 0xA9E3E905 );
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P( D, A, B, C, 2, 9, 0xFCEFA3F8 );
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P( C, D, A, B, 7, 14, 0x676F02D9 );
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P( B, C, D, A, 12, 20, 0x8D2A4C8A );
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#undef F
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#define F(x,y,z) (x ^ y ^ z)
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P( A, B, C, D, 5, 4, 0xFFFA3942 );
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P( D, A, B, C, 8, 11, 0x8771F681 );
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P( C, D, A, B, 11, 16, 0x6D9D6122 );
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P( B, C, D, A, 14, 23, 0xFDE5380C );
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P( A, B, C, D, 1, 4, 0xA4BEEA44 );
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P( D, A, B, C, 4, 11, 0x4BDECFA9 );
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P( C, D, A, B, 7, 16, 0xF6BB4B60 );
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P( B, C, D, A, 10, 23, 0xBEBFBC70 );
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P( A, B, C, D, 13, 4, 0x289B7EC6 );
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P( D, A, B, C, 0, 11, 0xEAA127FA );
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P( C, D, A, B, 3, 16, 0xD4EF3085 );
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P( B, C, D, A, 6, 23, 0x04881D05 );
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P( A, B, C, D, 9, 4, 0xD9D4D039 );
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P( D, A, B, C, 12, 11, 0xE6DB99E5 );
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P( C, D, A, B, 15, 16, 0x1FA27CF8 );
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P( B, C, D, A, 2, 23, 0xC4AC5665 );
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#undef F
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#define F(x,y,z) (y ^ (x | ~z))
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P( A, B, C, D, 0, 6, 0xF4292244 );
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P( D, A, B, C, 7, 10, 0x432AFF97 );
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P( C, D, A, B, 14, 15, 0xAB9423A7 );
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P( B, C, D, A, 5, 21, 0xFC93A039 );
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P( A, B, C, D, 12, 6, 0x655B59C3 );
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P( D, A, B, C, 3, 10, 0x8F0CCC92 );
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P( C, D, A, B, 10, 15, 0xFFEFF47D );
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P( B, C, D, A, 1, 21, 0x85845DD1 );
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P( A, B, C, D, 8, 6, 0x6FA87E4F );
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P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
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P( C, D, A, B, 6, 15, 0xA3014314 );
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P( B, C, D, A, 13, 21, 0x4E0811A1 );
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P( A, B, C, D, 4, 6, 0xF7537E82 );
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P( D, A, B, C, 11, 10, 0xBD3AF235 );
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P( C, D, A, B, 2, 15, 0x2AD7D2BB );
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P( B, C, D, A, 9, 21, 0xEB86D391 );
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#undef F
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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}
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/*
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* MD5 process buffer
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*/
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static void md5_update( md5_context *ctx, const unsigned char *input, size_t ilen )
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{
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size_t fill;
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uint32_t left;
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if( ilen <= 0 )
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return;
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if( ctx->total[0] < (uint32_t) ilen )
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ctx->total[1]++;
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if( left && ilen >= fill )
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{
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memcpy( (void *) (ctx->buffer + left),
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(void *) input, fill );
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md5_process( ctx, ctx->buffer );
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while( ilen >= 64 )
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{
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md5_process( ctx, input );
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input += 64;
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ilen -= 64;
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}
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if( ilen > 0 )
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{
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memcpy( (void *) (ctx->buffer + left),
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(void *) input, ilen );
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}
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}
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static const unsigned char md5_padding[64] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* MD5 final digest
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*/
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static void md5_finish( md5_context *ctx, unsigned char output[16] )
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{
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uint32_t last, padn;
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uint32_t high, low;
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unsigned char msglen[8];
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high = ( ctx->total[0] >> 29 )
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| ( ctx->total[1] << 3 );
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low = ( ctx->total[0] << 3 );
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PUT_U32_LE( low, msglen, 0 );
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PUT_U32_LE( high, msglen, 4 );
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last = ctx->total[0] & 0x3F;
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padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
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md5_update( ctx, (unsigned char *) md5_padding, padn );
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md5_update( ctx, msglen, 8 );
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PUT_U32_LE( ctx->state[0], output, 0 );
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PUT_U32_LE( ctx->state[1], output, 4 );
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PUT_U32_LE( ctx->state[2], output, 8 );
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PUT_U32_LE( ctx->state[3], output, 12 );
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}
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/*
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* output = MD5( input buffer )
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*/
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void md5( const unsigned char *input, size_t ilen, unsigned char output[16] )
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{
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md5_context ctx;
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md5_starts( &ctx );
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md5_update( &ctx, input, ilen );
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md5_finish( &ctx, output );
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memset( &ctx, 0, sizeof( md5_context ) );
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}
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/*
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* output = MD5( file contents )
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*/
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int md5_file( const char *path, unsigned char output[16] )
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{
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FILE *f;
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size_t n;
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md5_context ctx;
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unsigned char buf[4096];
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if( ( f = fopen( path, "rb" ) ) == NULL )
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return( 1 );
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md5_starts( &ctx );
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while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
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md5_update( &ctx, buf, n );
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md5_finish( &ctx, output );
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memset( &ctx, 0, sizeof( md5_context ) );
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if( ferror( f ) != 0 )
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{
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fclose( f );
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return( 2 );
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}
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fclose( f );
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return( 0 );
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}
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