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https://github.com/Mercury-Language/mercury.git
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9b41c255fa
compiler/bytecode_data.m:
compiler/md4.m:
Add no_determinism_warning pragmas in order to avoid warnings
for predicates that call sorry/2 in non-C grades.
275 lines
7.9 KiB
Mathematica
275 lines
7.9 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%-----------------------------------------------------------------------------%
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% Copyright (C) 2009, 2011 The University of Melbourne.
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% This file may only be copied under the terms of the GNU General
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% Public License - see the file COPYING in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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%
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% File: md4.
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% Main author: wangp.
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%
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% This module contains an implementation of the MD4 message digest algorithm.
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% The C code is adapted from:
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%
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% a implementation of MD4 designed for use in the SMB authentication protocol
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% Copyright (C) Andrew Tridgell 1997-1998.
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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, 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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%-----------------------------------------------------------------------------%
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:- module libs.md4.
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:- interface.
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:- func md4sum(string) = string.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module require. % Required by non-C grades.
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%-----------------------------------------------------------------------------%
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:- pragma foreign_decl("C", "local", "
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#include ""mercury_string.h""
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struct mdfour {
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MR_uint_least32_t A;
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MR_uint_least32_t B;
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MR_uint_least32_t C;
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MR_uint_least32_t D;
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MR_uint_least32_t totalN;
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unsigned char tail[64];
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unsigned tail_len;
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};
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static void mdfour_begin(struct mdfour *md);
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static void mdfour_update(struct mdfour *md, const unsigned char *in, int n);
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static void mdfour_tail(struct mdfour *m, const unsigned char *in, int n);
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static void mdfour_result(const struct mdfour *md, unsigned char out[12]);
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").
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:- pragma foreign_code("C", "
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#define MASK32 (0xffffffff)
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#define F(X,Y,Z) ((((X)&(Y)) | ((~(X))&(Z))))
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#define G(X,Y,Z) ((((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))))
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#define H(X,Y,Z) (((X)^(Y)^(Z)))
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#define lshift(x,s) (((((x)<<(s))&MASK32) | (((x)>>(32-(s)))&MASK32)))
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#define ROUND1(a,b,c,d,k,s) \
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a = lshift((a + F(b,c,d) + M[k]) & MASK32, s)
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#define ROUND2(a,b,c,d,k,s) \
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a = lshift((a + G(b,c,d) + M[k] + 0x5A827999) & MASK32, s)
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#define ROUND3(a,b,c,d,k,s) \
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a = lshift((a + H(b,c,d) + M[k] + 0x6ED9EBA1) & MASK32, s)
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/* this applies md4 to 64 byte chunks */
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static void mdfour64(struct mdfour *m, MR_uint_least32_t *M)
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{
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MR_uint_least32_t AA, BB, CC, DD;
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MR_uint_least32_t A,B,C,D;
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A = m->A; B = m->B; C = m->C; D = m->D;
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AA = A; BB = B; CC = C; DD = D;
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ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
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ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
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ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
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ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
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ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
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ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
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ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
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ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
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ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
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ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
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ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
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ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
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ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
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ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
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ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
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ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
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ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
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ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
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ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
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ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
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ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
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ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
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ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
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ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
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A += AA; B += BB;
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C += CC; D += DD;
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A &= MASK32; B &= MASK32;
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C &= MASK32; D &= MASK32;
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m->A = A; m->B = B; m->C = C; m->D = D;
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}
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static void copy64(MR_uint_least32_t *M, const unsigned char *in)
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{
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int i;
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for (i=0; i<16; i++) {
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M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
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(in[i*4+1]<<8) | (in[i*4+0]<<0);
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}
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}
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static void copy4(unsigned char *out, MR_uint_least32_t x)
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{
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out[0] = x & 0xFF;
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out[1] = (x>>8) & 0xFF;
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out[2] = (x>>16) & 0xFF;
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out[3] = (x>>24) & 0xFF;
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}
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static void mdfour_begin(struct mdfour *md)
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{
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md->A = 0x67452301;
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md->B = 0xefcdab89;
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md->C = 0x98badcfe;
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md->D = 0x10325476;
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md->totalN = 0;
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md->tail_len = 0;
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}
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static void mdfour_update(struct mdfour *md, const unsigned char *in, int n)
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{
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MR_uint_least32_t M[16];
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if (in == NULL) {
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mdfour_tail(md, md->tail, md->tail_len);
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return;
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}
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if (md->tail_len) {
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int len = 64 - md->tail_len;
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if (len > n) {
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len = n;
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}
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MR_memcpy(md->tail+md->tail_len, in, len);
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md->tail_len += len;
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n -= len;
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in += len;
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if (md->tail_len == 64) {
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copy64(M, md->tail);
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mdfour64(md, M);
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md->totalN += 64;
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md->tail_len = 0;
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}
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}
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while (n >= 64) {
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copy64(M, in);
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mdfour64(md, M);
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in += 64;
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n -= 64;
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md->totalN += 64;
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}
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if (n) {
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MR_memcpy(md->tail, in, n);
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md->tail_len = n;
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}
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}
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static void mdfour_tail(struct mdfour *m, const unsigned char *in, int n)
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{
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unsigned char buf[128];
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MR_uint_least32_t M[16];
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MR_uint_least32_t b;
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m->totalN += n;
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b = m->totalN * 8;
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MR_memset(buf, 0, 128);
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if (n) {
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MR_memcpy(buf, in, n);
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}
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buf[n] = 0x80;
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if (n <= 55) {
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copy4(buf+56, b);
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copy64(M, buf);
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mdfour64(m, M);
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} else {
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copy4(buf+120, b);
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copy64(M, buf);
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mdfour64(m, M);
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copy64(M, buf+64);
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mdfour64(m, M);
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}
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}
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static void mdfour_result(const struct mdfour *m, unsigned char *out)
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{
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copy4(out, m->A);
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copy4(out+4, m->B);
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copy4(out+8, m->C);
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copy4(out+12, m->D);
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}
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").
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:- pragma no_determinism_warning(md4sum/1).
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:- pragma foreign_proc("C",
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md4sum(In::in) = (Digest::out),
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[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
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"
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const char hex[16] = ""0123456789abcdef"";
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struct mdfour md;
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unsigned char sum[16];
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char hexbuf[sizeof(sum) * 2 + 1];
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char *p;
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size_t i;
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mdfour_begin(&md);
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mdfour_update(&md, (const unsigned char *) In, strlen(In));
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mdfour_update(&md, NULL, 0);
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mdfour_result(&md, sum);
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/* Convert to hexadecimal string representation. */
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p = hexbuf;
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for (i = 0; i < sizeof(sum); i++) {
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*p++ = hex[(sum[i] & 0xf0) >> 4];
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*p++ = hex[(sum[i] & 0x0f)];
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}
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*p = '\\0';
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MR_make_aligned_string_copy(Digest, hexbuf);
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").
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%-----------------------------------------------------------------------------%
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% Implementation for non-C backends left as an exercise for the reader.
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%
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md4sum(_) = _ :-
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sorry($file, $pred).
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%-----------------------------------------------------------------------------%
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:- end_module libs.md4.
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%-----------------------------------------------------------------------------%
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