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305 lines
6.9 KiB
C
305 lines
6.9 KiB
C
/*
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* RFC 1321 compliant MD5 implementation
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*
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* Copyright (C) 2001-2003 Christophe Devine
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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 3 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 along
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* with this program; if not, visit the http://fsf.org website.
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*/
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#include "rsync.h"
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void md5_begin(md_context *ctx)
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{
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ctx->A = 0x67452301;
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ctx->B = 0xEFCDAB89;
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ctx->C = 0x98BADCFE;
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ctx->D = 0x10325476;
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ctx->totalN = ctx->totalN2 = 0;
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}
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static void md5_process(md_context *ctx, const uchar data[CSUM_CHUNK])
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{
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uint32 X[16], A, B, C, D;
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A = ctx->A;
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B = ctx->B;
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C = ctx->C;
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D = ctx->D;
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X[0] = IVALu(data, 0);
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X[1] = IVALu(data, 4);
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X[2] = IVALu(data, 8);
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X[3] = IVALu(data, 12);
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X[4] = IVALu(data, 16);
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X[5] = IVALu(data, 20);
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X[6] = IVALu(data, 24);
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X[7] = IVALu(data, 28);
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X[8] = IVALu(data, 32);
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X[9] = IVALu(data, 36);
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X[10] = IVALu(data, 40);
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X[11] = IVALu(data, 44);
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X[12] = IVALu(data, 48);
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X[13] = IVALu(data, 52);
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X[14] = IVALu(data, 56);
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X[15] = IVALu(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) a += F(b,c,d) + X[k] + t, a = S(a,s) + b
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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->A += A;
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ctx->B += B;
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ctx->C += C;
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ctx->D += D;
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}
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void md5_update(md_context *ctx, const uchar *input, uint32 length)
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{
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uint32 left, fill;
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if (!length)
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return;
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left = ctx->totalN & 0x3F;
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fill = CSUM_CHUNK - left;
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ctx->totalN += length;
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ctx->totalN &= 0xFFFFFFFF;
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if (ctx->totalN < length)
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ctx->totalN2++;
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if (left && length >= fill) {
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memcpy(ctx->buffer + left, input, fill);
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md5_process(ctx, ctx->buffer);
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length -= fill;
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input += fill;
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left = 0;
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}
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while (length >= CSUM_CHUNK) {
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md5_process(ctx, input);
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length -= CSUM_CHUNK;
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input += CSUM_CHUNK;
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}
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if (length)
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memcpy(ctx->buffer + left, input, length);
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}
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static uchar md5_padding[CSUM_CHUNK] = { 0x80 };
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void md5_result(md_context *ctx, uchar digest[MD5_DIGEST_LEN])
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{
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uint32 last, padn;
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uint32 high, low;
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uchar msglen[8];
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high = (ctx->totalN >> 29)
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| (ctx->totalN2 << 3);
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low = (ctx->totalN << 3);
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SIVALu(msglen, 0, low);
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SIVALu(msglen, 4, high);
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last = ctx->totalN & 0x3F;
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padn = last < 56 ? 56 - last : 120 - last;
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md5_update(ctx, md5_padding, padn);
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md5_update(ctx, msglen, 8);
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SIVALu(digest, 0, ctx->A);
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SIVALu(digest, 4, ctx->B);
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SIVALu(digest, 8, ctx->C);
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SIVALu(digest, 12, ctx->D);
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}
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void get_md5(uchar *out, const uchar *input, int n)
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{
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md_context ctx;
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md5_begin(&ctx);
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md5_update(&ctx, input, n);
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md5_result(&ctx, out);
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}
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#ifdef TEST_MD5
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#include <stdlib.h>
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#include <stdio.h>
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/*
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* those are the standard RFC 1321 test vectors
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*/
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static struct {
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char *str, *md5;
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} tests[] = {
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{ "",
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"d41d8cd98f00b204e9800998ecf8427e" },
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{ "a",
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"0cc175b9c0f1b6a831c399e269772661" },
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{ "abc",
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"900150983cd24fb0d6963f7d28e17f72" },
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{ "message digest",
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"f96b697d7cb7938d525a2f31aaf161d0" },
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{ "abcdefghijklmnopqrstuvwxyz",
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"c3fcd3d76192e4007dfb496cca67e13b" },
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{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
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"d174ab98d277d9f5a5611c2c9f419d9f" },
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{ "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
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"57edf4a22be3c955ac49da2e2107b67a" },
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{ NULL, NULL }
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};
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int main(int argc, char *argv[])
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{
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FILE *f;
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int i, j;
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char output[33];
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md_context ctx;
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uchar buf[1000];
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uchar md5sum[MD5_DIGEST_LEN];
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if (argc < 2) {
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printf("\nMD5 Validation Tests:\n\n");
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for (i = 0; tests[i].str; i++) {
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char *str = tests[i].str;
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char *chk = tests[i].md5;
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printf(" Test %d ", i + 1);
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get_md5(md5sum, str, strlen(str));
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for (j = 0; j < MD5_DIGEST_LEN; j++)
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sprintf(output + j * 2, "%02x", md5sum[j]);
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if (memcmp(output, chk, 32)) {
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printf("failed!\n");
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return 1;
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}
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printf("passed.\n");
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}
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printf("\n");
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return 0;
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}
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while (--argc) {
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if (!(f = fopen(*++argv, "rb"))) {
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perror("fopen");
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return 1;
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}
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md5_begin(&ctx);
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while ((i = fread(buf, 1, sizeof buf, f)) > 0)
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md5_update(&ctx, buf, i);
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md5_result(&ctx, md5sum);
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for (j = 0; j < MD5_DIGEST_LEN; j++)
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printf("%02x", md5sum[j]);
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printf(" %s\n", *argv);
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}
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return 0;
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}
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#endif
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