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146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/* vim:set ts=2 sw=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* "clean room" MD4 implementation (see RFC 1320)
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*/
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#include <string.h>
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#include "md4.h"
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/* the "conditional" function */
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#define F(x,y,z) (((x) & (y)) | (~(x) & (z)))
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/* the "majority" function */
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#define G(x,y,z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
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/* the "parity" function */
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#define H(x,y,z) ((x) ^ (y) ^ (z))
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/* rotate n-bits to the left */
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#define ROTL(x,n) (((x) << (n)) | ((x) >> (0x20 - n)))
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/* round 1: [abcd k s]: a = (a + F(b,c,d) + X[k]) <<< s */
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#define RD1(a,b,c,d,k,s) a += F(b,c,d) + X[k]; a = ROTL(a,s)
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/* round 2: [abcd k s]: a = (a + G(b,c,d) + X[k] + MAGIC) <<< s */
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#define RD2(a,b,c,d,k,s) a += G(b,c,d) + X[k] + 0x5A827999; a = ROTL(a,s)
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/* round 3: [abcd k s]: a = (a + H(b,c,d) + X[k] + MAGIC) <<< s */
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#define RD3(a,b,c,d,k,s) a += H(b,c,d) + X[k] + 0x6ED9EBA1; a = ROTL(a,s)
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/* converts from word array to byte array, len is number of bytes */
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static void w2b(uint8_t *out, const uint32_t *in, uint32_t len)
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{
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uint8_t *bp; const uint32_t *wp, *wpend;
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bp = out;
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wp = in;
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wpend = wp + (len >> 2);
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for (; wp != wpend; ++wp, bp += 4)
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{
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bp[0] = (uint8_t) ((*wp ) & 0xFF);
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bp[1] = (uint8_t) ((*wp >> 8) & 0xFF);
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bp[2] = (uint8_t) ((*wp >> 16) & 0xFF);
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bp[3] = (uint8_t) ((*wp >> 24) & 0xFF);
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}
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}
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/* converts from byte array to word array, len is number of bytes */
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static void b2w(uint32_t *out, const uint8_t *in, uint32_t len)
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{
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uint32_t *wp; const uint8_t *bp, *bpend;
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wp = out;
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bp = in;
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bpend = in + len;
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for (; bp != bpend; bp += 4, ++wp)
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{
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*wp = (uint32_t) (bp[0] ) |
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(uint32_t) (bp[1] << 8) |
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(uint32_t) (bp[2] << 16) |
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(uint32_t) (bp[3] << 24);
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}
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}
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/* update state: data is 64 bytes in length */
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static void md4step(uint32_t state[4], const uint8_t *data)
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{
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uint32_t A, B, C, D, X[16];
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b2w(X, data, 64);
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A = state[0];
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B = state[1];
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C = state[2];
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D = state[3];
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RD1(A,B,C,D, 0,3); RD1(D,A,B,C, 1,7); RD1(C,D,A,B, 2,11); RD1(B,C,D,A, 3,19);
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RD1(A,B,C,D, 4,3); RD1(D,A,B,C, 5,7); RD1(C,D,A,B, 6,11); RD1(B,C,D,A, 7,19);
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RD1(A,B,C,D, 8,3); RD1(D,A,B,C, 9,7); RD1(C,D,A,B,10,11); RD1(B,C,D,A,11,19);
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RD1(A,B,C,D,12,3); RD1(D,A,B,C,13,7); RD1(C,D,A,B,14,11); RD1(B,C,D,A,15,19);
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RD2(A,B,C,D, 0,3); RD2(D,A,B,C, 4,5); RD2(C,D,A,B, 8, 9); RD2(B,C,D,A,12,13);
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RD2(A,B,C,D, 1,3); RD2(D,A,B,C, 5,5); RD2(C,D,A,B, 9, 9); RD2(B,C,D,A,13,13);
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RD2(A,B,C,D, 2,3); RD2(D,A,B,C, 6,5); RD2(C,D,A,B,10, 9); RD2(B,C,D,A,14,13);
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RD2(A,B,C,D, 3,3); RD2(D,A,B,C, 7,5); RD2(C,D,A,B,11, 9); RD2(B,C,D,A,15,13);
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RD3(A,B,C,D, 0,3); RD3(D,A,B,C, 8,9); RD3(C,D,A,B, 4,11); RD3(B,C,D,A,12,15);
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RD3(A,B,C,D, 2,3); RD3(D,A,B,C,10,9); RD3(C,D,A,B, 6,11); RD3(B,C,D,A,14,15);
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RD3(A,B,C,D, 1,3); RD3(D,A,B,C, 9,9); RD3(C,D,A,B, 5,11); RD3(B,C,D,A,13,15);
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RD3(A,B,C,D, 3,3); RD3(D,A,B,C,11,9); RD3(C,D,A,B, 7,11); RD3(B,C,D,A,15,15);
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state[0] += A;
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state[1] += B;
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state[2] += C;
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state[3] += D;
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}
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void md4sum(const uint8_t *input, uint32_t inputLen, uint8_t *result)
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{
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uint8_t final[128];
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uint32_t i, n, m, state[4];
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uint64_t inputLenBits;
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uint32_t inputLenBitsLow;
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uint32_t inputLenBitsHigh;
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/* magic initial states */
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state[0] = 0x67452301;
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state[1] = 0xEFCDAB89;
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state[2] = 0x98BADCFE;
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state[3] = 0x10325476;
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/* compute number of complete 64-byte segments contained in input */
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m = inputLen >> 6;
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/* digest first m segments */
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for (i=0; i<m; ++i)
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md4step(state, (input + (i << 6)));
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/* build final buffer */
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n = inputLen % 64;
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memcpy(final, input + (m << 6), n);
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final[n] = 0x80;
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memset(final + n + 1, 0, 120 - (n + 1));
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/* Append the original input length in bits as a 64-bit number. This is done
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* in two 32-bit chunks, with the least-significant 32 bits first.
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* w2b will handle endianness. */
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inputLenBits = inputLen << 3;
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inputLenBitsLow = (uint32_t)(inputLenBits & 0xFFFFFFFF);
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w2b(final + (n >= 56 ? 120 : 56), &inputLenBitsLow, 4);
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inputLenBitsHigh = (uint32_t)((inputLenBits >> 32) & 0xFFFFFFFF);
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w2b(final + (n >= 56 ? 124 : 60), &inputLenBitsHigh, 4);
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md4step(state, final);
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if (n >= 56)
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md4step(state, final + 64);
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/* copy state to result */
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w2b(result, state, 16);
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}
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