kc3-lang/libmd/src/md4.c

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• Hash : 555d5074
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  Date : 2017-04-10T13:10:45
  

  build: Switch to AC_C_BIGENDIAN defining WORD_BIGENDIAN We should use the autoconf macro instead of expecting the system to provide the endianness information, which many do not. [guillem@hadrons.org: - Use autoconf macro instead of gnulib one. - Slightly reword commit message. ] Signed-off-by: Guillem Jover <guillem@hadrons.org>

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• src/md4.c

• /*	$OpenBSD: md4.c,v 1.6 2004/05/28 15:10:27 millert Exp $	*/
  
  /*
   * This code implements the MD4 message-digest algorithm.
   * The algorithm is due to Ron Rivest.	This code was
   * written by Colin Plumb in 1993, no copyright is claimed.
   * This code is in the public domain; do with it what you wish.
   * Todd C. Miller modified the MD5 code to do MD4 based on RFC 1186.
   *
   * Equivalent code is available from RSA Data Security, Inc.
   * This code has been tested against that, and is equivalent,
   * except that you don't need to include two pages of legalese
   * with every copy.
   *
   * To compute the message digest of a chunk of bytes, declare an
   * MD4Context structure, pass it to MD4Init, call MD4Update as
   * needed on buffers full of bytes, and then call MD4Final, which
   * will fill a supplied 16-byte array with the digest.
   */
  
  #include <config.h>
  
  #include <sys/types.h>
  #include <string.h>
  #include <md4.h>
  
  #define PUT_64BIT_LE(cp, value) do {					\
  	(cp)[7] = (value) >> 56;					\
  	(cp)[6] = (value) >> 48;					\
  	(cp)[5] = (value) >> 40;					\
  	(cp)[4] = (value) >> 32;					\
  	(cp)[3] = (value) >> 24;					\
  	(cp)[2] = (value) >> 16;					\
  	(cp)[1] = (value) >> 8;						\
  	(cp)[0] = (value); } while (0)
  
  #define PUT_32BIT_LE(cp, value) do {					\
  	(cp)[3] = (value) >> 24;					\
  	(cp)[2] = (value) >> 16;					\
  	(cp)[1] = (value) >> 8;						\
  	(cp)[0] = (value); } while (0)
  
  static uint8_t PADDING[MD4_BLOCK_LENGTH] = {
  	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  };
  
  /*
   * Start MD4 accumulation.
   * Set bit count to 0 and buffer to mysterious initialization constants.
   */
  void
  MD4Init(MD4_CTX *ctx)
  {
  	ctx->count = 0;
  	ctx->state[0] = 0x67452301;
  	ctx->state[1] = 0xefcdab89;
  	ctx->state[2] = 0x98badcfe;
  	ctx->state[3] = 0x10325476;
  }
  
  /*
   * Update context to reflect the concatenation of another buffer full
   * of bytes.
   */
  void
  MD4Update(MD4_CTX *ctx, const unsigned char *input, size_t len)
  {
  	size_t have, need;
  
  	/* Check how many bytes we already have and how many more we need. */
  	have = (size_t)((ctx->count >> 3) & (MD4_BLOCK_LENGTH - 1));
  	need = MD4_BLOCK_LENGTH - have;
  
  	/* Update bitcount */
  	ctx->count += (uint64_t)len << 3;
  
  	if (len >= need) {
  		if (have != 0) {
  			memcpy(ctx->buffer + have, input, need);
  			MD4Transform(ctx->state, ctx->buffer);
  			input += need;
  			len -= need;
  			have = 0;
  		}
  
  		/* Process data in MD4_BLOCK_LENGTH-byte chunks. */
  		while (len >= MD4_BLOCK_LENGTH) {
  			MD4Transform(ctx->state, input);
  			input += MD4_BLOCK_LENGTH;
  			len -= MD4_BLOCK_LENGTH;
  		}
  	}
  
  	/* Handle any remaining bytes of data. */
  	if (len != 0)
  		memcpy(ctx->buffer + have, input, len);
  }
  
  /*
   * Pad pad to 64-byte boundary with the bit pattern
   * 1 0* (64-bit count of bits processed, MSB-first)
   */
  void
  MD4Pad(MD4_CTX *ctx)
  {
  	uint8_t count[8];
  	size_t padlen;
  
  	/* Convert count to 8 bytes in little endian order. */
  	PUT_64BIT_LE(count, ctx->count);
  
  	/* Pad out to 56 mod 64. */
  	padlen = MD4_BLOCK_LENGTH -
  	    ((ctx->count >> 3) & (MD4_BLOCK_LENGTH - 1));
  	if (padlen < 1 + 8)
  		padlen += MD4_BLOCK_LENGTH;
  	MD4Update(ctx, PADDING, padlen - 8);		/* padlen - 8 <= 64 */
  	MD4Update(ctx, count, 8);
  }
  
  /*
   * Final wrapup--call MD4Pad, fill in digest and zero out ctx.
   */
  void
  MD4Final(unsigned char digest[MD4_DIGEST_LENGTH], MD4_CTX *ctx)
  {
  	int i;
  
  	MD4Pad(ctx);
  	if (digest != NULL) {
  		for (i = 0; i < 4; i++)
  			PUT_32BIT_LE(digest + i * 4, ctx->state[i]);
  		memset(ctx, 0, sizeof(*ctx));
  	}
  }
  
  
  /* The three core functions - F1 is optimized somewhat */
  
  /* #define F1(x, y, z) (x & y | ~x & z) */
  #define F1(x, y, z) (z ^ (x & (y ^ z)))
  #define F2(x, y, z) ((x & y) | (x & z) | (y & z))
  #define F3(x, y, z) (x ^ y ^ z)
  
  /* This is the central step in the MD4 algorithm. */
  #define MD4STEP(f, w, x, y, z, data, s) \
  	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s) )
  
  /*
   * The core of the MD4 algorithm, this alters an existing MD4 hash to
   * reflect the addition of 16 longwords of new data.  MD4Update blocks
   * the data and converts bytes into longwords for this routine.
   */
  void
  MD4Transform(uint32_t state[4], const uint8_t block[MD4_BLOCK_LENGTH])
  {
  	uint32_t a, b, c, d, in[MD4_BLOCK_LENGTH / 4];
  
  #ifndef WORDS_BIGENDIAN
  	memcpy(in, block, sizeof(in));
  #else
  	for (a = 0; a < MD4_BLOCK_LENGTH / 4; a++) {
  		in[a] = (uint32_t)(
  		    (uint32_t)(block[a * 4 + 0]) |
  		    (uint32_t)(block[a * 4 + 1]) <<  8 |
  		    (uint32_t)(block[a * 4 + 2]) << 16 |
  		    (uint32_t)(block[a * 4 + 3]) << 24);
  	}
  #endif
  
  	a = state[0];
  	b = state[1];
  	c = state[2];
  	d = state[3];
  
  	MD4STEP(F1, a, b, c, d, in[ 0],  3);
  	MD4STEP(F1, d, a, b, c, in[ 1],  7);
  	MD4STEP(F1, c, d, a, b, in[ 2], 11);
  	MD4STEP(F1, b, c, d, a, in[ 3], 19);
  	MD4STEP(F1, a, b, c, d, in[ 4],  3);
  	MD4STEP(F1, d, a, b, c, in[ 5],  7);
  	MD4STEP(F1, c, d, a, b, in[ 6], 11);
  	MD4STEP(F1, b, c, d, a, in[ 7], 19);
  	MD4STEP(F1, a, b, c, d, in[ 8],  3);
  	MD4STEP(F1, d, a, b, c, in[ 9],  7);
  	MD4STEP(F1, c, d, a, b, in[10], 11);
  	MD4STEP(F1, b, c, d, a, in[11], 19);
  	MD4STEP(F1, a, b, c, d, in[12],  3);
  	MD4STEP(F1, d, a, b, c, in[13],  7);
  	MD4STEP(F1, c, d, a, b, in[14], 11);
  	MD4STEP(F1, b, c, d, a, in[15], 19);
  
  	MD4STEP(F2, a, b, c, d, in[ 0] + 0x5a827999,  3);
  	MD4STEP(F2, d, a, b, c, in[ 4] + 0x5a827999,  5);
  	MD4STEP(F2, c, d, a, b, in[ 8] + 0x5a827999,  9);
  	MD4STEP(F2, b, c, d, a, in[12] + 0x5a827999, 13);
  	MD4STEP(F2, a, b, c, d, in[ 1] + 0x5a827999,  3);
  	MD4STEP(F2, d, a, b, c, in[ 5] + 0x5a827999,  5);
  	MD4STEP(F2, c, d, a, b, in[ 9] + 0x5a827999,  9);
  	MD4STEP(F2, b, c, d, a, in[13] + 0x5a827999, 13);
  	MD4STEP(F2, a, b, c, d, in[ 2] + 0x5a827999,  3);
  	MD4STEP(F2, d, a, b, c, in[ 6] + 0x5a827999,  5);
  	MD4STEP(F2, c, d, a, b, in[10] + 0x5a827999,  9);
  	MD4STEP(F2, b, c, d, a, in[14] + 0x5a827999, 13);
  	MD4STEP(F2, a, b, c, d, in[ 3] + 0x5a827999,  3);
  	MD4STEP(F2, d, a, b, c, in[ 7] + 0x5a827999,  5);
  	MD4STEP(F2, c, d, a, b, in[11] + 0x5a827999,  9);
  	MD4STEP(F2, b, c, d, a, in[15] + 0x5a827999, 13);
  
  	MD4STEP(F3, a, b, c, d, in[ 0] + 0x6ed9eba1,  3);
  	MD4STEP(F3, d, a, b, c, in[ 8] + 0x6ed9eba1,  9);
  	MD4STEP(F3, c, d, a, b, in[ 4] + 0x6ed9eba1, 11);
  	MD4STEP(F3, b, c, d, a, in[12] + 0x6ed9eba1, 15);
  	MD4STEP(F3, a, b, c, d, in[ 2] + 0x6ed9eba1,  3);
  	MD4STEP(F3, d, a, b, c, in[10] + 0x6ed9eba1,  9);
  	MD4STEP(F3, c, d, a, b, in[ 6] + 0x6ed9eba1, 11);
  	MD4STEP(F3, b, c, d, a, in[14] + 0x6ed9eba1, 15);
  	MD4STEP(F3, a, b, c, d, in[ 1] + 0x6ed9eba1,  3);
  	MD4STEP(F3, d, a, b, c, in[ 9] + 0x6ed9eba1,  9);
  	MD4STEP(F3, c, d, a, b, in[ 5] + 0x6ed9eba1, 11);
  	MD4STEP(F3, b, c, d, a, in[13] + 0x6ed9eba1, 15);
  	MD4STEP(F3, a, b, c, d, in[ 3] + 0x6ed9eba1,  3);
  	MD4STEP(F3, d, a, b, c, in[11] + 0x6ed9eba1,  9);
  	MD4STEP(F3, c, d, a, b, in[ 7] + 0x6ed9eba1, 11);
  	MD4STEP(F3, b, c, d, a, in[15] + 0x6ed9eba1, 15);
  
  	state[0] += a;
  	state[1] += b;
  	state[2] += c;
  	state[3] += d;
  }
  

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