/* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.   License to copy and use this software is granted provided that it   is identified as the "RSA Data Security, Inc. MD4 Message-Digest   Algorithm" in all material mentioning or referencing this software   or this function.   License is also granted to make and use derivative works provided   that such works are identified as "derived from the RSA Data   Security, Inc. MD4 Message-Digest Algorithm" in all material   mentioning or referencing the derived work.   RSA Data Security, Inc. makes no representations concerning either   the merchantability of this software or the suitability of this   software for any particular purpose. It is provided "as is"   without express or implied warranty of any kind.   These notices must be retained in any copies of any part of this   documentation and/or software. */#include "leapmd4.h"/* Constants for MD4Transform routine. */#define S11 3#define S12 7#define S13 11#define S14 19#define S21 3#define S22 5#define S23 9#define S24 13#define S31 3#define S32 9#define S33 11#define S34 15static void MD4Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));static void Encode PROTO_LIST  ((unsigned char *, UINT4 *, unsigned int));static void Decode PROTO_LIST  ((UINT4 *, unsigned char *, unsigned int));static void MD4_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));static void MD4_memset PROTO_LIST ((POINTER, int, unsigned int));static unsigned char PADDING[64] = {  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};/* F, G and H are basic MD4 functions. */#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))#define H(x, y, z) ((x) ^ (y) ^ (z))/* ROTATE_LEFT rotates x left n bits. */#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))/* FF, GG and HH are transformations for rounds 1, 2 and 3 *//* Rotation is separate from addition to prevent recomputation */#define FF(a, b, c, d, x, s) { \    (a) += F ((b), (c), (d)) + (x); \    (a) = ROTATE_LEFT ((a), (s)); \  }#define GG(a, b, c, d, x, s) { \    (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \    (a) = ROTATE_LEFT ((a), (s)); \  }#define HH(a, b, c, d, x, s) { \    (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \    (a) = ROTATE_LEFT ((a), (s)); \  }void md4_calc(output, input, inlen)unsigned char *output;unsigned char *input;                                /* input block */unsigned int inlen;                     /* length of input block */{	MD4_CTX_	context;	MD4Init(&context);	MD4Update(&context, input, inlen);	MD4Final(output, &context);}/* MD4 initialization. Begins an MD4 operation, writing a new context. */void MD4Init (context)MD4_CTX_ *context;                                        /* context */{  context->count[0] = context->count[1] = 0;  /* Load magic initialization constants.   */  context->state[0] = 0x67452301;  context->state[1] = 0xefcdab89;  context->state[2] = 0x98badcfe;  context->state[3] = 0x10325476;}/* MD4 block update operation. Continues an MD4 message-digest     operation, processing another message block, and updating the     context. */void MD4Update (context, input, inputLen)MD4_CTX_ *context;                                        /* context */unsigned char *input;                                /* input block */unsigned int inputLen;                     /* length of input block */{  unsigned int i, index, partLen;  /* Compute number of bytes mod 64 */  index = (unsigned int)((context->count[0] >> 3) & 0x3F);  /* Update number of bits */  if ((context->count[0] += ((UINT4)inputLen << 3))      < ((UINT4)inputLen << 3))    context->count[1]++;  context->count[1] += ((UINT4)inputLen >> 29);  partLen = 64 - index;  /* Transform as many times as possible.   */  if (inputLen >= partLen) {    MD4_memcpy      ((POINTER)&context->buffer[index], (POINTER)input, partLen);    MD4Transform (context->state, context->buffer);    for (i = partLen; i + 63 < inputLen; i += 64)      MD4Transform (context->state, &input[i]);    index = 0;  }  else    i = 0;  /* Buffer remaining input */  MD4_memcpy    ((POINTER)&context->buffer[index], (POINTER)&input[i],     inputLen-i);}/* MD4 finalization. Ends an MD4 message-digest operation, writing the     the message digest and zeroizing the context. */void MD4Final (digest, context)unsigned char digest[16];                         /* message digest */MD4_CTX_ *context;                                        /* context */{  unsigned char bits[8];  unsigned int index, padLen;  /* Save number of bits */  Encode (bits, context->count, 8);  /* Pad out to 56 mod 64.   */  index = (unsigned int)((context->count[0] >> 3) & 0x3f);  padLen = (index < 56) ? (56 - index) : (120 - index);  MD4Update (context, PADDING, padLen);  /* Append length (before padding) */  MD4Update (context, bits, 8);  /* Store state in digest */  Encode (digest, context->state, 16);  /* Zeroize sensitive information.   */  MD4_memset ((POINTER)context, 0, sizeof (*context));}/* MD4 basic transformation. Transforms state based on block. */static void MD4Transform (state, block)UINT4 state[4];unsigned char block[64];{  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];  Decode (x, block, 64);  /* Round 1 */  FF (a, b, c, d, x[ 0], S11); /* 1 */  FF (d, a, b, c, x[ 1], S12); /* 2 */  FF (c, d, a, b, x[ 2], S13); /* 3 */  FF (b, c, d, a, x[ 3], S14); /* 4 */  FF (a, b, c, d, x[ 4], S11); /* 5 */  FF (d, a, b, c, x[ 5], S12); /* 6 */  FF (c, d, a, b, x[ 6], S13); /* 7 */  FF (b, c, d, a, x[ 7], S14); /* 8 */  FF (a, b, c, d, x[ 8], S11); /* 9 */  FF (d, a, b, c, x[ 9], S12); /* 10 */  FF (c, d, a, b, x[10], S13); /* 11 */  FF (b, c, d, a, x[11], S14); /* 12 */  FF (a, b, c, d, x[12], S11); /* 13 */  FF (d, a, b, c, x[13], S12); /* 14 */  FF (c, d, a, b, x[14], S13); /* 15 */  FF (b, c, d, a, x[15], S14); /* 16 */  /* Round 2 */  GG (a, b, c, d, x[ 0], S21); /* 17 */  GG (d, a, b, c, x[ 4], S22); /* 18 */  GG (c, d, a, b, x[ 8], S23); /* 19 */  GG (b, c, d, a, x[12], S24); /* 20 */  GG (a, b, c, d, x[ 1], S21); /* 21 */  GG (d, a, b, c, x[ 5], S22); /* 22 */  GG (c, d, a, b, x[ 9], S23); /* 23 */  GG (b, c, d, a, x[13], S24); /* 24 */  GG (a, b, c, d, x[ 2], S21); /* 25 */  GG (d, a, b, c, x[ 6], S22); /* 26 */  GG (c, d, a, b, x[10], S23); /* 27 */  GG (b, c, d, a, x[14], S24); /* 28 */  GG (a, b, c, d, x[ 3], S21); /* 29 */  GG (d, a, b, c, x[ 7], S22); /* 30 */  GG (c, d, a, b, x[11], S23); /* 31 */  GG (b, c, d, a, x[15], S24); /* 32 */  /* Round 3 */  HH (a, b, c, d, x[ 0], S31); /* 33 */  HH (d, a, b, c, x[ 8], S32); /* 34 */  HH (c, d, a, b, x[ 4], S33); /* 35 */  HH (b, c, d, a, x[12], S34); /* 36 */  HH (a, b, c, d, x[ 2], S31); /* 37 */  HH (d, a, b, c, x[10], S32); /* 38 */  HH (c, d, a, b, x[ 6], S33); /* 39 */  HH (b, c, d, a, x[14], S34); /* 40 */  HH (a, b, c, d, x[ 1], S31); /* 41 */  HH (d, a, b, c, x[ 9], S32); /* 42 */  HH (c, d, a, b, x[ 5], S33); /* 43 */  HH (b, c, d, a, x[13], S34); /* 44 */  HH (a, b, c, d, x[ 3], S31); /* 45 */  HH (d, a, b, c, x[11], S32); /* 46 */  HH (c, d, a, b, x[ 7], S33); /* 47 */  HH (b, c, d, a, x[15], S34); /* 48 */  state[0] += a;  state[1] += b;  state[2] += c;  state[3] += d;  /* Zeroize sensitive information.   */  MD4_memset ((POINTER)x, 0, sizeof (x));}/* Encodes input (UINT4) into output (unsigned char). Assumes len is     a multiple of 4. */static void Encode (output, input, len)unsigned char *output;UINT4 *input;unsigned int len;{  unsigned int i, j;  for (i = 0, j = 0; j < len; i++, j += 4) {    output[j] = (unsigned char)(input[i] & 0xff);    output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);    output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);    output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);  }}/* Decodes input (unsigned char) into output (UINT4). Assumes len is     a multiple of 4. */static void Decode (output, input, len)UINT4 *output;unsigned char *input;unsigned int len;{  unsigned int i, j;  for (i = 0, j = 0; j < len; i++, j += 4)    output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |      (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);}/* Note: Replace "for loop" with standard memcpy if possible. */static void MD4_memcpy (output, input, len)POINTER output;POINTER input;unsigned int len;{  unsigned int i;  for (i = 0; i < len; i++)    output[i] = input[i];}/* Note: Replace "for loop" with standard memset if possible. */static void MD4_memset (output, value, len)POINTER output;int value;unsigned int len;{  unsigned int i;  for (i = 0; i < len; i++)    ((char *)output)[i] = (char)value;}