md5c.c
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上传日期:2007-01-03
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TCP/IP协议栈
开发平台:
Visual C++
- /* MD5.C - RSA Data Security, Inc., MD5 message-digest algorithm */
- #include <mem.h>
- #ifdef CPU386
- #pragma inline
- #endif
- #ifndef NULL
- #define NULL (void *)0
- #endif
- /* This version taken from RSAREF 2.0 and modified for use
- * under Borland C++ with DOS by Phil Karn, KA9Q, September 1994.
- * The changes include the replacement of MD5_memset() and MD5_memcpy()
- * with calls to memset() and memcpy(), and the inclusion of an optional
- * 386/486 inline assembler version of MD5Transform().
- *
- * The 386/486 assembler version of MD5Transform() included here was previously
- * released on 22 Feb 1992 with an earlier version of md5.c from RSA;
- * it has been modified here to suit the different
- * internal calling conventions subsequently adopted by RSA.
- */
- /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
- rights reserved.
- License to copy and use this software is granted provided that it
- is identified as the "RSA Data Security, Inc. MD5 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. MD5 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 "global.h" */
- #include "md5.h"
- /* Constants for MD5Transform routine.
- */
- #define S11 7
- #define S12 12
- #define S13 17
- #define S14 22
- #define S21 5
- #define S22 9
- #define S23 14
- #define S24 20
- #define S31 4
- #define S32 11
- #define S33 16
- #define S34 23
- #define S41 6
- #define S42 10
- #define S43 15
- #define S44 21
- static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
- static void Encode PROTO_LIST
- ((unsigned char *, UINT4 *, unsigned int));
- #ifndef CPU386
- static void Decode PROTO_LIST
- ((UINT4 *, unsigned char *, unsigned int));
- #endif
- 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
- };
- #ifndef CPU386
- /* F, G, H and I are basic MD5 functions.
- */
- #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
- #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
- #define H(x, y, z) ((x) ^ (y) ^ (z))
- #define I(x, y, z) ((y) ^ ((x) | (~z)))
- /* ROTATE_LEFT rotates x left n bits.
- */
- #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
- /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
- Rotation is separate from addition to prevent recomputation.
- */
- #define FF(a, b, c, d, x, s, ac) {
- (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #define GG(a, b, c, d, x, s, ac) {
- (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #define HH(a, b, c, d, x, s, ac) {
- (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #define II(a, b, c, d, x, s, ac) {
- (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac);
- (a) = ROTATE_LEFT ((a), (s));
- (a) += (b);
- }
- #endif
- /* MD5 initialization. Begins an MD5 operation, writing a new context.
- */
- void MD5Init (context)
- MD5_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;
- }
- /* MD5 block update operation. Continues an MD5 message-digest
- operation, processing another message block, and updating the
- context.
- * Rewritten to better optimize the common case when MD5Update()
- * is only called with multiples of 64 bytes (e.g., when hashing
- * a stdio buffer) - PRK
- */
- void MD5Update (context, input, inputLen)
- MD5_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);
- if(index != 0){
- /* Complete the partial buffer first */
- partLen = 64 - index; /* room left in buffer */
- i = inputLen > partLen ? partLen : inputLen; /* min(room,data) */
- memcpy(&context->buffer[index],input,i);
- input += i;
- inputLen -= i;
- if(i == partLen){
- /* Buffer now full, hash it */
- MD5Transform(context->state,context->buffer);
- } else
- return; /* Not yet full */
- }
- /* Now do as many 64 byte chunks direct from the input as possible */
- while(inputLen >= 64){
- MD5Transform(context->state,input);
- input += 64;
- inputLen -= 64;
- }
- /* Now buffer any remaining input */
- if(inputLen > 0)
- memcpy(context->buffer,input,inputLen);
- }
- /* MD5 finalization. Ends an MD5 message-digest operation, writing the
- the message digest and zeroizing the context.
- */
- void MD5Final (digest, context)
- unsigned char digest[16]; /* message digest */
- MD5_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);
- MD5Update (context, PADDING, padLen);
- /* Append length (before padding) */
- MD5Update (context, bits, 8);
- if(digest != NULL){ /* Bill Simpson's change to simplify AH */
- /* Store state in digest */
- Encode (digest, context->state, 16);
- /* Zeroize sensitive information. */
- memset ((POINTER)context, 0, sizeof (*context));
- }
- }
- #ifndef CPU386 /* Not used; an asm version is available for the 386/486 */
- /* MD5 basic transformation. Transforms state based on block.
- */
- static void MD5Transform (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, 0xd76aa478); /* 1 */
- FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
- FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
- FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
- FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
- FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
- FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
- FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
- FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
- FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
- FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
- FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
- FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
- FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
- FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
- FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
- /* Round 2 */
- GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
- GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
- GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
- GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
- GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
- GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
- GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
- GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
- GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
- GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
- GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
- GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
- GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
- GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
- GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
- GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
- /* Round 3 */
- HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
- HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
- HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
- HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
- HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
- HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
- HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
- HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
- HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
- HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
- HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
- HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
- HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
- HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
- HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
- HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
- /* Round 4 */
- II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
- II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
- II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
- II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
- II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
- II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
- II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
- II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
- II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
- II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
- II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
- II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
- II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
- II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
- II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
- II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
- /* Zeroize sensitive information.
- */
- memset ((POINTER)x, 0, sizeof (x));
- }
- #endif
- /* 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);
- }
- }
- #ifndef CPU386 /* Not needed in assembler version */
- /* 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);
- }
- #else /* CPU386 */
- /* Fast 386 Borland C inline assembler version of the transform() function
- * from the RSA Data Security, Inc, MD5 Message Digest Algorithm.
- *
- * This version uses native 32 bit registers, so it needs a 386 or 486 CPU.
- * It also assumes large model (-ml)
- *
- * Because this function does *lots* of 32-bit operations, this version is
- * MUCH faster than the reference C version compiled with a garden-
- * variety 16-bit MS-DOS C compiler.
- *
- * Originally written and placed into the public domain on
- * 22 February 1992 by Phil Karn, KA9Q
- *
- * Updated 1 Sept 1994 by Phil Karn to match newer version of MD5.C released
- * in the RSAREF package. Also changed some register assignments to get rid
- * of the segment override prefixes on memory references
- */
- /* Code sequence common to all four rounds.
- * evaluates a = b + (a + edi + x + t) <<< s
- * where it is assumed a and b are registers, x is a memory location,
- * edi is the edi register, and s and t are integer constants
- */
- #define COM(a,b,x,s,t)
- lea a,t[a+edi];
- add a,x;
- rol a,s;
- add a,b;
- /* Round 1 functions */
- /* edi = F(x,y,z) = (x & y) | (~x & z) */
- #define F(x,y,z)
- mov edi,x;
- and edi,y;
- mov ebp,x;
- not ebp;
- and ebp,z;
- or edi,ebp
- /* a = b + ((a + F(b,c,d) + x + t) <<< s); */
- #define FF(a,b,c,d,x,s,t)
- F(b,c,d);
- COM(a,b,x,s,t)
- /* Round 2 functions */
- /* edi = G(x,y,z) = F(z,x,y) = (x & z) | (y & ~z) */
- #define G(x,y,z) F(z,x,y)
- /* a = b + ((a + G(b,c,d) + x + t) <<< s) */
- #define GG(a,b,c,d,x,s,t)
- G(b,c,d);
- COM(a,b,x,s,t)
- /* Round 3 functions */
- /* edi = H(x,y,z) = x ^ y ^ z */
- #define H(x,y,z)
- mov edi,x;
- xor edi,y;
- xor edi,z
- /* a = b + ((a + H(b,c,d) + x + t) <<< s) */
- #define HH(a,b,c,d,x,s,t)
- H(b,c,d);
- COM(a,b,x,s,t)
- /* Round 4 functions */
- /* edi = I(x,y,z) = y ^ (x | ~z) */
- #define I(x,y,z)
- mov edi,z;
- not edi;
- or edi,x;
- xor edi,y
- /* a = b + ((a + I(b,c,d) + x + t) <<< s) */
- #define II(a,b,c,d,x,s,t)
- I(b,c,d);
- COM(a,b,x,s,t)
- /* Register assignments */
- #define A eax
- #define B ebx
- #define C ecx
- #define D edx
- static void
- MD5Transform (state, block)
- UINT4 state[4];
- unsigned char block[64];
- {
- asm {
- /* Save caller's registers */
- push si;
- push edi;
- push ds;
- lds si,state; /* Read input state */
- mov A,dword ptr si[0*4]; /* A = state[0] */
- mov B,dword ptr si[1*4]; /* B = state[1] */
- mov C,dword ptr si[2*4]; /* C = state[2] */
- mov D,dword ptr si[3*4]; /* D = state[3] */
- lds si,block; /* Set up for data block read */
- /* The FF macro uses ebp as scratch. This makes our args
- * inaccessible until it is restored!
- */
- push ebp;
- /* Round 1. The *4 factors in the subscripts to si account for the
- * byte offsets of each long element in the input array. The input
- * is actually a byte array, but we can treat it directly as a long
- * array because MD5 is little-endian, like the 386/486.
- *
- * The only hazard is if the input buffer isn't 32-bit aligned,
- * things will run a little more slowly.
- */
- FF(A,B,C,D,si[ 0*4],S11,3614090360); /* 1 */
- FF(D,A,B,C,si[ 1*4],S12,3905402710); /* 2 */
- FF(C,D,A,B,si[ 2*4],S13, 606105819); /* 3 */
- FF(B,C,D,A,si[ 3*4],S14,3250441966); /* 4 */
- FF(A,B,C,D,si[ 4*4],S11,4118548399); /* 5 */
- FF(D,A,B,C,si[ 5*4],S12,1200080426); /* 6 */
- FF(C,D,A,B,si[ 6*4],S13,2821735955); /* 7 */
- FF(B,C,D,A,si[ 7*4],S14,4249261313); /* 8 */
- FF(A,B,C,D,si[ 8*4],S11,1770035416); /* 9 */
- FF(D,A,B,C,si[ 9*4],S12,2336552879); /* 10 */
- FF(C,D,A,B,si[10*4],S13,4294925233); /* 11 */
- FF(B,C,D,A,si[11*4],S14,2304563134); /* 12 */
- FF(A,B,C,D,si[12*4],S11,1804603682); /* 13 */
- FF(D,A,B,C,si[13*4],S12,4254626195); /* 14 */
- FF(C,D,A,B,si[14*4],S13,2792965006); /* 15 */
- FF(B,C,D,A,si[15*4],S14,1236535329); /* 16 */
- /* Round 2 */
- GG(A,B,C,D,si[ 1*4],S21,4129170786); /* 17 */
- GG(D,A,B,C,si[ 6*4],S22,3225465664); /* 18 */
- GG(C,D,A,B,si[11*4],S23, 643717713); /* 19 */
- GG(B,C,D,A,si[ 0*4],S24,3921069994); /* 20 */
- GG(A,B,C,D,si[ 5*4],S21,3593408605); /* 21 */
- GG(D,A,B,C,si[10*4],S22, 38016083); /* 22 */
- GG(C,D,A,B,si[15*4],S23,3634488961); /* 23 */
- GG(B,C,D,A,si[ 4*4],S24,3889429448); /* 24 */
- GG(A,B,C,D,si[ 9*4],S21, 568446438); /* 25 */
- GG(D,A,B,C,si[14*4],S22,3275163606); /* 26 */
- GG(C,D,A,B,si[ 3*4],S23,4107603335); /* 27 */
- GG(B,C,D,A,si[ 8*4],S24,1163531501); /* 28 */
- GG(A,B,C,D,si[13*4],S21,2850285829); /* 29 */
- GG(D,A,B,C,si[ 2*4],S22,4243563512); /* 30 */
- GG(C,D,A,B,si[ 7*4],S23,1735328473); /* 31 */
- GG(B,C,D,A,si[12*4],S24,2368359562); /* 32 */
- /* Round 3 */
- HH(A,B,C,D,si[ 5*4],S31,4294588738); /* 33 */
- HH(D,A,B,C,si[ 8*4],S32,2272392833); /* 34 */
- HH(C,D,A,B,si[11*4],S33,1839030562); /* 35 */
- HH(B,C,D,A,si[14*4],S34,4259657740); /* 36 */
- HH(A,B,C,D,si[ 1*4],S31,2763975236); /* 37 */
- HH(D,A,B,C,si[ 4*4],S32,1272893353); /* 38 */
- HH(C,D,A,B,si[ 7*4],S33,4139469664); /* 39 */
- HH(B,C,D,A,si[10*4],S34,3200236656); /* 40 */
- HH(A,B,C,D,si[13*4],S31, 681279174); /* 41 */
- HH(D,A,B,C,si[ 0*4],S32,3936430074); /* 42 */
- HH(C,D,A,B,si[ 3*4],S33,3572445317); /* 43 */
- HH(B,C,D,A,si[ 6*4],S34, 76029189); /* 44 */
- HH(A,B,C,D,si[ 9*4],S31,3654602809); /* 45 */
- HH(D,A,B,C,si[12*4],S32,3873151461); /* 46 */
- HH(C,D,A,B,si[15*4],S33, 530742520); /* 47 */
- HH(B,C,D,A,si[ 2*4],S34,3299628645); /* 48 */
- /* Round 4 */
- II(A,B,C,D,si[ 0*4],S41,4096336452); /* 49 */
- II(D,A,B,C,si[ 7*4],S42,1126891415); /* 50 */
- II(C,D,A,B,si[14*4],S43,2878612391); /* 51 */
- II(B,C,D,A,si[ 5*4],S44,4237533241); /* 52 */
- II(A,B,C,D,si[12*4],S41,1700485571); /* 53 */
- II(D,A,B,C,si[ 3*4],S42,2399980690); /* 54 */
- II(C,D,A,B,si[10*4],S43,4293915773); /* 55 */
- II(B,C,D,A,si[ 1*4],S44,2240044497); /* 56 */
- II(A,B,C,D,si[ 8*4],S41,1873313359); /* 57 */
- II(D,A,B,C,si[15*4],S42,4264355552); /* 58 */
- II(C,D,A,B,si[ 6*4],S43,2734768916); /* 59 */
- II(B,C,D,A,si[13*4],S44,1309151649); /* 60 */
- II(A,B,C,D,si[ 4*4],S41,4149444226); /* 61 */
- II(D,A,B,C,si[11*4],S42,3174756917); /* 62 */
- II(C,D,A,B,si[ 2*4],S43, 718787259); /* 63 */
- II(B,C,D,A,si[ 9*4],S44,3951481745); /* 64 */
- pop ebp; /* We can address our args again */
- lds si,state; /* Update the caller's state */
- add dword ptr si[0*4],A; /* state[0] += A */
- add dword ptr si[1*4],B; /* state[1] += B */
- add dword ptr si[2*4],C; /* state[2] += C */
- add dword ptr si[3*4],D; /* state[3] += D */
- /* Restore caller's registers */
- pop ds;
- pop edi;
- pop si;
- }
- }
- #endif /* CPU386 */