/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org *//* MD5 hash function by Tom St Denis */#include "md5.h"#ifdef MD5#define F(x,y,z)  (z ^ (x & (y ^ z)))#define G(x,y,z)  (y ^ (z & (y ^ x)))#define H(x,y,z)  (x^y^z)#define I(x,y,z)  (y^(x|(~z)))#define FF(a,b,c,d,M,s,t) \    a = (a + F(b,c,d) + M + t); a = ROL(a, s) + b;   #define GG(a,b,c,d,M,s,t) \    a = (a + G(b,c,d) + M + t); a = ROL(a, s) + b;#define HH(a,b,c,d,M,s,t) \    a = (a + H(b,c,d) + M + t); a = ROL(a, s) + b;#define II(a,b,c,d,M,s,t) \    a = (a + I(b,c,d) + M + t); a = ROL(a, s) + b;#ifdef SMALL_CODEstatic const unsigned char Worder[64] = {   0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,   1,6,11,0,5,10,15,4,9,14,3,8,13,2,7,12,   5,8,11,14,1,4,7,10,13,0,3,6,9,12,15,2,   0,7,14,5,12,3,10,1,8,15,6,13,4,11,2,9};static const unsigned char Rorder[64] = {   7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,   5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,   4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,   6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21};static const ulong32 Korder[64] = {0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL, 0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL, 0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL, 0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL, 0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL, 0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL, 0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL, 0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL, 0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL};#endif   #include <signal.h>#if (ARGTYPE == 0)void crypt_argchk(char *v, char *s, int d){ fprintf(stderr, "_ARGCHK '%s' failure on line %d of file %s\n",         v, d, s); (void)raise(SIGABRT);}#endifvoid zeromem(void *dst, size_t len){ unsigned char *mem = (unsigned char *)dst; _ARGCHK(dst != NULL); while (len-- > 0)    *mem++ = 0;}void burn_stack(unsigned long len){   unsigned char buf[32];   zeromem(buf, sizeof(buf));   if (len > (unsigned long)sizeof(buf))      burn_stack(len - sizeof(buf));}/*this function compress 512bits once,and it is called by md5_process and md5_done*/#ifdef CLEAN_STACKstatic void _md5_compress(md5_state *md, unsigned char *buf)#elsestatic void md5_compress(md5_state *md, unsigned char *buf)#endif{    ulong32 i, W[16], a, b, c, d;#ifdef SMALL_CODE    ulong32 t;#endif    /* copy the state into 512-bits into W[0..15] */    for (i = 0; i < 16; i++) {        LOAD32L(W[i], buf + (4*i));    }     /* copy state */    a = md->state[0];    b = md->state[1];    c = md->state[2];    d = md->state[3];#ifdef SMALL_CODE    for (i = 0; i < 16; ++i) {                         /*第一輪變換*/        FF(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);          t = d; d = c; c = b; b = a; a = t;    }    for (; i < 32; ++i) {                             /*第二輪變換*/        GG(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);        t = d; d = c; c = b; b = a; a = t;    }    for (; i < 48; ++i) {                            /*第三輪變換*/        HH(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);        t = d; d = c; c = b; b = a; a = t;    }    for (; i < 64; ++i) {                           /*第四輪變換*/        II(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);        t = d; d = c; c = b; b = a; a = t;    }#else    FF(a,b,c,d,W[0],7,0xd76aa478UL)    /*第一輪變換開始*/    FF(d,a,b,c,W[1],12,0xe8c7b756UL)    FF(c,d,a,b,W[2],17,0x242070dbUL)    FF(b,c,d,a,W[3],22,0xc1bdceeeUL)    FF(a,b,c,d,W[4],7,0xf57c0fafUL)    FF(d,a,b,c,W[5],12,0x4787c62aUL)    FF(c,d,a,b,W[6],17,0xa8304613UL)    FF(b,c,d,a,W[7],22,0xfd469501UL)    FF(a,b,c,d,W[8],7,0x698098d8UL)    FF(d,a,b,c,W[9],12,0x8b44f7afUL)    FF(c,d,a,b,W[10],17,0xffff5bb1UL)    FF(b,c,d,a,W[11],22,0x895cd7beUL)    FF(a,b,c,d,W[12],7,0x6b901122UL)    FF(d,a,b,c,W[13],12,0xfd987193UL)    FF(c,d,a,b,W[14],17,0xa679438eUL)    FF(b,c,d,a,W[15],22,0x49b40821UL)  /*第一輪變換結(jié)束*/    GG(a,b,c,d,W[1],5,0xf61e2562UL)    /*第二輪變換開始*/    GG(d,a,b,c,W[6],9,0xc040b340UL)    GG(c,d,a,b,W[11],14,0x265e5a51UL)    GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)    GG(a,b,c,d,W[5],5,0xd62f105dUL)    GG(d,a,b,c,W[10],9,0x02441453UL)    GG(c,d,a,b,W[15],14,0xd8a1e681UL)    GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)    GG(a,b,c,d,W[9],5,0x21e1cde6UL)    GG(d,a,b,c,W[14],9,0xc33707d6UL)    GG(c,d,a,b,W[3],14,0xf4d50d87UL)    GG(b,c,d,a,W[8],20,0x455a14edUL)    GG(a,b,c,d,W[13],5,0xa9e3e905UL)    GG(d,a,b,c,W[2],9,0xfcefa3f8UL)    GG(c,d,a,b,W[7],14,0x676f02d9UL)    GG(b,c,d,a,W[12],20,0x8d2a4c8aUL) /*第二輪變換結(jié)束*/    HH(a,b,c,d,W[5],4,0xfffa3942UL)   /*第三輪變換開始*/    HH(d,a,b,c,W[8],11,0x8771f681UL)    HH(c,d,a,b,W[11],16,0x6d9d6122UL)    HH(b,c,d,a,W[14],23,0xfde5380cUL)    HH(a,b,c,d,W[1],4,0xa4beea44UL)    HH(d,a,b,c,W[4],11,0x4bdecfa9UL)    HH(c,d,a,b,W[7],16,0xf6bb4b60UL)    HH(b,c,d,a,W[10],23,0xbebfbc70UL)    HH(a,b,c,d,W[13],4,0x289b7ec6UL)    HH(d,a,b,c,W[0],11,0xeaa127faUL)    HH(c,d,a,b,W[3],16,0xd4ef3085UL)    HH(b,c,d,a,W[6],23,0x04881d05UL)    HH(a,b,c,d,W[9],4,0xd9d4d039UL)    HH(d,a,b,c,W[12],11,0xe6db99e5UL)    HH(c,d,a,b,W[15],16,0x1fa27cf8UL)    HH(b,c,d,a,W[2],23,0xc4ac5665UL)  /*第三輪變換結(jié)束*/    II(a,b,c,d,W[0],6,0xf4292244UL)   /*第四輪變換開始*/    II(d,a,b,c,W[7],10,0x432aff97UL)    II(c,d,a,b,W[14],15,0xab9423a7UL)    II(b,c,d,a,W[5],21,0xfc93a039UL)    II(a,b,c,d,W[12],6,0x655b59c3UL)    II(d,a,b,c,W[3],10,0x8f0ccc92UL)    II(c,d,a,b,W[10],15,0xffeff47dUL)    II(b,c,d,a,W[1],21,0x85845dd1UL)    II(a,b,c,d,W[8],6,0x6fa87e4fUL)    II(d,a,b,c,W[15],10,0xfe2ce6e0UL)    II(c,d,a,b,W[6],15,0xa3014314UL)    II(b,c,d,a,W[13],21,0x4e0811a1UL)    II(a,b,c,d,W[4],6,0xf7537e82UL)    II(d,a,b,c,W[11],10,0xbd3af235UL)    II(c,d,a,b,W[2],15,0x2ad7d2bbUL)    II(b,c,d,a,W[9],21,0xeb86d391UL)   /*第四輪變換結(jié)束*/#endif    md->state[0] = md->state[0] + a;    md->state[1] = md->state[1] + b;    md->state[2] = md->state[2] + c;    md->state[3] = md->state[3] + d;}#ifdef CLEAN_STACKstatic void md5_compress(md5_state *md, unsigned char *buf){   _md5_compress(md, buf);   burn_stack(sizeof(ulong32) * 21);}#endifvoid md5_init(md5_state * md){   _ARGCHK(md != NULL);   md->state[0] = 0x67452301UL;   /*四個(gè)鏈接變量*/   md->state[1] = 0xefcdab89UL;   md->state[2] = 0x98badcfeUL;   md->state[3] = 0x10325476UL;   md->curlen = 0;   md->length = 0;}/*假設(shè)信息的長(zhǎng)度為n×512＋l（0<=l<512)。這個(gè)函數(shù)處理前面的n×512比特，留下的由md5_done函數(shù)完成。  */                   int md5_process (md5_state * md, const unsigned char *buf, unsigned long len)              {                                                                                               unsigned long n;                                                                            _ARGCHK(md != NULL);                                                                       _ARGCHK(buf != NULL);                                                                      if (md->curlen > sizeof(md->buf)) {                                    return CRYPT_INVALID_ARG;                                                                }                                                                                           while (len > 0) {                                                                               if (md->curlen == 0 && len >= len) {                                        md5_compress (md, (unsigned char *)buf);                                                   md->length += len * 8;                                                   buf             += len;                                                              len             -= len;                                                           } else {                                                                                       n = MIN(len, (len - md->curlen));                                        memcpy(md->buf + md->curlen, buf, (size_t)n);                        md->curlen += n;                                                                buf+= n;                                                                       len-= n;                                                                       if (md->curlen == len) {                                                    md5_compress (md, md->buf);                                                    md->length += 8*len;                                                     md->curlen = 0;                                                              }                                                                                       }                                                                                        }                                                                                           return CRYPT_OK;                                                                        }int md5_done(md5_state * md, unsigned char *hash){    int i;    _ARGCHK(md != NULL);    _ARGCHK(hash != NULL);    if (md->curlen >= sizeof(md->buf)) {       return CRYPT_INVALID_ARG;    }        md->length += md->curlen * 8;    /* append the '1' bit */    md->buf[md->curlen++] = (unsigned char)0x80;    /* if the length is currently above 56 bytes we append zeros     * then compress.  Then we can fall back to padding zeros and length     * encoding like normal.     */    if (md->curlen > 56) {        while (md->curlen < 64) {            md->buf[md->curlen++] = (unsigned char)0;        }        md5_compress(md, md->buf);        md->curlen = 0;    }    /* pad upto 56 bytes of zeroes */    while (md->curlen < 56) {        md->buf[md->curlen++] = (unsigned char)0;    }    /* store length */    STORE64L(md->length, md->buf+56);    md5_compress(md, md->buf);    /* copy output */    for (i = 0; i < 4; i++) {        STORE32L(md->state[i], hash+(4*i));    }#ifdef CLEAN_STACK    zeromem(md, sizeof(md5_state));#endif    return CRYPT_OK;}int  md5_test(void){ #ifndef LTC_TEST    return CRYPT_NOP; #else      static const struct {      char *msg;      unsigned char hash[16];  } tests[] = {    { "",      { 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,         0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e } },    { "a",      {0x0c, 0xc1, 0x75, 0xb9, 0xc0, 0xf1, 0xb6, 0xa8,        0x31, 0xc3, 0x99, 0xe2, 0x69, 0x77, 0x26, 0x61 } },    { "abc",      { 0x90, 0x01, 0x50, 0x98, 0x3c, 0xd2, 0x4f, 0xb0,         0xd6, 0x96, 0x3f, 0x7d, 0x28, 0xe1, 0x7f, 0x72 } },    { "message digest",       { 0xf9, 0x6b, 0x69, 0x7d, 0x7c, 0xb7, 0x93, 0x8d,         0x52, 0x5a, 0x2f, 0x31, 0xaa, 0xf1, 0x61, 0xd0 } },     { "abcdefghijklmnopqrstuvwxyz",      { 0xc3, 0xfc, 0xd3, 0xd7, 0x61, 0x92, 0xe4, 0x00,         0x7d, 0xfb, 0x49, 0x6c, 0xca, 0x67, 0xe1, 0x3b } },    { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",      { 0xd1, 0x74, 0xab, 0x98, 0xd2, 0x77, 0xd9, 0xf5,         0xa5, 0x61, 0x1c, 0x2c, 0x9f, 0x41, 0x9d, 0x9f } },    { "12345678901234567890123456789012345678901234567890123456789012345678901234567890",      { 0x57, 0xed, 0xf4, 0xa2, 0x2b, 0xe3, 0xc9, 0x55,         0xac, 0x49, 0xda, 0x2e, 0x21, 0x07, 0xb6, 0x7a } },     { NULL, { 0 } }  };  int i;  unsigned char tmp[16];  md5_state md;  for (i = 0; tests[i].msg != NULL; i++) {      md5_init(&md);      md5_process(&md, (unsigned char *)tests[i].msg, (unsigned long)strlen(tests[i].msg));      md5_done(&md, tmp);      if (memcmp(tmp, tests[i].hash, 16) != 0) {         return CRYPT_FAIL_TESTVECTOR;      }  }  return CRYPT_OK; #endif}#endif