text: /*
   *Author:GeneralSandman
   *Code:https://github.com/GeneralSandman/TinyWeb
   *E-mail:generalsandman@163.com
   *Web:www.dissigil.cn
   */
  
  /*---XXX---
   *
   ****************************************
   *
   */
  
  
  #include <tiny_base/md5.h> 
  
  #include <stdio.h>
  #include <string.h>
  
  /*
   ***********************************************************************
   **  Message-digest routines:                                         **
   **  To form the message digest for a message M                       **
   **    (1) Initialize a context buffer mdContext using MD5Init        **
   **    (2) Call MD5Update on mdContext and M                          **
   **    (3) Call MD5Final on mdContext                                 **
   **  The message digest is now in mdContext->digest[0...15]           **
   ***********************************************************************
   */
  
  /* forward declaration */
  static void Transform (UINT4 *, UINT4 *);
  
  #ifdef	__STDC__
  static const
  #else
  static
  #endif
  unsigned char PADDING[64] = {
    0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  };
  
  /* 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 */
  #if	defined(FAST_MD5) && defined(__GNUC__) && defined(mc68000)
  /*
   * If we're on a 68000 based CPU and using a GNU C compiler with
   * inline assembly code, we can speed this up a bit.
   */
  inline UINT4 ROTATE_LEFT(UINT4 x, int n)
  {   
      asm("roll %2,%0" : "=d" (x) : "0" (x), "Ir" (n));
      return x;
  }
  #else
  #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  #endif
  
  
  /* 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); \
    }
  
  /* The routine MD5Init initializes the message-digest context
     mdContext. All fields are set to zero.
   */
  void MD5Init(MD5_CTX *mdContext)
  {
    mdContext->i[0] = mdContext->i[1] = (UINT4)0;
  
    /* Load magic initialization constants.
     */
    mdContext->buf[0] = (UINT4)0x67452301;
    mdContext->buf[1] = (UINT4)0xefcdab89;
    mdContext->buf[2] = (UINT4)0x98badcfe;
    mdContext->buf[3] = (UINT4)0x10325476;
  }
  
  /* The routine MD5Update updates the message-digest context to
     account for the presence of each of the characters inBuf[0..inLen-1]
     in the message whose digest is being computed.
   */
  void MD5Update(MD5_CTX *mdContext,
      unsigned const char *inBuf,
      unsigned int inLen)
  {
    UINT4 in[16];
    int mdi;
    unsigned int i, ii;
  
    /* compute number of bytes mod 64 */
    mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
  
    /* update number of bits */
    if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
      mdContext->i[1]++;
    mdContext->i[0] += ((UINT4)inLen << 3);
    mdContext->i[1] += ((UINT4)inLen >> 29);
  
    while (inLen--) {
      /* add new character to buffer, increment mdi */
      mdContext->in[mdi++] = *inBuf++;
  
      /* transform if necessary */
      if (mdi == 0x40) {
        for (i = 0, ii = 0; i < 16; i++, ii += 4)
          in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
                  (((UINT4)mdContext->in[ii+2]) << 16) |
                  (((UINT4)mdContext->in[ii+1]) << 8) |
                  ((UINT4)mdContext->in[ii]);
        Transform (mdContext->buf, in);
        mdi = 0;
      }
    }
  }
  
  /* The routine MD5Final terminates the message-digest computation and
     ends with the desired message digest in mdContext->digest[0...15].
   */
  
  void MD5Final(MD5_CTX *mdContext)
  {
    UINT4 in[16];
    int mdi;
    unsigned int i, ii;
    unsigned int padLen;
  
    /* save number of bits */
    in[14] = mdContext->i[0];
    in[15] = mdContext->i[1];
  
    /* compute number of bytes mod 64 */
    mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
  
    /* pad out to 56 mod 64 */
    padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
    MD5Update (mdContext, PADDING, padLen);
  
    /* append length in bits and transform */
    for (i = 0, ii = 0; i < 14; i++, ii += 4)
      in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
              (((UINT4)mdContext->in[ii+2]) << 16) |
              (((UINT4)mdContext->in[ii+1]) << 8) |
              ((UINT4)mdContext->in[ii]);
    Transform (mdContext->buf, in);
  
    /* store buffer in digest */
    for (i = 0, ii = 0; i < 4; i++, ii += 4) {
      mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
      mdContext->digest[ii+1] =
        (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
      mdContext->digest[ii+2] =
        (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
      mdContext->digest[ii+3] =
        (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
    }
  }
  
  /* Basic MD5 step. Transforms buf based on in.
   */
  static void Transform(UINT4 *buf, UINT4 *in)
  {
    UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
  
    /* Round 1 */
  #define S11 7
  #define S12 12
  #define S13 17
  #define S14 22
  
    FF ( a, b, c, d, in[ 0], S11, 0xd76aa478); /* 1 */
    FF ( d, a, b, c, in[ 1], S12, 0xe8c7b756); /* 2 */
    FF ( c, d, a, b, in[ 2], S13, 0x242070db); /* 3 */
    FF ( b, c, d, a, in[ 3], S14, 0xc1bdceee); /* 4 */
    FF ( a, b, c, d, in[ 4], S11, 0xf57c0faf); /* 5 */
    FF ( d, a, b, c, in[ 5], S12, 0x4787c62a); /* 6 */
    FF ( c, d, a, b, in[ 6], S13, 0xa8304613); /* 7 */
    FF ( b, c, d, a, in[ 7], S14, 0xfd469501); /* 8 */
    FF ( a, b, c, d, in[ 8], S11, 0x698098d8); /* 9 */
    FF ( d, a, b, c, in[ 9], S12, 0x8b44f7af); /* 10 */
    FF ( c, d, a, b, in[10], S13, 0xffff5bb1); /* 11 */
    FF ( b, c, d, a, in[11], S14, 0x895cd7be); /* 12 */
    FF ( a, b, c, d, in[12], S11, 0x6b901122); /* 13 */
    FF ( d, a, b, c, in[13], S12, 0xfd987193); /* 14 */
    FF ( c, d, a, b, in[14], S13, 0xa679438e); /* 15 */
    FF ( b, c, d, a, in[15], S14, 0x49b40821); /* 16 */
  
    /* Round 2 */
  #define S21 5
  #define S22 9
  #define S23 14
  #define S24 20
    GG ( a, b, c, d, in[ 1], S21, 0xf61e2562); /* 17 */
    GG ( d, a, b, c, in[ 6], S22, 0xc040b340); /* 18 */
    GG ( c, d, a, b, in[11], S23, 0x265e5a51); /* 19 */
    GG ( b, c, d, a, in[ 0], S24, 0xe9b6c7aa); /* 20 */
    GG ( a, b, c, d, in[ 5], S21, 0xd62f105d); /* 21 */
    GG ( d, a, b, c, in[10], S22,  0x2441453); /* 22 */
    GG ( c, d, a, b, in[15], S23, 0xd8a1e681); /* 23 */
    GG ( b, c, d, a, in[ 4], S24, 0xe7d3fbc8); /* 24 */
    GG ( a, b, c, d, in[ 9], S21, 0x21e1cde6); /* 25 */
    GG ( d, a, b, c, in[14], S22, 0xc33707d6); /* 26 */
    GG ( c, d, a, b, in[ 3], S23, 0xf4d50d87); /* 27 */
    GG ( b, c, d, a, in[ 8], S24, 0x455a14ed); /* 28 */
    GG ( a, b, c, d, in[13], S21, 0xa9e3e905); /* 29 */
    GG ( d, a, b, c, in[ 2], S22, 0xfcefa3f8); /* 30 */
    GG ( c, d, a, b, in[ 7], S23, 0x676f02d9); /* 31 */
    GG ( b, c, d, a, in[12], S24, 0x8d2a4c8a); /* 32 */
  
    /* Round 3 */
  #define S31 4
  #define S32 11
  #define S33 16
  #define S34 23
    HH ( a, b, c, d, in[ 5], S31, 0xfffa3942); /* 33 */
    HH ( d, a, b, c, in[ 8], S32, 0x8771f681); /* 34 */
    HH ( c, d, a, b, in[11], S33, 0x6d9d6122); /* 35 */
    HH ( b, c, d, a, in[14], S34, 0xfde5380c); /* 36 */
    HH ( a, b, c, d, in[ 1], S31, 0xa4beea44); /* 37 */
    HH ( d, a, b, c, in[ 4], S32, 0x4bdecfa9); /* 38 */
    HH ( c, d, a, b, in[ 7], S33, 0xf6bb4b60); /* 39 */
    HH ( b, c, d, a, in[10], S34, 0xbebfbc70); /* 40 */
    HH ( a, b, c, d, in[13], S31, 0x289b7ec6); /* 41 */
    HH ( d, a, b, c, in[ 0], S32, 0xeaa127fa); /* 42 */
    HH ( c, d, a, b, in[ 3], S33, 0xd4ef3085); /* 43 */
    HH ( b, c, d, a, in[ 6], S34,  0x4881d05); /* 44 */
    HH ( a, b, c, d, in[ 9], S31, 0xd9d4d039); /* 45 */
    HH ( d, a, b, c, in[12], S32, 0xe6db99e5); /* 46 */
    HH ( c, d, a, b, in[15], S33, 0x1fa27cf8); /* 47 */
    HH ( b, c, d, a, in[ 2], S34, 0xc4ac5665); /* 48 */
  
    /* Round 4 */
  #define S41 6
  #define S42 10
  #define S43 15
  #define S44 21
    II ( a, b, c, d, in[ 0], S41, 0xf4292244); /* 49 */
    II ( d, a, b, c, in[ 7], S42, 0x432aff97); /* 50 */
    II ( c, d, a, b, in[14], S43, 0xab9423a7); /* 51 */
    II ( b, c, d, a, in[ 5], S44, 0xfc93a039); /* 52 */
    II ( a, b, c, d, in[12], S41, 0x655b59c3); /* 53 */
    II ( d, a, b, c, in[ 3], S42, 0x8f0ccc92); /* 54 */
    II ( c, d, a, b, in[10], S43, 0xffeff47d); /* 55 */
    II ( b, c, d, a, in[ 1], S44, 0x85845dd1); /* 56 */
    II ( a, b, c, d, in[ 8], S41, 0x6fa87e4f); /* 57 */
    II ( d, a, b, c, in[15], S42, 0xfe2ce6e0); /* 58 */
    II ( c, d, a, b, in[ 6], S43, 0xa3014314); /* 59 */
    II ( b, c, d, a, in[13], S44, 0x4e0811a1); /* 60 */
    II ( a, b, c, d, in[ 4], S41, 0xf7537e82); /* 61 */
    II ( d, a, b, c, in[11], S42, 0xbd3af235); /* 62 */
    II ( c, d, a, b, in[ 2], S43, 0x2ad7d2bb); /* 63 */
    II ( b, c, d, a, in[ 9], S44, 0xeb86d391); /* 64 */
  
    buf[0] += a;
    buf[1] += b;
    buf[2] += c;
    buf[3] += d;
  }
  
  void md5(const char* key, int len, char* dst)
  {
      static MD5_CTX ctx;
      MD5Init(&ctx);
      MD5Update(&ctx, (unsigned char*)key, len);
      MD5Final(&ctx);
  
      unsigned char tmp1[16];
      char res[32];
      memset(tmp1, 0, 16);
      memset(res, 0, 32);
  
      memcpy(tmp1, ctx.digest, 16);
      for (int i = 0; i < 16; i++) {
          sprintf(&(res[2 * i]), "%02x", (unsigned char)tmp1[i]);
          sprintf(&(res[2 * i + 1]), "%02x", (unsigned char)(tmp1[i] << 4));
      }
  
      memset(dst, 0, strlen(dst));
      memcpy(dst, res, 32);
  }
  
  