MD5 小写 C语言

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*
#ifndef MD5_H
#define MD5_H

#ifdef __alpha
typedef unsigned int uint32;
#else
typedef unsigned long uint32;
#endif

struct MD5Context 
{
 uint32 buf[4];
 uint32 bits[2];
 unsigned char in[64];
};

extern void MD5Init();
extern void MD5Update();
extern void MD5Final();
extern void MD5Transform();
typedef struct MD5Context MD5_CTX;
#endif

#ifdef sgi
#define HIGHFIRST
#endif

#ifdef sun

#define HIGHFIRST
#endif

#ifndef HIGHFIRST
#define byteReverse(buf, len)   
#else

void byteReverse(buf, longs)unsignedchar*buf;unsignedlongs;
{
    uint32 t;
   do{
    t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |((unsigned) buf[1] << 8 | buf[0]);

    *(uint32 *) buf = t;
    buf += 4;
    }while(--longs);
}
#endif

void MD5Init(ctx) struct MD5Context *ctx;
{
    ctx->buf[0] = 0x67452301;
    ctx->buf[1] = 0xefcdab89;
    ctx->buf[2] = 0x98badcfe;
    ctx->buf[3] = 0x10325476;
    ctx->bits[0] = 0;
    ctx->bits[1] = 0;
}

void MD5Update(ctx, buf, len) struct MD5Context *ctx;