/*
 * @Description: 工具模块-MD5子模块
 * @Author: yangsw
 * @Date: 2021-06-22 12:17:44
 * @LastEditTime: 2021-07-13 15:00:39
 * @LastEditors: yangsw
 * @Reference: 
 */

#include "util_md5.h"
#include <string.h>


 
static gw_u8 PADDING[]={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};
                         
void  Util_Md5_Init(MD5_CTX *context)
{
     context->count[0] = 0;
     context->count[1] = 0;
     context->state[0] = 0x67452301;
     context->state[1] = 0xEFCDAB89;
     context->state[2] = 0x98BADCFE;
     context->state[3] = 0x10325476;
}
void  Util_Md5_Update(MD5_CTX *context,gw_u8 *input,gw_u32 inputlen)
{
    gw_u32 i = 0,index = 0,partlen = 0;
    index = (context->count[0] >> 3) & 0x3F;
    partlen = 64 - index;
    context->count[0] += inputlen << 3;
    if(context->count[0] < (inputlen << 3))
       context->count[1]++;
    context->count[1] += inputlen >> 29;
    
    if(inputlen >= partlen)
    {
       memcpy(&context->buffer[index],input,partlen);
       Md5_Transform(context->state,context->buffer);
       for(i = partlen;i+64 <= inputlen;i+=64)
           Md5_Transform(context->state,&input[i]);
       index = 0;        
    }  
    else
    {
        i = 0;
    }
    memcpy(&context->buffer[index],&input[i],inputlen-i);
}
void  Util_Md5_Final(MD5_CTX *context,gw_u8 digest[16])
{
    gw_u32 index = 0,padlen = 0;
    gw_u8 bits[8];
    index = (context->count[0] >> 3) & 0x3F;
    padlen = (index < 56)?(56-index):(120-index);
    Md5_Encode(bits,context->count,8);
    Util_Md5_Update(context,PADDING,padlen);
    Util_Md5_Update(context,bits,8);
    Md5_Encode(digest,context->state,16);
}
void  Md5_Encode(gw_u8 *output,gw_u32 *input,gw_u32 len)
{
    gw_u32 i = 0,j = 0;
    while(j < len)
    {
         output[j] = input[i] & 0xFF;  
         output[j+1] = (input[i] >> 8) & 0xFF;
         output[j+2] = (input[i] >> 16) & 0xFF;
         output[j+3] = (input[i] >> 24) & 0xFF;
         i++;
         j+=4;
    }
}
void  Md5_Decode(gw_u32 *output,gw_u8 *input,gw_u32 len)
{
     gw_u32 i = 0,j = 0;
     while(j < len)
     {
           output[i] = (input[j]) |
                       (input[j+1] << 8) |
                       (input[j+2] << 16) |
                       (input[j+3] << 24);
           i++;
           j+=4; 
     }
}
void  Md5_Transform(gw_u32 state[4],gw_u8 block[64])
{
     gw_u32 a = state[0];
     gw_u32 b = state[1];
     gw_u32 c = state[2];
     gw_u32 d = state[3];
     gw_u32 x[64];
     Md5_Decode(x,block,64);
     FF(a, b, c, d, x[ 0], 7, 0xd76aa478); /* 1 */
 FF(d, a, b, c, x[ 1], 12, 0xe8c7b756); /* 2 */
 FF(c, d, a, b, x[ 2], 17, 0x242070db); /* 3 */
 FF(b, c, d, a, x[ 3], 22, 0xc1bdceee); /* 4 */
 FF(a, b, c, d, x[ 4], 7, 0xf57c0faf); /* 5 */
 FF(d, a, b, c, x[ 5], 12, 0x4787c62a); /* 6 */
 FF(c, d, a, b, x[ 6], 17, 0xa8304613); /* 7 */
 FF(b, c, d, a, x[ 7], 22, 0xfd469501); /* 8 */
 FF(a, b, c, d, x[ 8], 7, 0x698098d8); /* 9 */
 FF(d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */
 FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */
 FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */
 FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */
 FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */
 FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */
 FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 */
 
 /* Round 2 */
 GG(a, b, c, d, x[ 1], 5, 0xf61e2562); /* 17 */
 GG(d, a, b, c, x[ 6], 9, 0xc040b340); /* 18 */
 GG(c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */
 GG(b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /* 20 */
 GG(a, b, c, d, x[ 5], 5, 0xd62f105d); /* 21 */
 GG(d, a, b, c, x[10], 9,  0x2441453); /* 22 */
 GG(c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */
 GG(b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /* 24 */
 GG(a, b, c, d, x[ 9], 5, 0x21e1cde6); /* 25 */
 GG(d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */
 GG(c, d, a, b, x[ 3], 14, 0xf4d50d87); /* 27 */
 GG(b, c, d, a, x[ 8], 20, 0x455a14ed); /* 28 */
 GG(a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */
 GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8); /* 30 */
 GG(c, d, a, b, x[ 7], 14, 0x676f02d9); /* 31 */
 GG(b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */
 
 /* Round 3 */
 HH(a, b, c, d, x[ 5], 4, 0xfffa3942); /* 33 */
 HH(d, a, b, c, x[ 8], 11, 0x8771f681); /* 34 */
 HH(c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */
 HH(b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */
 HH(a, b, c, d, x[ 1], 4, 0xa4beea44); /* 37 */
 HH(d, a, b, c, x[ 4], 11, 0x4bdecfa9); /* 38 */
 HH(c, d, a, b, x[ 7], 16, 0xf6bb4b60); /* 39 */
 HH(b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */
 HH(a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */
 HH(d, a, b, c, x[ 0], 11, 0xeaa127fa); /* 42 */
 HH(c, d, a, b, x[ 3], 16, 0xd4ef3085); /* 43 */
 HH(b, c, d, a, x[ 6], 23,  0x4881d05); /* 44 */
 HH(a, b, c, d, x[ 9], 4, 0xd9d4d039); /* 45 */
 HH(d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */
 HH(c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */
 HH(b, c, d, a, x[ 2], 23, 0xc4ac5665); /* 48 */
 
 /* Round 4 */
 II(a, b, c, d, x[ 0], 6,  0xf4292244); /* 49 */
 II(d, a, b, c, x[ 7], 10, 0x432aff97); /* 50 */
 II(c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */
 II(b, c, d, a, x[ 5], 21, 0xfc93a039); /* 52 */
 II(a, b, c, d, x[12], 6,  0x655b59c3); /* 53 */
 II(d, a, b, c, x[ 3], 10, 0x8f0ccc92); /* 54 */
 II(c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */
 II(b, c, d, a, x[ 1], 21, 0x85845dd1); /* 56 */
 II(a, b, c, d, x[ 8], 6,  0x6fa87e4f); /* 57 */
 II(d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */
 II(c, d, a, b, x[ 6], 15, 0xa3014314); /* 59 */
 II(b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */
 II(a, b, c, d, x[ 4], 6,  0xf7537e82); /* 61 */
 II(d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */
 II(c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /* 63 */
 II(b, c, d, a, x[ 9], 21, 0xeb86d391); /* 64 */
     state[0] += a;
     state[1] += b;
     state[2] += c;
     state[3] += d;
}