头文件

#ifndef __BSP_ECU_H__
#define __BSP_ECU_H__

#include "sys.h"


#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)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }


typedef struct {
    uint32_t state[4];
    uint32_t count[2];
    uint8_t buffer[64];
} MD5_CTX;

/* MD5 函数声明 */
void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context, const uint8_t *input, unsigned int inputLen);
void MD5Final(uint8_t digest[16], MD5_CTX *context);
void yc_old_algorithm(uint32_t seed, uint32_t mask, char *out_str);
void process_old_md5(const char *mapped_str, uint32_t gpsid);

#endif  // __BSP_ECU_H__

C文件

#include "bsp_ecu.h"
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include "usart.h"
/* 映射表 */
static const char map_table[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

static void Encode(uint8_t *output, const uint32_t *input, unsigned int len)
{
    unsigned int i, j;
    for(i=0, j=0; j<len; i++, j+=4){
        output[j]   = (uint8_t)(input[i] & 0xff);
        output[j+1] = (uint8_t)((input[i] >> 8) & 0xff);
        output[j+2] = (uint8_t)((input[i] >> 16) & 0xff);
        output[j+3] = (uint8_t)((input[i] >> 24) & 0xff);
    }
}

static void Decode(uint32_t *output, const uint8_t *input, unsigned int len)
{
    unsigned int i, j;
    for(i=0, j=0; j<len; i++, j+=4)
        output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
                    (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
}

static void MD5_memcpy(uint8_t *output, const uint8_t *input, unsigned int len)
{
    unsigned int i;
    for (i=0; i<len; i++) output[i] = input[i];
}

static void MD5_memset(uint8_t *output, int value, unsigned int len)
{
    unsigned int i;
    for (i=0; i<len; i++) ((char*)output)[i] = (char)value;
}

/* 核心变换函数 */
static void MD5Transform(uint32_t state[4], const uint8_t block[64])
{
    uint32_t 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], 7, 0xd76aa478); FF(d, a, b, c, x[ 1],12, 0xe8c7b756);
    FF(c, d, a, b, x[ 2],17, 0x242070db); FF(b, c, d, a, x[ 3],22, 0xc1bdceee);
    FF(a, b, c, d, x[ 4], 7, 0xf57c0faf); FF(d, a, b, c, x[ 5],12, 0x4787c62a);
    FF(c, d, a, b, x[ 6],17, 0xa8304613); FF(b, c, d, a, x[ 7],22, 0xfd469501);
    FF(a, b, c, d, x[ 8], 7, 0x698098d8); FF(d, a, b, c, x[ 9],12, 0x8b44f7af);
    FF(c, d, a, b, x[10],17, 0xffff5bb1); FF(b, c, d, a, x[11],22, 0x895cd7be);
    FF(a, b, c, d, x[12], 7, 0x6b901122); FF(d, a, b, c, x[13],12, 0xfd987193);
    FF(c, d, a, b, x[14],17, 0xa679438e); FF(b, c, d, a, x[15],22, 0x49b40821);
    /* Round 2 */
    GG(a, b, c, d, x[ 1], 5, 0xf61e2562); GG(d, a, b, c, x[ 6], 9, 0xc040b340);
    GG(c, d, a, b, x[11],14, 0x265e5a51); GG(b, c, d, a, x[ 0],20, 0xe9b6c7aa);
    GG(a, b, c, d, x[ 5], 5, 0xd62f105d); GG(d, a, b, c, x[10], 9, 0x02441453);
    GG(c, d, a, b, x[15],14, 0xd8a1e681); GG(b, c, d, a, x[ 4],20, 0xe7d3fbc8);
    GG(a, b, c, d, x[ 9], 5, 0x21e1cde6); GG(d, a, b, c, x[14], 9, 0xc33707d6);
    GG(c, d, a, b, x[ 3],14, 0xf4d50d87); GG(b, c, d, a, x[ 8],20, 0x455a14ed);
    GG(a, b, c, d, x[13], 5, 0xa9e3e905); GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8);
    GG(c, d, a, b, x[ 7],14, 0x676f02d9); GG(b, c, d, a, x[12],20, 0x8d2a4c8a);
    /* Round 3 */
    HH(a, b, c, d, x[ 5], 4, 0xfffa3942); HH(d, a, b, c, x[ 8],11, 0x8771f681);
    HH(c, d, a, b, x[11],16, 0x6d9d6122); HH(b, c, d, a, x[14],23, 0xfde5380c);
    HH(a, b, c, d, x[ 1], 4, 0xa4beea44); HH(d, a, b, c, x[ 4],11, 0x4bdecfa9);
    HH(c, d, a, b, x[ 7],16, 0xf6bb4b60); HH(b, c, d, a, x[10],23, 0xbebfbc70);
    HH(a, b, c, d, x[13], 4, 0x289b7ec6); HH(d, a, b, c, x[ 0],11, 0xeaa127fa);
    HH(c, d, a, b, x[ 3],16, 0xd4ef3085); HH(b, c, d, a, x[ 6],23, 0x04881d05);
    HH(a, b, c, d, x[ 9], 4, 0xd9d4d039); HH(d, a, b, c, x[12],11, 0xe6db99e5);
    HH(c, d, a, b, x[15],16, 0x1fa27cf8); HH(b, c, d, a, x[ 2],23, 0xc4ac5665);
    /* Round 4 */
    II(a, b, c, d, x[ 0], 6, 0xf4292244); II(d, a, b, c, x[ 7],10, 0x432aff97);
    II(c, d, a, b, x[14],15, 0xab9423a7); II(b, c, d, a, x[ 5],21, 0xfc93a039);
    II(a, b, c, d, x[12], 6, 0x655b59c3); II(d, a, b, c, x[ 3],10, 0x8f0ccc92);
    II(c, d, a, b, x[10],15, 0xffeff47d); II(b, c, d, a, x[ 1],21, 0x85845dd1);
    II(a, b, c, d, x[ 8], 6, 0x6fa87e4f); II(d, a, b, c, x[15],10, 0xfe2ce6e0);
    II(c, d, a, b, x[ 6],15, 0xa3014314); II(b, c, d, a, x[13],21, 0x4e0811a1);
    II(a, b, c, d, x[ 4], 6, 0xf7537e82); II(d, a, b, c, x[11],10, 0xbd3af235);
    II(c, d, a, b, x[ 2],15, 0x2ad7d2bb); II(b, c, d, a, x[ 9],21, 0xeb86d391);

    state[0] += a; state[1] += b; state[2] += c; state[3] += d;
    MD5_memset((uint8_t*)x, 0, sizeof(x));
}

void MD5Init(MD5_CTX *context)
{
    context->count[0] = context->count[1] = 0;
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
}

void MD5Update(MD5_CTX *context, const uint8_t *input, unsigned int inputLen)
{
    unsigned int i, index, partLen;
    index = (unsigned int)((context->count[0] >> 3) & 0x3F);
    if((context->count[0] += ((uint32_t)inputLen << 3)) < ((uint32_t)inputLen << 3))
        context->count[1]++;
    context->count[1] += ((uint32_t)inputLen >> 29);
    partLen = 64 - index;
    if(inputLen >= partLen){
        MD5_memcpy(&context->buffer[index], input, partLen);
        MD5Transform(context->state, context->buffer);
        for(i=partLen; i+63 < inputLen; i+=64)
            MD5Transform(context->state, &input[i]);
        index = 0;
    } else {
        i=0;
    }
    MD5_memcpy(&context->buffer[index], &input[i], inputLen - i);
}

void MD5Final(uint8_t digest[16], MD5_CTX *context)
{
    uint8_t bits[8];
    unsigned int index, padLen;
    static uint8_t PADDING[64] = { 0x80 };
    Encode(bits, context->count, 8);
    index = (unsigned int)((context->count[0] >> 3) & 0x3f);
    padLen = (index < 56) ? (56 - index) : (120 - index);
    MD5Update(context, PADDING, padLen);
    MD5Update(context, bits, 8);
    Encode(digest, context->state, 16);
    MD5_memset((uint8_t*)context, 0, sizeof (*context));
}

/* ========== 旧算法 ========== */
void yc_old_algorithm(uint32_t seed, uint32_t mask, char *out_str)
{
    uint8_t nums[8];
    nums[0] = (seed >>  0) & 0xFF;
    nums[1] = (seed >>  8) & 0xFF;
    nums[2] = (seed >> 16) & 0xFF;
    nums[3] = (seed >> 24) & 0xFF;
    nums[4] = (mask >>  0) & 0xFF;
    nums[5] = (mask >>  8) & 0xFF;
    nums[6] = (mask >> 16) & 0xFF;
    nums[7] = (mask >> 24) & 0xFF;

    for(int i=0; i<8; i++){
        while(nums[i] >= 62) nums[i] -= 62;
        out_str[i] = map_table[ nums[i] ];
    }
    out_str[8] = '\0';
}

void process_old_md5(const char *mapped_str, uint32_t gpsid) {
        uint8_t mima_str[40];
    uint8_t md5[16];
    uint8_t mid[8];
    uint8_t rev[8];
    uint8_t key[8];

    MD5_CTX ctx;
    MD5Init(&ctx);
    MD5Update(&ctx, (const uint8_t*)mapped_str, strlen(mapped_str));
    MD5Final(md5, &ctx);
    memcpy(mid, &md5[4], 8);
    for (int i = 0; i < 8; i++) {rev[i] = mid[7 - i];}

    key[7] = (gpsid >> 24) & 0xFF;
    key[6] = rev[2];
    key[5] = (gpsid >> 16) & 0xFF;
    key[4] = rev[3];
    key[3] = (gpsid >> 8) & 0xFF;
    key[2] = rev[4];
    key[1] = gpsid & 0xFF;
    key[0] = rev[5];
    printf("UnActice Key: %02X%02X \r\n", rev[1], rev[0]);

    printf("LockCar Key: %02X%02X%02X%02X \r\n", rev[7], rev[6], rev[5], rev[4]);
        
    printf("Hand Key:");
    for (int i = 0; i < 8; i++) printf("%02X", key[i]);
    printf("\r\n");

}