基于单片机的DES加密解密算法C源码

基于单片机的DES加密解密算法C源码

 

 

有一STM32项目需要用到DES算法，从网上找了很多资料什么的，看的似是而非的，只好找以前一个ASCOM的基于8位机，16位机的IC卡电话机的DES源码移植过来使用，测试通过后公布，方便大家借鉴使用。

//以下是des.c文件全部： 
//密钥： B4 31 5B 86 9D 7D FA A2 
//数据： 1F AD 61 A5 F7 19 77 14 
//DES加密结果：4C 78 E9 1A F2 DA 9C D3

源码：

一个高手的代码： 
https://blog.csdn.net/SuGuolin/article/details/77887590 
如下：

 #include <string.h> #include <stdint.h> // for uint8_t /************************************************************************/ /* */ /* Module title: des */ /* Module type: des mainrutine */ /* */ /* Author: YXH */ /* Date: 2012-07-13 */ /* */ /* Last changed by: YXH */ /* Date: 2012-07-13 */ /* */ /* Functional Deｓｃｒｉｐｔion: Encjipher and decipher 64 bits string */ /* according to a 64 bits key string */ /* The string format is shown below */ /* */ /* input parameter 1: pointer to 64 bits input string */ /* 2: pointer to 64 bits key string */ /* 3: boolean if false indicating enciphering */ /* if true dechiphering */ /* 4: pointer to a 64 bits output string */ /************************************************************************/ /* */ /* msb lsb */ /* bit bit */ /* +-- -- -- -- -- -- -- --+ */ /* addr !1st 8th! */ /* +-- -- -- -- -- -- -- --+ */ /* addr+1 !9th 16th! */ /* +-- -- -- -- -- -- -- --+ */ /* : : */ /* : : */ /* +-- -- -- -- -- -- -- --+ */ /* addr+7 !57th 64th! */ /* +-- -- -- -- -- -- -- --+ */ /* */ /************************************************************************/ void f(uint8_t *skey, uint8_t *a_str, uint8_t *x_str); void compute_subkeys(uint8_t *key); void transpose(uint8_t *idata, uint8_t *odata, const uint8_t *tbl, uint8_t n); void transpose_debug(uint8_t *idata, uint8_t *odata, const uint8_t *tbl, uint8_t n); void printBuf(unsigned char *s, unsigned char *buf, int cnt, int num) { int i; printf("%12s ", s); for (i = 0; i < cnt; i++) { printf("%02x ", *(buf + i)); if ((i + 1) % num == 0){ printf("rn"); } } printf("rn"); } const uint8_t initial_tr[64] = { 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7, 56, 48, 40, 32, 24, 16, 8, 0, 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6 }; const uint8_t final_tr[64] = { 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25, 32, 0, 40, 8, 48, 16, 56, 24 }; const uint8_t swap[64] = { 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 }; const uint8_t key_tr1[56] = { 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 }; const uint8_t key_tr2[64] = { 0, 0, 13, 4, 16, 10, 23, 0, 0, 0, 2, 9, 27, 14, 5, 20, 0, 0, 22, 7, 18, 11, 3, 25, 0, 0, 15, 1, 6, 26, 19, 12, 0, 0, 40, 54, 51, 30, 36, 46, 0, 0, 29, 47, 39, 50, 44, 32, 0, 0, 43, 52, 48, 38, 55, 33, 0, 0, 45, 31, 41, 49, 35, 28 }; const uint8_t etr[64] = { 0, 0, 31, 4, 0, 1, 2, 3, 0, 0, 3, 8, 4, 5, 6, 7, 0, 0, 7, 12, 8, 9, 10, 11, 0, 0, 11, 16, 12, 13, 14, 15, 0, 0, 15, 20, 16, 17, 18, 19, 0, 0, 19, 24, 20, 21, 22, 23, 0, 0, 23, 28, 24, 25, 26, 27, 0, 0, 27, 0, 28, 29, 30, 31 }; const uint8_t ptr[32] = { 31, 14, 39, 44, 60, 23, 55, 36, 4, 30, 46, 53, 12, 37, 62, 21, 5, 15, 47, 29, 63, 54, 6, 20, 38, 28, 61, 13, 45, 22, 7, 52 }; const uint8_t s[8][64] = { { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 }, { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 }, { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 }, { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 }, { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 }, { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 }, { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 }, { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 } }; const char rots[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; const char bit_msk[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }; uint8_t DES_Encrypt_key[8]; uint8_t DES_Decrypt_key[8]; uint8_t sub_keys[16][8]; //sub_keys[16][8] uint8_t main_key[8]; void des(uint8_t *plain_strng, uint8_t *key, uint8_t d, uint8_t *ciph_strng) { uint8_t a_str[8], b_str[8], x_str[8]; uint8_t i, j, *pkey, temp; for (i = 0; i < 8; ++i) { if (key[i] != main_key[i]) { compute_subkeys(key); i = 7; } } transpose(plain_strng, a_str, initial_tr, 64); for (i = 1; i < 17; ++i) { for (j = 0; j < 8; ++j) { b_str[j] = a_str[j]; } if (!d) /*enchipher*/ pkey = &sub_keys[i - 1][0]; else /*dechipher*/ pkey = &sub_keys[16 - i][0]; for (j = 0; j < 4; ++j) { a_str[j] = b_str[j + 4]; } f(pkey, a_str, x_str); for (j = 0; j < 4; ++j) { a_str[j + 4] = b_str[j] ^ x_str[j]; } } temp = a_str[0]; a_str[0] = a_str[4]; a_str[4] = temp; temp = a_str[1]; a_str[1] = a_str[5]; a_str[5] = temp; temp = a_str[2]; a_str[2] = a_str[6]; a_str[6] = temp; temp = a_str[3]; a_str[3] = a_str[7]; a_str[7] = temp; transpose(a_str, ciph_strng, final_tr, 64); } void des_debug(uint8_t *plain_strng, uint8_t *key, uint8_t d, uint8_t *ciph_strng) { uint8_t a_str[8], b_str[8], x_str[8]; uint8_t i, j, *pkey, temp; for (i = 0; i < 8; ++i) { if (key[i] != main_key[i]) { compute_subkeys(key); i = 7; } } printf("Hello:rn"); transpose_debug(plain_strng, a_str, initial_tr, 64); printBuf("a_str:", a_str, 8, 32); for (i = 1; i < 17; ++i) { for (j = 0; j < 8; ++j) { b_str[j] = a_str[j]; } if (!d) /*enchipher*/ pkey = &sub_keys[i - 1][0]; else /*dechipher*/ pkey = &sub_keys[16 - i][0]; for (j = 0; j < 4; ++j) { a_str[j] = b_str[j + 4]; } f(pkey, a_str, x_str); for (j = 0; j < 4; ++j) { a_str[j + 4] = b_str[j] ^ x_str[j]; } } temp = a_str[0]; a_str[0] = a_str[4]; a_str[4] = temp; temp = a_str[1]; a_str[1] = a_str[5]; a_str[5] = temp; temp = a_str[2]; a_str[2] = a_str[6]; a_str[6] = temp; temp = a_str[3]; a_str[3] = a_str[7]; a_str[7] = temp; transpose(a_str, ciph_strng, final_tr, 64); } /************************************************************************/ /* */ /* Module title: transpose */ /* Module type: des subrutine */ /* */ /* Author: YXH */ /* Date: 2012-07-13 */ /* */ /* Last changed by: YXH */ /* Date: 2012-07-13 */ /* */ /* Functional Deｓｃｒｉｐｔion: Permute n bits in a string, according */ /* to a table describing the new order. */ /* 0 < n <= 64 */ /* */ /* input parameter 1: pointer to first byte in input string */ /* 2: pointer to first byte in output string */ /* 3: pointer to table describing new order */ /* 4: number of bits to be permuted */ /************************************************************************/ void transpose(uint8_t *idata, uint8_t *odata, const uint8_t *tbl, uint8_t n) { const uint8_t *tab_adr; int i, bi_idx; tab_adr = (uint8_t *)&bit_msk[0]; i = 0; do { odata[i++] = 0; } while (i < 8); i = 0; do { bi_idx = *tbl++; if (idata[bi_idx >> 3] & tab_adr[bi_idx & 7]) { odata[i >> 3] |= tab_adr[i & 7]; } } while (++i < n); } void transpose_debug(uint8_t *idata, uint8_t *odata, const uint8_t *tbl, uint8_t n) { const uint8_t *tab_adr; int i, bi_idx; tab_adr = (uint8_t *)&bit_msk[0]; i = 0; do { odata[i++] = 0; } while (i < 8); i = 0; do { bi_idx = *tbl++; if (idata[bi_idx >> 3] & tab_adr[bi_idx & 7]) { odata[i >> 3] |= tab_adr[i & 7]; printf("1--%d,%d,%xrn", bi_idx, bi_idx & 7, (unsigned char)idata[bi_idx >> 3]); } else{ printf("0--%d,%d,%xrn", bi_idx, bi_idx & 7, (unsigned char)idata[bi_idx >> 3]); } if ((i + 1) % 16 == 0){ printf("rn"); } } while (++i < n); } /************************************************************************/ /* */ /* Module title: rotate_l */ /* Module type: des subrutine */ /* */ /* Author: YXH */ /* Date: 2012-07-13 */ /* */ /* Last changed by: YXH */ /* Date: 2012-07-13 */ /* */ /* Functional Deｓｃｒｉｐｔion: rotate 2 concatenated strings of 28 */ /* bits one position to the left. */ /* */ /* input parameter 1: pointer to first byte in key string */ /* */ /************************************************************************/ void rotate_l(uint8_t *key) { uint8_t str_x[8]; uint8_t i; for (i = 0; i < 8; ++i) str_x[i] = key[i]; for (i = 0; i < 7; ++i) { key[i] = (key[i] << 1); if ((i < 6) && ((str_x[i + 1] & 128) == 128)) key[i] |= 1; } if (str_x[0] & 0x80) key[3] |= 0x10; else key[3] &= ~0x10; if (str_x[3] & 0x08) key[6] |= 0x01; else key[6] &= ~0x01; } /************************************************************************/ /* */ /* Module title: compute_subkeys */ /* Module type: des subrutine */ /* */ /* Author: YXH */ /* Date: 2012-07-13 */ /* */ /* Last changed by: YXH */ /* Date: 2012-07-13 */ /* */ /* Functional Deｓｃｒｉｐｔion: Computes the 16 sub keys for use in the */ /* DES algorithm */ /* */ /* input parameter 1: pointer to first byte in key string */ /* output : fills the array sub_keys[16][8] with */ /* sub keys and stores the input key in */ /* main_key[8] */ /************************************************************************/ void compute_subkeys(uint8_t *key) //计算子匙 { uint8_t i, j, ikey[8], okey[8]; for (i = 0; i < 8; ++i) { main_key[i] = key[i]; } transpose(key, ikey, key_tr1, 56); for (i = 0; i < 16; ++i) { for (j = 0; j < rots[i]; ++j) { rotate_l(ikey); } transpose(ikey, okey, key_tr2, 64); for (j = 0; j < 8; ++j) { sub_keys[i][j] = okey[j]; } } } /************************************************************************/ /* */ /* Module title: DES3 */ /* Module type: 3des */ /* */ /* Author: HRX */ /* Date: 2017-01-12 */ /* */ /* Last changed by: HRX */ /* Date: 2017-01-12 */ /* */ /* Functional Deｓｃｒｉｐｔion: The chipher function */ /* */ /* input parameter 1: 加密(解密)的数据 */ /* 2: 加密(解密)的数据长度 */ /* 3: 16字节密钥 */ /* 4: 模式(0:加密 1:解密) */ /* 5: 加密(解密)后的数? */ /************************************************************************/ void DES3(char *input, uint8_t inputlen, char* key, uint8_t mode, char * ouput) { uint8_t number, i; char out[8], among[8], among1[8], in[8], key1[8], key2[8]; number = inputlen / 8; if (inputlen % 8 != 0) number++; memcpy(key1, key, 8); memcpy(key2, &key[8], 8); for (i = 0; i<number; i++) { //每8字节做一次3DES memcpy(in, &input[i * 8], 8); if (mode == 0) //加密模式 { des((uint8_t *)&in, (uint8_t *)key1, 0, (uint8_t *)among); //密钥1 DES加密 des((uint8_t *)&among, (uint8_t *)key2, 1, (uint8_t *)among1); //密钥2 解密 des((uint8_t *)&among1, (uint8_t *)key1, 0, (uint8_t *)out); //密钥1 DES加密 } else if (mode == 1) //解密模式 { des((uint8_t *)&in, (uint8_t *)key1, 1, (uint8_t *)among); //密钥1 DES解密 des((uint8_t *)&among, (uint8_t *)key2, 0, (uint8_t *)among1); //密钥2 DES加密 des((uint8_t *)&among1, (uint8_t *)key1, 1, (uint8_t *)out); //密钥1 DES解密 } memcpy(&ouput[i * 8], out, 8); } } /************************************************************************/ /* */ /* Module title: f */ /* Module type: des subrutine */ /* */ /* Author: YXH */ /* Date: 2012-07-13 */ /* */ /* Last changed by: YXH */ /* Date: 2012-07-13 */ /* */ /* Functional Deｓｃｒｉｐｔion: The chipher function */ /* */ /* input parameter 1: pointer to first byte in key string */ /* 2: pointer to a 32 bit input string */ /* 3: pointer to a 32 bit output string */ /************************************************************************/ void f(uint8_t *skey, uint8_t *a_str, uint8_t *x_str) { uint8_t e_str[8], y_str[8], z_str[8]; uint8_t k; transpose(a_str, e_str, etr, 64); for (k = 0; k < 8; ++k) { y_str[k] = (e_str[k] ^ skey[k]) & 63; z_str[k] = s[k][y_str[k]]; } transpose(z_str, x_str, ptr, 32); } void Test_DES3(void) { uint8_t KEY[16] = { 0x58, 0x24, 0x4B, 0x65, 0x98, 0x1A, 0x2E, 0x85, 0x60, 0x77, 0x39, 0x65, 0x88, 0x73, 0x4F, 0x38 }; uint8_t input[16] = { 0x11, 0x09, 0x06, 0x09, 0x24, 0x35, 0x00, 0x01, 0x70, 0x71, 0x90, 0x14, 0x99, 0x00, 0x00, 0x00 }; // uint8_t input[8]={0x41,0x42,0x43,0x44,0x45,0x30,0x30,0x30}; uint8_t output[16] = { 0 }; uint8_t output2[16] = { 0 }; int i; printf("rninput:rn"); for (i = 0; i < sizeof(input); i++) { printf("%02x", *(input + i)); } printf("n"); // des((uint8_t *)&input,(uint8_t *)KEY,0,(uint8_t *)output); // for (i = 0; i < sizeof(output); i++) // { // printf("%02X", *(output + i)); // } // printf("n"); // des((uint8_t *)&output,(uint8_t *)KEY,1,(uint8_t *)output2); // for (i = 0; i < sizeof(output2); i++) // { // printf("%02x", *(output2 + i)); // } // printf("n"); DES3((char *)&input, sizeof(input), (char *)KEY, 0, (char *)output); printf("des3 encry output :rn"); for (i = 0; i < sizeof(output); i++) { printf("%02X", *(output + i)); } printf("n"); DES3((char *)&output, 16, (char *)KEY, 1, (char *)output2); printf("des3 decrypt output :rn"); for (i = 0; i < sizeof(output2); i++) { printf("%02x", *(output2 + i)); } printf("n"); } void Test_Des_A(void) { unsigned char key[8] = { 0xB4, 0x31, 0x5B, 0x86, 0x9D, 0x7D, 0xFA, 0xA2 }; unsigned char data[8] = { 0x1F,0xAD ,0x61 ,0xA5 ,0xF7 ,0x19 ,0x77 ,0x14 }; unsigned char EncryptData[8] = { 0 }; des((uint8_t *)&data, (uint8_t *)key, 0, (uint8_t *)EncryptData); printf("rnDes:rn"); printBuf("key:", key, 8, 32); printBuf("plain:", data, 8, 32); printBuf("EncryptData:", EncryptData, 8, 32); } void Test_Des_B(void) { unsigned char key[8] = { 0x13,0x34,0x57,0x79,0x9B,0xBC,0xDF,0xF1}; unsigned char data[8] = { 0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF }; unsigned char EncryptData[8] = { 0 }; des_debug((uint8_t *)&data, (uint8_t *)key, 0, (uint8_t *)EncryptData); printf("rnDes:rn"); printBuf("key:", key, 8, 32); printBuf("plain:", data, 8, 32); printBuf("EncryptData:", EncryptData, 8, 32); } void main(void) { printf("Start:rn"); Test_Des_B(); Test_Des_A(); Test_DES3(); } 

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将代码用 vs2013 建立一个空的控制台程序：  运行结果如下：

 Start: Hello: 1--57,1,ef 1--49,1,cd 0--41,1,ab 0--33,1,89 1--25,1,67 1--17,1,45 0--9,1,23 0--1,1,1 0--59,3,ef 0--51,3,cd 0--43,3,ab 0--35,3,89 0--27,3,67 0--19,3,45 0--11,3,23 0--3,3,1 1--61,5,ef 1--53,5,cd 0--45,5,ab 0--37,5,89 1--29,5,67 1--21,5,45 0--13,5,23 0--5,5,1 1--63,7,ef 1--55,7,cd 1--47,7,ab 1--39,7,89 1--31,7,67 1--23,7,45 1--15,7,23 1--7,7,1 1--56,0,ef 1--48,0,cd 1--40,0,ab 1--32,0,89 0--24,0,67 0--16,0,45 0--8,0,23 0--0,0,1 1--58,2,ef 0--50,2,cd 1--42,2,ab 0--34,2,89 1--26,2,67 0--18,2,45 1--10,2,23 0--2,2,1 1--60,4,ef 1--52,4,cd 1--44,4,ab 1--36,4,89 0--28,4,67 0--20,4,45 0--12,4,23 0--4,4,1 1--62,6,ef 0--54,6,cd 1--46,6,ab 0--38,6,89 1--30,6,67 0--22,6,45 1--14,6,23 0--6,6,1 a_str: cc 00 cc ff f0 aa f0 aa Des: key: 13 34 57 79 9b bc df f1 plain: 01 23 45 67 89 ab cd ef EncryptData: 85 e8 13 54 0f 0a b4 05 Des: key: b4 31 5b 86 9d 7d fa a2 plain: 1f ad 61 a5 f7 19 77 14 EncryptData: 4c 78 e9 1a f2 da 9c d3 input: 11090609243500017071901499000000 des3 encry output : 4C6EA249A24860D5BC9341022F429BD1 des3 decrypt output : 11090609243500017071901499000000 请按任意键继续. . . 

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解析：

 1--48,0,b3 0--49,1,b3 1--50,2,b3 1--51,3,b3 0--52,4,b3 0--53,5,b3 1--54,6,b3 1--55,7,b3

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从上面可以看出，  这个算法，在对输入的字节进行解析的时候，  0xb3 ： bit0—-bit7 ：10110011  这个直接就是按照，b3 的字面意思解析的，  不是按照一个字节在内存中的实际存储形式，  比如小端模式，低字节在前，低比特位在前的模式解析的

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