常见的加密解密算法实现汇总

# HEX

hex加密解密

	#include "stdio.h" //sprintf () 函数声明所在的头文件
	char data[] = "Hello World!!\r\n";
	char res[32];

	int str_2_hex_str(char dest, char src)
	{
	int len = strlen(src); // 获取接收数据长度
	int i,j;
	for (i = 0, j = 0; i < len; i++) {
	sprintf(&dest[j], "%02X", src[i]);
	j+=2; // 每个 16 进制占 2 个长度
	}
	dest[j] = '\0'; // 添加字符串结束符
	return j; // 返回字符串长度
	}

	int len = str_2_hex_str(res, data);
	///////////////////////////////
	#include <stdlib.h> // 要使用 strtol () 库函数，需要包含头文件

	char data[] = "48656C6C6F20576F726C6421210D0A"; // 假如，我们接收到这样的数据
	char res[32]; // 储存转换后的结果

	int hex_str_2_str(char dest, char src)
	{
	int len = strlen(src); // 获取接收数据长度
	int i,j;
	for (i = 0, j = 0; i < len; i+=2) { // 每次取两个字符
	char tmp_buf[3]; // 每两个字符组成一个 16 进制字符串，同时结尾需要空字符来告诉编译器我们的是字符串
	char *endptr; // 保存已转换数值后的下一个字符
	// 以下为取待转换的 16 进制字符串
	tmp_buf[0] = src[i];
	tmp_buf[1] = src[i + 1];
	tmp_buf[2] = '\0'; // 记得添加空字符
	// 转换成 16 进制，base 传 16 即可
	dest[j++] = strtol(tmp_buf, &endptr, 16);
	}
	dest[j] = '\0'; // 添加字符串结束符
	return j;
	}

	int len = hex_str_2_str(res, data);

# BASE64

base64加密解密算法

	//base64 加密
	char base64[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	void encodeBase64(char* str,int len,char** in){

	// 读取 3 个字节 zxc，转换为二进制 01111010 01111000 01100011
	// 转换为 4 个 6 位字节，011110 100111 100001 100011
	// 不足 8 位在前补 0，变成 00011110 00100111 00100001 00100011
	// 若剩余的字节数不足以构成 4 个字节，补等号
	int encodeStrLen = 1 + (len/3)*4 ,k=0;
	encodeStrLen += len%3 ? 4 : 0;
	char* encodeStr = (char)(malloc(sizeof(char)encodeStrLen));
	for(int i=0;i<len;i++){
	if(len - i >= 3){
	encodeStr[k++] = base64[(unsigned char)str[i]>>2];
	encodeStr[k++] = base64[((unsigned char)str[i]&0x03)<<4 \| (unsigned char)str[++i]>>4];
	encodeStr[k++] = base64[((unsigned char)str[i]&0x0f)<<2 \| (unsigned char)str[++i]>>6];
	encodeStr[k++] = base64[(unsigned char)str[i]&0x3f];
	}else if(len-i == 2){
	encodeStr[k++] = base64[(unsigned char)str[i] >> 2];
	encodeStr[k++] = base64[((unsigned char)str[i]&0x03) << 4 \| ((unsigned char)str[++i] >> 4)];
	encodeStr[k++] = base64[((unsigned char)str[i]&0x0f) << 2];
	encodeStr[k++] = '=';
	}else{
	encodeStr[k++] = base64[(unsigned char)str[i] >> 2];
	encodeStr[k++] = base64[((unsigned char)str[i] & 0x03) << 4]; // 末尾补两个等于号
	encodeStr[k++] = '=';
	encodeStr[k++] = '=';
	}
	}
	encodeStr[k] = '\0';
	*in = encodeStr;
	}

	/**
	* 解码既编码的逆过程，先找出编码后的字符在编码之前代表的数字
	* 编码中将 3 位个字符变成 4 个字符，得到这 4 个字符的每个字符代表的原本数字
	* 因为在编码中间每个字符用 base64 码表进行了替换，所以这里要先换回来
	* 在对换回来的数字进行位运算使其还原成 3 个字符
	*/
	void decodeBase64(char* str,int len,char** in){

	char ascill[129];
	int k = 0;
	for(int i=0;i<64;i++){
	ascill[base64[i]] = k++;
	}
	int decodeStrlen = len / 4 * 3 + 1;
	char* decodeStr = (char)malloc(sizeof(char)decodeStrlen);
	k = 0;
	for(int i=0;i<len;i++){
	decodeStr[k++] = (ascill[str[i]] << 2) \| (ascill[str[++i]] >> 4);
	if(str[i+1] == '='){
	break;
	}
	decodeStr[k++] = (ascill[str[i]] << 4) \| (ascill[str[++i]] >> 2);
	if(str[i+1] == '='){
	break;
	}
	decodeStr[k++] = (ascill[str[i]] << 6) \| (ascill[str[++i]]);
	}
	decodeStr[k] = '\0';
	*in = decodeStr;
	}


	int main(){
	char mm[]="UAsFvs3tDyTxFPGb7WbyBYSm05VWrJxgjArj9mx490pfH1LO";
	char *mm1;
	char *mm2;
	encodeBase64(mm,strlen(mm),&mm1);
	decodeBase64(mm1,strlen(mm1),&mm2);
	puts(mm2);
	}

# XXTEA

加密解密算法

	#include <stdint.h>
	#define DELTA 0x9e3779b9
	#define MX (((z>>5^y<<2) + (y>>3^z<<4)) ^ ((sum^y) + (key[(p&3)^e] ^ z)))
	// 容易魔改
	void btea(uint32_t * v, int n, uint32_t const key[4]) {
	//v 为数据，n 为数据长度 (负时为解密)，key 为密钥
	uint32_t y, z, sum; unsigned p, rounds, e;
	if (n > 1)
	/* Coding Part */
	{
	rounds = 6 + 52 / n;
	sum = 0;
	z = v[n - 1];
	do {
	sum += DELTA;
	e = (sum >> 2) & 3;
	for (p = 0; p < n - 1; p++) {
	y = v[p + 1];
	z = v[p] += MX;
	}
	y = v[0];
	z = v[n - 1] += MX;
	} while (-- rounds );
	} else if (n < -1)
	/* Decoding Part */
	{
	n = -n;
	rounds = 6 + 52 / n;
	sum = rounds * DELTA;
	y = v[0];
	do {
	e = (sum >> 2) & 3;
	for (p = n - 1; p > 0; p--) {
	z = v[p - 1];
	y = v[p] -= MX;
	}
	z = v[n - 1];
	y = v[0] -= MX;
	sum -= DELTA;
	} while (-- rounds );
	}
	}

# AES

加密解密

	#define _CRT_SECURE_NO_WARNINGS
	#include<stdio.h>
	void AddRoundKey(unsigned char plaintext, unsigned char CipherKey)/* 轮密钥加 */
	{
	for (int j = 0; j < 16; j++) plaintext[j] = plaintext[j] ^ CipherKey[j];
	}
	void SubBytes(unsigned char plaintext, unsigned char plaintextencrypt, int count)/S 盒置换 /
	{
	unsigned int row, column;
	unsigned char Sbox[16][16] = {
	/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
	/0/{ 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76 },
	/1/{ 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0 },
	/2/{ 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15 },
	/3/{ 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75 },
	/4/{ 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84 },
	/5/{ 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf },
	/6/{ 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8 },
	/7/{ 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2 },
	/8/{ 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73 },
	/9/{ 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb },
	/a/{ 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79 },
	/b/{ 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08 },
	/c/{ 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a },
	/d/{ 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e },
	/e/{ 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf },
	/f/{ 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }
	};// 填充 Sbox 矩阵
	for (int i = 0; i < count; i++)
	{
	row = (plaintext[i] & 0xF0) >> 4;
	column = plaintext[i] & 0x0F;
	plaintextencrypt[i] = Sbox[row][column];
	}
	}
	void SubBytesRe(unsigned char plaintext, unsigned char plaintextencrypt, int count)/S 盒逆置换 /
	{
	unsigned int row, column;
	unsigned char Sbox[16][16] = {
	/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
	{0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},
	{0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},
	{0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},
	{0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},
	{0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},
	{0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},
	{0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},
	{0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},
	{0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},
	{0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},
	{0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},
	{0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},
	{0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},
	{0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},
	{0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},
	{0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d}
	}; // 填充 Sbox 矩阵
	for (int i = 0; i < count; i++)
	{
	row = (plaintext[i] & 0xF0) >> 4;
	column = plaintext[i] & 0x0F;
	plaintextencrypt[i] = Sbox[row][column];
	}
	}
	void ShiftRowsRe(unsigned char plaintextencrypt)/ 行移位的逆 */
	{
	unsigned char temp = 0;
	for (int i = 0; i < 4; i++)// 第 i 行
	{
	for (int j = 0; j < 4 - i; j++)// 第 j 次左移
	{
	temp = plaintextencrypt[i];
	for (int k = 0; k < 4; k++)
	plaintextencrypt[i + 4 * k] = plaintextencrypt[i + 4 * (k + 1)];
	plaintextencrypt[i + 12] = temp;
	}
	}
	}
	void ShiftRows(unsigned char plaintextencrypt)/ 行移位 */
	{
	unsigned char temp = 0;
	for (int i = 0; i < 4; i++)// 第 i 行
	{
	for (int j = 0; j < i; j++)// 第 j 次左移
	{
	temp = plaintextencrypt[i];
	for (int k = 0; k < 4; k++)
	plaintextencrypt[i + 4 * k] = plaintextencrypt[i + 4 * (k + 1)];
	plaintextencrypt[i + 12] = temp;
	}
	}
	}
	unsigned char Mult2(unsigned char num)/* 列混淆 */
	{
	unsigned char temp = num << 1;
	if ((num >> 7) & 0x01)
	temp = temp ^ 27;
	return temp;
	}
	unsigned char Mult3(unsigned char num)
	{
	return Mult2(num) ^ num;
	}
	void MixColumns(unsigned char plaintextencrypt, unsigned char plaintextcrypt)
	{
	int i;
	for (i = 0; i < 4; i++)
	plaintextcrypt[4 * i] = Mult2(plaintextencrypt[4 * i]) ^ Mult3(plaintextencrypt[4 * i + 1]) ^ plaintextencrypt[4 * i + 2] ^ plaintextencrypt[4 * i + 3];
	for (i = 0; i < 4; i++)
	plaintextcrypt[4 * i + 1] = plaintextencrypt[4 * i] ^ Mult2(plaintextencrypt[4 * i + 1]) ^ Mult3(plaintextencrypt[4 * i + 2]) ^ plaintextencrypt[4 * i + 3];
	for (i = 0; i < 4; i++)
	plaintextcrypt[4 * i + 2] = plaintextencrypt[4 * i] ^ plaintextencrypt[4 * i + 1] ^ Mult2(plaintextencrypt[4 * i + 2]) ^ Mult3(plaintextencrypt[4 * i + 3]);
	for (i = 0; i < 4; i++)
	plaintextcrypt[4 * i + 3] = Mult3(plaintextencrypt[4 * i]) ^ plaintextencrypt[4 * i + 1] ^ plaintextencrypt[4 * i + 2] ^ Mult2(plaintextencrypt[4 * i + 3]);
	}
	/* 逆列混淆 */
	#define xtime(x) ((x<<1) ^ (((x>>7) & 1) * 0x1b))
	#define Multiply(x,y) (((y & 1) * x) ^ ((y>>1 & 1) * xtime(x)) ^ ((y>>2 & 1) * xtime(xtime(x))) ^ ((y>>3 & 1) * xtime(xtime(xtime(x)))) ^ ((y>>4 & 1) * xtime(xtime(xtime(xtime(x))))))
	void MixColumnsRe(unsigned char *state)
	{

	unsigned char a, b, c, d;
	for (int i = 0; i < 4; i++)
	{
	a = state[4*i];
	b = state[4*i+1];
	c = state[4*i+2];
	d = state[4*i+3];
	state[4 * i] = Multiply(a, 0x0e) ^ Multiply(b, 0x0b) ^ Multiply(c, 0x0d) ^ Multiply(d, 0x09);
	state[4 * i + 1] = Multiply(a, 0x09) ^ Multiply(b, 0x0e) ^ Multiply(c, 0x0b) ^ Multiply(d, 0x0d);
	state[4 * i + 2] = Multiply(a, 0x0d) ^ Multiply(b, 0x09) ^ Multiply(c, 0x0e) ^ Multiply(d, 0x0b);
	state[4 * i + 3] = Multiply(a, 0x0b) ^ Multiply(b, 0x0d) ^ Multiply(c, 0x09) ^ Multiply(d, 0x0e);
	}
	}
	int CharToWord(unsigned char character, int first)/ 字节转字 */
	{
	return (((int)character[first] & 0x000000ff) << 24) \| (((int)character[first + 1] & 0x000000ff) << 16) \| (((int)character[first + 2] & 0x000000ff) << 8) \| ((int)character[first + 3] & 0x000000ff);
	}
	void WordToChar(unsigned int word, unsigned char character)/ 字转字节 */
	{
	for (int i = 0; i < 4; character[i++] = (word >> (8 * (3 - i))) & 0xFF);
	}
	void ExtendCipherKey(unsigned int CipherKey_word, int round)/ 密钥扩展 */
	{
	unsigned char CipherKeyChar[4] = { 0 },CipherKeyCharEncrypt[4] = { 0 };
	unsigned int Rcon[10] = { 0x01000000,0x02000000,0x04000000,0x08000000,0x10000000,0x20000000,0x40000000,0x80000000,0x1B000000,0x36000000 }; // 轮常量
	for (int i = 4; i < 8; i++)
	{
	if (!(i % 4))
	{
	WordToChar((CipherKey_word[i - 1] >> 24) \| (CipherKey_word[i - 1] << 8), CipherKeyChar);
	SubBytes(CipherKeyChar, CipherKeyCharEncrypt, 4);
	CipherKey_word[i] = CipherKey_word[i - 4] ^ CharToWord(CipherKeyCharEncrypt, 0) ^ Rcon[round];
	}
	else
	CipherKey_word[i] = CipherKey_word[i - 4] ^ CipherKey_word[i - 1];
	}
	}
	void main()
	{
	printf("************AES加解密*************\n");
	int i = 0, k;
	unsigned char PlainText[16] = { 0x32,0x43,0xf6,0xa8,0x88,0x5a,0x30,0x8d,0x31,0x31,0x98,0xa2,0xe0,0x37,0x07,0x34 },
	CipherKey[16] = { 0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c },
	CipherKey1[16] = { 0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c },
	PlainText1[16] = { 0 },
	PlainText2[16] = { 0 };
	unsigned int CipherKey_word[44] = { 0 };
	for (i = 0; i < 4; CipherKey_word[i++] = CharToWord(CipherKey, 4 * i));
	printf("密钥：");
	for (k = 0; k < 16; k++) printf("%2X ", CipherKey[k]);
	printf("\n明文：");
	for (k = 0; k < 16; k++) printf("%02X ", PlainText[k]);
	printf("\n************开始加密**************");
	AddRoundKey(PlainText, CipherKey);
	for (i = 0; i < 9; i++)
	{
	printf("\n第%d轮循环：\n", i + 1);
	SubBytes(PlainText, PlainText1, 16);/S 盒置换 /
	ShiftRows(PlainText1); /* 行移位 */
	MixColumns(PlainText1, PlainText2); /* 列混淆 */
	ExtendCipherKey(CipherKey_word + 4 * i, i);/* 子密钥生成 */
	for (k = 0; k < 4; k++) WordToChar(CipherKey_word[k + 4 * (i + 1)], CipherKey + 4 * k);
	printf("此时的子密钥为： ");
	for (k = 0; k < 16; k++) printf("%02X ", CipherKey[k]);
	AddRoundKey(PlainText2, CipherKey);/* 轮密钥加 */
	for (k = 0; k < 16; k++) PlainText[k] = PlainText2[k];
	printf("\n当前明文加密之后为：");
	for (k = 0; k < 16; k++) printf("%02X ", PlainText2[k]);
	printf("\n");
	}
	printf("\n最后一次循环：\n");
	SubBytes(PlainText, PlainText1, 16);
	ShiftRows(PlainText1);
	ExtendCipherKey(CipherKey_word + 4 * i, i);
	for (k = 0; k < 4;WordToChar(CipherKey_word[k + 4 * (i + 1)], CipherKey + 4 * k), k++);
	printf("此时的子密钥为： ");
	for (k = 0; k < 16; k++) printf("%02X ", CipherKey[k]);
	AddRoundKey(PlainText1, CipherKey);
	printf("\n\n最终AES加密后的密文为：");
	for (i = 0; i < 16; i++) printf("%02X ", PlainText1[i]);
	printf("\n\n************开始解密*************");
	AddRoundKey(PlainText1, CipherKey);
	for (i = 0; i < 9; i++)
	{
	printf("\n第%d次循环：", i + 1);
	SubBytesRe(PlainText1, PlainText, 16);/S 盒置换 /
	for (k = 0; k < 4; WordToChar(CipherKey_word[k + 40 - 4 * (i + 1)], CipherKey + 4 * k),k++);/* 子密钥生成 */
	ShiftRowsRe(PlainText);/* 行移位逆 */
	AddRoundKey(PlainText, CipherKey);/* 轮密钥加 */
	MixColumnsRe(PlainText);/* 列混淆逆运算 */
	for (k = 0; k < 16;PlainText1[k] = PlainText[k],k++);
	printf("\n当前密文解密之后为：");
	for (k = 0; k < 16; k++)printf("%02X ", PlainText[k]);
	printf("\n");
	}
	printf("\n最后一次循环：");
	ShiftRowsRe(PlainText);/* 行移位逆 */
	SubBytesRe(PlainText, PlainText1, 16);/S 盒置换 /
	AddRoundKey(PlainText1, CipherKey1);
	printf("\n最终AES解密后的明文为：");
	for (i = 0; i < 16; i++) printf("%02X ", PlainText1[i]);
	printf("\n");
	system("pause");
	}

# BlowFish

BlowFish伪代码

	// 轮函数
	DWORD Feistel(DWORD x)
	{
	DWORD h = S[0][x >> 24] + S[1][x >> 16 & 0xff];
	return (h ^ S[2][x >> 8 & 0xff]) + S[3][x & 0xff];
	}
	void encrypt(DWORD& XL, DWORD& XR)
	{
	for (int i = 0; i < 16; i += 2)
	{
	XL ^= P[i];
	XR ^= Feistel(XL);
	XR ^= P[i + 1];
	XL ^= Feistel(XR);
	}
	XL ^= P[16];
	XR ^= P[17];
	swap(XL, XR);
	}

	void decrypt(DWORD& XL, DWORD& XR)
	{
	for (int i = 16; i > 0; i -= 2)
	{
	XL ^= P[i + 1];
	XR ^= Feistel(XL);
	XR ^= P[i];
	XL ^= Feistel(XR);
	}
	XL ^= P[1];
	XR ^= P[0];
	swap(XL, XR);
	}

BlowFish加密解密

	from Crypto.Cipher import Blowfish
	import codecs

	class BlowfishCipher:
	def __init__(self):
	pass

	def encrypt(self, plaintext, key):
	key = key.encode("utf-8")
	cipher = Blowfish.new(key, Blowfish.MODE_ECB)

	# 将明文填充到 8 字节的倍数
	plaintext = plaintext.ljust((len(plaintext) + 7) // 8 * 8)

	ciphertext = cipher.encrypt(plaintext.encode('utf-8'))
	hex_encode = codecs.encode(ciphertext, 'hex_codec').decode('utf-8')
	return hex_encode

	def decrypt(self, ciphertext, key):
	key = key.encode("utf-8")
	cipher = Blowfish.new(key, Blowfish.MODE_ECB)

	ciphertext = codecs.decode(ciphertext, 'hex_codec')
	decrypted_text = cipher.decrypt(ciphertext).decode('utf-8').rstrip()
	return decrypted_text

	if __name__ == '__main__':
	plaintext = ''
	key = 'UzBtZTBuZV9EMGcz'

	blowfish_cipher = BlowfishCipher()
	encrypted_text='11a51f049550e2508f17e16cf1632b47'
	decrypted_text = blowfish_cipher.decrypt(encrypted_text, key)
	print(f"加密: {encrypted_text}, 解密: {decrypted_text}")

# SM4

加密解密算法

	#include<stdio.h>
	#define u8 unsigned char
	#define u32 unsigned long

	// S 盒
	const u8 Sbox[256] = {
	0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05,
	0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99,
	0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62,
	0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6,
	0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8,
	0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35,
	0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87,
	0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e,
	0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1,
	0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3,
	0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f,
	0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51,
	0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8,
	0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0,
	0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84,
	0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48
	};

	// 密钥扩展算法的常数 FK
	const u32 FK[4] = {
	0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc
	};

	// 密钥扩展算法的固定参数 CK
	const u32 CK[32] = {
	0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
	0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
	0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
	0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
	0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
	0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
	0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
	0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
	};

	u32 functionB(u32 b); // 查 S 盒的函数 B
	u32 loopLeft(u32 a, short length); // 循环左移函数
	u32 functionL1(u32 a); // 线性变换 L
	u32 functionL2(u32 a); // 线性变换 L'
	u32 functionT(u32 a, short mode); // 合成变换 T
	void extendFirst(u32 MK[], u32 K[]); // 密钥扩展算法第一步
	void extendSecond(u32 RK[], u32 K[]); // 密钥扩展算法第二步
	void getRK(u32 MK[], u32 K[], u32 RK[]); // 轮密钥获取算法
	void iterate32(u32 X[], u32 RK[]); // 迭代算法
	void reverse(u32 X[], u32 Y[]); // 反转函数
	void encryptSM4(u32 X[], u32 RK[], u32 Y[]); // 加密算法
	void decryptSM4(u32 X[], u32 RK[], u32 Y[]); // 解密算法

	/*
	查 S 盒的函数 B
	参数: u32 b
	返回值: 查 S 盒的结果 u32 b
	*/
	u32 functionB(u32 b) {
	u8 a[4];
	short i;
	a[0] = b / 0x1000000;
	a[1] = b / 0x10000;
	a[2] = b / 0x100;
	a[3] = b;
	b = Sbox[a[0]] * 0x1000000 + Sbox[a[1]] * 0x10000 + Sbox[a[2]] * 0x100 + Sbox[a[3]];
	return b;
	}

	/*
	循环左移算法
	参数： u32 a length：循环左移位数
	返回值：u32 b
	*/
	u32 loopLeft(u32 a, short length) {
	short i;
	for(i = 0; i < length; i++) {
	a = a * 2 + a / 0x80000000;
	}
	return a;
	}

	/*
	密钥线性变换函数 L
	参数： u32 a
	返回值：线性变换后的 u32 a
	*/
	u32 functionL1(u32 a) {
	return a ^ loopLeft(a, 2) ^ loopLeft(a, 10) ^ loopLeft(a, 18) ^ loopLeft(a, 24);
	}

	/*
	密钥线性变换函数 L'
	参数： u32 a
	返回值：移位操作后的 u32 a
	*/
	u32 functionL2(u32 a) {
	return a ^ loopLeft(a, 13) ^ loopLeft(a, 23);
	}

	/*
	合成变换 T
	参数： u32 a short mode：1 表示明文的 T，调用 L；2 表示密钥的 T，调用 L'
	返回值：合成变换后的 u32 a
	*/
	u32 functionT(u32 a, short mode) {
	return mode == 1 ? functionL1(functionB(a)) : functionL2(functionB(a));
	}

	/*
	密钥扩展算法第一步
	参数： MK [4]：密钥 K [4]: 中间数据，保存结果（FK [4]：常数）
	返回值：无
	*/
	void extendFirst(u32 MK[], u32 K[]) {
	int i;
	for(i = 0; i < 4; i++) {
	K[i] = MK[i] ^ FK[i];
	}
	}

	/*
	密钥扩展算法第二步
	参数： RK [32]：轮密钥，保存结果 K [4]：中间数据（CK [32]：固定参数）
	返回值：无
	*/
	void extendSecond(u32 RK[], u32 K[]) {
	short i;
	for(i = 0; i <32; i++) {
	K[(i+4)%4] = K[i%4] ^ functionT(K[(i+1)%4] ^ K[(i+2)%4] ^ K[(i+3)%4] ^ CK[i], 2);
	RK[i] = K[(i+4)%4];
	}
	}

	/*
	密钥扩展算法
	参数： MK [4]：密钥 K [4]：中间数据 RK [32]：轮密钥，保存结果
	返回值：无
	*/
	void getRK(u32 MK[], u32 K[], u32 RK[]) {
	extendFirst(MK, K);
	extendSecond(RK, K);
	}

	/*
	迭代 32 次
	参数： u32 X [4]：迭代对象，保存结果 u32 RK [32]：轮密钥
	返回值：无
	*/
	void iterate32(u32 X[], u32 RK[]) {
	short i;
	for(i = 0; i < 32; i++) {
	X[(i+4)%4] = X[i%4] ^ functionT(X[(i+1)%4] ^ X[(i+2)%4] ^ X[(i+3)%4] ^ RK[i], 1);
	}
	}

	/*
	反转函数
	参数； u32 X [4]：反转对象 u32 Y [4]：反转结果
	返回值：无
	*/
	void reverse(u32 X[], u32 Y[]) {
	short i;
	for(i = 0; i < 4; i++){
	Y[i] = X[4 - 1 - i];
	}
	}

	/*
	加密算法
	参数： u32 X [4]：明文 u32 RK [32]：轮密钥 u32 Y [4]：密文，保存结果
	返回值：无
	*/
	void encryptSM4(u32 X[], u32 RK[], u32 Y[]) {
	iterate32(X, RK);
	reverse(X, Y);
	}

	/*
	解密算法
	参数： u32 X [4]：密文 u32 RK [32]：轮密钥 u32 Y [4]：明文，保存结果
	返回值：无
	*/
	void decryptSM4(u32 X[], u32 RK[], u32 Y[]) {
	short i;
	u32 reverseRK[32];
	for(i = 0; i < 32; i++) {
	reverseRK[i] = RK[32-1-i];
	}
	iterate32(X, reverseRK);
	reverse(X, Y);
	}

	/*
	测试数据：
	明文： 01234567 89abcdef fedcba98 76543210
	密钥： 01234567 89abcdef fedcba98 76543210
	密文： 681edf34 d206965e 86b3e94f 536e4246
	*/
	int main(void) {
	u32 X[4]; // 明文
	u32 MK[4]; // 密钥
	u32 RK[32]; // 轮密钥
	u32 K[4]; // 中间数据
	u32 Y[4]; // 密文
	short i; // 临时变量
	printf("明文：");
	scanf("%8x%8x%8x%8x", &X[0], &X[1], &X[2], &X[3]);
	printf("密钥：");
	scanf("%8x%8x%8x%8x", &MK[0], &MK[1], &MK[2], &MK[3]);
	printf("************生成轮密钥***************\n");
	getRK(MK, K, RK);
	for(i = 0; i < 32; i++) {
	printf("[%2d]：%08x ", i, RK[i]);
	if(i%4 == 3) printf("\n");
	}
	printf("************ 生成密文 ***************\n");
	encryptSM4(X, RK, Y);
	printf("%08x %08x %08x %08x\n", Y[0], Y[1], Y[2], Y[3]);
	printf("************ 生成明文 ***************\n");
	decryptSM4(Y, RK, X);
	printf("%08x %08x %08x %08x\n", X[0], X[1], X[2], X[3]);
	return 0;
	}

# DES

DES加密解密算法

	#include<stdio.h>
	#include<string.h>
	#include<stdlib.h>
	#include"table.h"// 存储各种数据表的头文件

	// 十六轮子密钥
	static bool SubKey[16][48] = { 0 };
	/----------------------------- 自定义函数 -----------------------------/
	void SetKey(char My_key[8]); // 生成 16 轮的子密钥
	void ByteToBit(bool * Data_out, char * Data_in, int Num); // 字节转换成位
	void BitToByte(char My_message[8], bool * Message_in, int Num); // 位转换成字节
	void TableReplace(bool Data_out, bool Data_in, const char *Table, int Num); // 各种表的置换算法
	void Bitcopy(bool * Data_out, bool * Data_in, int Num); // 二进制数组的拷贝
	void Loop_bit(bool * Data_out, int movstep, int len); // 左移
	void Run_Des(char My_message[8], char CIPhertext[64]);//des 的轮加密算法
	void Xor(bool * Message_out, bool * Message_in, int Num); // 执行异或
	void S_change(bool * Data_out, bool * Data_in); // S 盒变换
	void Run_desDes(char My_message[8], char CIPhertext[64]);// DES 轮解密算法
	/--------------------------/

	/-------------------------- 主函数 ----------------------------------/
	int main()
	1
	{
	int i = 0, j;
	char My_key[8] = { 0 }; // 记录加密密钥
	char You_key[8] = { 0 }; // 解密密钥
	char My_message[8] = { 0 }; // 明文
	char CIPhertext[64] = { 0 };// 密文
	printf("请输入你要加密的内容(8 Byte):\n");
	scanf("%s", My_message);
	printf("请输入你的加密密钥(8 Byte):\n");
	scanf("%s", My_key);
	i = strlen(My_key);
	while (i != 8)// 确保密钥长度为 8byte
	{
	printf("请输入加密密钥(8 Byte)\n");
	scanf("%s", My_key);
	i = 0;
	i = strlen(My_key);
	}
	SetKey(My_key); // 生成 16 轮的加密子密钥
	Run_Des(My_message, CIPhertext); //des 的轮加密过程
	printf("经过加密的密文为(二进制):\n");
	printf("%s", CIPhertext);
	printf("\n");
	Run_desDes(My_message, CIPhertext);// 解密；
	printf("解密结果为:\n");
	printf("%s", My_message);
	printf("\n");
	return 0;
	}

	/-------------------- 具体函数定义 ----------------------/
	void Bitcopy(bool * Data_out, bool * Data_in, int Num) // 二进制数组拷贝
	{
	int i = 0;
	for (i = 0; i < Num; i++)
	Data_out[i] = Data_in[i];
	}
	void ByteToBit(bool * Data_out, char * Data_in, int Num) // 字节转位，num 为二进制位数
	{
	int i, j;
	for (i = 0; i < Num; i++)
	Data_out[i] = (Data_in[i / 8] >> (i % 8)) & 0x01;
	}
	void BitToByte(char My_message[8], bool * Message_in, int Num) // 位转换成字节，num 为位数
	{
	int i = 0;
	for (i = 0; i < (Num / 8); i++)
	My_message[i] = 0;
	for (i = 0; i < Num; i++)
	My_message[i / 8] \|= Message_in[i] << (i % 8);
	}
	void TableReplace(bool Data_out, bool Data_in, const char *Table, int Num) // 置换算法，Num 表示置换表的长度
	{
	int i = 0;
	static bool Temp[256] = { 0 };
	for (i = 0; i < Num; i++)
	{
	Temp[i] = Data_in[Table[i] - 1];// 将输入数据的指定位置作为输出数据的第 i 位
	}
	Bitcopy(Data_out, Temp, Num);
	}

	void Loop_bit(bool * Data_out, int movstep, int len)// 左循环移位
	{
	static bool Temp[256] = { 0 };
	Bitcopy(Temp, Data_out, movstep);// 将前 movstep 位数据放入 temp 缓存
	Bitcopy(Data_out, Data_out + movstep, len - movstep);// 数据依次向左移位
	Bitcopy(Data_out + len - movstep, Temp, movstep);// 将 temp 中缓存的数据放入最后
	}
	void Xor(bool * Message_out, bool * Message_in, int Num)// 执行异或
	{
	int i;
	for (i = 0; i < Num; i++)
	{
	Message_out[i] = Message_out[i] ^ Message_in[i];
	}
	}
	void SetKey(char My_key[8])//8 字节的初始密钥
	{
	int i, j;
	static bool Key_bit[64] = { 0 }; //Key 的二进制缓存
	static bool Key_bit_L, Key_bit_R;
	Key_bit_L = &Key_bit[0]; //key 的左边 28 位
	Key_bit_R = &Key_bit[28]; //key 的右边 28 位
	ByteToBit(Key_bit, My_key, 64);
	TableReplace(Key_bit, Key_bit, PC1_Table, 56);//pc-1 置换
	for (i = 0; i < 16; i++)// 生成第 i 个子密钥 Subkey [i]
	{
	Loop_bit(Key_bit_L, Move_Table[i], 28);// 左边 28 位进行左循环移位
	Loop_bit(Key_bit_R, Move_Table[i], 28);// 右边 28 位进行左循环移位
	TableReplace(SubKey[i], Key_bit, PC2_Table, 48);//pc-2 置换
	}
	}
	void S_change(bool * Data_out, bool * Data_in) //S 盒变换
	{
	int i;
	int r = 0, c = 0;//S 盒的行和列
	for (i = 0; i < 8; i++, Data_in = Data_in + 6, Data_out = Data_out + 4) // 每 6bit 输入进行一次代换
	{
	r = Data_in[0] * 2 + Data_in[5] * 1;// 将 m1m6 转换为十进制数，作为行数
	c = Data_in[1] * 8 + Data_in[2] * 4 + Data_in[3] * 2 + Data_in[4] * 1;// 将 m2m3m4m5 转换为十进制数，作为列数
	ByteToBit(Data_out, &S_Box[i][r][c], 4);// 取 S 盒数据，将其二进制形式的每一位填到输出的指定位置
	}
	}
	void F_change(bool Data_out[32], bool Data_in[48]) //f 函数
	{
	int i;
	static bool Message_E[48] = { 0 }; // 存放 E 置换的结果
	TableReplace(Message_E, Data_out, E_Table, 48);//E 表置换
	Xor(Message_E, Data_in, 48);// 与密钥 K [i] 异或
	S_change(Data_out, Message_E); // S 盒变换
	TableReplace(Data_out, Data_out, P_Table, 32); //P 置换
	}
	void Run_Des(char My_message[8], char CIPhertext[64])//des 轮加密算法
	{
	int i;
	static bool Message_bit[64] = { 0 };
	static bool Message_bit_L = &Message_bit[0], Message_bit_R = &Message_bit[32];// 分成左右两部分，每部分 32 位
	static bool Temp[32] = { 0 };
	ByteToBit(Message_bit, My_message, 64);
	TableReplace(Message_bit, Message_bit, IP_Table, 64);// 初始置换
	for (i = 0; i < 16; i++)// 每一轮的加密
	{
	Bitcopy(Temp, Message_bit_R, 32);// 缓存右 32 位
	F_change(Message_bit_R, SubKey[i]);// 轮函数 F
	Xor(Message_bit_R, Message_bit_L, 32);// 左 32 位与轮函数 F 输出进行异或
	Bitcopy(Message_bit_L, Temp, 32);// 右 32 位 R (i-1) 作为下一轮的 Li
	}
	TableReplace(Message_bit, Message_bit, IPR_Table, 64);// 逆初始置换
	for (i = 0; i < 64;i++)
	CIPhertext[i] = Message_bit[i]+'0';// 由于是将 bool 型数据赋给字符型数据，因此要 +'0'
	CIPhertext[i] = '\0';
	}
	void Run_desDes(char My_message[8], char CIPhertext[64])// DES 轮解密算法
	{
	int i = 0;
	static bool Message_bit[64] = { 0 };
	static bool * Message_bit_L = &Message_bit[0], *Message_bit_R = &Message_bit[32];
	static bool Temp[32] = { 0 };
	for (i = 0; i < 64; i++)
	Message_bit[i] = CIPhertext[i]-'0';
	TableReplace(Message_bit, Message_bit, IP_Table, 64);
	for (i = 15; i >= 0; i--)// 与加密过程的区别是子密钥使用顺序相反
	{
	Bitcopy(Temp, Message_bit_L, 32);
	F_change(Message_bit_L, SubKey[i]);
	Xor(Message_bit_L, Message_bit_R, 32);
	Bitcopy(Message_bit_R, Temp, 32); }
	TableReplace(Message_bit, Message_bit, IPR_Table, 64);
	BitToByte(My_message, Message_bit, 64);
	}
	}

# BASE58

base58加密解密

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	unsigned char* en_base58(unsigned char* input) // 编码
	{
	static char* nb58 = (char*)"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
	size_t len = strlen((char*)input);
	size_t rlen = (len / 2 + 1) * 3;
	unsigned char* ret = (unsigned char*)malloc(rlen + len);
	unsigned char* src = ret + rlen;
	unsigned char* rptr = ret + rlen;
	unsigned char* ptr, * e = src + len - 1;
	size_t i;
	memcpy(src, input, len);
	while (src <= e)
	{
	if (*src)
	{
	unsigned char rest = 0;
	ptr = src;
	while (ptr <= e)
	{
	unsigned int c = rest * 256;
	rest = (c + *ptr) % 58;
	ptr = (c + ptr) / 58;
	ptr++;
	}
	--rptr;
	*rptr = nb58[rest];
	}
	else
	{
	src++;
	}
	}
	for (i = 0; i < ret + rlen - rptr; i++)
	ret[i] = rptr[i];
	ret[i] = 0;
	return ret;
	}

	bool de_base58(unsigned char* src) // 解码
	{
	static char b58n[] =
	{
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, -1, -1, -1, -1, -1, -1,
	-1, 9, 10, 11, 12, 13, 14, 15, 16, -1, 17, 18, 19, 20, 21, -1,
	22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, -1, -1, -1, -1, -1,
	-1, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, -1, 44, 45, 46,
	47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	};
	size_t len = strlen((char*)src);
	size_t rlen = (len / 4 + 1) * 3;
	unsigned char* ret = (unsigned char*)malloc(rlen);
	unsigned char* rptr = ret + rlen;
	size_t i;
	unsigned char* ptr;
	for (i = 0; i < len; i++)
	{
	char rest = b58n[src[i]];
	if (rest < 0)
	{
	free(ret);
	return NULL;
	}
	for (ptr = ret + rlen - 1; ptr >= rptr; ptr--)
	{
	unsigned int c = rest + ptr 58;
	*ptr = c % 256;
	rest = c / 256;
	}
	if (rest > 0)
	{
	rptr--;
	if (rptr < ret)
	{
	free(ret);
	return NULL;
	}
	*rptr = rest;
	}
	}
	for (i = 0; i < ret + rlen - rptr; i++)
	ret[i] = rptr[i];
	ret[i] = 0;
	memcpy(src, ret, strlen((char*)src));
	}

	int main()
	{
	char str[] = "9EGJCxbxRGT";
	printf("%s\n", en_base58((unsigned char*)"12345678"));
	de_base58((unsigned char*)str);
	printf("%s", str);
	getchar();
	return 0;
	}

# SHA1

sha1加密解密实现

	#include<stdio.h>
	#include<stdlib.h>
	#include<string.h>
	#define rol(x,y) ((x<<y)\|(x>>(32-y))) // 循环左移

	// 一次循环过程，str 为填充后的数据或是数据中的一部分
	void round(unsigned char str[64],unsigned int h[5]){
	unsigned int a, b, c, d, e,tmp,w[80];
	unsigned int i;
	for(i=0;i<16;i++){
	w[i]=((unsigned int)str[i4]<<24)\|(((unsigned int)str[i4+1])<<16)\|
	(((unsigned int)str[i4+2])<<8)\|(((unsigned int)str[i4+3])<<0);
	}
	for (i=16;i<80;i++ ){
	tmp = w[i-3]^w[i-8]^w[i-14]^w[i-16];
	w[i]=rol(tmp,1);
	}

	a=h[0];b=h[1];c=h[2];d=h[3];e=h[4];
	for(i=0;i<80;i++){
	switch(i/20){
	case 0:tmp=rol(a,5)+((b&c)\|(d&~b))+e+w[i]+0x5a827999;break;
	case 1:tmp=rol(a,5)+(b^c^d)+e+w[i]+0x6ed9eba1;break;
	case 2:tmp=rol(a,5)+((b&c)\|(b&d)\|(c&d))+e+w[i] +0x8f1bbcdc;break;
	case 3:tmp=rol(a,5)+(b^c^d)+e+w[i] + 0xca62c1d6;break;
	}
	e=d;d=c;
	c=rol(b,30);
	b=a;a=tmp;
	}
	h[0]+=a;h[1]+=b;h[2]+=c;h[3]+=d;h[4]+=e;
	}

	//sha-1 算法
	void sha1(unsigned charinput,long long len,unsigned charoutput){
	unsigned char temp[64];
	unsigned int h[5]={0x67452301,0xefcdab89,0x98badcfe,0x10325476,0xc3d2e1f0};
	unsigned int i,n=len,tmp;
	while(n>=64){
	memcpy(temp,input+len-n,64);
	round(temp,h);
	n-=64;
	}

	if(n>=56){
	memset(temp,0,64);
	memcpy(temp,input+len-n,n);temp[n]=128;
	round(temp,h);
	memset(temp,0,64);
	for(i=56;i<64;i++)
	temp[i]=((len8)>>(63-i)8)&0xff;
	round(temp,h);
	}
	else{
	memset(temp,0,64);
	memcpy(temp,input+len-n,n);temp[n]=128;
	for(i=56;i<64;i++)
	temp[i]=((len8)>>(63-i)8)&0xff;
	round(temp,h);
	}

	for(i=0;i<20;i++){
	tmp=(h[i/4]>>((3-i%4)*8))&0xff;
	sprintf((char)output+2i,"%02x",tmp);
	}
	}

	// 测试
	int main(){
	unsigned char input[]="this is a test aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",output[40]={0};
	sha1(input,strlen((char*)input),output);
	printf("%s\n",output);
	}

# RC4

rc4加密解密

	#include<stdio.h>
	#include<stdlib.h>
	#include<string.h>

	//s 表的长度取 256
	#define size 256

	unsigned char sbox[257]={0};

	// 初始化 s 表
	void init_sbox(unsigned char*key){
	unsigned int i,j,k;
	int tmp;

	for(i=0;i<size;i++){
	sbox[i]=i;
	}

	j=k=0;
	for(i=0;i<size;i++){
	tmp=sbox[i];
	j=(j+tmp+key[k])%size;
	sbox[i]=sbox[j];
	sbox[j]=tmp;
	if(++k>=strlen((char*)key))k=0;
	}
	}

	// 加解密函数
	void enc_dec(unsigned charkey,unsigned chardata){
	int i,j,k,R,tmp;

	init_sbox(key);

	j=k=0;
	for(i=0;i<strlen((char*)data);i++){
	j=(j+1)%size;
	k=(k+sbox[j])%size;

	tmp=sbox[j];
	sbox[j]=sbox[k];
	sbox[k]=tmp;

	R=sbox[(sbox[j]+sbox[k])%size];

	data[i]^=R;
	}
	}

	int main(){
	unsigned char key[100]={0};
	unsigned char data[100]={0};
	printf("输入你要加密的字符：");
	scanf("%100s",data);
	printf("输入密钥：");
	scanf("%40s",key);
	enc_dec(key,data);
	printf("enc: %s\n",data);
	enc_dec(key,data);
	printf("dec: %s\n",data);
	return 0;
	}

汇编 Re

# HEX

# BASE64

# XXTEA

# AES

# BlowFish

# SM4

# DES

# BASE58

# SHA1

# RC4

你用了8年的软件居然是盗版

常见加密算法特征识别