逆向常用算法

发表于 2023-01-14 本文字数 32k 字阅读时长 29 分钟

对常用的逆向算法进行了整理

# RC4

	def RC4(data, key):
	if type(data) == type('oacia'): # 判断是否为字符串
	data = [ord(i) for i in data]
	if type(key) == type('oacia'):
	key = [ord(i) for i in key]

	S = list(range(256))
	j = 0
	out = []

	# KSA Phase
	for i in range(256):
	j = (j + S[i] + key[i % len(key)]) % 256
	S[i], S[j] = S[j], S[i]

	# PRGA Phase
	i = j = 0
	for ch in data:
	i = (i + 1) % 256
	j = (j + S[i]) % 256
	S[i], S[j] = S[j], S[i]
	out.append(ch ^ S[(S[i] + S[j]) % 256])

	return out


	def RC4encrypt(plaintext, key):
	return RC4(plaintext, key)


	def RC4decrypt(ciphertext, key):
	return RC4(ciphertext, key)


	# Example usage
	plaintext = "this is RC4,oacia"
	key = "secret"
	# 对明文进行加密
	ciphertext = RC4encrypt(plaintext, key)
	print(f"ciphertext:{ciphertext}")

	# 对密文进行解密
	decrypted = RC4decrypt(ciphertext, key)
	print(f"decrypted:{decrypted}")
	'''
	ciphertext:[153, 94, 187, 111, 162, 205, 165, 134, 96, 136, 143, 240, 156, 135, 150, 94, 204]
	decrypted:[116, 104, 105, 115, 32, 105, 115, 32, 82, 67, 52, 44, 111, 97, 99, 105, 97]
	'''

	#include<stdio.h>

	/*
	RC4 初始化函数
	*/
	void rc4_init(unsigned char* s, unsigned char* key, unsigned long Len_k)
	{
	int i = 0, j = 0;
	char k[256] = { 0 };
	unsigned char tmp = 0;
	for (i = 0; i < 256; i++) {
	s[i] = i;
	k[i] = key[i % Len_k];
	}
	for (i = 0; i < 256; i++) {
	j = (j + s[i] + k[i]) % 256;
	tmp = s[i];
	s[i] = s[j];
	s[j] = tmp;
	}
	}

	/*
	RC4 加解密函数
	unsigned char* Data 加解密的数据
	unsigned long Len_D 加解密数据的长度
	unsigned char* key 密钥
	unsigned long Len_k 密钥长度
	*/
	void RC4(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k) // 加解密
	{
	unsigned char s[256];
	rc4_init(s, key, Len_k);
	int i = 0, j = 0, t = 0;
	unsigned long k = 0;
	unsigned char tmp;
	for (k = 0; k < Len_D; k++) {
	i = (i + 1) % 256;
	j = (j + s[i]) % 256;
	tmp = s[i];
	s[i] = s[j];
	s[j] = tmp;
	t = (s[i] + s[j]) % 256;
	Data[k] = Data[k] ^ s[t];
	}
	}

	void RC4encrypt(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k) {
	RC4(Data, Len_D, key, Len_k);
	}
	void RC4decrypt(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k) {
	RC4(Data, Len_D, key, Len_k);
	}
	int main()
	{
	// 字符串密钥
	unsigned char key[] = "secret";
	unsigned long key_len = sizeof(key) - 1;// 字符串最后还有一个 '/0' 所以需要 - 1
	// 数组密钥
	//unsigned char key[] = {'s','e','c','r','e','t'};
	//unsigned long key_len = sizeof(key);

	unsigned char data[] = { 116, 104, 105, 115, 32, 105, 115, 32, 82, 67, 52, 44, 111, 97, 99, 105, 97 };

	// 对明文进行加密
	RC4encrypt(data, sizeof(data), key, key_len);

	for (int i = 0; i < sizeof(data); i++)
	{
	printf("%d, ", data[i]);
	}
	printf("\n");

	// 对密文进行解密
	RC4encrypt(data, sizeof(data), key, key_len);

	for (int i = 0; i < sizeof(data); i++)
	{
	printf("%c", data[i]);
	}
	printf("\n");
	return 0;
	}
	/*
	153, 94, 187, 111, 162, 205, 165, 134, 96, 136, 143, 240, 156, 135, 150, 94, 204,
	this is RC4,oacia
	*/

# TEA

	from ctypes import *


	def encrypt(v, k):
	v0, v1 = c_uint32(v[0]), c_uint32(v[1])
	delta = 0x9e3779b9
	k0, k1, k2, k3 = k[0], k[1], k[2], k[3]

	total = c_uint32(0)
	for i in range(32):
	total.value += delta
	v0.value += ((v1.value << 4) + k0) ^ (v1.value + total.value) ^ ((v1.value >> 5) + k1)
	v1.value += ((v0.value << 4) + k2) ^ (v0.value + total.value) ^ ((v0.value >> 5) + k3)

	return v0.value, v1.value


	def decrypt(v, k):
	v0, v1 = c_uint32(v[0]), c_uint32(v[1])
	delta = 0x9e3779b9
	k0, k1, k2, k3 = k[0], k[1], k[2], k[3]

	total = c_uint32(delta * 32)
	for i in range(32):
	v1.value -= ((v0.value << 4) + k2) ^ (v0.value + total.value) ^ ((v0.value >> 5) + k3)
	v0.value -= ((v1.value << 4) + k0) ^ (v1.value + total.value) ^ ((v1.value >> 5) + k1)
	total.value -= delta

	return v0.value, v1.value


	# 待加密的明文，两个 32 位整型，即 64bit 的明文数据
	value = [0x6869216f, 0x61636961]
	# 四个 key，每个是 32bit，即密钥长度为 128bit
	key = [0x1, 0x2, 0x3, 0x4]

	print("Data is : ", hex(value[0]), hex(value[1]))
	res = encrypt(value, key)
	print("Encrypted data is : ", hex(res[0]), hex(res[1]))
	res = decrypt(res, key)
	print("Decrypted data is : ", hex(res[0]), hex(res[1]))
	"""
	Data is : 0x6869216f 0x61636961
	Encrypted data is : 0x55d9ac0b 0x2df0479f
	Decrypted data is : 0x6869216f 0x61636961
	"""

	#include <stdio.h>
	#include <stdint.h>

	// 加密函数
	void encrypt(uint32_t* v, uint32_t* k) {
	uint32_t delta = 0x9e3779b9;
	uint32_t v0 = v[0], v1 = v[1], sum = 0, i;
	uint32_t k0 = k[0], k1 = k[1], k2 = k[2], k3 = k[3];
	for (i = 0; i < 32; i++) {
	sum += delta;
	v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
	v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
	}
	v[0] = v0; v[1] = v1;
	}

	// 解密函数
	void decrypt(uint32_t* v, uint32_t* k) {
	uint32_t delta = 0x9e3779b9;
	uint32_t v0 = v[0], v1 = v[1], sum = 32*delta, i;

	uint32_t k0 = k[0], k1 = k[1], k2 = k[2], k3 = k[3];
	for (i = 0; i<32; i++) {
	v1 -= ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
	v0 -= ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
	sum -= delta;
	}
	v[0] = v0; v[1] = v1;
	}

	int main()
	{
	//v 为要加解密的数据，两个 32 位无符号整数
	uint32_t v[2] = { 0x6869216f, 0x61636961 };
	//k 为加解密密钥，4 个 32 位无符号整数，密钥长度为 128 位
	uint32_t k[4] = { 0x1, 0x2, 0x3, 0x4 };
	int n = sizeof(v) / sizeof(uint32_t);
	printf("Data is : 0x%x 0x%x\n", v[0], v[1]);
	encrypt(v, k);
	printf("Encrypted data is : 0x%x 0x%x\n", v[0], v[1]);
	decrypt(v, k);
	printf("Decrypted data is : 0x%x 0x%x\n", v[0], v[1]);
	return 0;
	}
	/*
	Data is : 0x6869216f 0x61636961
	Encrypted data is : 0x55d9ac0b 0x2df0479f
	Decrypted data is : 0x6869216f 0x61636961
	*/

	from ctypes import *


	def encrypt(v, key):
	v0, v1 = c_uint32(v[0]), c_uint32(v[1])
	delta = 0x9E3779B9

	total = c_uint32(0)
	for i in range(32):
	v0.value += (((v1.value << 4) ^ (v1.value >> 5)) + v1.value) ^ (total.value + key[total.value & 3])
	total.value += delta
	v1.value += (((v0.value << 4) ^ (v0.value >> 5)) + v0.value) ^ (total.value + key[(total.value >> 11) & 3])

	return v0.value, v1.value


	def decrypt(v, key):
	v0, v1 = c_uint32(v[0]), c_uint32(v[1])
	delta = 0x9E3779B9

	total = c_uint32(delta * 32)
	for i in range(32):
	v1.value -= (((v0.value << 4) ^ (v0.value >> 5)) + v0.value) ^ (total.value + key[(total.value >> 11) & 3])
	total.value -= delta
	v0.value -= (((v1.value << 4) ^ (v1.value >> 5)) + v1.value) ^ (total.value + key[total.value & 3])

	return v0.value, v1.value


	# test
	if __name__ == "__main__":
	# 待加密的明文，两个 32 位整型，即 64bit 的明文数据
	value = [0x6869216f, 0x61636961]
	# 四个 key，每个是 32bit，即密钥长度为 128bit
	key = [0x1, 0x2, 0x3, 0x4]

	print("Data is : ", hex(value[0]), hex(value[1]))
	res = encrypt(value, key)
	print("Encrypted data is : ", hex(res[0]), hex(res[1]))
	res = decrypt(res, key)
	print("Decrypted data is : ", hex(res[0]), hex(res[1]))
	"""
	Data is : 0x6869216f 0x61636961
	Encrypted data is : 0x39f25ea9 0x92754c5d
	Decrypted data is : 0x6869216f 0x61636961
	"""

	#include <stdio.h>
	#include <stdint.h>

	// 加密函数
	void encrypt(uint32_t v[2], uint32_t const key[4]) {
	unsigned int i;
	uint32_t v0 = v[0], v1 = v[1], sum = 0, delta = 0x9E3779B9;
	for (i = 0; i < 32; i++) {
	v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
	sum += delta;
	v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + key[(sum >> 11) & 3]);
	}
	v[0] = v0; v[1] = v1;
	}

	// 解密函数
	void decrypt(uint32_t v[2], uint32_t const key[4]) {
	unsigned int i;
	uint32_t v0 = v[0], v1 = v[1], delta = 0x9E3779B9, sum = delta*32;
	for (i = 0; i < 32; i++) {
	v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + key[(sum >> 11) & 3]);
	sum -= delta;
	v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
	}
	v[0] = v0; v[1] = v1;
	}

	int main()
	{
	//v 为要加解密的数据，两个 32 位无符号整数
	uint32_t v[2] = { 0x6869216f, 0x61636961 };
	//k 为加解密密钥，4 个 32 位无符号整数，密钥长度为 128 位
	uint32_t k[4] = { 0x1, 0x2, 0x3, 0x4 };
	int n = sizeof(v) / sizeof(uint32_t);
	printf("Data is : 0x%x 0x%x\n", v[0], v[1]);
	encrypt(v, k);
	printf("Encrypted data is : 0x%x 0x%x\n", v[0], v[1]);
	decrypt(v, k);
	printf("Decrypted data is : 0x%x 0x%x\n", v[0], v[1]);
	return 0;
	}
	/*
	Data is : 0x6869216f 0x61636961
	Encrypted data is : 0x39f25ea9 0x92754c5d
	Decrypted data is : 0x6869216f 0x61636961
	*/

	from ctypes import *


	def MX(z, y, total, key, p, e):
	temp1 = (z.value >> 5 ^ y.value << 2) + (y.value >> 3 ^ z.value << 4)
	temp2 = (total.value ^ y.value) + (key[(p & 3) ^ e.value] ^ z.value)

	return c_uint32(temp1 ^ temp2)


	def encrypt(n, v, key):
	delta = 0x9e3779b9
	rounds = 6 + 52 // n

	total = c_uint32(0)
	z = c_uint32(v[n - 1])
	e = c_uint32(0)

	while rounds > 0:
	total.value += delta
	e.value = (total.value >> 2) & 3
	for p in range(n - 1):
	y = c_uint32(v[p + 1])
	v[p] = c_uint32(v[p] + MX(z, y, total, key, p, e).value).value
	z.value = v[p]
	y = c_uint32(v[0])
	v[n - 1] = c_uint32(v[n - 1] + MX(z, y, total, key, n - 1, e).value).value
	z.value = v[n - 1]
	rounds -= 1

	return v


	def decrypt(n, v, key):
	delta = 0x9e3779b9
	rounds = 6 + 52 // n

	total = c_uint32(rounds * delta)
	y = c_uint32(v[0])
	e = c_uint32(0)

	while rounds > 0:
	e.value = (total.value >> 2) & 3
	for p in range(n - 1, 0, -1):
	z = c_uint32(v[p - 1])
	v[p] = c_uint32((v[p] - MX(z, y, total, key, p, e).value)).value
	y.value = v[p]
	z = c_uint32(v[n - 1])
	v[0] = c_uint32(v[0] - MX(z, y, total, key, 0, e).value).value
	y.value = v[0]
	total.value -= delta
	rounds -= 1

	return v


	# test
	if __name__ == "__main__":
	# 该算法中每次可加密不只 64bit 的数据，并且加密的轮数由加密数据长度决定
	v = [0x6869216f, 0x61636961]
	k = [0x1, 0x2, 0x3, 0x4]
	n = 2

	print("Data is : ", hex(v[0]), hex(v[1]))
	res = encrypt(n, v, k)
	print("Encrypted data is : ", hex(res[0]), hex(res[1]))
	res = decrypt(n, res, k)
	print("Decrypted data is : ", hex(res[0]), hex(res[1]))
	"""
	Data is : 0x6869216f 0x61636961
	Encrypted data is : 0x973cd3b0 0x797bf2ab
	Decrypted data is : 0x6869216f 0x61636961
	"""

	#include <stdio.h>
	#include <stdint.h>
	#define DELTA 0x9e3779b9
	#define MX (((z>>5^y<<2) + (y>>3^z<<4)) ^ ((sum^y) + (key[(p&3)^e] ^ z)))

	void btea(uint32_t *v, int n, uint32_t const key[4])
	{
	uint32_t y, z, sum;
	unsigned p, rounds, e;
	// 加密
	if (n > 1)
	{
	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);
	}
	// 解密
	else if (n < -1)
	{
	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);
	}
	}

	int main()
	{
	/*
	该算法中每次可加密不只 64bit 的数据，并且加密的轮数由加密数据长度决定
	*/
	uint32_t v[2] = {0x6869216f, 0x61636961 };
	uint32_t const k[4] = {0x1, 0x2, 0x3, 0x4};

	//n 的绝对值表示 v 的长度，取正表示加密，取负表示解密
	int n = sizeof(v) / sizeof(uint32_t);

	printf("Data is : 0x%x 0x%x\n", v[0], v[1]);
	btea(v, n, k);
	printf("Encrypted data is : 0x%x 0x%x\n", v[0], v[1]);
	btea(v, -n, k);
	printf("Decrypted data is : 0x%x 0x%x\n", v[0], v[1]);
	return 0;
	}
	/*
	Data is : 0x6869216f 0x61636961
	Encrypted data is : 0x973cd3b0 0x797bf2ab
	Decrypted data is : 0x6869216f 0x61636961
	*/

# AES

	from Crypto.Cipher import AES

	password = b'secret!!secret!!' # 秘钥必须为 16 字节或者 16 字节的倍数的字节型数据
	text = b'TextTextTextText' # 明文必须为 16 字节或者 16 字节的倍数的字节型数据，如果不够 16 字节需要进行补全
	aes = AES.new(password, AES.MODE_ECB) # 创建一个 aes 对象
	# AES.MODE_ECB 表示模式是 ECB 模式
	en_text = aes.encrypt(text) # 加密明文
	print("密文：", en_text) # 加密明文，bytes 类型
	de_text = aes.decrypt(en_text) # 解密密文
	print("明文：", de_text)
	'''
	密文： b'\t9\x9b\xc5\x19E\xeb4oL\x1a`\xc7\x8b\xd4\xb2'
	明文： b'TextTextTextText'
	'''

todo

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

	typedef struct{
	uint32_t eK[44], dK[44]; // encKey, decKey
	int Nr; // 10 rounds
	}AesKey;

	#define BLOCKSIZE 16 //AES-128 分组长度为 16 字节

	// uint8_t y[4] -> uint32_t x
	#define LOAD32H(x, y) \
	do { (x) = ((uint32_t)((y)[0] & 0xff)<<24) \| ((uint32_t)((y)[1] & 0xff)<<16) \| \
	((uint32_t)((y)[2] & 0xff)<<8) \| ((uint32_t)((y)[3] & 0xff));} while(0)

	// uint32_t x -> uint8_t y[4]
	#define STORE32H(x, y) \
	do { (y)[0] = (uint8_t)(((x)>>24) & 0xff); (y)[1] = (uint8_t)(((x)>>16) & 0xff); \
	(y)[2] = (uint8_t)(((x)>>8) & 0xff); (y)[3] = (uint8_t)((x) & 0xff); } while(0)

	// 从 uint32_t x 中提取从低位开始的第 n 个字节
	#define BYTE(x, n) (((x) >> (8 * (n))) & 0xff)

	/* used for keyExpansion */
	// 字节替换然后循环左移 1 位
	#define MIX(x) (((S[BYTE(x, 2)] << 24) & 0xff000000) ^ ((S[BYTE(x, 1)] << 16) & 0xff0000) ^ \
	((S[BYTE(x, 0)] << 8) & 0xff00) ^ (S[BYTE(x, 3)] & 0xff))

	//uint32_t x 循环左移 n 位
	#define ROF32(x, n) (((x) << (n)) \| ((x) >> (32-(n))))
	//uint32_t x 循环右移 n 位
	#define ROR32(x, n) (((x) >> (n)) \| ((x) << (32-(n))))

	/* for 128-bit blocks, Rijndael never uses more than 10 rcon values */
	// AES-128 轮常量
	static const uint32_t rcon[10] = {
	0x01000000UL, 0x02000000UL, 0x04000000UL, 0x08000000UL, 0x10000000UL,
	0x20000000UL, 0x40000000UL, 0x80000000UL, 0x1B000000UL, 0x36000000UL
	};
	// S 盒

	unsigned char S[256] = {
	0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
	0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
	0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
	0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
	0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
	0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
	0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
	0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
	0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
	0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
	0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
	0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
	0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
	0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
	0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
	0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
	};




	// 逆 S 盒
	unsigned char inv_S[256] = {
	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
	};

	/* copy in[16] to state[4][4] */
	int loadStateArray(uint8_t (state)[4], const uint8_t in) {
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) {
	state[j][i] = *in++;
	}
	}
	return 0;
	}

	/* copy state[4][4] to out[16] */
	int storeStateArray(uint8_t (state)[4], uint8_t out) {
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) {
	*out++ = state[j][i];
	}
	}
	return 0;
	}
	// 秘钥扩展
	int keyExpansion(const uint8_t key, uint32_t keyLen, AesKey aesKey) {

	if (NULL == key \|\| NULL == aesKey){
	printf("keyExpansion param is NULL\n");
	return -1;
	}

	if (keyLen != 16){
	printf("keyExpansion keyLen = %d, Not support.\n", keyLen);
	return -1;
	}

	uint32_t *w = aesKey->eK; // 加密秘钥
	uint32_t *v = aesKey->dK; // 解密秘钥

	/* keyLen is 16 Bytes, generate uint32_t W[44]. */

	/* W[0-3] */
	for (int i = 0; i < 4; ++i) {
	LOAD32H(w[i], key + 4*i);
	}

	/* W[4-43] */
	for (int i = 0; i < 10; ++i) {
	w[4] = w[0] ^ MIX(w[3]) ^ rcon[i];
	w[5] = w[1] ^ w[4];
	w[6] = w[2] ^ w[5];
	w[7] = w[3] ^ w[6];
	w += 4;
	}

	w = aesKey->eK+44 - 4;
	// 解密秘钥矩阵为加密秘钥矩阵的倒序，方便使用，把 ek 的 11 个矩阵倒序排列分配给 dk 作为解密秘钥
	// 即 dk [0-3]=ek [41-44], dk [4-7]=ek [37-40]... dk [41-44]=ek [0-3]
	for (int j = 0; j < 11; ++j) {

	for (int i = 0; i < 4; ++i) {
	v[i] = w[i];
	}
	w -= 4;
	v += 4;
	}

	return 0;
	}

	// 轮秘钥加
	int addRoundKey(uint8_t (state)[4], const uint32_t key) {
	uint8_t k[4][4];

	/* i: row, j: col */
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) {
	k[i][j] = (uint8_t) BYTE(key[j], 3 - i); /* 把 uint32 key [4] 先转换为矩阵 uint8 k [4][4] */
	state[i][j] ^= k[i][j];
	}
	}

	return 0;
	}

	// 字节替换
	int subBytes(uint8_t (*state)[4]) {
	/* i: row, j: col */
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) {
	state[i][j] = S[state[i][j]]; // 直接使用原始字节作为 S 盒数据下标
	}
	}

	return 0;
	}

	// 逆字节替换
	int invSubBytes(uint8_t (*state)[4]) {
	/* i: row, j: col */
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) {
	state[i][j] = inv_S[state[i][j]];
	}
	}
	return 0;
	}

	// 行移位
	int shiftRows(uint8_t (*state)[4]) {
	uint32_t block[4] = {0};

	/* i: row */
	for (int i = 0; i < 4; ++i) {
	// 便于行循环移位，先把一行 4 字节拼成 uint_32 结构，移位后再转成独立的 4 个字节 uint8_t
	LOAD32H(block[i], state[i]);
	block[i] = ROF32(block[i], 8*i);
	STORE32H(block[i], state[i]);
	}

	return 0;
	}

	// 逆行移位
	int invShiftRows(uint8_t (*state)[4]) {
	uint32_t block[4] = {0};

	/* i: row */
	for (int i = 0; i < 4; ++i) {
	LOAD32H(block[i], state[i]);
	block[i] = ROR32(block[i], 8*i);
	STORE32H(block[i], state[i]);
	}

	return 0;
	}

	/* Galois Field (256) Multiplication of two Bytes */
	// 两字节的伽罗华域乘法运算
	uint8_t GMul(uint8_t u, uint8_t v) {
	uint8_t p = 0;

	for (int i = 0; i < 8; ++i) {
	if (u & 0x01) { //
	p ^= v;
	}

	int flag = (v & 0x80);
	v <<= 1;
	if (flag) {
	v ^= 0x1B; /* x^8 + x^4 + x^3 + x + 1 */
	}

	u >>= 1;
	}

	return p;
	}

	// 列混合
	int mixColumns(uint8_t (*state)[4]) {
	uint8_t tmp[4][4];
	uint8_t M[4][4] = <!--swig0-->;

	/* copy state[4][4] to tmp[4][4] */
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j){
	tmp[i][j] = state[i][j];
	}
	}

	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) { // 伽罗华域加法和乘法
	state[i][j] = GMul(M[i][0], tmp[0][j]) ^ GMul(M[i][1], tmp[1][j])
	^ GMul(M[i][2], tmp[2][j]) ^ GMul(M[i][3], tmp[3][j]);
	}
	}

	return 0;
	}

	// 逆列混合
	int invMixColumns(uint8_t (*state)[4]) {
	uint8_t tmp[4][4];
	uint8_t M[4][4] = <!--swig1-->; // 使用列混合矩阵的逆矩阵

	/* copy state[4][4] to tmp[4][4] */
	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j){
	tmp[i][j] = state[i][j];
	}
	}

	for (int i = 0; i < 4; ++i) {
	for (int j = 0; j < 4; ++j) {
	state[i][j] = GMul(M[i][0], tmp[0][j]) ^ GMul(M[i][1], tmp[1][j])
	^ GMul(M[i][2], tmp[2][j]) ^ GMul(M[i][3], tmp[3][j]);
	}
	}

	return 0;
	}

	// AES-128 加密接口，输入 key 应为 16 字节长度，输入长度应该是 16 字节整倍数，
	// 这样输出长度与输入长度相同，函数调用外部为输出数据分配内存
	int aesEncrypt(const uint8_t key, uint32_t keyLen, const uint8_t pt, uint8_t *ct, uint32_t len) {

	AesKey aesKey;
	uint8_t *pos = ct;
	const uint32_t *rk = aesKey.eK; // 解密秘钥指针
	uint8_t out[BLOCKSIZE] = {0};
	uint8_t actualKey[16] = {0};
	uint8_t state[4][4] = {0};

	if (NULL == key \|\| NULL == pt \|\| NULL == ct){
	printf("param err.\n");
	return -1;
	}

	if (keyLen > 16){
	printf("keyLen must be 16.\n");
	return -1;
	}

	if (len % BLOCKSIZE){
	printf("inLen is invalid.\n");
	return -1;
	}

	memcpy(actualKey, key, keyLen);
	keyExpansion(actualKey, 16, &aesKey); // 秘钥扩展

	// 使用 ECB 模式循环加密多个分组长度的数据
	for (int i = 0; i < len; i += BLOCKSIZE) {
	// 把 16 字节的明文转换为 4x4 状态矩阵来进行处理
	loadStateArray(state, pt);
	// 轮秘钥加
	addRoundKey(state, rk);

	for (int j = 1; j < 10; ++j) {
	rk += 4;
	subBytes(state); // 字节替换
	shiftRows(state); // 行移位
	mixColumns(state); // 列混合
	addRoundKey(state, rk); // 轮秘钥加
	}

	subBytes(state); // 字节替换
	shiftRows(state); // 行移位
	// 此处不进行列混合
	addRoundKey(state, rk+4); // 轮秘钥加

	// 把 4x4 状态矩阵转换为 uint8_t 一维数组输出保存
	storeStateArray(state, pos);

	pos += BLOCKSIZE; // 加密数据内存指针移动到下一个分组
	pt += BLOCKSIZE; // 明文数据指针移动到下一个分组
	rk = aesKey.eK; // 恢复 rk 指针到秘钥初始位置
	}
	return 0;
	}

	// AES128 解密，参数要求同加密
	int aesDecrypt(const uint8_t key, uint32_t keyLen, const uint8_t ct, uint8_t *pt, uint32_t len) {
	AesKey aesKey;
	uint8_t *pos = pt;
	const uint32_t *rk = aesKey.dK; // 解密秘钥指针
	uint8_t out[BLOCKSIZE] = {0};
	uint8_t actualKey[16] = {0};
	uint8_t state[4][4] = {0};

	if (NULL == key \|\| NULL == ct \|\| NULL == pt){
	printf("param err.\n");
	return -1;
	}

	if (keyLen > 16){
	printf("keyLen must be 16.\n");
	return -1;
	}

	if (len % BLOCKSIZE){
	printf("inLen is invalid.\n");
	return -1;
	}

	memcpy(actualKey, key, keyLen);
	keyExpansion(actualKey, 16, &aesKey); // 秘钥扩展，同加密

	for (int i = 0; i < len; i += BLOCKSIZE) {
	// 把 16 字节的密文转换为 4x4 状态矩阵来进行处理
	loadStateArray(state, ct);
	// 轮秘钥加，同加密
	addRoundKey(state, rk);

	for (int j = 1; j < 10; ++j) {
	rk += 4;
	invShiftRows(state); // 逆行移位
	invSubBytes(state); // 逆字节替换，这两步顺序可以颠倒
	addRoundKey(state, rk); // 轮秘钥加，同加密
	invMixColumns(state); // 逆列混合
	}

	invSubBytes(state); // 逆字节替换
	invShiftRows(state); // 逆行移位
	// 此处没有逆列混合
	addRoundKey(state, rk+4); // 轮秘钥加，同加密

	storeStateArray(state, pos); // 保存明文数据
	pos += BLOCKSIZE; // 输出数据内存指针移位分组长度
	ct += BLOCKSIZE; // 输入数据内存指针移位分组长度
	rk = aesKey.dK; // 恢复 rk 指针到秘钥初始位置
	}
	return 0;
	}

	// 方便输出 16 进制数据
	void printHex(uint8_t ptr, int len, char tag) {
	printf("%s\ndata[%d]: ", tag, len);
	for (int i = 0; i < len; ++i) {
	printf("%.2X ", *ptr++);
	}
	printf("\n");
	}

	//S 盒转逆 S 盒，S 盒不是标准的时候使用
	void get_S_rev(){
	uint8_t line=0,rol=0;// 位置
	for(int i=0;i<256;i++){
	line = (S[i]&0xf0)>>4;
	rol = S[i]&0xf;
	inv_S[line*16+rol] = i;
	}
	}
	int main() {
	//get_S_rev ();//S 盒有变化，需要求出逆 S 盒



	const uint8_t key[16] = {0x73,0x65,0x63,0x72,0x65,0x74,0x21,0x21,0x73,0x65,0x63,0x72,0x65,0x74,0x21,0x21};
	const uint8_t pt[16]={0x54,0x65,0x78,0x74,0x54,0x65,0x78,0x74,0x54,0x65,0x78,0x74,0x54,0x65,0x78,0x74};
	uint8_t ct[16] = {0}; // 外部申请输出数据内存，用于加密后的数据
	uint8_t plain[16] = {0}; // 外部申请输出数据内存，用于解密后的数据
	aesEncrypt(key, 16, pt, ct, 16); // 加密
	printHex(ct, 16, "after encryption:"); // 打印加密后的密文


	aesDecrypt(key, 16, ct, plain, 16); // 解密
	printHex(plain, 16, "after decryption:"); // 打印解密后的明文数据.
	return 0;
	}
	/*
	after encryption:
	data[16]: 09 39 9B C5 19 45 EB 34 6F 4C 1A 60 C7 8B D4 B2
	after decryption:
	data[16]: 54 65 78 74 54 65 78 74 54 65 78 74 54 65 78 74
	*/

	from Crypto.Cipher import AES

	password = b'secret!!secret!!' # 秘钥必须为 16 字节或者 16 字节的倍数的字节型数据
	iv = b'1234567812345678' # iv 偏移量，bytes 类型
	text = b'TextTextTextText' # 明文必须为 16 字节或者 16 字节的倍数的字节型数据，如果不够 16 字节需要进行补全
	aes = AES.new(password, AES.MODE_CBC, iv) # 创建一个 aes 对象
	# AES.MODE_CBC 表示模式是 CBC 模式
	en_text = aes.encrypt(text)
	print("密文：", en_text) # 加密明文，bytes 类型
	aes = AES.new(password, AES.MODE_CBC, iv) # CBC 模式下解密需要重新创建一个 aes 对象
	de_text = aes.decrypt(en_text)
	print("明文：", de_text)
	'''
	密文： b'v\rv`HDi\xbbV\xcb\xef\x02\x8f\x93\xb09'
	明文： b'TextTextTextText'
	'''

todo

todo

# MD5

	from hashlib import md5

	s = 'oacia'
	new_md5 = md5()
	new_md5.update(s.encode(encoding='utf-8'))
	s_enc = new_md5.hexdigest()
	print(s_enc)# 6a58e79a78afc9dd94485810106bc7e8

	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include "md5.h"


	void md5_enc(unsigned char encrypt[],unsigned char decrypt[]){
	MD5_CTX md5;
	MD5Init(&md5);
	MD5Update(&md5,encrypt,strlen((char *)encrypt));
	MD5Final(&md5,decrypt);
	}

	int main(int argc, char *argv[])
	{
	char s[10] = "oacia";
	unsigned char* s_enc;
	md5_enc(s,s_enc);
	for(int i=0;i<16;i++){
	printf("%02x",s_enc[i]);//6a58e79a78afc9dd94485810106bc7e8
	}

	return 0;
	}

	#include <memory.h>
	#include "md5.h"

	unsigned char 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 MD5Init(MD5_CTX *context)
	{
	//md5 原始常量
	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 MD5Update(MD5_CTX context,unsigned char input,unsigned int inputlen)
	{
	unsigned int 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);
	MD5Transform(context->state,context->buffer);
	for(i = partlen;i+64 <= inputlen;i+=64)
	MD5Transform(context->state,&input[i]);
	index = 0;
	}
	else
	{
	i = 0;
	}
	memcpy(&context->buffer[index],&input[i],inputlen-i);
	}
	void MD5Final(MD5_CTX *context,unsigned char digest[16])
	{
	unsigned int index = 0,padlen = 0;
	unsigned char bits[8];
	index = (context->count[0] >> 3) & 0x3F;
	padlen = (index < 56)?(56-index):(120-index);
	MD5Encode(bits,context->count,8);
	MD5Update(context,PADDING,padlen);
	MD5Update(context,bits,8);
	MD5Encode(digest,context->state,16);
	}
	void MD5Encode(unsigned char output,unsigned int input,unsigned int len)
	{
	unsigned int 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 MD5Decode(unsigned int output,unsigned char input,unsigned int len)
	{
	unsigned int 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 MD5Transform(unsigned int state[4],unsigned char block[64])
	{
	unsigned int a = state[0];
	unsigned int b = state[1];
	unsigned int c = state[2];
	unsigned int d = state[3];
	unsigned int x[64];
	MD5Decode(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;
	}

	#ifndef MD5_H
	#define MD5_H

	typedef struct
	{
	unsigned int count[2];
	unsigned int state[4];
	unsigned char buffer[64];
	}MD5_CTX;


	#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 + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
	}
	#define GG(a,b,c,d,x,s,ac) \
	{ \
	a += G(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
	}
	#define HH(a,b,c,d,x,s,ac) \
	{ \
	a += H(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
	}
	#define II(a,b,c,d,x,s,ac) \
	{ \
	a += I(b,c,d) + x + ac; \
	a = ROTATE_LEFT(a,s); \
	a += b; \
	}
	void MD5Init(MD5_CTX *context);
	void MD5Update(MD5_CTX context,unsigned char input,unsigned int inputlen);
	void MD5Final(MD5_CTX *context,unsigned char digest[16]);
	void MD5Transform(unsigned int state[4],unsigned char block[64]);
	void MD5Encode(unsigned char output,unsigned int input,unsigned int len);
	void MD5Decode(unsigned int output,unsigned char input,unsigned int len);

	#endif

# DES

# base

	import base64

	str = "this is base64!" # 欲解密的字符串
	outtab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" # 原生字母表
	# 如果遇到换表 base64, 修改 intab!!
	intab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" # 换表之后的字母表

	ciphertext = base64.b64encode(str.translate(str.maketrans(intab, outtab)).encode())
	print("ciphertext:", ciphertext)

	ciphertext = ciphertext.decode()
	decrypted = base64.b64decode(ciphertext.translate(ciphertext.maketrans(intab, outtab)))
	print("decrypted:", decrypted)
	'''
	ciphertext: b'dGhpcyBpcyBiYXNlNjQh'
	decrypted: b'this is base64!
	'''

	import string

	# base 字符集

	base64_charset = string.ascii_uppercase + string.ascii_lowercase + string.digits + '+/'


	def encrypt(origin_bytes):
	"""
	将bytes类型编码为base64
	:param origin_bytes:需要编码的bytes
	:return:base64字符串
	"""

	# 将每一位 bytes 转换为二进制字符串
	base64_bytes = ['{:0>8}'.format(str(bin(b)).replace('0b', '')) for b in origin_bytes]

	resp = ''
	nums = len(base64_bytes) // 3
	remain = len(base64_bytes) % 3

	integral_part = base64_bytes[0:3 * nums]
	while integral_part:
	# 取三个字节，以每 6 比特，转换为 4 个整数
	tmp_unit = ''.join(integral_part[0:3])
	tmp_unit = [int(tmp_unit[x: x + 6], 2) for x in [0, 6, 12, 18]]
	# 取对应 base64 字符
	resp += ''.join([base64_charset[i] for i in tmp_unit])
	integral_part = integral_part[3:]

	if remain:
	# 补齐三个字节，每个字节补充 0000 0000
	remain_part = ''.join(base64_bytes[3 * nums:]) + (3 - remain) * '0' * 8
	# 取三个字节，以每 6 比特，转换为 4 个整数
	# 剩余 1 字节可构造 2 个 base64 字符，补充 ==；剩余 2 字节可构造 3 个 base64 字符，补充 =
	tmp_unit = [int(remain_part[x: x + 6], 2) for x in [0, 6, 12, 18]][:remain + 1]
	resp += ''.join([base64_charset[i] for i in tmp_unit]) + (3 - remain) * '='

	return resp


	def decrypt(base64_str):
	"""
	解码base64字符串
	:param base64_str:base64字符串
	:return:解码后的bytearray；若入参不是合法base64字符串，返回空bytearray
	"""
	if not valid_base64_str(base64_str):
	return bytearray()

	# 对每一个 base64 字符取下标索引，并转换为 6 为二进制字符串
	base64_bytes = ['{:0>6}'.format(str(bin(base64_charset.index(s))).replace('0b', '')) for s in base64_str if
	s != '=']
	resp = bytearray()
	nums = len(base64_bytes) // 4
	remain = len(base64_bytes) % 4
	integral_part = base64_bytes[0:4 * nums]

	while integral_part:
	# 取 4 个 6 位 base64 字符，作为 3 个字节
	tmp_unit = ''.join(integral_part[0:4])
	tmp_unit = [int(tmp_unit[x: x + 8], 2) for x in [0, 8, 16]]
	for i in tmp_unit:
	resp.append(i)
	integral_part = integral_part[4:]

	if remain:
	remain_part = ''.join(base64_bytes[nums * 4:])
	tmp_unit = [int(remain_part[i * 8:(i + 1) * 8], 2) for i in range(remain - 1)]
	for i in tmp_unit:
	resp.append(i)

	return resp


	def valid_base64_str(b_str):
	"""
	验证是否为合法base64字符串
	:param b_str: 待验证的base64字符串
	:return:是否合法
	"""
	if len(b_str) % 4:
	return False

	for m in b_str:
	if m not in base64_charset:
	return False
	return True


	if __name__ == '__main__':
	s = 'this is base64!'

	ciphertext = encrypt(s.encode())
	print('ciphertext:', ciphertext)

	decrypted = decrypt(ciphertext).decode()
	print('decrypted:', decrypted)
	'''
	ciphertext: dGhpcyBpcyBiYXNlNjQh
	decrypted: this is base64!
	'''

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

	unsigned char base64_encode(unsigned char str)
	{
	long len;
	long str_len;
	unsigned char *res;
	int i,j;
	// 定义 base64 编码表
	unsigned char *base64_table="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

	// 计算经过 base64 编码后的字符串长度
	str_len=strlen(str);
	if(str_len % 3 == 0)
	len=str_len/3*4;
	else
	len=(str_len/3+1)*4;

	res=malloc(sizeof(unsigned char)*len+1);
	res[len]='\0';

	// 以 3 个 8 位字符为一组进行编码
	for(i=0,j=0;i<len-2;j+=3,i+=4)
	{
	res[i]=base64_table[str[j]>>2]; // 取出第一个字符的前 6 位并找出对应的结果字符
	res[i+1]=base64_table[(str[j]&0x3)<<4 \| (str[j+1]>>4)]; // 将第一个字符的后位与第二个字符的前 4 位进行组合并找到对应的结果字符
	res[i+2]=base64_table[(str[j+1]&0xf)<<2 \| (str[j+2]>>6)]; // 将第二个字符的后 4 位与第三个字符的前 2 位组合并找出对应的结果字符
	res[i+3]=base64_table[str[j+2]&0x3f]; // 取出第三个字符的后 6 位并找出结果字符
	}

	switch(str_len % 3)
	{
	case 1:
	res[i-2]='=';
	res[i-1]='=';
	break;
	case 2:
	res[i-1]='=';
	break;
	}

	return res;
	}

	unsigned char base64_decode(unsigned char code)
	{
	// 根据 base64 表，以字符找到对应的十进制数据
	int table[]={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,
	0,0,0,0,0,0,0,62,0,0,0,
	63,52,53,54,55,56,57,58,
	59,60,61,0,0,0,0,0,0,0,0,
	1,2,3,4,5,6,7,8,9,10,11,12,
	13,14,15,16,17,18,19,20,21,
	22,23,24,25,0,0,0,0,0,0,26,
	27,28,29,30,31,32,33,34,35,
	36,37,38,39,40,41,42,43,44,
	45,46,47,48,49,50,51
	};
	long len;
	long str_len;
	unsigned char *res;
	int i,j;

	// 计算解码后的字符串长度
	len=strlen(code);
	// 判断编码后的字符串后是否有 =
	if(strstr(code,"=="))
	str_len=len/4*3-2;
	else if(strstr(code,"="))
	str_len=len/4*3-1;
	else
	str_len=len/4*3;

	res=malloc(sizeof(unsigned char)*str_len+1);
	res[str_len]='\0';

	// 以 4 个字符为一位进行解码
	for(i=0,j=0;i < len-2;j+=3,i+=4)
	{
	res[j]=((unsigned char)table[code[i]])<<2 \| (((unsigned char)table[code[i+1]])>>4); // 取出第一个字符对应 base64 表的十进制数的前 6 位与第二个字符对应 base64 表的十进制数的后 2 位进行组合
	res[j+1]=(((unsigned char)table[code[i+1]])<<4) \| (((unsigned char)table[code[i+2]])>>2); // 取出第二个字符对应 base64 表的十进制数的后 4 位与第三个字符对应 bas464 表的十进制数的后 4 位进行组合
	res[j+2]=(((unsigned char)table[code[i+2]])<<6) \| ((unsigned char)table[code[i+3]]); // 取出第三个字符对应 base64 表的十进制数的后 2 位与第 4 个字符进行组合
	}

	return res;

	}




	int main(int argc,char **argv)
	{
	unsigned char *buf =NULL;
	unsigned char *str = "this is base64!";
	buf = base64_encode(str);
	printf("cipheytext: %s\n",buf);

	buf = base64_decode(buf);
	printf("decrypted: %s\n",buf);
	free(buf);

	return 0;
	}
	/*
	cipheytext: dGhpcyBpcyBiYXNlNjQh
	decrypted: this is base64!
	*/

todo

todo

todo

todo

todo

todo

# blowfish

# chacha20

逆向算法