加密与解密算法

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#include <iostream>

static void encrypt(unsigned char* pBuff, int iCnt)
{
	int i = 0;
	const char* XorKeyChar = "72f80deb855afd01a8ef0d5e6455ecb8ed8eda";
	const char* AddKeyChar = "d3b52f85fd2fe9b86cb21150621ee25c113508";

	if (iCnt > 8)
	{
		for (i = 0; i < (iCnt / 8); i++)
		{
			encrypt(pBuff + i * 8, 8);
		}
		encrypt(pBuff + i * 8, (iCnt % 8));
	}
	else
	{
		for (i = 0; i < iCnt; i++)
		{
			pBuff[i] = pBuff[i] ^ XorKeyChar[i];
			pBuff[i] = ~pBuff[i];
			pBuff[i] = pBuff[i] - AddKeyChar[i];
		}
	}
}

void decrypt(unsigned char* pBuff, int iCnt)
{
	int i = 0;
	const char* XorKeyChar = "72f80deb855afd01a8ef0d5e6455ecb8ed8eda";
	const char* AddKeyChar = "d3b52f85fd2fe9b86cb21150621ee25c113508";

	if (iCnt > 8)
	{
		for (i = 0; i < (iCnt / 8); i++)
		{
			decrypt(pBuff + i * 8, 8);
		}
		decrypt(pBuff + i * 8, (iCnt % 8));
	}
	else
	{
		for (i = 0; i < iCnt; i++)
		{
			pBuff[i] = pBuff[i] + AddKeyChar[i];
			pBuff[i] = ~pBuff[i];
			pBuff[i] = pBuff[i] ^ XorKeyChar[i];
		}
	}
}

int main() {
	unsigned char data[] = "hello world";

	printf("data : %s\n", data);

	encrypt(data, strlen((const char *)data));
	printf("encrypt data : %s\n", data);

	decrypt(data, strlen((const char*)data));
	printf("decrypt data : %s\n", data);

	return 0;
}