XOR Encryption

In cryptography, XOR Encryption, also known as XOR Cipher, is a encryption algorithm. With this algorithm, a string of text can be encrypted by applying the bitwise XOR operator to every character using a given key. To decrypt the output, merely reapplying the XOR function with the key will remove the cipher.

• C#
• VB.Net
• C
• C++
• PHP

									/*****Please include following header files*****/
// stdlib.h
// string.h
/***********************************************/

char* XORCipher(char* data, char* key, int dataLen, int keyLen) {
	char* output = (char*)malloc(sizeof(char) * dataLen);

	for (int i = 0; i < dataLen; ++i) {
		output[i] = data[i] ^ key[i % keyLen];
	}

	return output;
}
								

Example

									char* text = "The quick brown fox jumps over the lazy dog.";
char* key = "secret";
int dataLen = strlen(text);
int keyLen = strlen(key);
char* cipherText = XORCipher(text, key, dataLen, keyLen);
char* plainText = XORCipher(cipherText, key, dataLen, keyLen);
								

Output

									cipherText:	"'\r\u0006R\u0014\u0001\u001a\u0006\bR\a\u0006\u001c\u0012\rR\u0003\u001b\vE\t\a\b\u0004\0E\f\u0004\0\u0006S\u0011\v\u0017E\u0018\u0012\u001f\u001aR\u0001\u001b\u0014K"
plainText:	"The quick brown fox jumps over the lazy dog."