xor.ts

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import { BaseCipher } from "../base/baseCipher";
 
export class XORCipher extends BaseCipher {
    readonly CipherName = "XOR";
 
    constructor() {
        super();
    }
 
    encode(plaintext: string, key: string): string {
        if (!key) {
            throw new Error("Key required");
        }
 
        const keyBuffer = Buffer.from(key);
        const plainBuffer = Buffer.from(plaintext);
        const output = Buffer.alloc(plainBuffer.length);
 
        for (let i = 0; i < plainBuffer.length; i++) {
            output[i] = plainBuffer[i] ^ keyBuffer[i % keyBuffer.length];
        }
 
        return output.toString("hex");
    }
 
    decode(ciphertext: string, key: string): string {
        if (!key) {
            throw new Error("Key required");
        }
 
        const keyBuffer = Buffer.from(key);
        const cipherBuffer = Buffer.from(ciphertext, "hex");
        const output = Buffer.alloc(cipherBuffer.length);
 
        for (let i = 0; i < cipherBuffer.length; i++) {
            output[i] = cipherBuffer[i] ^ keyBuffer[i % keyBuffer.length];
        }
 
        return output.toString();
    }
}