GYKH - caesar-cipher

One of the simplest forms of encryption

Install

$ npm install --save @gykh/caesar-cipher

or

$ npm i -S @gykh/caesar-cipher

Usage

Encrypt and decrypt string

const { encryptString, decryptString } = require("@gykh/caesar-cipher");

...

const encrypted = encryptString(str, 3);

const decrypted = decryptString(encrypted, 3);

console.log(str === decrypted); // true

Encrypt and decrypt buffer

const { encrypt, decrypt } = require("@gykh/caesar-cipher");
const fs = require('fs');
const { promisify } = require('util');
const readFile = promisify(fs.readFile);

...

const encrypted = encrypt(await readFile(inputFile), 3);

const decrypted = decrypt(encrypted, 3);

console.log(buffer == decrypted); // true

Encrypt and decrypt streams (Use this in case of input being large data / file)

const { EncryptTransform, DecryptTransform } = require("@gykh/caesar-cipher");
const fs = require('fs'); 

...

const readStream = fs.createReadStream(inputFile);
const writeStream = fs.createWriteStream(outputFile);

const encryptTransform = new EncryptTransform(3);
const decryptTransform = new DecryptTransform(3);

const stream = readStream
    .pipe(encryptTransform)
    .pipe(decryptTransform)
    .pipe(writeStream)

stream.on("error", () => /* do something */);
stream.on("finish", () => /* do something */);

API

caesar-cipher

.encryptString(input, key)

input

Type: string Required

key

Type: number Required

key should be a number between 0-25

.decryptString(input, key)

input

Type: string Required

key

Type: number Required

key should be a number between 0-25

.encrypt(input, key)

input

Type: Buffer Required

key

Type: number Required

key should be a number between 0-25

.decrypt(input, key)

input

Type: Buffer Required

key

Type: number Required

key should be a number between 0-25

new EncryptTransform(key)

key

Type: number Required

key should be a number between 0-25

new DecryptTransform(key)

key

Type: number Required

key should be a number between 0-25

Understand Caesar Cipher

The Caesar cipher, also known as a shift cipher, is one of the simplest forms of encryption. It is a substitution cipher where each letter in the original message (called the plaintext) is replaced with a letter corresponding to a certain number of letters up or down in the alphabet. Learn more

Developer

• Sylvester Das

License

MIT © 2021 get-your-knowledge-here