node-decipher-openssl

Decipher files encrypted with openssl command line from node

Files encrypter using openssl from the command line cannot be directly deciphered using the crypto library. The openssl default options generate a key and iv from a random salt and the secret, and prepend it to the encrypted file.

This module uses stream-peek-remove to extract the salt from the encrypted data, then calculates the key and iv and uses them to decipher the file using crypto.createDecipheriv function.

This module only works with streams as input.

npm install node-decipher-openssl

Usage

const createDecipherOpenssl = require("node-decipher-openssl");
const fs = require("fs");

const readStream = fs.createReadStream("myEncodedFileToRead");
const writeStream = fs.createWriteStream("myDecryptedFile");

try {
  const decipher = await createDecipherOpenssl(readStream, "aes-256-cbc", "mysecret");
  decipher.pipe(writeStream);
} catch (error) {
  // Handle error
}

Parameters

createDecipherOpenssl(readStream, algorithm, key) => Promise;

readStream A readable stream

algorithm A string with the cipher algorithm. Accepts same values as the native crypto.createDecipher method

key A string withe the key used for encrypting the data

The function returns a Promise than can be used with .then().catch() or with async/await

License

MIT