Class: Cipher
Instances of the Cipher class are used to encrypt data. The class can be used in one of two ways:
- As a stream that is both readable and writable, where plain unencrypted data is written to produce encrypted data on the readable side, or
- Using the
cipher.update()andcipher.final()methods to produce the encrypted data.
The crypto.createCipher() or crypto.createCipheriv() methods are used to create Cipher instances. Cipher objects are not to be created directly using the new keyword.
Example: Using Cipher objects as streams:
const crypto = require('crypto');
const cipher = crypto.createCipher('aes192', 'a password');
var encrypted = '';
cipher.on('readable', () => {
var data = cipher.read();
if (data)
encrypted += data.toString('hex');
});
cipher.on('end', () => {
console.log(encrypted);
// Prints: ca981be48e90867604588e75d04feabb63cc007a8f8ad89b10616ed84d815504
});
cipher.write('some clear text data');
cipher.end();Example: Using Cipher and piped streams:
const crypto = require('crypto');
const fs = require('fs');
const cipher = crypto.createCipher('aes192', 'a password');
const input = fs.createReadStream('test.js');
const output = fs.createWriteStream('test.enc');
input.pipe(cipher).pipe(output);Example: Using the cipher.update() and cipher.final() methods:
const crypto = require('crypto');
const cipher = crypto.createCipher('aes192', 'a password');
var encrypted = cipher.update('some clear text data', 'utf8', 'hex');
encrypted += cipher.final('hex');
console.log(encrypted);
// Prints: ca981be48e90867604588e75d04feabb63cc007a8f8ad89b10616ed84d815504
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