cryptojs (crypto-js)

What is cryptojs?

cryptojs is a library in javascript complete with cryptographic functions including encryption, decryption, and hashing functions. crypto-js is licensed under the MIT license.

crypto-js/hmac-sha256

An HMAC is a message authentication code that uses a hash algorithm. In this example, an HMAC is demonstrated using the sha256 algorithm, but any supported algorithm will work.

var hmac = CryptoJS.HmacSHA256("message", "secretkey");

cryptojs aes encrypt

AES (Advanced Encryption Standard) is a popular symmetric encryption algorithm that uses a shared secret key for both encryption and decryption. The example demonstrates AES encryption with a shared secret key “secretkey”.

function encryptWithSecretOnly() {
   var encrypted = CryptoJS.AES.encrypt("plain text", "secretkey");
}

cryptojs aes decrypt

The example demonstrates the decryption of the previously encrypted data, using the shared secret key “secretkey”.

function decrypt() {
  var encrypted = CryptoJS.AES.encrypt("plain text", "secretkey");
  var bytes  = CryptoJS.AES.decrypt(encrypted, "secretkey");
  var decrypted = bytes.toString(CryptoJS.enc.Utf8);
}

crypto-js hashing algorithm examples

See https://csrc.nist.gov/projects/hash-functions for a more in-depth analysis of the hashing algorithms before making a choice on which algorithm you should use.

cryptojs sha1

SHA1 is a secure hash algorithm that produces a 160 bit output. SHA1 has recently been deemed not secure, and members of the SHA2 family are recommended for cryptographic hashing.

var sha1 = CryptoJS.SHA1(document.getElementById("password").value);

cryptojs sha256

It generates a 32-byte output and is one of the more commonly used hashing algorithms today.

var sha256 = CryptoJS.SHA256(document.getElementById("password").value);

cryptojs sha224

While meeting the security requirement for 112-bits of security, it is 32 bits shorter than SHA256.

var sha224 = CryptoJS.SHA224(document.getElementById("password").value);

cryptojs sha512

Produces 512 bits of output and is probably overkill in the near future.

var sha512 = CryptoJS.SHA512(document.getElementById("password").value);

cryptojs sha384

Useful to generating a 256-bit HMAC key and 128-bit encryption key.

var sha384 = CryptoJS.SHA384(document.getElementById("password").value);

cryptojs sha3

SHA3 is not meant to replace SHA2 but is merely an additional tool in the NIST toolkit.

var sha3 = CryptoJS.SHA3(document.getElementById("password").value);

cryptojs ripemd160

Considered a robust algorithm and alternative to the SHA family.

var ripemd160 = CryptoJS.RIPEMD160(document.getElementById("password").value);

cryptojs md5

MD5 was once one of the more popular hashing algorithms, but has many vulnerabilities and is not recommended today.

var md5 = CryptoJS.MD5(document.getElementById("password").value);

How to install crypto-js with npm

npm install crypto-js

The library may also be used by including the source in a script tag. The sources can be found in the Cloudfare CDN.

jsfiddle examples

jsfiddle cryptojs aes encryption and decryption example

jsfiddle crypto-js hashing algorithm examples

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