bpoussin / crypto

Libraries of cryptographic functions implemented in JavaScript

crypto

Libraries of cryptographic functions implemented in JavaScript.

aes.js

This is a reference implementation of the algorithm described in the FIPS-197 standard. It implements the standard very closely, in order to aid in understanding the standard and the algorithm itself.

This comprises:

• cipher: takes a 128-bit input block and applies the cipher algorithm to produce a 128-bit output block
• keyExpansion: applies a key expansion to a 128-/192-/256-bit cipher key to produce a 2D byte-array key schedule for the cipher routine

More details are available at www.movable-type.co.uk/scripts/aes.html.

aes-ctr.js

This is a counter-mode (CTR) wrapper for the AES function.

This comprises:

• encrypt: encrypt a plaintext using a supplied password
• decrypt: decrypt an encrypted ciphertext using a supplied password

More details are available at www.movable-type.co.uk/scripts/aes.html.

sha1.js

This is a reference implementation of the algorithm described in the FIPS-180-2 standard. It implements the standard very closely, in order to aid in understanding the standard and the algorithm itself.

This comprises:

• hash: takes a (Unicode) string and generates a hash (of the UTF-8 encoded string)

More details are available at www.movable-type.co.uk/scripts/sha1.html.

sha256.js

This is a reference implementation of the algorithm described in the FIPS-180-2 standard. It implements the standard very closely, in order to aid in understanding the standard and the algorithm itself.

This comprises:

• hash: takes a (Unicode) string and generates a hash (of the UTF-8 encoded string)

More details are available at www.movable-type.co.uk/scripts/sha1.html.

tea-block.js

Wheeler & Needham’s Tiny Encryption Algorithm is a simple but powerful encryption algorithm which provides strong encryption in just a few lines of concise, clear code. This implements the (corrected) ‘Block TEA’ variant (xxtea).

The library includes:

• encrypt a text with a password
• decrypt an encrypted text
• encode an array of longs using a 128-bit key
• decode an encoded array of longs

More details are available at www.movable-type.co.uk/scripts/tea-block.html.

Documentation

Documentation for all these methods is available at www.movable-type.co.uk/scripts/js/crypto/docs.

Browser support

IE9- doesn’t have btoa()/atob(): if you need to support IE9-, you can use David Chambers’ Base64 polyfill.