/crypto

Libraries of cryptographic functions implemented in JavaScript

Primary LanguageJavaScriptMIT LicenseMIT

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

Note that there are no standards for data storage formats of AES encryption mode wrapper functions, so this is unlikely to inter-operate with standard library functions.

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/sha256.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- (no!), you can use David Chambers’ Base64 polyfill.