jssha

jsSHA

A pure JavaScript streaming implementation of the complete Secure Hash Standard family (SHA-1, SHA-224, SHA3-224, SHA-256, SHA3-256, SHA-384, SHA3-384, SHA-512, SHA3-512, SHAKE128, and SHAKE256) as well as HMAC.

Usage

Installation

Browser

Include the desired JavaScript file (sha.js, sha1.js, sha256.js, sha512.js, or sha3.js) in your header (sha.js used below):

<script type="text/javascript" src="/path/to/sha.js"></script>

Node.js

jsSHA is available through NPM and be installed by simply doing

npm install jssha

To use the module, first require it using:

jsSHA = require("jssha");

Hashing

Instantiate a new jsSHA object with the desired hash type, input type, and options as parameters. The hash type can be one of SHA-1, SHA-224, SHA3-224, SHA-256, SHA3-256, SHA-384, SHA3-384, SHA-512, SHA3-512, SHAKE128, or SHAKE256. The input type can be one of HEX, TEXT, B64, BYTES, or ARRAYBUFFER. You can then stream in input using the update object function, calling it multiple times if needed. Finally, simply call getHash with the output type as a parameter (B64, HEX, BYTES, or ARRAYBUFFER). Example to calculate the SHA-512 of "This is a test":

var shaObj = new jsSHA("SHA-512", "TEXT");
shaObj.update("This is a ");
shaObj.update("test");
var hash = shaObj.getHash("HEX");

The constructor takes a hashmap as a optional third argument with possible properties of numRounds and encoding. numRounds controls the number of hashing iterations/rounds performed and defaults to a value of 1 if not specified. encoding specifies the encoding used to encode TEXT-type inputs. Valid options are "UTF8", "UTF16BE", and "UTF16LE", it defaults to "UTF8".

getHash also takes a hashmap as an optional second argument. By default the hashmap is {"outputUpper" : false, "b64Pad" : "="}. These options are intelligently interpreted based upon the chosen output format. Important: SHAKE128 and SHAKE256 require shakeLen to be included in the hashmap where shakeLen is the desired output length of the SHAKE algorithm in a multiple of 8 bits.

HMAC

Instantiate a new jsSHA object the same way as for hashing. Then set the HMAC key to be used by calling setHMACKey with the key and its input type (this MUST be done before calling update). You can stream in the input using the update object function just like hashing. Finally, get the HMAC by calling the getHMAC function with the output type as its argument. Example to calculate the SHA-512 HMAC of the string "This is a test" with the key "abc":

var shaObj = new jsSHA("SHA-512", "TEXT");
shaObj.setHMACKey("abc", "TEXT");
shaObj.update("This is a ");
shaObj.update("test");
var hmac = shaObj.getHMAC("HEX");

setHMACKey takes the same input types as the constructor and getHMAC takes the same inputs as getHash as described above.

Note: You cannot calculate both the hash and HMAC using the same object.

Files

src/sha_dev.js

A commented implementation of the entire SHA family of hashes. Not to be used in production.

src/sha.js

A Google Closure Compiler optimized version of the entire library.

src/sha1.js

A Google Closure Compiler optimized version the library with non SHA-1 functionality removed.

src/sha256.js

A Google Closure Compiler optimized version the library with non SHA-224/SHA-256 functionality removed.

src/sha3.js

A Google Closure Compiler optimized version the library with non SHA-3 functionality removed.

src/sha512.js

A Google Closure Compiler optimized version the library with non SHA-384/SHA-512 functionality removed.

Compiling

This library makes use of the Google Closure Compiler to both boost performance and reduce filesizes. To compile sha_dev.js into a customized output file, use a command like the following:

java -jar compiler.jar --define="SUPPORTED_ALGS=<FLAG>" \
    --externs /path/to/build/externs.js --warning_level VERBOSE \
    --compilation_level ADVANCED_OPTIMIZATIONS \
    --js /path/to/sha_dev.js --js_output_file /path/to/sha.js

where FLAG is a bitwise OR of the following values:

• 8 for SHA3
• 4 for SHA-384/SHA-512
• 2 for SHA-224/256
• 1 for SHA-1

Contact Info

The project's website is located at https://caligatio.github.com/jsSHA/

Donations

Feel like donating? We're now accepting donations through Pledgie and Bitcoin!