jsSHA is a complelely free, open source, cross-browser and web-based software written in JavaScript and designed to implement the entire family of SHA hashes, including SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512.

When using the jsSHA script, you should be aware of the fact that it is also capable of implementing the SHA-512 and SHA-384 hashes, even if JavaScript doesn’t support 64-bit operations natively.

It also implements HMAC (keyed-Hash Message Authentication Code). Secure Hash Algorithm is defined by FIPS PUB 180-2 and FIPS PUB 198-1 in the following documents http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf / http://csrc.nist.gov/publications/fips/fips198-1/FIPS-198-1_final.pdf.

In order to use jsSHA, you will need to include the desired JavaScript file (sha.js, sha1.js, sha256.js or sha512.js) in your header, e.g., < script type="text/javascript" src="/path/to/sha.js" >. Add a new jsSHA object with your string to be hashed and its format (HEX or TEXT) as the parameters.

Then, you will have to call the function using the hashed string and the algorithm. For example, you should use the var hash = hex_sha("This is a Test", "SHA-512"); code to achieve that. More details and examples are found on the project’s website.

The jsSHA software makes use of the Google Closure Compiler to reduce filesizes, as well as to boost performance. If you want to compile the sha_dev.js script into a customized output file, you must use the ‘java -jar compiler.jar --define="SUPPORTED_ALGS=" --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’ command, where FLAG can be one of the following values (1 for SHA-1, 4 for SHA-384/SHA-512, 2 for SHA-224/256) or bitwise.