sha512-wasm

sha512-wasm

Usage

const sha512 = require('sha512-wasm')

if (!Sha512.SUPPORTED) {
  console.log('WebAssembly not supported by your runtime')
}

var hash = sha512()
  .update('hello')
  .update(' ')
  .update(Buffer.from('world'))
  .digest('hex')

console.log('Sha512 hash of "hello world" is ', hash)
// 309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f

API

const hash = sha512()

Create a new hash instance.

hash.update(data, [enc])

Update the hash with a new piece of data. data may be passed as a buffer, uint8array or a string. If data is passed as a string, then it will be interpreted as a utf8 string unless enc specifies an encoding.

Supported encs are:

• utf8 / utf-8 (defualt)
• hex
• base64

hash.digest([enc])

Digest the hash. If enc is specified, then the digest shall be returned as an enc encoded string. Otherwise a buffer is returned.

Supported encs are:

• utf8 / utf-8 (defualt)
• hex
• base64

var promise = sha512.ready([cb])

Wait for the WASM code to load. Returns the WebAssembly instance promise as well for convenience. You have to call this at least once before instantiating the hash.

Contributing

The bulk of this module is implemented in WebAssembly in the sha512.wat file. The format of this file is S-Expressions that can be compiled to their binary WASM representation by doing

wat2wasm sha512.wat -o sha512.wasm

To build the thin Javascript wrapper for the WASM module use wat2js:

# also available as `npm run compile`
wat2js sha512.wat -o sha512.js

If you do not have wat2wasm installed follow the instructions here, https://github.com/WebAssembly/wabt

License

MIT