chapi

What is it?

Chapi provides a compatible API for different hashing algorithms.

API

Chapi provides two ways of accessing hashing functions, you can use it as a function, or an object.

The function signature looks like this:

function(algorithm, options);

The other way of using it, is accessing the property name of the algorithm you would like to use, that property is a function which you can pass an optional configuration object to. Like this:

chapi.bcrypt()

---

Each hashing API provides 2 functions, being hash and compare.

hash(str, callback)

The hash function takes a string, and a callback. It performs the actually computation of the hash of str and stores any needed information in the hash you get back.

The signature of the callback you pass should be function(err, hash)

compare(str, hash, callback)

The compare function takes a string, a hash, and a callback. It calculates the hash of str (using the options from hash, if necessary) and compares it to hash.

The signature of the callback you pass should be function(err, match)

Example

Hashing

 
var chapi = require("chapi");
var async = require("async");
 
var algorithms = [ "bcrypt", "pbkdf2", "scrypt", "sha256" ];
 
var data = "hello world! so original.";
 
// Iterate over each algorithm in array
async.map(algorithms, function(algorithm, done) {
  // Call the `hash` function and pass in data & callback
  chapi[algorithm]().hash(data, done);
}, function(err, hashes) {
  
  // Check for errors..
  if(err) {
    return console.error("Error hashing:", err);
  }
 
  console.log("Hashes:", hashes);
 
  // Hashes contains the uniquely hashed string using each algorithm.
  
});
 

Verification

var chapi = require("chapi");
 
var plaintext = "omg not something random words";
var algorithm = "bcrypt";
 
chapi[algorithm].hash(plaintext, function(err, hash) {
 
  if(err) return console.error("Error hashing:", err);
 
  chapi[algorithm].compare(plaintext, hash, function(err, match) {
    
    if(err) return console.error("Error verifying:", err);
 
    console.log("Hash matched:", match);
 
  });
 
});

License

See LICENSE.md