@phc/format

phc-format

📝 PHC string format serializer/deserializer
_{Coded with ❤️ by Simone Primarosa.}

Motivation

The PHC String Format is an attempt to specify a common hash string format that’s a restricted & well defined subset of the Modular Crypt Format. New hashes are strongly encouraged to adhere to the PHC specification, rather than the much looser Modular Crypt Format.

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Install

npm install --save @phc/format

Usage

const phc = require('@phc/format');

const phcobj = {
  id: 'pbkdf2-sha256',
  params: {i: 6400},
  salt: Buffer.from('0ZrzXitFSGltTQnBWOsdAw', 'base64'),
  hash: Buffer.from('Y11AchqV4b0sUisdZd0Xr97KWoymNE0LNNrnEgY4H9M', 'base64'),
};

const phcstr = "$pbkdf2-sha256$i=6400$0ZrzXitFSGltTQnBWOsdAw$Y11AchqV4b0sUisdZd0Xr97KWoymNE0LNNrnEgY4H9M";

phc.serialize(phcobj);
// => phcstr

phc.deserialize(phcstr);
// => phcobj

Using the raw and strict parameters you can even serialize/deserialize PHC strings that does not strictly adhere to the 'standard', like the one used by argon2

const phc = require('@phc/format');

const phcobj = {
  id: 'argon2i',
  raw: 'v=19', ← Note the v parameter
  params: {
    m: 120,
    t: 5000,
    p: 2
  },
  salt: Buffer.from('iHSDPHzUhPzK7rCcJgOFfg', 'base64'),
  hash: Buffer.from('J4moa2MM0/6uf3HbY2Tf5Fux8JIBTwIhmhxGRbsY14qhTltQt+Vw3b7tcJNEbk8ium8AQfZeD4tabCnNqfkD1g', 'base64'),
};
                         ↓ Note the v parameter
const phcstr = "$argon2i$v=19$m=120,t=5000,p=2$iHSDPHzUhPzK7rCcJgOFfg$J4moa2MM0/6uf3HbY2Tf5Fux8JIBTwIhmhxGRbsY14qhTltQt+Vw3b7tcJNEbk8ium8AQfZeD4tabCnNqfkD1g";

phc.serialize(phcobj);
// => phcstr

phc.deserialize(phcstr);
// => throws an error since there are more than 4 fields (a field is one $)

phc.deserialize(phcstr, false);
// => phcobj

With the same philosophy you can even serialize/deserialize MCF formatted strings.

const phc = require('@phc/format');

const phcobj = {
  id: 'pbkdf2-sha256',
  raw: '6400',
  salt: Buffer.from('0ZrzXitFSGltTQnBWOsdAw', 'base64'),
  hash: Buffer.from('Y11AchqV4b0sUisdZd0Xr97KWoymNE0LNNrnEgY4H9M', 'base64'),
};

const phcstr = "$pbkdf2-sha256$6400$0ZrzXitFSGltTQnBWOsdAw$Y11AchqV4b0sUisdZd0Xr97KWoymNE0LNNrnEgY4H9M";

phc.serialize(phcobj);
// => phcstr

phc.deserialize(phcstr);
// => throws an error since the second field (a field is one $) is not a valid
// params string

phc.deserialize(phcstr, false);
// => phcobj

API

TOC

serialize(opts) ⇒ string

Generates a PHC string using the data provided.

deserialize(phcstr, [strict]) ⇒ Object

Parses data from a PHC string.

serialize(opts) ⇒ string

Generates a PHC string using the data provided.

Kind: global function
Returns: string - The hash string adhering to the PHC format.

Param	Type	Description
opts	Object	Object that holds the data needed to generate the PHC string.
opts.id	string	Symbolic name for the function.
[opts.raw]	string	Additional raw data added after the identifier. It's here to support argon2 v parameter and to generate MCF formatted strings.
[opts.params]	Object	Parameters of the function.
[opts.salt]	Buffer	The salt as a binary buffer.
[opts.hash]	Buffer	The hash as a binary buffer.

deserialize(phcstr, [strict]) ⇒ Object

Parses data from a PHC string.

Kind: global function
Returns: Object - The object containing the data parsed from the PHC string.

Param	Type	Default	Description
phcstr	string		A PHC string to parse.
[strict]	boolean	true	If false does not throw an error if there is one filed not unrecognized. The content of the unrecognized filed will be stored in the raw property of the output object. This is useful to parse out of specs parameters like the 'v' present in the argon2 hash format or to parse MCF formatted strings.

Contributing

Contributions are REALLY welcome and if you find a security flaw in this code, PLEASE report it.
Please check the contributing guidelines for more details. Thanks!

Authors

• Simone Primarosa - Follow me on Github (:octocat:@simonepri) and on Twitter (🐦@simonepri)

See also the list of contributors who participated in this project.

License

This project is licensed under the MIT License - see the license file for details.