fib-jws

An implementation of JSON Web Signatures.

Install

$ npm install fib-jws

Usage

jws.ALGORITHMS

Array of supported algorithms. The following algorithms are currently supported.

alg Parameter Value	Digital Signature or MAC Algorithm
HS256	HMAC using SHA-256 hash algorithm
HS384	HMAC using SHA-384 hash algorithm
HS512	HMAC using SHA-512 hash algorithm
HSM3	HMAC using SM3 hash algorithm
RS256	RSASSA using SHA-256 hash algorithm
RS384	RSASSA using SHA-384 hash algorithm
RS512	RSASSA using SHA-512 hash algorithm
ES256	ECDSA using P-256 curve and SHA-256 hash algorithm
ES384	ECDSA using P-384 curve and SHA-384 hash algorithm
ES512	ECDSA using P-521 curve and SHA-512 hash algorithm
ES256K	ECDSA using secp256k1 curve and SHA-256 hash algorithm
SM2SM3	using SM2 curve and SM3 hash algorithm
EdDSA	EdDSA using Ed25519 curve
none	No digital signature or MAC value included

jws.sign(header, payload, key)

Return a JSON Web Signature for a header and a payload.

Arguments:

• header
• payload
• key

header must be an object with an alg property. header.alg must be one a value found in jws.ALGORITHMS. See above for a table of supported algorithms.

If payload will be coerced into a string using JSON.stringify.

key is a buffer containing either the secret for HMAC algorithms, or the PEM encoded private key for RSA and ECDSA, or the json format private key, or a PKey object.

Example

const signature = jws.sign(
  // header
  { alg: 'HS256' },
  // payload
  { id: 12345, name: "Frank" },
  // secret
  '98DE76B1',
);

jws.verify(signature, key, acceptAlgs)

Returnstrue or false for whether a signature matches a secret or key.

signature is a JWS Signature. header.alg must be a value found in jws.ALGORITHMS. See above for a table of supported algorithms. key is a buffer containing either the secret for HMAC algorithms, or the PEM encoded public key for RSA and ECDSA, or the json format public key, or a PKey object.

acceptAlgs is a list of what algorithms are accepted.

jws.decode(signature)

Returns the decoded header, decoded payload, and signature parts of the JWS Signature.

Returns an object with three properties, e.g.

{
  header: { alg: 'HS256' },
  payload: { id: 12345, name: "Frank" }
}