This function generates a JWT token (JSON Web Token) (according to RFC 7519).

The generated token is signed either with a certificate (parameter c) or an HMAC (parameter d).

JWT tokens consist of two JSON parts (header and payload). Both are passed to the function in a map (parameter b). See example.

As a result, the function returns the signed JWT token (with the three components header, payload and signature), encoded in Base64.

Parameters

Parameter	Description
a	The JWT algorithm to be used ( HS256 , HS384 , HS512 , RS256 , RS384 , RS512 , ES256 , ES384 , ES512 , PS256 , PS384 , PS512 ) . Note: Use the three dots to select a value.
b	The name of the map with the JSON elements (header, payload). See example.
c	ID of the local certificate (for JWT algorithms RSx, ESx, PSx in parameter a).
d	Shared secret key (freely selectable) for HMAC signature (for JWT algorithms HSx in parameter a ).

Example

First we fill the map mymap with the following entries. See function add to map(). Please note the special structure of the header key.

Key	Value
@JWTHEADER_kid	313476155373880299762899997753309067120
sub	1234567890
name	John Doe
iat	1516239022

Now we use the function with the following parameters.

Parameter	Value
a	HS256
b	mymap
c
d	mysharedsecretkey

This internally creates the following JWT structure.

Header: {"kid":"313476155373880299762899997753309067120","alg":"HS256","typ":"JWT"} Payload: {"sub":"1234567890","name":"John Doe","iat":1516239022}

You can now check the validity of the generated JWT token (signed and Base64-encoded) with the function check JWT(). To do this, use the shared secret key from parameter d.