jwtAlgSetSym (Function)

jwtAlgSetSym configures the JWT object to use a symmetrical encryption.

Mainly for use with JWT objects created with jwtCreate.

To configure an asymmetrical encryption, see jwtAlgSetAsym.

Input:

jwt : SYSHANDLE

The JWT object to set the encryption algorithm for.

type : INT default 0

The kind of algorithm to use:

key: PTR

The key to use for encoding the token.

key_len : INT

The size of the key.

Returns: INT

Declaration:

FUNCTION jwtAlgSetSym : INT;
VAR_INPUT
   type    : INT;
   jwt     : SYSHANDLE;
   key     : PTR;
   key_len : INT;
END_VAR;

Example:

INCLUDE rtcu.inc
 
PROGRAM test;
VAR
   rc      : INT;
   jwt     : SYSHANDLE;
   key     : ARRAY[0..20] OF BYTE;
   key_len : INT;
END_VAR;
 
BEGIN
   ...
   // Prepare key
   key_len := strlen(str:="your-256-bit-secret");
   rc := strToMemory(dst:=ADDR(key), str:="your-256-bit-secret", len := key_len);
   // Set algorithm
   rc := jwtAlgSetSym(jwt:=jwt, type := 1, key := ADDR(key), key_len := key_len);
   ...
END;
 
END_PROGRAM;