mod_lti\local\ltiopenid\jwks_helper Class Reference

This class exposes functions for LTI 1.3 Key Management. More...

Static Public Member Functions
static	fix_jwks_alg (array $jwks, string $jwt)
	Take an array of JWKS keys and infer the 'alg' property for a single key, if missing, based on an input JWT.
static	get_jwks ()
	Returns the JWK Key Set for this site.
static	get_private_key ()
	Returns the private key to use to sign outgoing JWT.

Detailed Description

This class exposes functions for LTI 1.3 Key Management.

Copyright

2020 Claude Vervoort (Cengage)

License

http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Member Function Documentation

fix_jwks_alg()

static mod_lti\local\ltiopenid\jwks_helper::fix_jwks_alg ( array $jwks, string $jwt )

static

Take an array of JWKS keys and infer the 'alg' property for a single key, if missing, based on an input JWT.

This only sets the 'alg' property for a single key when all the following conditions are met:

• The key's 'kid' matches the 'kid' provided in the JWT's header.
• The key's 'alg' is missing.
• The JWT's header 'alg' matches the algorithm family of the key (the key's kty).
• The JWT's header 'alg' matches one of the approved LTI asymmetric algorithms.

Keys not matching the above are left unchanged.

Parameters

array	$jwks	the keyset array.
string	$jwt	the JWT string.

Return values

array

the fixed keyset array.

get_jwks()

static mod_lti\local\ltiopenid\jwks_helper::get_jwks ( )

static

Returns the JWK Key Set for this site.

Return values

array

keyset exposting the site public key.

get_private_key()

static mod_lti\local\ltiopenid\jwks_helper::get_private_key ( )

static

Returns the private key to use to sign outgoing JWT.

Return values

array

keys are kid and key in PEM format.

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The documentation for this class was generated from the following file:

• mod/lti/classes/local/ltiopenid/jwks_helper.php