org.tsugi.lti13

Class LTI13Util

java.lang.Object

org.tsugi.lti13.LTI13Util

public class LTI13Util
extends Object

Constructor Summary

Constructors

Constructor and Description
LTI13Util()

Method Summary

Modifier and Type	Method and Description
static String	breakKeyIntoLines(String rawkey)
static boolean	checkLTI11Transition(LaunchJWT lj, String key, String secret) Check the OAuth signature for an LTI 1.3 Launch JWT See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim
static String	compute_HMAC_SHA256(String message, String secret) Compute the HMAC256 of a string (part of LTI 1.1 Transition) See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim Based on: https://www.jokecamp.com/blog/examples-of-creating-base64-hashes-using-hmac-sha256-in-different-languages/#php https://stackoverflow.com/questions/7124735/hmac-sha256-algorithm-for-signature-calculation
static KeyPair	generateKeyPair()
static Map<String,String>	generateKeys()
static String	getLTI11TransitionBase(LaunchJWT lj) Compute the base string for a Launch JWT See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim
static String	getPrivateEncoded(Key key)
static String	getPrivateEncoded(KeyPair kp)
static String	getPublicEncoded(Key key)
static String	getPublicEncoded(KeyPair kp)
static void	return400(javax.servlet.http.HttpServletResponse response, String error)
static void	return400(javax.servlet.http.HttpServletResponse response, String error, String detail)
static String	sha256(String input)
static String	signLTI11Transition(LaunchJWT lj, String secret) Compute the OAuth signature for an LTI 1.3 Launch JWT See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim
static Key	string2PrivateKey(String keyString)
static Key	string2PublicKey(String keyString)
static String	stripPKCS8(String input)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LTI13Util

public LTI13Util()

Method Detail

generateKeys

public static Map<String,String> generateKeys()
                                       throws NoSuchAlgorithmException

Throws:

NoSuchAlgorithmException

stripPKCS8

public static String stripPKCS8(String input)

generateKeyPair

public static KeyPair generateKeyPair()

getPublicEncoded

public static String getPublicEncoded(KeyPair kp)

getPublicEncoded

public static String getPublicEncoded(Key key)

getPrivateEncoded

public static String getPrivateEncoded(KeyPair kp)

getPrivateEncoded

public static String getPrivateEncoded(Key key)

breakKeyIntoLines

public static String breakKeyIntoLines(String rawkey)

string2PrivateKey

public static Key string2PrivateKey(String keyString)

string2PublicKey

public static Key string2PublicKey(String keyString)

getLTI11TransitionBase

public static String getLTI11TransitionBase(LaunchJWT lj)

Compute the base string for a Launch JWT See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim

Parameters:

lj - The Launch JSON Web Token with the LTI 1.1 transition data

Returns:

string This is null if the base string cannot be computed

signLTI11Transition

public static String signLTI11Transition(LaunchJWT lj,
                                         String secret)

Compute the OAuth signature for an LTI 1.3 Launch JWT See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim

Parameters:

lj - The Launch JSON Web Token with the LTI 11 transition data

secret - The OAuth secret

Returns:

string This is null if the signature cannot be computed

checkLTI11Transition

public static boolean checkLTI11Transition(LaunchJWT lj,
                                           String key,
                                           String secret)

Check the OAuth signature for an LTI 1.3 Launch JWT See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim

Parameters:

lj - The Launch JSON Web Token with the LTI 11 transition data

key - The OAuth key

secret - The OAuth secret

Returns:

true if the signature matches, false if the JWT the signature does not match or the JWT data is malformed.

sha256

public static String sha256(String input)

compute_HMAC_SHA256

public static String compute_HMAC_SHA256(String message,
                                         String secret)

Compute the HMAC256 of a string (part of LTI 1.1 Transition) See: https://www.imsglobal.org/spec/lti/v1p3/migr#lti-1-1-migration-claim Based on: https://www.jokecamp.com/blog/examples-of-creating-base64-hashes-using-hmac-sha256-in-different-languages/#php https://stackoverflow.com/questions/7124735/hmac-sha256-algorithm-for-signature-calculation

Parameters:

object - $message The message to sign

string - $secret The secret used to sign the message

Returns:

string The signed message

return400

public static void return400(javax.servlet.http.HttpServletResponse response,
                             String error,
                             String detail)

return400

public static void return400(javax.servlet.http.HttpServletResponse response,
                             String error)