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OAuth 2.0 SDK with OpenID Connection extensions for developing client and server applications.

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/*
 * oauth2-oidc-sdk
 *
 * Copyright 2012-2016, Connect2id Ltd and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the
 * License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

package com.nimbusds.oauth2.sdk.pkce;


import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import com.nimbusds.jose.util.Base64URL;
import com.nimbusds.oauth2.sdk.ParseException;
import com.nimbusds.oauth2.sdk.id.Identifier;


/**
 * Authorisation code challenge.
 *
 * 

Related specifications: * *

    *
  • Proof Key for Code Exchange by OAuth Public Clients (RFC 7636). *
*/ public class CodeChallenge extends Identifier { /** * Creates a new code challenge with the specified value. * * @param value The code challenge value. Must not be {@code null} or * empty string. */ private CodeChallenge(final String value) { super(value); } /** * Computes the code challenge using the specified method and verifier. * * @param method The code challenge method. Must be supported and * not {@code null}. * @param codeVerifier The code verifier. Must not be {@code null}. * * @return The computed code challenge. */ public static CodeChallenge compute(final CodeChallengeMethod method, final CodeVerifier codeVerifier) { if (CodeChallengeMethod.PLAIN.equals(method)) { return new CodeChallenge(codeVerifier.getValue()); } if (CodeChallengeMethod.S256.equals(method)) { MessageDigest md; try { md = MessageDigest.getInstance("SHA-256"); } catch (NoSuchAlgorithmException e) { throw new IllegalStateException(e.getMessage()); } byte[] hash = md.digest(codeVerifier.getValueBytes()); return new CodeChallenge(Base64URL.encode(hash).toString()); } throw new IllegalArgumentException("Unsupported code challenge method: " + method); } /** * Parses a code challenge from the specified string. * * @param value The code challenge value. * * @return The code challenge. */ public static CodeChallenge parse(final String value) throws ParseException { try { return new CodeChallenge(value); } catch (IllegalArgumentException e) { throw new ParseException("Invalid code challenge: " + e.getMessage(), e); } } }




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