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Trimble Identity OAuth Client library holds the client classes that are used for communicating with Trimble Identity Service

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package com.trimble.id;

import static com.trimble.id.AuthenticationConstants.CODE_CHALLENGE_SIZE;
import static com.trimble.id.AuthenticationConstants.NO_SUCH_ALG_EXCEPTION;
import static com.trimble.id.AuthenticationConstants.STATE_SIZE;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;

public class CryptographicHelper {

	private static final Base64.Encoder BASE64 = Base64.getUrlEncoder().withoutPadding();
	private static final MessageDigest MESSAGE_DIGEST;
	private static final String SHA_256 = "SHA-256";

	static {
		try {
			MESSAGE_DIGEST = MessageDigest.getInstance(SHA_256);
		} catch (NoSuchAlgorithmException e) {
			throw new SDKClientException(new NoSuchAlgorithmException(NO_SUCH_ALG_EXCEPTION));
		}
	}

	public static byte[] generateRandomBytes(int size) {
		byte[] randomBytes = new byte[size];
		new SecureRandom().nextBytes(randomBytes);
		return randomBytes;
	}

	public static String toBase64AndUrlEncode(byte[] bytes) {
		byte[] base64UrlEncodedBytes = BASE64.encode(bytes);
		return new String(base64UrlEncodedBytes);
	}

	public static byte[] hash(String input) {
		return MESSAGE_DIGEST.digest(input.getBytes());
	}

	public static String generateCodeVerifier() {
		byte[] randomBytes = generateRandomBytes(CODE_CHALLENGE_SIZE);
		return toBase64AndUrlEncode(randomBytes);

	}

	public static String createCodeChallenge(String codeVerifier) {
		byte[] hashedBytes = hash(codeVerifier);
		return toBase64AndUrlEncode(hashedBytes);
	}

	public static String generateState() {
		byte[] randomBytes = generateRandomBytes(STATE_SIZE);
		return toBase64AndUrlEncode(randomBytes);

	}
}