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Java library for Javascript Object Signing and Encryption (JOSE) and JSON Web Tokens (JWT)
There is a newer version: 10.0.1
package com.nimbusds.jose.crypto;


import java.util.*;

import com.nimbusds.jose.EncryptionMethod;
import com.nimbusds.jose.JWEAlgorithm;


/**
 * The base abstract class for AES encrypters and decrypters of {@link
 * com.nimbusds.jose.JWEObject JWE objects}.
 *
 * Supports the following JSON Web Algorithms (JWAs):
 *
 * 

 *      {@link com.nimbusds.jose.JWEAlgorithm#A128KW}
 *      
{@link com.nimbusds.jose.JWEAlgorithm#A192KW}
 *      
{@link com.nimbusds.jose.JWEAlgorithm#A256KW}
 *      
{@link com.nimbusds.jose.JWEAlgorithm#A128GCMKW}
 *      
{@link com.nimbusds.jose.JWEAlgorithm#A192GCMKW}
 *      
{@link com.nimbusds.jose.JWEAlgorithm#A256GCMKW}
 * 
 *
 * Supports the following encryption methods:
 *
 * 

 *     {@link com.nimbusds.jose.EncryptionMethod#A128CBC_HS256}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A192CBC_HS384}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A256CBC_HS512}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A128GCM}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A192GCM}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A256GCM}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A128CBC_HS256_DEPRECATED}
 *     
{@link com.nimbusds.jose.EncryptionMethod#A256CBC_HS512_DEPRECATED}
 * 
 *
 * @author Melisa Halsband
 * @version $version$ (2014-06-18)
 */
abstract class AESCryptoProvider extends BaseJWEProvider {


	/**
	 * The supported JWE algorithms.
	 */
	public static final Set SUPPORTED_ALGORITHMS;


	/**
	 * The supported encryption methods.
	 */
	public static final Set SUPPORTED_ENCRYPTION_METHODS;


	/**
	 * The JWE algorithms compatible with each key size.
	 */
	public static final Map> COMPATIBLE_ALGORITHMS;


	/**
	 * Initialises the supported algorithms and encryption methods.
	 */
	static {

		Set algs = new HashSet<>();
		algs.add(JWEAlgorithm.A128KW);
		algs.add(JWEAlgorithm.A192KW);
		algs.add(JWEAlgorithm.A256KW);
		algs.add(JWEAlgorithm.A128GCMKW);
		algs.add(JWEAlgorithm.A192GCMKW);
		algs.add(JWEAlgorithm.A256GCMKW);
		SUPPORTED_ALGORITHMS = Collections.unmodifiableSet(algs);

		Set methods = new HashSet<>();
		methods.add(EncryptionMethod.A128CBC_HS256);
		methods.add(EncryptionMethod.A192CBC_HS384);
		methods.add(EncryptionMethod.A256CBC_HS512);
		methods.add(EncryptionMethod.A128GCM);
		methods.add(EncryptionMethod.A192GCM);
		methods.add(EncryptionMethod.A256GCM);
		methods.add(EncryptionMethod.A128CBC_HS256_DEPRECATED);
		methods.add(EncryptionMethod.A256CBC_HS512_DEPRECATED);
		SUPPORTED_ENCRYPTION_METHODS = Collections.unmodifiableSet(methods);


		Map> algsMap = new HashMap<>();
		Set bit16Algs = new HashSet<>();
		Set bit24Algs = new HashSet<>();
		Set bit32Algs = new HashSet<>();
		bit16Algs.add(JWEAlgorithm.A128GCMKW);
		bit16Algs.add(JWEAlgorithm.A128KW);
		bit24Algs.add(JWEAlgorithm.A192GCMKW);
		bit24Algs.add(JWEAlgorithm.A192KW);
		bit32Algs.add(JWEAlgorithm.A256GCMKW);
		bit32Algs.add(JWEAlgorithm.A256KW);
		algsMap.put(16,Collections.unmodifiableSet(bit16Algs));
		algsMap.put(24,Collections.unmodifiableSet(bit24Algs));
		algsMap.put(32,Collections.unmodifiableSet(bit32Algs));
		COMPATIBLE_ALGORITHMS = Collections.unmodifiableMap(algsMap);
	}


	/**
	 * Creates a new AES encryption / decryption provider.
	 */
	protected AESCryptoProvider() {

		super(SUPPORTED_ALGORITHMS, SUPPORTED_ENCRYPTION_METHODS);
	}
}