org.jose4j.jwe.AesKeyWrapManagementAlgorithm Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jose4j Show documentation

The jose.4.j library is a robust and easy to use open source implementation of JSON Web Token (JWT) and the JOSE specification suite (JWS, JWE, and JWK). It is written in Java and relies solely on the JCA APIs for cryptography. Please see https://bitbucket.org/b_c/jose4j/wiki/Home for more info, examples, etc..

There is a newer version: 0.9.6

Show newest version

/*
 * Copyright 2012-2017 Brian Campbell
 *
 * 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 org.jose4j.jwe;

import org.jose4j.jwa.AlgorithmAvailability;
import org.jose4j.jwk.OctetSequenceJsonWebKey;
import org.jose4j.jwx.KeyValidationSupport;
import org.jose4j.keys.KeyPersuasion;
import org.jose4j.lang.InvalidKeyException;

import java.security.Key;

/**
 */
public class AesKeyWrapManagementAlgorithm extends WrappingKeyManagementAlgorithm
{
    int keyByteLength;

    public AesKeyWrapManagementAlgorithm(String alg, int keyByteLength)
    {
        super("AESWrap", alg);
        setKeyType(OctetSequenceJsonWebKey.KEY_TYPE);
        setKeyPersuasion(KeyPersuasion.SYMMETRIC);
        this.keyByteLength = keyByteLength;
    }

    int getKeyByteLength()
    {
        return keyByteLength;
    }

    @Override
    public void validateEncryptionKey(Key managementKey, ContentEncryptionAlgorithm contentEncryptionAlg) throws InvalidKeyException
    {
        validateKey(managementKey);
    }

    @Override
    public void validateDecryptionKey(Key managementKey, ContentEncryptionAlgorithm contentEncryptionAlg) throws InvalidKeyException
    {
        validateKey(managementKey);
    }

    void validateKey(Key managementKey) throws InvalidKeyException
    {
        KeyValidationSupport.validateAesWrappingKey(managementKey, getAlgorithmIdentifier(), getKeyByteLength());
    }

    @Override
    public boolean isAvailable()
    {
        int aesByteKeyLength = getKeyByteLength();
        String agl = getJavaAlgorithm();
        return AlgorithmAvailability.isAvailable("Cipher", agl) && CipherStrengthSupport.isAvailable(agl, aesByteKeyLength);
    }

    AesKeyWrapManagementAlgorithm setUseGeneralProviderContext()
    {
        this.useSuppliedKeyProviderContext = false;
        return this;
    }

    public static class Aes128 extends AesKeyWrapManagementAlgorithm
    {
        public Aes128()
        {
            super(KeyManagementAlgorithmIdentifiers.A128KW, 16);
        }
    }

    public static class Aes192 extends AesKeyWrapManagementAlgorithm
    {
        public Aes192()
        {
            super(KeyManagementAlgorithmIdentifiers.A192KW, 24);
        }
    }

    public static class Aes256 extends AesKeyWrapManagementAlgorithm
    {
        public Aes256()
        {
            super(KeyManagementAlgorithmIdentifiers.A256KW, 32);
        }
    }
}