com.wl4g.infra.common.crypto.asymmetric.AbstractAsymmetricCryptor Maven / Gradle / Ivy
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/*
* Copyright 2017 ~ 2025 the original author or authors. James Wong
*
* 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.wl4g.infra.common.crypto.asymmetric;
import static com.wl4g.infra.common.lang.Assert2.isTrue;
import static com.wl4g.infra.common.lang.Assert2.notNullOf;
import static com.wl4g.infra.common.log.SmartLoggerFactory.getLogger;
import static java.lang.String.format;
import static java.util.Objects.isNull;
import static javax.crypto.Cipher.DECRYPT_MODE;
import static javax.crypto.Cipher.ENCRYPT_MODE;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import com.wl4g.infra.common.codec.CodecSource;
import com.wl4g.infra.common.crypto.asymmetric.spec.KeyPairSpec;
import com.wl4g.infra.common.log.SmartLogger;
/**
* Fast Abstract asymmetric algorithm public implementation.
*
* @author wangl.sir
* @version v1.0 2019年1月21日
* @since
*/
abstract class AbstractAsymmetricCryptor implements AsymmetricCryptor {
final protected SmartLogger log = getLogger(getClass());
/**
* Specify the key factory of the algorithm instance.
*/
final protected KeyFactory keyFactory;
/** Asymmetric algorithm key bit size. */
final protected int keysize;
/**
* Secret key constructor
*
* @param keysize
*/
public AbstractAsymmetricCryptor(int keysize) {
isTrue(keysize > 0, "AsymmetricAlgorithmKeySize > 0 is requires");
this.keysize = keysize;
try {
keyFactory = KeyFactory.getInstance(getAlgorithmPrimary());
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
@Override
public int getKeysize() {
return keysize;
}
/**
* Generate keySpecPair
*
* @return
*/
@Override
final public KeyPairSpec generateKeyPair() {
try {
// Generate keyPair.
KeyPairGenerator kpg = KeyPairGenerator.getInstance(getAlgorithmPrimary());
kpg.initialize(getKeysize());
KeyPair keyPair = kpg.generateKeyPair();
// New create keySpec pair.
KeySpec pubKeySepc = keyFactory.getKeySpec(keyPair.getPublic(), getPublicKeySpecClass());
KeySpec privKeySepc = keyFactory.getKeySpec(keyPair.getPrivate(), getPrivateKeySpecClass());
return newKeySpec(getAlgorithmPrimary(), pubKeySepc, privKeySepc);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
/**
* De-serialization generate keyPair.
*
* @param publicKey
* @param privateKey
* @return
*/
@Override
final public KeyPairSpec generateKeyPair(byte[] publicKey, byte[] privateKey) {
try {
// Deserialization generate keyPair.
return newKeySpec(getAlgorithmPrimary(), generatePubKeySpec(publicKey), generateKeySpec(privateKey));
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
@Override
public KeySpec generatePubKeySpec(byte[] publicKey) {
notNullOf(publicKey, "publicKey");
try {
PublicKey _publicKey = keyFactory.generatePublic(new X509EncodedKeySpec(publicKey));
// Generate public KeySepc.
return keyFactory.getKeySpec(_publicKey, getPublicKeySpecClass());
} catch (InvalidKeySpecException e) {
throw new IllegalStateException(e);
}
}
@Override
public KeySpec generateKeySpec(byte[] privateKey) {
notNullOf(privateKey, "privateKey");
try {
// Generate private KeySepc.
PrivateKey _privateKey = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(privateKey));
return keyFactory.getKeySpec(_privateKey, getPrivateKeySpecClass());
} catch (InvalidKeySpecException e) {
throw new IllegalStateException(e);
}
}
@Override
public CodecSource encrypt(KeySpec keySpec, final CodecSource plainSource) {
notNullOf(keySpec, "keySpec");
if (isNull(plainSource))
return null;
try {
Cipher eCipher = Cipher.getInstance(getPadAlgorithm());
// Generate publicKey
PublicKey pubKey = keyFactory.generatePublic(keySpec);
eCipher.init(ENCRYPT_MODE, pubKey);
byte[] cipherArray = eCipher.doFinal(plainSource.getBytes());
return new CodecSource(cipherArray);
} catch (Exception e) {
throw new IllegalStateException(format("Failed to encryption plaintext of [%s]", plainSource), e);
}
}
@Override
public CodecSource decrypt(KeySpec keySpec, final CodecSource cipherSource) {
notNullOf(keySpec, "keySpec");
if (isNull(cipherSource))
return null;
try {
Cipher dCipher = Cipher.getInstance(getPadAlgorithm());
// Generate privateKey
PrivateKey key = keyFactory.generatePrivate(keySpec);
dCipher.init(DECRYPT_MODE, key);
byte[] plainArray = dCipher.doFinal(cipherSource.getBytes());
return new CodecSource(plainArray);
} catch (Exception e) {
throw new IllegalStateException(format("Failed to decryption hex ciphertext of [%s]", cipherSource.toHex()), e);
}
}
/**
* Get public key description of asymmetric algorithms
*
* @return
*/
protected abstract Class getPublicKeySpecClass();
/**
* Get private key description of asymmetric algorithms
*
* @return
*/
protected abstract Class getPrivateKeySpecClass();
/**
* New create keySpecEntity {@link KeySpec}
*
* @param algorithm
* @param pubKeySpec
* @param keySpec
* @return
*/
protected abstract KeyPairSpec newKeySpec(String algorithm, KeySpec pubKeySpec, KeySpec keySpec);
}