org.aoju.bus.crypto.asymmetric.RSA Maven / Gradle / Ivy
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package org.aoju.bus.crypto.asymmetric;
import org.aoju.bus.core.instance.Instances;
import org.aoju.bus.core.lang.Algorithm;
import org.aoju.bus.core.lang.exception.InstrumentException;
import org.aoju.bus.crypto.Builder;
import org.aoju.bus.crypto.Holder;
import java.math.BigInteger;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.RSAKey;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
/**
*
* RSA公钥/私钥/签名加密解密
*
*
* 罗纳德·李维斯特(Ron [R]ivest)、阿迪·萨莫尔(Adi [S]hamir)和伦纳德·阿德曼(Leonard [A]dleman)
*
*
* 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，
* 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全
*
*
* @author Kimi Liu
* @version 6.1.1
* @since JDK 1.8+
*/
public class RSA extends Asymmetric {
/**
* 构造，生成新的私钥公钥对
*/
public RSA() {
super(Algorithm.RSA_ECB_PKCS1);
}
/**
* 构造，生成新的私钥公钥对
*
* @param rsaAlgorithm 自定义RSA算法，例如RSA/ECB/PKCS1Padding
*/
public RSA(String rsaAlgorithm) {
super(rsaAlgorithm);
}
/**
* 构造
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKeyStr 私钥Hex或Base64表示
* @param publicKeyStr 公钥Hex或Base64表示
*/
public RSA(String privateKeyStr, String publicKeyStr) {
super(Algorithm.RSA_ECB_PKCS1, privateKeyStr, publicKeyStr);
}
/**
* 构造
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param rsaAlgorithm 自定义RSA算法，例如RSA/ECB/PKCS1Padding
* @param privateKeyStr 私钥Hex或Base64表示
* @param publicKeyStr 公钥Hex或Base64表示
*/
public RSA(String rsaAlgorithm, String privateKeyStr, String publicKeyStr) {
super(rsaAlgorithm, privateKeyStr, publicKeyStr);
}
/**
* 构造
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKey 私钥
* @param publicKey 公钥
*/
public RSA(byte[] privateKey, byte[] publicKey) {
super(Algorithm.RSA_ECB_PKCS1, privateKey, publicKey);
}
/**
* 构造
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param modulus N特征值
* @param privateExponent d特征值
* @param publicExponent e特征值
*/
public RSA(BigInteger modulus, BigInteger privateExponent, BigInteger publicExponent) {
this(generatePrivateKey(modulus, privateExponent), generatePublicKey(modulus, publicExponent));
}
/**
* 构造
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param privateKey 私钥
* @param publicKey 公钥
*/
public RSA(PrivateKey privateKey, PublicKey publicKey) {
super(Algorithm.RSA_ECB_PKCS1, privateKey, publicKey);
}
/**
* 构造
* 私钥和公钥同时为空时生成一对新的私钥和公钥
* 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
*
* @param rsaAlgorithm 自定义RSA算法，例如RSA/ECB/PKCS1Padding
* @param privateKey 私钥
* @param publicKey 公钥
*/
public RSA(String rsaAlgorithm, PrivateKey privateKey, PublicKey publicKey) {
super(rsaAlgorithm, privateKey, publicKey);
}
/**
* 生成RSA私钥
*
* @param modulus N特征值
* @param privateExponent d特征值
* @return {@link PrivateKey}
*/
public static PrivateKey generatePrivateKey(BigInteger modulus, BigInteger privateExponent) {
return Builder.generatePrivateKey(Algorithm.RSA_ECB_PKCS1, new RSAPrivateKeySpec(modulus, privateExponent));
}
/**
* 生成RSA公钥
*
* @param modulus N特征值
* @param publicExponent e特征值
* @return {@link PublicKey}
*/
public static PublicKey generatePublicKey(BigInteger modulus, BigInteger publicExponent) {
return Builder.generatePublicKey(Algorithm.RSA_ECB_PKCS1, new RSAPublicKeySpec(modulus, publicExponent));
}
@Override
public byte[] encrypt(byte[] data, KeyType keyType) {
// 在非使用BC库情况下，blockSize使用默认的算法
if (this.encryptBlockSize < 0 && null == Instances.singletion(Holder.class).getProvider()) {
// 加密数据长度 <= 模长-11
this.encryptBlockSize = ((RSAKey) getKeyByType(keyType)).getModulus().bitLength() / 8 - 11;
}
return super.encrypt(data, keyType);
}
@Override
public byte[] decrypt(byte[] bytes, KeyType keyType) {
// 在非使用BC库情况下，blockSize使用默认的算法
if (this.decryptBlockSize < 0 && null == Instances.singletion(Holder.class).getProvider()) {
// 加密数据长度 <= 模长-11
this.decryptBlockSize = ((RSAKey) getKeyByType(keyType)).getModulus().bitLength() / 8;
}
return super.decrypt(bytes, keyType);
}
@Override
protected void initCipher() {
try {
super.initCipher();
} catch (InstrumentException e) {
final Throwable cause = e.getCause();
if (cause instanceof NoSuchAlgorithmException) {
// 在Linux下，未引入BC库可能会导致RSA/ECB/PKCS1Padding算法无法找到，此时使用默认算法
this.algorithm = Algorithm.RSA;
super.initCipher();
}
throw e;
}
}
}