Java加解密之RSA
RSA加解密需要有公钥，私钥；可以使用公钥加密，私钥解密；也可以使用私钥加密，公钥解密。私钥加密相同的数据密文相同，公钥加密相同的数据密文不同。
import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
/***
* 进行RSA加密解密
*/
public class SecrteKeyUtil {
private static Logger logger = LoggerFactory.getLogger(SecrteKeyUtil.class);
public static final String PUBLIC_KEY = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhK5CC/0MQqdG9xtMhGP0Cy8qkRw/UK7ktS9cN46V4wsDX5KvlTXyIYDXjiYwKvGVUak2OKZB688Qlz3RRy1E4UNosf8YREGwdNXE5wvG0bf1Qd5RCr/Cr99M3x/Elyp1Z+jFZlFXrbAAQZq/sRh+9l+xn3l8+ChhuTdXKBhpl+8cz4edmGHPWkOuGvoN6lOE8lNzbZtmz5dfbAEtbsOin+/u69ynoIGz4iYL7KnzDrZOOHutZ4++qtiX+Pbhse+h2tPAwgUSOOTKsoEn/zjadOS6XJJ1VeeWnBVSn40jPbYRt3ymApItQcym6mWSnyg+2flLnpdAf7DIQn2Qlqt+VwIDAQAB";
public static final String PRIVATE_KEY = "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";
public static final String SIGN_NAME = "RSA"; // aes rsa
/**
* 生成公钥与私钥对
*
* @return 公钥Key=publicKey 私钥Key=privateKey
* @throws Exception
*/
public static Map<String, String> getKeys() throws Exception {
int len = 2048;//rsa算法长度,生成秘钥对时用
// 获得公钥与私钥对
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(SIGN_NAME);
keyPairGen.initialize(len);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, String> keys = new HashMap<>(2);
String privateKey = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
keys.put("privateKey", privateKey);
RSAPublicKey rsapublicKey = (RSAPublicKey) keyPair.getPublic();
String publicKey = Base64.encodeBase64String(rsapublicKey.getEncoded());
keys.put("publicKey", publicKey);
return keys;
}
/**
* 从字符串中加载公钥
*
* @param publicKeyStr 公钥数据字符串
* @throws Exception 加载公钥时产生的异常
*/
public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr) throws Exception {
try {
byte[] buffer = Base64.decodeBase64(publicKeyStr);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance(SIGN_NAME);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
logger.error("无此算法",e);
throw new Exception("无此算法");
} catch (InvalidKeySpecException e) {
logger.error("公钥非法",e);
throw new Exception("公钥非法");
} catch (NullPointerException e) {
logger.error("公钥数据为空",e);
throw new Exception("公钥数据为空");
}
}
/**
* 从字符串中加载私钥
* @param privateKeyStr
* @return
* @throws Exception
*/
public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr) throws Exception {
try {
byte[] buffer = Base64.decodeBase64(privateKeyStr);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance(SIGN_NAME);
return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
logger.error("无此算法",e);
throw new Exception("无此算法");
} catch (InvalidKeySpecException e) {
logger.error("私钥非法",e);
throw new Exception("私钥非法");
} catch (NullPointerException e) {
logger.error("私钥数据为空",e);
throw new Exception("私钥数据为空");
}
}
/**
* 公钥加密过程
*
* @param publicKey 公钥
* @param plainTextData 明文数据
* @return
* @throws Exception 加密过程中的异常信息
*/
public static String encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception {
if (publicKey == null) {
throw new Exception("加密公钥为空, 请设置");
}
Cipher cipher = null;
try {
cipher = Cipher.getInstance(SIGN_NAME);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(plainTextData);
return Base64.encodeBase64String(output);
} catch (NoSuchAlgorithmException e) {
logger.error("无此加密算法",e);
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException",e);
return null;
} catch (InvalidKeyException e) {
logger.error("加密公钥非法,请检查",e);
throw new Exception("加密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
logger.error("明文长度非法",e);
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
logger.error("明文数据已损坏",e);
throw new Exception("明文数据已损坏");
}
}
/**
* 私钥加密过程
*
* @param privateKey 私钥
* @param plainTextData 明文数据
* @return
* @throws Exception 加密过程中的异常信息
*/
public static String encrypt(RSAPrivateKey privateKey, byte[] plainTextData) throws Exception {
if (privateKey == null) {
throw new Exception("加密私钥为空, 请设置");
}
Cipher cipher = null;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(plainTextData);
return Base64.encodeBase64String(output);
} catch (NoSuchAlgorithmException e) {
logger.error("无此加密算法",e);
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException",e);
return null;
} catch (InvalidKeyException e) {
logger.error("加密私钥非法,请检查",e);
throw new Exception("加密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
logger.error("明文长度非法",e);
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
logger.error("明文长度非法",e);
throw new Exception("明文数据已损坏");
}
}
/**
* 私钥解密过程
*
* @param privateKey 私钥
* @param cipherData 密文数据
* @return 明文
* @throws Exception 解密过程中的异常信息
*/
public static String decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception {
if (privateKey == null) {
throw new Exception("解密私钥为空, 请设置");
}
Cipher cipher = null;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(cipherData);
return new String(output);
} catch (NoSuchAlgorithmException e) {
logger.error("无此解密算法",e);
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException",e);
return null;
} catch (InvalidKeyException e) {
logger.error("解密私钥非法,请检查",e);
throw new Exception("解密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
logger.error("密文长度非法",e);
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
logger.error("密文数据已损坏",e);
throw new Exception("密文数据已损坏");
}
}
/**
* 公钥解密过程
*
* @param publicKey 公钥
* @param cipherData 密文数据
* @return 明文
* @throws Exception 解密过程中的异常信息
*/
public static String decrypt(RSAPublicKey publicKey, byte[] cipherData) throws Exception {
if (publicKey == null) {
throw new Exception("解密公钥为空, 请设置");
}
Cipher cipher = null;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(cipherData);
return new String(output);
} catch (NoSuchAlgorithmException e) {
logger.error("无此解密算法",e);
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException",e);
return null;
} catch (InvalidKeyException e) {
logger.error("解密公钥非法,请检查",e);
throw new Exception("解密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
logger.error("密文长度非法",e);
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
logger.error("密文数据已损坏",e);
throw new Exception("密文数据已损坏");
}
}
/**
* 私钥加密
* @param content 明文
* @return
*/
public static String priEncrypt(String content){
String res = "";
try {
//加载私钥
RSAPrivateKey rsaprikey = loadPrivateKeyByStr(PRIVATE_KEY);
//私钥加密
res = encrypt(rsaprikey,content.getBytes());
} catch (Exception e) {
logger.error("私钥加密出错",e);
}
return res;
}
/**
* 公钥加密
* @param content 明文
* @return
*/
public static String pubEncrypt(String content){
String res = "";
try {
//加载公钥
RSAPublicKey rsapubkey = loadPublicKeyByStr(PUBLIC_KEY);
//公钥加密
res = encrypt(rsapubkey,content.getBytes());
} catch (Exception e) {
logger.error("公钥加密出错",e);
}
return res;
}
/**
* 私钥解密
* @param content 加密后的密文
*/
public static String priDecrypt(String content){
String res = "";
try {
//加载私钥
RSAPrivateKey rsaprikey = loadPrivateKeyByStr(PRIVATE_KEY);
//解密
res = decrypt(rsaprikey,Base64.decodeBase64(content));
} catch (Exception e) {
logger.error("私钥解密出错",e);
e.printStackTrace();
}
return res;
}
/**
* 公钥解密
* @param content 加密后的密文
*/
public static String pubDecrypt(String content){
String res = "";
try {
//加载公钥
RSAPublicKey rsapubkey = loadPublicKeyByStr(PUBLIC_KEY);
//解密
res = decrypt(rsapubkey,Base64.decodeBase64(content));
} catch (Exception e) {
logger.error("公钥解密出错",e);
e.printStackTrace();
}
return res;
}
}
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