com.young.security.RSAEncrypt Maven / Gradle / Ivy
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package com.young.security;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
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 javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import com.young.security.utils.Base64;
public class RSAEncrypt {
private static final String DEFAULT_PUBLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDe0vQcgnUqEOsdNe5OIkYdTRVL"
+ "\r" + "JLCYNSca7+vIMF1PeFM84M3tL8I+pbrd0K1iRCQ9mk0aKsMaUkhrX7ZeCIziZcm0" + "\r"
+ "tS364/dQ4eQBAm98M4pEj9Ijuwmhl4LbHDXJe/nh1wd7+ycDB9L2tkKJAybB0fP8" + "\r" + "6cZTKvNXB46wo3lJzwIDAQAB"
+ "\r";
private static final String DEFAULT_PRIVATE_KEY = "X8axF4fQHTbcPgwBcXFIjcBbmtbjuSfRluVXCtafOCoBoHSsGxgNlgHlKm4N/oSM"
+ "\r" + "nz+7S1IU0V5Ya5okm3NaB4KotOWZ86w+sD2BCD0MK9zHVmEnNQIMumN6zFzAN5KJ" + "\r"
+ "6mlQBh2n5lG/X+XmyPtBxlM5TRdPlH8CCmJU9TmEOZmVQTaYCUO/w9crjyH1YJ+O" + "\r"
+ "d+J+zq73eaSy/8WJBIspIOxpRZA7V2qFFe2YgTot0I6zg9zIBUXwQ9bO7bQqfCL1" + "\r"
+ "LHJh6A8Zua5EP63RRUE08bcWFbZO7OlBNeYitLN3NBKYGZjCxc0qBhIZPFBGlRyR" + "\r"
+ "3WUxCBJdoVwEqINT0ZDi8VyZDYgNOq0YQv2/i4tQKLfgzUh0YJ5dkibFI3dzvusi" + "\r"
+ "TyydcFJoPV+d3Vp/mFvnHd27GKr7aB9WRqSeULq+okDJpFVtx66YQJ/eUUu9JGrt" + "\r"
+ "VZ9N4dpp8j+/0FcZN/FSLnLizHr6fxSC+N33sHorgui8sXqb6E3vdaABYk6xStDN" + "\r"
+ "tOpFMC3v0G8tsRqHZdZabrkPBXczxY3j/qoexhHT7O+vCRL7g2QQHWkrJs9Hrb8H" + "\r"
+ "60G/9B44l8qf7a5nYiblEYFJPsIgWEI5SSydFAE1sFxfaynhDIa1KbxtYAvsik6I" + "\r"
+ "+iQkTAYR/mgosj6V8vH/Y2njkDYALT1FBE1nZCGXmdFPE9iJJ8HKuFMJMz35LOYf" + "\r"
+ "FX0tin/IoV1MTnoGQ8hRbUMAeccjb2G+2fLqLoM3/3/7K1xCBVrOSF5jekxgfnaI" + "\r"
+ "xx5rNoy6M0+Lj7DBqSwDfiTZL/2Af3osR8TxibmCDuffetYu2a63dg==" + "\r";
/**
* 私钥
*/
private RSAPrivateKey privateKey;
/**
* 公钥
*/
private RSAPublicKey publicKey;
/**
* 字节数据转字符串专用集合
*/
private static final char[] HEX_CHAR = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
'f' };
/**
* 获取私钥
*
* @return 当前的私钥对象
*/
public RSAPrivateKey getPrivateKey() {
return privateKey;
}
/**
* 获取公钥
*
* @return 当前的公钥对象
*/
public RSAPublicKey getPublicKey() {
return publicKey;
}
/**
* 随机生成密钥对
*/
public void genKeyPair() {
KeyPairGenerator keyPairGen = null;
try {
keyPairGen = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
keyPairGen.initialize(512, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
this.privateKey = (RSAPrivateKey) keyPair.getPrivate();
this.publicKey = (RSAPublicKey) keyPair.getPublic();
}
/**
* 从文件中输入流中加载公钥
*
* @param in
* 公钥输入流
* @throws Exception
* 加载公钥时产生的异常
*/
public void loadPublicKey(InputStream in) throws Exception {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String readLine = null;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
sb.append('\r');
}
}
loadPublicKey(sb.toString());
} catch (IOException e) {
throw new Exception("公钥数据流读取错误");
} catch (NullPointerException e) {
throw new Exception("公钥输入流为空");
}
}
/**
* 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 void loadPublicKey(String publicKeyStr) throws Exception {
try {
byte[] buffer =Base64.decode(publicKeyStr);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
this.publicKey = (RSAPublicKey) keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此算法");
} catch (InvalidKeySpecException e) {
throw new Exception("公钥非法");
} catch (NullPointerException e) {
throw new Exception("公钥数据为空");
}
}
/**
* 从文件中加载私钥
*
* @throws Exception
*/
public void loadPrivateKey(InputStream in) throws Exception {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String readLine = null;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
sb.append('\r');
}
}
loadPrivateKey(sb.toString());
} catch (IOException e) {
throw new Exception("私钥数据读取错误");
} catch (NullPointerException e) {
throw new Exception("私钥输入流为空");
}
}
public void loadPrivateKey(String privateKeyStr) throws Exception {
try {
byte[] buffer = Base64.decode(privateKeyStr);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
this.privateKey = (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此算法");
} catch (InvalidKeySpecException e) {
e.printStackTrace();
throw new Exception("私钥非法");
} catch (NullPointerException e) {
throw new Exception("私钥数据为空");
}
}
/**
* 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 byte[] 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("RSA");// , new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(plainTextData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("加密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
throw new Exception("明文数据已损坏");
}
}
/**
* 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 byte[] 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 {
cipher = Cipher.getInstance("RSA");// , new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(cipherData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("解密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
throw new Exception("密文数据已损坏");
}
}
/**
* 字节数据转十六进制字符串
*
* @param data
* 输入数据
* @return 十六进制内容
*/
public static String byteArrayToString(byte[] data) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < data.length; i++) {
// 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移
stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
// 取出字节的低四位 作为索引得到相应的十六进制标识符
stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
if (i < data.length - 1) {
stringBuilder.append(' ');
}
}
return stringBuilder.toString();
}
public static void main(String[] args) {
RSAEncrypt rsaEncrypt = new RSAEncrypt();
rsaEncrypt.genKeyPair();
String p = RSAEncrypt.byteArrayToString(rsaEncrypt.getPrivateKey().getEncoded());
System.out.println(p);
// 加载公钥
try {
rsaEncrypt.loadPublicKey(RSAEncrypt.DEFAULT_PUBLIC_KEY);
System.out.println("加载公钥成功");
} catch (Exception e) {
System.err.println(e.getMessage());
System.err.println("加载公钥失败");
}
// 加载私钥
try {
rsaEncrypt.loadPrivateKey(RSAEncrypt.DEFAULT_PRIVATE_KEY);
System.out.println("加载私钥成功");
} catch (Exception e) {
System.err.println(e.getMessage());
System.err.println("加载私钥失败");
}
// 测试字符串
String encryptStr = "abc";
System.out.println("私钥长度：" + rsaEncrypt.getPrivateKey().toString().length());
System.out.println("公钥长度：" + rsaEncrypt.getPublicKey().toString().length());
try {
// 加密
byte[] cipher = rsaEncrypt.encrypt(rsaEncrypt.getPublicKey(), encryptStr.getBytes());
// 解密
byte[] plainText = rsaEncrypt.decrypt(rsaEncrypt.getPrivateKey(), cipher);
System.out.println("密文长度:" + cipher.length);
System.out.println(RSAEncrypt.byteArrayToString(cipher));
System.out.println("明文长度:" + plainText.length);
System.out.println(RSAEncrypt.byteArrayToString(plainText));
System.out.println(new String(plainText));
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
}
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