openssl req -x509 -out public_key.der -outform der -new -newkey rsa:1024 -keyout private_key.pem
openssl rsa -in private_key.pem -pubout -out public_key.pem
openssl pkcs8 -topk8 -inform PEM -in private_key.pem -outform PEM -nocrypt -out private_key_pkcs8.pem
package com.test.ssl;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
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 org.bouncycastle.jce.provider.BouncyCastleProvider;
import sun.misc.BASE64Decoder;
public class RSAEncrypt {
private static final String DEFAULT_PUBLIC_KEY=
"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQChDzcjw/rWgFwnxunbKp7/4e8w" + "\r" +
"/UmXx2jk6qEEn69t6N2R1i/LmcyDT1xr/T2AHGOiXNQ5V8W4iCaaeNawi7aJaRht" + "\r" +
"Vx1uOH/2U378fscEESEG8XDqll0GCfB1/TjKI2aitVSzXOtRs8kYgGU78f7VmDNg" + "\r" +
"XIlk3gdhnzh+uoEQywIDAQAB" + "\r";
private static final String DEFAULT_PRIVATE_KEY=
"MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBAKEPNyPD+taAXCfG" + "\r" +
"6dsqnv/h7zD9SZfHaOTqoQSfr23o3ZHWL8uZzINPXGv9PYAcY6Jc1DlXxbiIJpp4" + "\r" +
"1rCLtolpGG1XHW44f/ZTfvx+xwQRIQbxcOqWXQYJ8HX9OMojZqK1VLNc61GzyRiA" + "\r" +
"ZTvx/tWYM2BciWTeB2GfOH66gRDLAgMBAAECgYBp4qTvoJKynuT3SbDJY/XwaEtm" + "\r" +
"u768SF9P0GlXrtwYuDWjAVue0VhBI9WxMWZTaVafkcP8hxX4QZqPh84td0zjcq3j" + "\r" +
"DLOegAFJkIorGzq5FyK7ydBoU1TLjFV459c8dTZMTu+LgsOTD11/V/Jr4NJxIudo" + "\r" +
"MBQ3c4cHmOoYv4uzkQJBANR+7Fc3e6oZgqTOesqPSPqljbsdF9E4x4eDFuOecCkJ" + "\r" +
"DvVLOOoAzvtHfAiUp+H3fk4hXRpALiNBEHiIdhIuX2UCQQDCCHiPHFd4gC58yyCM" + "\r" +
"6Leqkmoa+6YpfRb3oxykLBXcWx7DtbX+ayKy5OQmnkEG+MW8XB8wAdiUl0/tb6cQ" + "\r" +
"FaRvAkBhvP94Hk0DMDinFVHlWYJ3xy4pongSA8vCyMj+aSGtvjzjFnZXK4gIjBjA" + "\r" +
"2Z9ekDfIOBBawqp2DLdGuX2VXz8BAkByMuIh+KBSv76cnEDwLhfLQJlKgEnvqTvX" + "\r" +
"TB0TUw8avlaBAXW34/5sI+NUB1hmbgyTK/T/IFcEPXpBWLGO+e3pAkAGWLpnH0Zh" + "\r" +
"Fae7oAqkMAd3xCNY6ec180tAe57hZ6kS+SYLKwb4gGzYaCxc22vMtYksXHtUeamo" + "\r" +
"1NMLzI2ZfUoX" + "\r";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/** *//**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128; /**
* 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(1024, 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 {
BASE64Decoder base64Decoder= new BASE64Decoder();
byte[] buffer= base64Decoder.decodeBuffer(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 (IOException e) {
throw new Exception("公钥数据内容读取错误");
} catch (NullPointerException e) {
throw new Exception("公钥数据为空");
}
} /**
* 从文件中加载私钥
* @param keyFileName 私钥文件名
* @return 是否成功
* @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 {
BASE64Decoder base64Decoder= new BASE64Decoder();
byte[] buffer= base64Decoder.decodeBuffer(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) {
throw new Exception("私钥非法");
} catch (IOException e) {
throw new Exception("私钥数据内容读取错误");
} 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;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0; try {
cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
int inputLen = plainTextData.length;
//分段对数据加密
while(inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(plainTextData,offSet,MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(plainTextData, offSet, inputLen - offSet);
}
out.write(cache,0,cache.length);
i++;
offSet = i*MAX_ENCRYPT_BLOCK;
}
byte[] output= out.toByteArray();//cipher.doFinal(plainTextData);
out.close();
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;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
try {
cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
int inputLen = cipherData.length;
//分段对数据加密
while(inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(cipherData,offSet,MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(cipherData, offSet, inputLen - offSet);
}
out.write(cache,0,cache.length);
i++;
offSet = i*MAX_DECRYPT_BLOCK;
}
byte[] output= out.toByteArray();//cipher.doFinal(plainTextData);
out.close();
//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();
}
/**
* 十六进制转换字符串
* @param String str Byte字符串(Byte之间无分隔符 如:[616C6B])
* @return String 对应的字符串
*/
public static String hexStr2Str(String hexStr)
{
String str = "0123456789ABCDEF";
char[] hexs = hexStr.toCharArray();
byte[] bytes = new byte[hexStr.length() / 2];
int n; for (int i = 0; i < bytes.length; i++)
{
n = str.indexOf(hexs[2 * i]) * 16;
n += str.indexOf(hexs[2 * i + 1]);
bytes[i] = (byte) (n & 0xff);
}
return new String(bytes);
}
/**
* bytes转换成十六进制字符串
* @param byte[] b byte数组
* @return String 每个Byte值之间空格分隔
*/
public static String byte2HexStr(byte[] b)
{
String stmp="";
StringBuilder sb = new StringBuilder("");
for (int n=0;n<b.length;n++)
{
stmp = Integer.toHexString(b[n] & 0xFF);
sb.append((stmp.length()==1)? "0"+stmp : stmp);
sb.append("");
}
return sb.toString().toUpperCase().trim();
}
/**
* bytes字符串转换为Byte值
* @param String src Byte字符串，每个Byte之间没有分隔符
* @return byte[]
*/
public static byte[] hexStr2Bytes(String src)
{
int m=0,n=0;
int l=src.length()/2;
System.out.println(l);
byte[] ret = new byte[l];
for (int i = 0; i < l; i++)
{
m=i*2+1;
n=m+1;
ret[i] = Byte.decode("0x" + src.substring(i*2, m) + src.substring(m,n));
}
return ret;
} /**
* String的字符串转换成unicode的String
* @param String strText 全角字符串
* @return String 每个unicode之间无分隔符
* @throws Exception
*/
public static String strToUnicode(String strText)
throws Exception
{
char c;
StringBuilder str = new StringBuilder();
int intAsc;
String strHex;
for (int i = 0; i < strText.length(); i++)
{
c = strText.charAt(i);
intAsc = (int) c;
strHex = Integer.toHexString(intAsc);
if (intAsc > 128)
str.append("\\u" + strHex);
else // 低位在前面补00
str.append("\\u00" + strHex);
}
return str.toString();
}
/**
* unicode的String转换成String的字符串
* @param String hex 16进制值字符串 （一个unicode为2byte）
* @return String 全角字符串
*/
public static String unicodeToString(String hex)
{
int t = hex.length() / 6;
StringBuilder str = new StringBuilder();
for (int i = 0; i < t; i++)
{
String s = hex.substring(i * 6, (i + 1) * 6);
// 高位需要补上00再转
String s1 = s.substring(2, 4) + "00";
// 低位直接转
String s2 = s.substring(4);
// 将16进制的string转为int
int n = Integer.valueOf(s1, 16) + Integer.valueOf(s2, 16);
// 将int转换为字符
char[] chars = Character.toChars(n);
str.append(new String(chars));
}
return str.toString();
}
public static byte[] toByteArray(String hexString) {
if (hexString == null)
throw new IllegalArgumentException("this hexString must not be empty"); hexString = hexString.toLowerCase();
final byte[] byteArray = new byte[hexString.length() / 2];
int k = 0;
for (int i = 0; i < byteArray.length; i++) {
//因为是16进制，最多只会占用4位，转换成字节需要两个16进制的字符，高位在先
byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
byteArray[i] = (byte) (high << 4 | low);
k += 2;
}
return byteArray;
}
public static void main(String[] args){
RSAEncrypt rsaEncrypt= new RSAEncrypt();
//加载公钥
try {
rsaEncrypt.loadPublicKey(RSAEncrypt.DEFAULT_PUBLIC_KEY);
} 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);
} catch (Exception e) {
System.err.println(e.getMessage());
System.err.println("加载私钥失败");
}
//测试字符串
String encryptStr= "而广东统计局也表示，目前广东经济下行压力之大超乎年初预期，这既是复杂的国际经济环境影响的结果，也是广东主动调整经济结构、加快转型升级付出的代价。从上年一季度开始到今年一季度连续5个季度放缓后，今年上半年已经止跌并回升0.2个百分点，广东经济已开始筑底回稳。预计第三季度广东的经济运行将延续上半年的态势，在波动中略有回升，第四季度才会有较明显的好转。(中新网财经频道) (财经频道 李金磊)"; try {
//加密
byte[] cipher = rsaEncrypt.encrypt(rsaEncrypt.getPublicKey(), encryptStr.getBytes());
System.out.println(byte2HexStr(cipher));
//
String hexString = byte2HexStr(cipher);
//System.out.println(new String(hexToBytes(hexString)));
//解密
byte[] plainText = rsaEncrypt.decrypt(rsaEncrypt.getPrivateKey(), toByteArray(hexString));
//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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