RSA加密pkcs1填充

其他 2018-05-31 16:22:23 阅读次数: 0

package com.ecton;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
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 java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import net.sf.json.JSONObject;

import org.apache.commons.lang.ArrayUtils;

public class RSAEncrypt {
/**
* 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' };

/**
* 随机生成密钥对
*/
public static void genKeyPair(String filePath) {
// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
KeyPairGenerator keyPairGen = null;
try {
keyPairGen = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 初始化密钥对生成器，密钥大小为96-1024位
keyPairGen.initialize(1024,new SecureRandom());
// 生成一个密钥对，保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
// 得到私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 得到公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
try {
// 得到公钥字符串
String publicKeyString = Base64.encode(publicKey.getEncoded());
// 得到私钥字符串
String privateKeyString = Base64.encode(privateKey.getEncoded());


System.out.println("公钥串：" + publicKeyString);

System.out.println("私钥串：" + privateKeyString);
// 将密钥对写入到文件
FileWriter pubfw = new FileWriter(filePath + "/publicKey.keystore");
FileWriter prifw = new FileWriter(filePath + "/privateKey.keystore");
BufferedWriter pubbw = new BufferedWriter(pubfw);
BufferedWriter pribw = new BufferedWriter(prifw);
pubbw.write(publicKeyString);
pribw.write(privateKeyString);
pubbw.flush();
pubbw.close();
pubfw.close();
pribw.flush();
pribw.close();
prifw.close();
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 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 static String loadPublicKeyByFile(String path) throws Exception {
try {
BufferedReader br = new BufferedReader(new FileReader(path
+ "/publicKey.keystore"));
String readLine = null;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
sb.append(readLine);
}
br.close();
return 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 static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)
throws Exception {
try {
byte[] buffer = Base64.decode(publicKeyStr);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
return (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
*
* @param keyFileName
* 私钥文件名
* @return 是否成功
* @throws Exception
*/
public static String loadPrivateKeyByFile(String path) throws Exception {
try {
BufferedReader br = new BufferedReader(new FileReader(path
+ "/privateKey.keystore"));
String readLine = null;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
sb.append(readLine);
}
br.close();
return 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 static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)
throws Exception {
try {
byte[] buffer = Base64.decode(privateKeyStr);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return (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 (NullPointerException 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 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 {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] output=null;

StringBuilder sb = new StringBuilder();
for (int i = 0; i < plainTextData.length; i += 100) {
byte[] doFinal = cipher.doFinal(ArrayUtils.subarray(plainTextData, i,
i + 100));
sb.append(new String(doFinal));
output = ArrayUtils.addAll(output, doFinal);
}



// 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");
}
}

/**
* 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 byte[] 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 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("加密私钥非法,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");
}
}

/**
* 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 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 {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
// byte[] output = cipher.doFinal(cipherData);

byte[] output;

StringBuilder sb = new StringBuilder();
for (int i = 0; i < cipherData.length; i += 128) {
byte[] doFinal = cipher.doFinal(ArrayUtils.subarray(cipherData, i,
i + 128));
sb.append(new String(doFinal,"UTF-8"));
}
output = sb.toString().getBytes("UTF-8");


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");
}
}





/**
* 私钥解密过程 -New
*
* @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 byte[] decryptNew(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= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
// byte[] output = cipher.doFinal(cipherData);

List<Byte> list =new ArrayList<Byte>();

for (int i = 0; i < cipherData.length; i += 128) {
byte[] doFinal = cipher.doFinal(ArrayUtils.subarray(cipherData, i,
i + 128));

for(byte b : doFinal){
list.add(b);
}
}
byte[] array = new byte[list.size()];
for(int i=0; i<list.size(); i++){
array[i] = list.get(i);
}

return array;
} 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");
}
}


/**
* 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 byte[] 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= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
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("解密公钥非法,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 HashMap<String, String> toHashMap(String jsonStr) {
HashMap<String, String> data = new HashMap<String, String>();
// 将json字符串转换成jsonObject
JSONObject jsonObject = JSONObject.fromObject(jsonStr);
Iterator<?> it = jsonObject.keys();
// 遍历jsonObject数据，添加到Map对象
while (it.hasNext()) {
String key = String.valueOf(it.next());
String value = (String) jsonObject.get(key);
data.put(key, value);
}
return data;
}




/**
* 随机生成密钥对
*/
public static Map<String, String> genKeyPairMap() {
// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
Map<String, String> keyPairMap = new HashMap<String, String>();
KeyPairGenerator keyPairGen = null;
try {
keyPairGen = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 初始化密钥对生成器，密钥大小为96-1024位
keyPairGen.initialize(1024,new SecureRandom());
// 生成一个密钥对，保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
// 得到私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 得到公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
try {
// 得到公钥字符串
String publicKeyString = Base64.encode(publicKey.getEncoded());
// 得到私钥字符串
String privateKeyString = Base64.encode(privateKey.getEncoded());


System.out.println("公钥串：" + publicKeyString);

System.out.println("私钥串：" + privateKeyString);

keyPairMap.put("publicKey", publicKeyString);
keyPairMap.put("privateKey", privateKeyString);
} catch (Exception e) {
e.printStackTrace();
}
return keyPairMap;
}


public static void main(String[] args) throws Exception{
// String filePath = "E:/keystore";
// String content = "6216261000000000018";
// System.out.println("原内容为：" + content);
// RSAPublicKey publicKey = loadPublicKeyByStr("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDQZY3hBd4Wft356cWFDONlWsfMmJcW0F9ZMrJw/MIqoKFLV6Q+lIgiiFbO1Q2jV7vTbphz1JCredBtsJjJo6PNe9EyH+BthMggh4SMvqncbn6mvpfKVw9OI7bmvLumQ29kx7nMRRGeClknnxTxvdR76bBWCy8B+o1xTvvRTVqIfQIDAQAB");
// RSAPrivateKey privateKey = loadPrivateKeyByStr("MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBANBljeEF3hZ+3fnpxYUM42Vax8yYlxbQX1kysnD8wiqgoUtXpD6UiCKIVs7VDaNXu9NumHPUkKt50G2wmMmjo8170TIf4G2EyCCHhIy+qdxufqa+l8pXD04jtua8u6ZDb2THucxFEZ4KWSefFPG91HvpsFYLLwH6jXFO+9FNWoh9AgMBAAECgYEAjA5EbR/xY3L+IjCfY80Gop6BOxquKFIAUsVEsbTdlaKA5E7RfpF6cKLqnHUJhma3P+DLKsWIOQZUMvQFqzaEJaXcLflhHqwGTE7xAPBJn1hKBzcnkJUtSfIitmpYKvXny5CeMpFiC1aPekhkqW9EAX1rhKhS1ClalhNECArRRUECQQDuVSyeZQ57xBfo1QQRXFYvEIMu7zEd2OhSvor9LgFIQJqKlDuBtjqhV3Y8Ed38yhKEcx0JzVaCQ30tBSzrPEYxAkEA39hJMpp+1sTmMsqSuARwCiun1cLiC+gnFRR2kkdEoxmIKzMuto4MpbvjjBBtyrcqGQR1vQbbST2DUWh6k6R4DQJBAOZCahI6Bk0y/fqX2w8+y5E6/dLZivWQO5y9tKC40spQiD58yiUevvRkALo2dOcm/87xPEvdE8hUldpqFqTKnfECQQDLPgWQJcj+1j6xZU78OENGaMb2BwHZj8tUj4TtYjpG4NrLZqiGZsnC/asotI4Lnm1h07PXks8uW+TM2NFbFt1NAkA3KATJQ33KZJDYO+Ft34sotoFU/BWx3pjJe/eku//XhRxFQpvbqrfoNQfE7YFwk/f3SHyskT5cbAVg/UatfSUe");
//
// byte[] encryptStrByPub = encrypt(publicKey, content.getBytes("UTF-8"));
// String encryptResult = Base64.encode(encryptStrByPub);
// System.out.println("加密串为：" + encryptResult);


String mengshenStr ="eH1BMfVgS00dPxH5rCQgBQOB3uDuE2m6VD9xwFobf6LayQcdBcbQgxj4hdqLrt+Rns8BJdLOEPPCJQLRXOIGlDzdsFRmWtY3w8oN2qXX/P8d5YILuQUJmUW3445gvXVbLMtIclf77XzxDZpWe24c4EBtDKNF/BoQC3YCx/l1guE=";

RSAPrivateKey privateKey1 = RSAEncrypt.loadPrivateKeyByStr("MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAKo8ZfKmC9p7CzdUCwkg5pqtcK92MPsHgr/ivrJFYYJmcb7P37xOnGCyORy62/FQEHPwg5l54oLk2kVkRt9V3nT1oPMu3rXb3KA8gtLdeok1ghcG1KjecEUiNY9KoycR4sXKi1AK5nTl5HEDyJiDzrCbKmvNEnVQYlSWx0LgofanAgMBAAECgYAayeBdG8YXvm8YaNBHwnando2Z/uZcSmVH3t2VXhenFonltf6GOnSfPsx/+eOsiKXeKMX8u9JqOKskalBAytlzmmnV6zT3Fqhli5TRstCFu9QsEZYXiQky7i4E5/gw3dj09/H+Dedbm4G6RSFh/GziI0JSEpoZowUX2iSI7X81MQJBAOAI6ZikULTvb3sqRg5srd7DHYndYD71QMGzciMAgfV/bKnp5zH9vubpNOsIfY12t1mjWCmb5Gpt3pLsgrLeP48CQQDChm3+tg5hTFtggI7NwgJArj8SuCfad3feguGayXjmbVs9ZsCy2FcAaa2Q+h0mxtHCTFZQrIzZYFhYfc+99UtpAkA/PqTbP3+9JF6/UVbHmayX11MOaV1TSJ8IT6Un9mu5p0hAy1RGC5EJ1Mnok9QFzH7EIlWwIV8hIHUV2wimgBFHAkEAlnfxwaMFwJGV5THMRLCbmXivZUV53m2nFUFcTaUmledlOjuvNyhNNA6KqaguwH3uZ0MxSToPwV3bOKgo96E0cQJAbo/6tICko7dcaKvz6FdMEfh4+2/XSb/rP2sS3MkSW//dqr3nfrCYiOFIq3VOE0ZEjCgGp3zAiST5GWB6hSktGw==");
String accNo="510265790128303";


// 解密卡号
//String realPayAcctNo = RsaDescryptUtil.decryptByPrivateKey(privateKey1, mengshenStr);

//System.out.println("rsaAcctNo:" + realPayAcctNo);
byte[] cipherData=RSAEncrypt.encrypt(privateKey1,accNo.getBytes("UTF-8"));
String rsaAcctNo=Base64.encode(cipherData);
System.out.println(rsaAcctNo);
// byte[] decryptStr = decrypt(privateKey, Base64.decode(encryptResult));
// String decryptResult = new String(decryptStr, "UTF-8");
// System.out.println("解密结果为：" + decryptResult);

}
}

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