android(客户端)和PC(服务器端)通信RSA 加密解密
2013-12-06 11:39
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android客户端代码：
package com.suning.reminder.util;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Security;
import java.security.Signature;
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.Arrays;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMReader;
import org.bouncycastle.openssl.PasswordFinder;
public class RSAUtil {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* 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;
public static String privateKeyPath="private_key.pem";
public static String publicKeyPath="public_key.pem";
public static File getFile(){
String p=RSAUtil.class.getClassLoader().getResource(privateKeyPath).getPath();
return new File(Escape.unescape(p));
}
public static File getPublicFile(){
String p=RSAUtil.class.getClassLoader().getResource(publicKeyPath).getPath();
return new File(Escape.unescape(p));
}
/**
* 生成秘钥对
*
* @return
* @throws NoSuchAlgorithmException
*/
public static KeyPair generateKey() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
return keyPair;
}
/**
* 保存到properties文件
*
* @param keyPair
* @param publicKeyFile
* @param privateKeyFile
* @throws ConfigurationException
*/
public static void saveKey(KeyPair keyPair, String publicKeyFile,
String privateKeyFile) throws ConfigurationException {
PublicKey pubkey = keyPair.getPublic();
PrivateKey prikey = keyPair.getPrivate();
// save public key
PropertiesConfiguration publicConfig = new PropertiesConfiguration(
publicKeyFile);
publicConfig.setProperty("PULIICKEY", toHexString(pubkey.getEncoded()));
publicConfig.save();
// save private key
PropertiesConfiguration privateConfig = new PropertiesConfiguration(
privateKeyFile);
privateConfig.setProperty("PRIVATEKEY",
toHexString(prikey.getEncoded()));
privateConfig.save();
}
/**
* @param filename
* @param type
* ： 1-public 0-private
* @return
* @throws ConfigurationException
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
*/
public static PrivateKey loadKeyPRI(String filename)
throws ConfigurationException, NoSuchAlgorithmException,
InvalidKeySpecException {
PropertiesConfiguration config = new PropertiesConfiguration(filename);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
// privateKey
String privateKeyValue = config.getString("PRIVATEKEY");
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
toBytes(privateKeyValue));
PrivateKey privateKey = keyFactory.generatePrivate(priPKCS8);
return privateKey;
}
public static PublicKey loadKeyPUB(String filename)
throws ConfigurationException, NoSuchAlgorithmException,
InvalidKeySpecException {
PropertiesConfiguration config = new PropertiesConfiguration(filename);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
// publicKey
String privateKeyValue = config.getString("PULIICKEY");
X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(
toBytes(privateKeyValue));
PublicKey publicKey = keyFactory.generatePublic(bobPubKeySpec);
return publicKey;
}
/**
* Encrypt String.
*
* @return byte[]
*/
public static byte[] encrypt(RSAPublicKey publicKey, byte[] data) {
if (publicKey != null) {
try {
Cipher cipher = Cipher.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
/**
* Basic decrypt method
*
* @return byte[]
*/
public static byte[] decrypt(RSAPrivateKey privateKey, byte[] raw) {
if (privateKey != null) {
try {
Cipher cipher = Cipher.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(raw);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
public static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(HEXCHAR[(b[i] & 0xf0) >>> 4]);
sb.append(HEXCHAR[b[i] & 0x0f]);
}
return sb.toString();
}
public static final byte[] toBytes(String s) {
byte[] bytes;
bytes = new byte[s.length() / 2];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) Integer.parseInt(s.substring(2 * i, 2 * i + 2),
16);
}
return bytes;
}
private static char[] HEXCHAR = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
/**
* <p>
* 生成密钥对(公钥和私钥)
* </p>
*
* @return
* @throws Exception
*/
public static Map<String, Object> genKeyPair() throws Exception {
KeyPair keyPair = generateKey();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* <p>
* 用私钥对信息生成数字签名
* </p>
*
* @param data
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
*
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64Utils.encode(signature.sign());
}
/**
* <p>
* 校验数字签名
* </p>
*
* @param data
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @param sign
* 数字签名
*
* @return
* @throws Exception
*
*/
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
sign
ed1b
ature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64Utils.decode(sign));
}
/**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData,
String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* <p>
* 公钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] encryptedData,
String publicKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* <p>
* 公钥加密
* </p>
*
* @param data
* 源数据
* @param publicKey
* 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding");//keyFactory.getAlgorithm()解决javax.crypto.BadPaddingException: Blocktype异常的几种解决办法
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* <p>
* 私钥加密
* </p>
*
* @param data
* 源数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* <p>
* 获取私钥
* </p>
*
* @param keyMap
* 密钥对
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64Utils.encode(key.getEncoded());
}
/**
* <p>
* 获取公钥
* </p>
*
* @param keyMap
* 密钥对
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64Utils.encode(key.getEncoded());
}
public static PublicKey getPublicKey(String key) throws Exception {
byte[] keyBytes;
keyBytes =Base64Utils.decode(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
public static byte[] encrypt(PublicKey pubkey, String text) {
try {
Cipher rsa;
rsa = Cipher.getInstance(KEY_ALGORITHM);
rsa.init(Cipher.ENCRYPT_MODE, pubkey);
return rsa.doFinal(text.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String decrypt(PrivateKey decryptionKey, byte[] buffer) {
try {
Cipher rsa;
rsa = Cipher.getInstance(KEY_ALGORITHM);
rsa.init(Cipher.DECRYPT_MODE, decryptionKey);
byte[] utf8 = rsa.doFinal(buffer);
return new String(utf8, "UTF8");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static KeyPair readKeyPair(File privateKey, String keyPassword)
throws IOException {
FileReader fileReader = new FileReader(privateKey);
PEMReader r = new PEMReader(fileReader, new DefaultPasswordFinder(
keyPassword.toCharArray()));
try {
return (KeyPair) r.readObject();
} catch (IOException ex) {
throw ex;
} finally {
r.close();
fileReader.close();
}
}
public static Key readPublicKey(File privateKey, String keyPassword)
throws IOException {
FileReader fileReader = new FileReader(privateKey);
PEMReader r = new PEMReader(fileReader, new DefaultPasswordFinder(
keyPassword.toCharArray()));
try {
return (RSAPublicKey) r.readObject();
} catch (IOException ex) {
throw ex;
} finally {
r.close();
fileReader.close();
}
}
public static class DefaultPasswordFinder implements PasswordFinder {
private final char[] password;
private DefaultPasswordFinder(char[] password) {
this.password = password;
}
@Override
public char[] getPassword() {
return Arrays.copyOf(password, password.length);
}
}
// ----------------------------------------------------------
// 测试
public static void main(String args[]) throws Exception {
Security.addProvider(new BouncyCastleProvider());
/*String path = System.getProperty("project.root");
String p = "private_key.pem";
p=RSAUtil.class.getClassLoader().getResource(p).getPath();
StringBuffer sb=new StringBuffer();
File privateKey = new File(p);
KeyPair keyPair = RSAUtil.readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();*/
/*String path=System.getProperty("project.root");
Security.addProvider(new BouncyCastleProvider());
System.err.println("公钥加密——私钥解密");
File privateKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\private_key.pem");
KeyPair keyPair = readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
PublicKey pubkey = keyPair.getPublic();
String source = "logonId=18801148262&userId=34006452405&phoneNo=18801148262";
System.out.println("\r加密前文字：\r\n" + source);
byte[] data = source.getBytes();
byte[] encodedData = RSAUtil.encryptByPublicKey(data, Base64Utils
.encode(pubkey.getEncoded()));
String temp=Base64Utils.encode(encodedData);
//String temp="tBSLW2kbMJKHIkH46pUoCAsofxp7yYlUSzDRwoRN8WYuShhRaKv7MxPK+mdGj21+UFU9Dn+XEAu5JbjtTlt/XW3eVv26qeae3wMhE+c+MWEKyo5qBdkO2DnOpYmGPb0TPGyTDaI7NQJENus2EYeOd+CPfD4JKA15gUxoN0tZwo0=";
//String temp="gu6PFc7yPMcdJpOsNy5prFuObAJoSbYry4NWH8zmlhbx9bm5zgtF1HNiOwTIe9blZPfDHgLCyWyu78/FXJNtldaHwVhp12/Ez23iP701L3vxaBAC/mYXqW2ofGUsCSSPIJq3r+XraPvq1H/N4j4VvfkVBK+USB9ya9qupKn/Oj0=";
System.out.println("加密后文字：\r\n" + temp);
byte[] decodedData = RSAUtil.decryptByPrivateKey(Base64Utils.decode(temp),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);*/
Security.addProvider(new BouncyCastleProvider());
String userInfo=null;
//userInfo="logonId="+loginBackBean.getLogonId()+"&userId="+loginBackBean.getUserId()+"&phoneNo="+loginBackBean.getPhoneNo();
userInfo="logonId=15510717593&userId=34006452405&phoneNo=18801148262";
PublicKey publicKey = RSAUtil.getPublicKey(getFromAssets("D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\public_key.pem"));
System.out.println("\r加密前文字：\r\n" + userInfo);
byte[] encodedData = RSAUtil.encryptByPublicKey(userInfo.getBytes(), Base64Utils
.encode(publicKey.getEncoded()));
userInfo=Base64Utils.encode(encodedData);
System.out.println("加密后文字：\r\n" + userInfo);
/*File privateKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\private_key.pem");
KeyPair keyPair = readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
PublicKey pubkey = keyPair.getPublic();
byte[] encodedData = RSAUtil.encryptByPublicKey(userInfo.getBytes(), Base64Utils
.encode(publicKey.getEncoded()));
userInfo=Base64Utils.encode(encodedData);
System.out.println("加密后文字：\r\n" + userInfo);
//String prikey =getFromAssets("D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\private_key.pem");
byte[] decodedData = RSAUtil.decryptByPrivateKey(Base64Utils.decode(userInfo),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);*/
File privateKey = RSAUtil.getFile();
Security.addProvider(new BouncyCastleProvider());
KeyPair keyPair = RSAUtil.readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
byte[] decodedData = RSAUtil.decryptByPrivateKey(
Base64Utils.decode(userInfo),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);
/*
String source = "logonId=18801148262&userId=34006452405&phoneNo=18801148262";
File publicKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\rsa_public_key.pem");
File privateKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\rsa_private_key.pem");
KeyPair keyPair = readKeyPair(privateKey, "redbaby");
PrivateKey prikey = keyPair.getPrivate();
System.out.println(prikey);
PublicKey pubkey = (PublicKey) readPublicKey(publicKey, "redbaby");
System.out.println(pubkey);
System.out.println("\r加密前文字：\r\n" + source);
byte[] encodedData = encrypt(pubkey, source);
System.out.println("加密后文字：\r\n" + new String(encodedData));
String target = decrypt(prikey, encodedData);
System.out.println("解密后文字: \r\n" + target);*/
}
public void testSign() throws Exception {
// System.err.println("私钥加密——公钥解密");
// String source = "这是一行测试RSA数字签名的无意义文字";
// System.out.println("原文字：\r\n" + source);
// byte[] data = source.getBytes();
// byte[] encodedData = encryptByPrivateKey(data, privateKey);
// System.out.println("加密后：\r\n" + new String(encodedData));
// byte[] decodedData = decryptByPublicKey(encodedData, publicKey);
// String target = new String(decodedData);
// System.out.println("解密后: \r\n" + target);
// System.err.println("私钥签名——公钥验证签名");
// String sign = sign(encodedData, privateKey);
// System.err.println("签名:\r" + sign);
// boolean status = verify(encodedData, publicKey, sign);
// System.err.println("验证结果:\r" + status);
}
public String getFromAssets(String fileName){
String result="";
try {
InputStreamReader inputReader = new InputStreamReader(getAssets().open(fileName));
BufferedReader bufReader = new BufferedReader(inputReader);
String line="";
while((line = bufReader.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
发送请求：
PublicKey publicKey = RSAUtil.getPublicKey(getFromAssets(RSAUtil.publicKeyPath));
System.out.println("\r加密前文字：\r\n" + userInfo);
//PublicKey pubkey = (PublicKey)RSAUtil.encryptByPublicKey(publicKey);
byte[] encodedData = RSAUtil.encryptByPublicKey(userInfo.getBytes(), Base64Utils
.encode(publicKey.getEncoded()));
userInfo=Base64Utils.encode(encodedData);
System.out.println("加密后文字：\r\n" + userInfo);
服务器端主要代码：
/**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData,
String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
接收请求，处理私钥解密
File privateKey = RSAUtil.getFile();
Security.addProvider(new BouncyCastleProvider());
KeyPair keyPair = RSAUtil.readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
byte[] decodedData = RSAUtil.decryptByPrivateKey(
Base64Utils.decode(userInfo),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);
return target;
android客户端加密和pc服务器端解密需要注意事项：javax.crypto.BadPaddingException: Blocktype
1.异常描述：最近做项目为了增强数据传输的安全性用到了RSA加密。即android客户端将要传送的信息，用私钥通过RSA非对称加密算法加密后，传到服务器端(PC端)。服务器端用对应(密钥)的公钥来解密时解密失败，抛出“javax.crypto.BadPaddingException: Blocktype”异常。
2.异常原因：Android系统使用的虚拟机（dalvik）跟SUN标准JDK是有所区别的，其中他们默认的RSA实现就不同。即Android端用Cipher.getInstance("RSA")方法进行加密时，使用的provider是Bouncycastle Security provider，Bouncycastle Security provider默认实现的是“RSA/None/NoPadding”算法，而服务器(PC)端用Cipher.getInstance("RSA")进行解密时，使用的是Sun的security
provider，实现的是“RSA/None/PKCS1Padding”算法，所以，解密时会失败。
3.解决办法：我这里提供三种解决办法：
第一种：将服务器(pc)端的Cipher.getInstance("RSA")方法改为Cipher.getInstance("RSA/ECB/NoPadding")。但这种改法有一个缺点就是解密后的明文比加密之前多了很多空格。(空格的长度个数+原来的明文字符数=产生密钥时采用的bit数/8)
第二种：将Android端的Cipher.getInstance("RSA")方法改为Cipher.getInstance("RSA/None/PKCS1Padding")。这种方法解密后的明文和加密前的明文是对应的，不会出现第一种方法中的现象，推荐这种方法。
第三种：在服务器(pc)端的jdk中加入Bouncycastle Security provider，关于Bouncycastle JCE的安装配置及验证请参看
http://blog.csdn.net/caoshichao520326/article/details/8732670， 配置好Bouncycastle Security
provider后，将服务器(pc)端的Cipher.getInstance("RSA")方法改为Cipher.getInstance("RSA"，"BC")。
package com.suning.reminder.util;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Security;
import java.security.Signature;
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.Arrays;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMReader;
import org.bouncycastle.openssl.PasswordFinder;
public class RSAUtil {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* 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;
public static String privateKeyPath="private_key.pem";
public static String publicKeyPath="public_key.pem";
public static File getFile(){
String p=RSAUtil.class.getClassLoader().getResource(privateKeyPath).getPath();
return new File(Escape.unescape(p));
}
public static File getPublicFile(){
String p=RSAUtil.class.getClassLoader().getResource(publicKeyPath).getPath();
return new File(Escape.unescape(p));
}
/**
* 生成秘钥对
*
* @return
* @throws NoSuchAlgorithmException
*/
public static KeyPair generateKey() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
return keyPair;
}
/**
* 保存到properties文件
*
* @param keyPair
* @param publicKeyFile
* @param privateKeyFile
* @throws ConfigurationException
*/
public static void saveKey(KeyPair keyPair, String publicKeyFile,
String privateKeyFile) throws ConfigurationException {
PublicKey pubkey = keyPair.getPublic();
PrivateKey prikey = keyPair.getPrivate();
// save public key
PropertiesConfiguration publicConfig = new PropertiesConfiguration(
publicKeyFile);
publicConfig.setProperty("PULIICKEY", toHexString(pubkey.getEncoded()));
publicConfig.save();
// save private key
PropertiesConfiguration privateConfig = new PropertiesConfiguration(
privateKeyFile);
privateConfig.setProperty("PRIVATEKEY",
toHexString(prikey.getEncoded()));
privateConfig.save();
}
/**
* @param filename
* @param type
* ： 1-public 0-private
* @return
* @throws ConfigurationException
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
*/
public static PrivateKey loadKeyPRI(String filename)
throws ConfigurationException, NoSuchAlgorithmException,
InvalidKeySpecException {
PropertiesConfiguration config = new PropertiesConfiguration(filename);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
// privateKey
String privateKeyValue = config.getString("PRIVATEKEY");
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
toBytes(privateKeyValue));
PrivateKey privateKey = keyFactory.generatePrivate(priPKCS8);
return privateKey;
}
public static PublicKey loadKeyPUB(String filename)
throws ConfigurationException, NoSuchAlgorithmException,
InvalidKeySpecException {
PropertiesConfiguration config = new PropertiesConfiguration(filename);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
// publicKey
String privateKeyValue = config.getString("PULIICKEY");
X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(
toBytes(privateKeyValue));
PublicKey publicKey = keyFactory.generatePublic(bobPubKeySpec);
return publicKey;
}
/**
* Encrypt String.
*
* @return byte[]
*/
public static byte[] encrypt(RSAPublicKey publicKey, byte[] data) {
if (publicKey != null) {
try {
Cipher cipher = Cipher.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
/**
* Basic decrypt method
*
* @return byte[]
*/
public static byte[] decrypt(RSAPrivateKey privateKey, byte[] raw) {
if (privateKey != null) {
try {
Cipher cipher = Cipher.getInstance(KEY_ALGORITHM,
new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(raw);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
public static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(HEXCHAR[(b[i] & 0xf0) >>> 4]);
sb.append(HEXCHAR[b[i] & 0x0f]);
}
return sb.toString();
}
public static final byte[] toBytes(String s) {
byte[] bytes;
bytes = new byte[s.length() / 2];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) Integer.parseInt(s.substring(2 * i, 2 * i + 2),
16);
}
return bytes;
}
private static char[] HEXCHAR = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
/**
* <p>
* 生成密钥对(公钥和私钥)
* </p>
*
* @return
* @throws Exception
*/
public static Map<String, Object> genKeyPair() throws Exception {
KeyPair keyPair = generateKey();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* <p>
* 用私钥对信息生成数字签名
* </p>
*
* @param data
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
*
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64Utils.encode(signature.sign());
}
/**
* <p>
* 校验数字签名
* </p>
*
* @param data
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @param sign
* 数字签名
*
* @return
* @throws Exception
*
*/
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
sign
ed1b
ature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64Utils.decode(sign));
}
/**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData,
String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* <p>
* 公钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] encryptedData,
String publicKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* <p>
* 公钥加密
* </p>
*
* @param data
* 源数据
* @param publicKey
* 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding");//keyFactory.getAlgorithm()解决javax.crypto.BadPaddingException: Blocktype异常的几种解决办法
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* <p>
* 私钥加密
* </p>
*
* @param data
* 源数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* <p>
* 获取私钥
* </p>
*
* @param keyMap
* 密钥对
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64Utils.encode(key.getEncoded());
}
/**
* <p>
* 获取公钥
* </p>
*
* @param keyMap
* 密钥对
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64Utils.encode(key.getEncoded());
}
public static PublicKey getPublicKey(String key) throws Exception {
byte[] keyBytes;
keyBytes =Base64Utils.decode(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
public static byte[] encrypt(PublicKey pubkey, String text) {
try {
Cipher rsa;
rsa = Cipher.getInstance(KEY_ALGORITHM);
rsa.init(Cipher.ENCRYPT_MODE, pubkey);
return rsa.doFinal(text.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String decrypt(PrivateKey decryptionKey, byte[] buffer) {
try {
Cipher rsa;
rsa = Cipher.getInstance(KEY_ALGORITHM);
rsa.init(Cipher.DECRYPT_MODE, decryptionKey);
byte[] utf8 = rsa.doFinal(buffer);
return new String(utf8, "UTF8");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static KeyPair readKeyPair(File privateKey, String keyPassword)
throws IOException {
FileReader fileReader = new FileReader(privateKey);
PEMReader r = new PEMReader(fileReader, new DefaultPasswordFinder(
keyPassword.toCharArray()));
try {
return (KeyPair) r.readObject();
} catch (IOException ex) {
throw ex;
} finally {
r.close();
fileReader.close();
}
}
public static Key readPublicKey(File privateKey, String keyPassword)
throws IOException {
FileReader fileReader = new FileReader(privateKey);
PEMReader r = new PEMReader(fileReader, new DefaultPasswordFinder(
keyPassword.toCharArray()));
try {
return (RSAPublicKey) r.readObject();
} catch (IOException ex) {
throw ex;
} finally {
r.close();
fileReader.close();
}
}
public static class DefaultPasswordFinder implements PasswordFinder {
private final char[] password;
private DefaultPasswordFinder(char[] password) {
this.password = password;
}
@Override
public char[] getPassword() {
return Arrays.copyOf(password, password.length);
}
}
// ----------------------------------------------------------
// 测试
public static void main(String args[]) throws Exception {
Security.addProvider(new BouncyCastleProvider());
/*String path = System.getProperty("project.root");
String p = "private_key.pem";
p=RSAUtil.class.getClassLoader().getResource(p).getPath();
StringBuffer sb=new StringBuffer();
File privateKey = new File(p);
KeyPair keyPair = RSAUtil.readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();*/
/*String path=System.getProperty("project.root");
Security.addProvider(new BouncyCastleProvider());
System.err.println("公钥加密——私钥解密");
File privateKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\private_key.pem");
KeyPair keyPair = readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
PublicKey pubkey = keyPair.getPublic();
String source = "logonId=18801148262&userId=34006452405&phoneNo=18801148262";
System.out.println("\r加密前文字：\r\n" + source);
byte[] data = source.getBytes();
byte[] encodedData = RSAUtil.encryptByPublicKey(data, Base64Utils
.encode(pubkey.getEncoded()));
String temp=Base64Utils.encode(encodedData);
//String temp="tBSLW2kbMJKHIkH46pUoCAsofxp7yYlUSzDRwoRN8WYuShhRaKv7MxPK+mdGj21+UFU9Dn+XEAu5JbjtTlt/XW3eVv26qeae3wMhE+c+MWEKyo5qBdkO2DnOpYmGPb0TPGyTDaI7NQJENus2EYeOd+CPfD4JKA15gUxoN0tZwo0=";
//String temp="gu6PFc7yPMcdJpOsNy5prFuObAJoSbYry4NWH8zmlhbx9bm5zgtF1HNiOwTIe9blZPfDHgLCyWyu78/FXJNtldaHwVhp12/Ez23iP701L3vxaBAC/mYXqW2ofGUsCSSPIJq3r+XraPvq1H/N4j4VvfkVBK+USB9ya9qupKn/Oj0=";
System.out.println("加密后文字：\r\n" + temp);
byte[] decodedData = RSAUtil.decryptByPrivateKey(Base64Utils.decode(temp),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);*/
Security.addProvider(new BouncyCastleProvider());
String userInfo=null;
//userInfo="logonId="+loginBackBean.getLogonId()+"&userId="+loginBackBean.getUserId()+"&phoneNo="+loginBackBean.getPhoneNo();
userInfo="logonId=15510717593&userId=34006452405&phoneNo=18801148262";
PublicKey publicKey = RSAUtil.getPublicKey(getFromAssets("D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\public_key.pem"));
System.out.println("\r加密前文字：\r\n" + userInfo);
byte[] encodedData = RSAUtil.encryptByPublicKey(userInfo.getBytes(), Base64Utils
.encode(publicKey.getEncoded()));
userInfo=Base64Utils.encode(encodedData);
System.out.println("加密后文字：\r\n" + userInfo);
/*File privateKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\private_key.pem");
KeyPair keyPair = readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
PublicKey pubkey = keyPair.getPublic();
byte[] encodedData = RSAUtil.encryptByPublicKey(userInfo.getBytes(), Base64Utils
.encode(publicKey.getEncoded()));
userInfo=Base64Utils.encode(encodedData);
System.out.println("加密后文字：\r\n" + userInfo);
//String prikey =getFromAssets("D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\private_key.pem");
byte[] decodedData = RSAUtil.decryptByPrivateKey(Base64Utils.decode(userInfo),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);*/
File privateKey = RSAUtil.getFile();
Security.addProvider(new BouncyCastleProvider());
KeyPair keyPair = RSAUtil.readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
byte[] decodedData = RSAUtil.decryptByPrivateKey(
Base64Utils.decode(userInfo),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);
/*
String source = "logonId=18801148262&userId=34006452405&phoneNo=18801148262";
File publicKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\rsa_public_key.pem");
File privateKey = new File(
"D:\\workspace\\PBR_SERVICE\\src\\main\\resources\\rsa_private_key.pem");
KeyPair keyPair = readKeyPair(privateKey, "redbaby");
PrivateKey prikey = keyPair.getPrivate();
System.out.println(prikey);
PublicKey pubkey = (PublicKey) readPublicKey(publicKey, "redbaby");
System.out.println(pubkey);
System.out.println("\r加密前文字：\r\n" + source);
byte[] encodedData = encrypt(pubkey, source);
System.out.println("加密后文字：\r\n" + new String(encodedData));
String target = decrypt(prikey, encodedData);
System.out.println("解密后文字: \r\n" + target);*/
}
public void testSign() throws Exception {
// System.err.println("私钥加密——公钥解密");
// String source = "这是一行测试RSA数字签名的无意义文字";
// System.out.println("原文字：\r\n" + source);
// byte[] data = source.getBytes();
// byte[] encodedData = encryptByPrivateKey(data, privateKey);
// System.out.println("加密后：\r\n" + new String(encodedData));
// byte[] decodedData = decryptByPublicKey(encodedData, publicKey);
// String target = new String(decodedData);
// System.out.println("解密后: \r\n" + target);
// System.err.println("私钥签名——公钥验证签名");
// String sign = sign(encodedData, privateKey);
// System.err.println("签名:\r" + sign);
// boolean status = verify(encodedData, publicKey, sign);
// System.err.println("验证结果:\r" + status);
}
public String getFromAssets(String fileName){
String result="";
try {
InputStreamReader inputReader = new InputStreamReader(getAssets().open(fileName));
BufferedReader bufReader = new BufferedReader(inputReader);
String line="";
while((line = bufReader.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
发送请求：
PublicKey publicKey = RSAUtil.getPublicKey(getFromAssets(RSAUtil.publicKeyPath));
System.out.println("\r加密前文字：\r\n" + userInfo);
//PublicKey pubkey = (PublicKey)RSAUtil.encryptByPublicKey(publicKey);
byte[] encodedData = RSAUtil.encryptByPublicKey(userInfo.getBytes(), Base64Utils
.encode(publicKey.getEncoded()));
userInfo=Base64Utils.encode(encodedData);
System.out.println("加密后文字：\r\n" + userInfo);
服务器端主要代码：
/**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData,
String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
接收请求，处理私钥解密
File privateKey = RSAUtil.getFile();
Security.addProvider(new BouncyCastleProvider());
KeyPair keyPair = RSAUtil.readKeyPair(privateKey, "1234");
PrivateKey prikey = keyPair.getPrivate();
byte[] decodedData = RSAUtil.decryptByPrivateKey(
Base64Utils.decode(userInfo),
Base64Utils.encode(prikey.getEncoded()));
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);
return target;
android客户端加密和pc服务器端解密需要注意事项：javax.crypto.BadPaddingException: Blocktype
1.异常描述：最近做项目为了增强数据传输的安全性用到了RSA加密。即android客户端将要传送的信息，用私钥通过RSA非对称加密算法加密后，传到服务器端(PC端)。服务器端用对应(密钥)的公钥来解密时解密失败，抛出“javax.crypto.BadPaddingException: Blocktype”异常。
2.异常原因：Android系统使用的虚拟机（dalvik）跟SUN标准JDK是有所区别的，其中他们默认的RSA实现就不同。即Android端用Cipher.getInstance("RSA")方法进行加密时，使用的provider是Bouncycastle Security provider，Bouncycastle Security provider默认实现的是“RSA/None/NoPadding”算法，而服务器(PC)端用Cipher.getInstance("RSA")进行解密时，使用的是Sun的security
provider，实现的是“RSA/None/PKCS1Padding”算法，所以，解密时会失败。
3.解决办法：我这里提供三种解决办法：
第一种：将服务器(pc)端的Cipher.getInstance("RSA")方法改为Cipher.getInstance("RSA/ECB/NoPadding")。但这种改法有一个缺点就是解密后的明文比加密之前多了很多空格。(空格的长度个数+原来的明文字符数=产生密钥时采用的bit数/8)
第二种：将Android端的Cipher.getInstance("RSA")方法改为Cipher.getInstance("RSA/None/PKCS1Padding")。这种方法解密后的明文和加密前的明文是对应的，不会出现第一种方法中的现象，推荐这种方法。
第三种：在服务器(pc)端的jdk中加入Bouncycastle Security provider，关于Bouncycastle JCE的安装配置及验证请参看
http://blog.csdn.net/caoshichao520326/article/details/8732670， 配置好Bouncycastle Security
provider后，将服务器(pc)端的Cipher.getInstance("RSA")方法改为Cipher.getInstance("RSA"，"BC")。
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