注意JAVA 的STRING .getBytes() 默认取的是操作系统的编码，最好统一UTF-8.
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package javaapplication1; import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map; import javax.crypto.Cipher; /**
*
* @author jk
*/
public class RSAUtils { /**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA"; // public static final String ECB_PKCS1_PADDING = "RSA";//加密填充方式 public static final String ECB_PKCS1_PADDING = "RSA/ECB/PKCS1Padding";//加密填充方式 private static final int _rsa_keysize = 1024; /**
* RSA最大加密明文大小,keysize=1024, (1024/8)-11=117
*/
private static final int MAX_ENCRYPT_BLOCK = (_rsa_keysize/8)-11; public static final String _charset = "UTF-8"; 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
String getAgorithm = keyFactory.getAlgorithm();
getAgorithm = ECB_PKCS1_PADDING;
Cipher cipher = Cipher.getInstance(getAgorithm);
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;
} /**
* java端公钥加密
*/
public static String encryptedDataOnJava(String data, String PUBLICKEY) {
try {
data = Base64Utils.encode(encryptByPublicKey(data.getBytes(_charset), PUBLICKEY));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return data;
} }
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package javaapplication1; import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.codec.binary.Base64; /**
* */
/**
* <p>
* BASE64编码解码工具包
* </p>
* <p>
* 依赖javabase64-1.3.1.jar
* </p>
*
* @author IceWee
* @date 2012-5-19
* @version 1.0
*/
public class Base64Utils { /**
* */
/**
* 文件读取缓冲区大小
*/
private static final int CACHE_SIZE = 1024; public static final String _charset = "UTF-8"; /**
* */
/**
* <p>
* BASE64字符串解码为二进制数据
* </p>
*
* @param base64
* @return
* @throws Exception
*/
public static byte[] decode(String str) throws Exception {
Base64 _base64 = new Base64();
return _base64.decodeBase64(str.getBytes(_charset));
} /**
* */
/**
* <p>
* 二进制数据编码为BASE64字符串
* </p>
*
* @param bytes
* @return
* @throws Exception
*/
public static String encode(byte[] bytes) throws Exception {
Base64 _base64 = new Base64();
return new String(_base64.encodeBase64Chunked(bytes));
} /**
* */
/**
* <p>
* 将文件编码为BASE64字符串
* </p>
* <p>
* 大文件慎用，可能会导致内存溢出
* </p>
*
* @param filePath 文件绝对路径
* @return
* @throws Exception
*/
public static String encodeFile(String filePath) throws Exception {
byte[] bytes = fileToByte(filePath);
return encode(bytes);
} /**
* */
/**
* <p>
* BASE64字符串转回文件
* </p>
*
* @param filePath 文件绝对路径
* @param base64 编码字符串
* @throws Exception
*/
public static void decodeToFile(String filePath, String base64) throws Exception {
byte[] bytes = decode(base64);
byteArrayToFile(bytes, filePath);
} /**
* */
/**
* <p>
* 文件转换为二进制数组
* </p>
*
* @param filePath 文件路径
* @return
* @throws Exception
*/
public static byte[] fileToByte(String filePath) throws Exception {
byte[] data = new byte[0];
File file = new File(filePath);
if (file.exists()) {
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
byte[] cache = new byte[CACHE_SIZE];
int nRead = 0;
while ((nRead = in.read(cache)) != -1) {
out.write(cache, 0, nRead);
out.flush();
}
out.close();
in.close();
data = out.toByteArray();
}
return data;
} /**
* */
/**
* <p>
* 二进制数据写文件
* </p>
*
* @param bytes 二进制数据
* @param filePath 文件生成目录
*/
public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
InputStream in = new ByteArrayInputStream(bytes);
File destFile = new File(filePath);
if (!destFile.getParentFile().exists()) {
destFile.getParentFile().mkdirs();
}
destFile.createNewFile();
OutputStream out = new FileOutputStream(destFile);
byte[] cache = new byte[CACHE_SIZE];
int nRead = 0;
while ((nRead = in.read(cache)) != -1) {
out.write(cache, 0, nRead);
out.flush();
}
out.close();
in.close();
} }
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