每日一得--对称加密算法之(DES3)

本文介绍了使用Java实现3DES加密算法的过程,包括通过JDK和Bouncy Castle两种方式生成密钥、加密及解密的具体步骤,并展示了实际运行结果。

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 一,实现对称加密算法的方式:jdk实现方式和bcprov-jdk15-133.jar(简称bc)实现方式 



import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;




//3DES 速度慢
public class DES3Main {
private static String str= "husq DES test";
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
jdk3DES();
bc3DES();
}
//jdk DES
public static void jdk3DES(){
try{
//生成key
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
keyGenerator.init(168);
SecretKey secretKey = keyGenerator.generateKey();
byte[] byteKey = secretKey.getEncoded();

//key转换
DESKeySpec desKeySpec = new DESKeySpec(byteKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
Key convertSecretKey = factory.generateSecret(desKeySpec);

//加密
Cipher  cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
byte[] result = cipher.doFinal(str.getBytes());
System.out.println("jdk 3des encrypt="+Hex.encodeHexString(result));

//解密
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
byte[] dsign = cipher.doFinal(result);

System.out.println("jdk 3des decrypt="+new String(dsign));

System.out.println("==========================================");
}catch(Exception e){
e.printStackTrace();
}


}

//bcprov-jdk15-133.jar DES
public static void bc3DES(){
try{
Security.addProvider(new BouncyCastleProvider());

//生成key
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede","BC");
keyGenerator.getProvider();
keyGenerator.init(168);
SecretKey secretKey = keyGenerator.generateKey();
byte[] byteKey = secretKey.getEncoded();

//key转换
DESKeySpec desKeySpec = new DESKeySpec(byteKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
Key convertSecretKey = factory.generateSecret(desKeySpec);

//加密
Cipher  cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);
byte[] result = cipher.doFinal(str.getBytes());
System.out.println("bc 3des encrypt="+Hex.encodeHexString(result));


//解密
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
byte[] dsign = cipher.doFinal(result);

System.out.println("bc 3des decrypt="+new String(dsign));
}catch(Exception e){
e.printStackTrace();
}

}
}
Java生成密钥的实例    //产生单钥加密的密钥(myKey)   KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede"); //采用DESede算法   keyGenerator.init(168); //选择DESede算法,密钥长度为112位或168位   Key myKey = keyGenerator.generateKey(); //生成密钥   System.out.println("得到单钥加密密钥");   //产生双钥的密钥对(keyPair)   KeyPairGenerator keyPairGenerator=KeyPairGenerator.getInstance("RSA"); //采用RSA算法   keyPairGenerator.initialize(1024); //指定密钥长度为1024位   KeyPair keyPair = keyPairGenerator.generateKeyPair(); //生成密钥对   System.out.println("生成张三的公钥对");   //保存公钥的字节数组   File f = new File("publicKey.dat"); //保存公钥到文件publicKey.dat   FileOutputStream fout = new FileOutputStream(f);   fout.write(keyPair.getPublic().getEncoded()); //得到公钥的字节数组   fout.close(); //关闭文件输出流   System.out.println("保存公钥到文件: " f.getAbsolutePath());   //用Java对象序列化保存私钥,通常应对私钥加密后再保存   ObjectOutputStream oout = new ObjectOutputStream(new FileOutputStream("privateKey.dat")); //保存私钥到文件privateKey.dat   oout.writeObject(keyPair.getPrivate()); //序列化私钥   oout.close(); //关闭输出流   System.err.println("保存私钥到: privateKey.dat");   //从文件中得到公钥编码的字节数组   FileInputStream fin = new FileInputStream("publicKey.dat"); //打天publicKey.dat   ByteArrayOutputStream baout = new ByteArrayOutputStream(); //用于写入文件的字节流   int aByte = 0;   while ((aByte = fin.read())!= -1) //从文件读取一个字节   {    baout.write(aByte); //写入一个字节   }   fin.close(); //关闭文件输入流   byte[] keyBytes = baout.toByteArray(); //得到公钥的字节数组   baout.close(); //关闭字节数组输出流
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