Java加密算法 RSA

2015-06-06 08:44 511人阅读评论(0) 收藏举报

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JAVA（57）

公钥加密也称为非对称加密、速度慢、加密和解密的钥匙不相同，某一个人持有私钥，任何人都可以知道公钥

package com.stone.security;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Arrays;
import javax.crypto.Cipher;
/**
* RSA算法公钥加密非对称加密
* @author stone
* @date 2014-03-11 00:28:38
*/
public class RSA {
public static final String KEY_ALGORITHM = "RSA";
public static final String CIPHER_ALGORITHM_ECB1 = "RSA/ECB/PKCS1Padding";
public static final String CIPHER_ALGORITHM_ECB2 = "RSA/ECB/OAEPWithSHA-1AndMGF1Padding"; //不能用
public static final String CIPHER_ALGORITHM_ECB3 = "OAEPWithSHA-256AndMGF1Padding"; //不能用
static PublicKey publicKey;
static PrivateKey privateKey;
static Cipher cipher;
static KeyPair keyPair;
public static void main(String[] args) throws Exception {
method1("斯柯达U*(Sfsad7f()*^%%$");
method2("斯柯达U*(Sfsad7f()*^%%$");
method3("斯柯达U*(Sfsad7f()*^%%$");
}
/**
* 公钥加密，私钥解密使用默认CIPHER_ALGORITHM_ECB1
* @param str
* @throws Exception
*/
static void method1(String str) throws Exception {
KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
KeyPair keyPair = keyGenerator.generateKeyPair();
publicKey = keyPair.getPublic();
privateKey = keyPair.getPrivate();
cipher = Cipher.getInstance(KEY_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, publicKey); //公钥加密
byte[] encrypt = cipher.doFinal(str.getBytes());
System.out.println("公钥加密后1：" + Arrays.toString(encrypt));
cipher.init(Cipher.DECRYPT_MODE, privateKey);//私钥解密
byte[] decrypt = cipher.doFinal(encrypt);
System.out.println("私钥解密后1：" + new String(decrypt));
}
/**
* 私钥加密，公钥解密使用默认CIPHER_ALGORITHM_ECB1
* @param str
* @throws Exception
*/
static void method2(String str) throws Exception {
KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
KeyPair keyPair = keyGenerator.generateKeyPair();
publicKey = keyPair.getPublic();
privateKey = keyPair.getPrivate();
cipher = Cipher.getInstance(KEY_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, privateKey); //私钥加密
byte[] encrypt = cipher.doFinal(str.getBytes());
System.out.println("私钥加密后2：" + Arrays.toString(encrypt));
cipher.init(Cipher.DECRYPT_MODE, publicKey);//公钥解密
byte[] decrypt = cipher.doFinal(encrypt);
System.out.println("公钥解密后2：" + new String(decrypt));
}
/**
* 私钥加密，公钥解密使用CIPHER_ALGORITHM_ECB1 = RSA/ECB/PKCS1Padding
* @param str
* @throws Exception
*/
static void method3(String str) throws Exception {
KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
KeyPair keyPair = keyGenerator.generateKeyPair();
publicKey = keyPair.getPublic();
privateKey = keyPair.getPrivate();
cipher = Cipher.getInstance(CIPHER_ALGORITHM_ECB1);
cipher.init(Cipher.ENCRYPT_MODE, privateKey); //私钥加密
byte[] encrypt = cipher.doFinal(str.getBytes());
System.out.println("私钥加密后3：" + Arrays.toString(encrypt));
cipher.init(Cipher.DECRYPT_MODE, publicKey);//公钥解密
byte[] decrypt = cipher.doFinal(encrypt);
System.out.println("公钥解密后3：" + new String(decrypt));
}
}

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Java加密算法 RSA

Java加密算法 RSA

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