import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import org.apache.commons.codec.binary.Base64;
public class RSACryptography {
public static String data = "hello world";
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
KeyPair keyPair = genKeyPair(1024);
// 获取公钥,并以base64格式打印出来
PublicKey publicKey = keyPair.getPublic();
System.out.println("公钥:" + new String(Base64.encodeBase64String(publicKey.getEncoded())));
// 获取私钥,并以base64格式打印出来
PrivateKey privateKey = keyPair.getPrivate();
System.out.println("私钥:" + new String(Base64.encodeBase64String(privateKey.getEncoded())));
// 公钥加密
byte[] encryptedBytes = encrypt(data.getBytes(), publicKey);
// System.out.println("加密后乱码:"+ new String(encryptedBytes)); //打印出来是乱码
String encoded = Base64.encodeBase64String(encryptedBytes); // Base64编码
System.out.println("加密后_Base64编码:" + new String(encoded));
// 私钥解密
byte[] decryptedBytes = decrypt(encryptedBytes, privateKey);
System.out.println("解密后:" + new String(decryptedBytes));
}
// 生成密钥对
public static KeyPair genKeyPair(int keyLength) throws Exception {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(1024);
return keyPairGenerator.generateKeyPair();
}
// 公钥加密
public static byte[] encrypt(byte[] content, PublicKey publicKey) throws Exception {
Cipher cipher = Cipher.getInstance("RSA");// java默认"RSA"="RSA/ECB/PKCS1Padding"
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(content);
}
// 私钥解密
public static byte[] decrypt(byte[] content, PrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(content);
}
/**
* 字符串转为公钥
*
* @param key
* @return
* @throws Exception
*/
public static PublicKey getPublicKey(String key) throws Exception {
byte[] keyBytes = Base64.decodeBase64(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
/**
* 字符串转私钥
*
* @param key
* @return
* @throws Exception
*/
public static PrivateKey getPrivateKey(String key) throws Exception {
byte[] keyBytes = Base64.decodeBase64(key);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
}
}
完整的RSA开发流程以及加解密Demo
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转载自blog.csdn.net/qq_22075041/article/details/80698665
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