java的AES加密算法和RSA非对称加密算法

一、AES加密算法：

 

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;public class AESEncryption {public static void main(String[] args) throws Exception {// 生成密钥KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");keyGenerator.init(128); // 可以是128, 192或256位SecretKey secretKey = keyGenerator.generateKey();byte[] keyBytes = secretKey.getEncoded();SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");// 加密Cipher cipher = Cipher.getInstance("AES");cipher.init(Cipher.ENCRYPT_MODE, keySpec);String plainText = "Hello World";byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);System.out.println("Encrypted: " + encryptedText);// 解密
        cipher.init(Cipher.DECRYPT_MODE, keySpec);byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(encryptedText));String decryptedText = new String(decryptedBytes);System.out.println("Decrypted: " + decryptedText);}
}

 

 

 

二、RSA非对称加密：

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Base64;
import javax.crypto.Cipher;public class RSAEncryption {public static void main(String[] args) throws Exception {// 生成密钥对KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");keyPairGenerator.initialize(2048); // 可以是1024, 2048等大小KeyPair keyPair = keyPairGenerator.generateKeyPair();PublicKey publicKey = keyPair.getPublic();PrivateKey privateKey = keyPair.getPrivate();// 加密Cipher encryptCipher = Cipher.getInstance("RSA");encryptCipher.init(Cipher.ENCRYPT_MODE, publicKey);String plainText = "Hello World";byte[] encryptedBytes = encryptCipher.doFinal(plainText.getBytes());String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);System.out.println("Encrypted: " + encryptedText);// 解密Cipher decryptCipher = Cipher.getInstance("RSA");decryptCipher.init(Cipher.DECRYPT_MODE, privateKey);byte[] decryptedBytes = decryptCipher.doFinal(Base64.getDecoder().decode(encryptedText));String decryptedText = new String(decryptedBytes);System.out.println("Decrypted: " + decryptedText);}
}

 

 

 

 

 

 

 

 

 

 

 

 

 

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