在Java中,有多種方法可以對(duì)字符串進(jìn)行加密。以下是一些常用的加密算法:
javax.crypto
庫(kù)進(jìn)行AES加密的示例:import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
public class AESExample {
public static void main(String[] args) throws Exception {
String plainText = "Hello, World!";
String key = "ThisIsASecretKey"; // 16, 24或32個(gè)字符
SecretKey secretKey = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);
System.out.println("Encrypted Text: " + encryptedText);
}
}
注意:在實(shí)際應(yīng)用中,不建議使用硬編碼的密鑰,而應(yīng)該將其安全地存儲(chǔ)和管理。
javax.crypto
庫(kù)進(jìn)行RSA加密的示例:import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.util.Base64;
public class RSAExample {
public static void main(String[] args) throws Exception {
String plainText = "Hello, World!";
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(2048);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
PublicKey publicKey = keyPair.getPublic();
PrivateKey privateKey = keyPair.getPrivate();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);
System.out.println("Encrypted Text: " + encryptedText);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(encryptedText));
String decryptedText = new String(decryptedBytes);
System.out.println("Decrypted Text: " + decryptedText);
}
}
同樣,在實(shí)際應(yīng)用中,不建議使用硬編碼的密鑰,而應(yīng)該將其安全地存儲(chǔ)和管理。
以上示例僅用于演示目的,實(shí)際應(yīng)用中可能需要根據(jù)具體需求進(jìn)行調(diào)整和優(yōu)化。在選擇加密算法時(shí),請(qǐng)確保選擇適合您需求的算法,并遵循最佳實(shí)踐來(lái)保護(hù)您的數(shù)據(jù)和系統(tǒng)安全。