Java

java pkcs加密解密如何操作

小樊
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2024-09-20 17:49:33
栏目: 编程语言

在Java中,使用PKCS#1和PKCS#8进行加密和解密操作,你可以使用java.security包中的Cipher类。以下是使用这两种标准进行加密和解密的示例代码:

  1. PKCS#1加密
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class PKCS1Encryption {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        // 生成RSA密钥对
        KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");
        keyGenerator.init(2048);
        SecretKey secretKey = keyGenerator.generateKey();

        // 使用PKCS#1填充模式进行加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        String plainText = "Hello, World!";
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());

        // 输出加密后的Base64编码字符串
        System.out.println("Encrypted text: " + Base64.getEncoder().encodeToString(encryptedBytes));
    }
}
  1. PKCS#1解密
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class PKCS1Decryption {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        // 生成RSA密钥对(与加密时使用相同的密钥)
        KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");
        keyGenerator.init(2048);
        SecretKey secretKey = keyGenerator.generateKey();

        // 使用PKCS#1填充模式进行解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        String encryptedText = "Base64EncodedEncryptedText"; // 替换为实际的加密后的Base64编码字符串
        byte[] encryptedBytes = Base64.getDecoder().decode(encryptedText);
        byte[] decryptedBytes = cipher.doFinal(encryptedBytes);

        // 输出解密后的文本
        System.out.println("Decrypted text: " + new String(decryptedBytes));
    }
}
  1. PKCS#8加密
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.PKCS8EncodedKeySpec;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class PKCS8Encryption {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        // 生成RSA密钥对
        KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");
        keyGenerator.init(2048);
        SecretKey secretKey = keyGenerator.generateKey();

        // 将密钥转换为PKCS#8编码格式
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(secretKey.getEncoded());

        // 使用PKCS#8填充模式进行加密(注意:这里需要使用一个支持PKCS#8的加密算法,如AES)
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        String plainText = "Hello, World!";
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());

        // 输出加密后的Base64编码字符串
        System.out.println("Encrypted text: " + Base64.getEncoder().encodeToString(encryptedBytes));
    }
}
  1. PKCS#8解密
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.PKCS8EncodedKeySpec;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class PKCS8Decryption {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        // 生成RSA密钥对
        KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");
        keyGenerator.init(2048);
        SecretKey secretKey = keyGenerator.generateKey();

        // 将密钥转换为PKCS#8编码格式
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(secretKey.getEncoded());

        // 使用

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