What are the commonly used encryption and decryption tools in Java function libraries?

The Java function library provides a wealth of encryption and decryption tools, including JCE, JCA, Apache Commons Crypt, etc. JCE provides encryption algorithms and functions, JCA provides interfaces to access encryption service providers, and Apache Commons Crypt contains more encryption algorithms and tools. The practical case shows how to use JCE to AES encrypt text and generate Base64-encoded ciphertext.

Commonly used encryption and decryption tools in Java function library

Introduction

Encryption and decryption are important techniques for protecting sensitive data from unauthorized access. Java provides a rich library of functions to assist in these tasks. This blog post will introduce commonly used encryption and decryption tools in Java function libraries and demonstrate their usage through practical cases.

Commonly used tools

1. Java Cryptography Extension (JCE)

JCE is part of the Java standard library and provides A range of encryption algorithms and functions. It includes:

• Symmetric encryption (such as AES, DES)
• Asymmetric encryption (such as RSA)
• Message digest (such as MD5, SHA)
• Digital Signature

2. Java Cryptographic Architecture (JCA)

JCA is an abstraction layer on JCE that provides access to encryption service providers (such as Bouncy Castle) interface. It simplifies the algorithm and provider selection process.

3. Apache Commons Crypt

Apache Commons Crypt is a third-party function library that provides various encryption algorithms and tools, including:

• Symmetric encryption (such as AES, 3DES)
• Asymmetric encryption (such as RSA)
• Message digest (such as MD5, SHA)
• Key generation and management

Practical Case

Suppose we want to use the Java function library to AES encrypt a piece of text. The following code snippet shows how to do this using JCE:

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class Main {
    public static void main(String[] args) throws Exception {
        // 数据明文
        String plaintext = "Hello World";

        // 生成 AES 密钥
        byte[] key = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");

        // 初始化 AES 加密器
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);

        // 加密数据
        byte[] ciphertext = cipher.doFinal(plaintext.getBytes());

        // 将密文编码为 Base64 格式
        String encodedCiphertext = java.util.Base64.getEncoder().encodeToString(ciphertext);

        // 输出密文
        System.out.println("密文：" + encodedCiphertext);
    }
}

This code generates a Base64-encoded ciphertext that contains the plaintext encrypted using the AES encryption algorithm.

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