Java AES加解密工具类封装|Java、加密解密、安全函数、算法|Nick Tan-梓潼Blog

本文将介绍如何使用JDK中的Java密码体系结构（JCA）来实现AES加密和解密。对称密钥块密码在数据加密中起重要作用。这意味着同一密钥可用于加密和解密。高级加密标准（AES）是一种广泛使用的对称密钥加密算法。

一、AES算法是什么？

AES算法是一种迭代的对称密钥块密码，它支持128、192和256位的加密密钥（秘密密钥），以对128位的块中的数据进行加密和解密。

二、AES生成密钥的两种方法

在AES中生成密钥的方法有两种：

从随机数生成
从给定密码生成

1、从随机数生成

在第一种方法中，应该从像SecureRandom类这样的加密安全（伪）随机数生成器生成秘密密钥。为了生成密钥，我们可以使用KeyGenerator类。让我们定义一种用于生成大小为n（128、192和256）位的AES密钥的方法：

public static SecretKey generateKey(int n) throws NoSuchAlgorithmException {
    KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
    keyGenerator.init(n);
    SecretKey key = keyGenerator.generateKey();
    return key;
}

2、从给定密码生成

在第二种方法中，可以使用基于密码的密钥派生功能（例如PBKDF2）从给定的密码派生AES秘密密钥。下面方法可通过65,536次迭代和256位密钥长度从给定密码生成AES密钥：

public static SecretKey getKeyFromPassword(String password, String salt)
      throws NoSuchAlgorithmException, InvalidKeySpecException {
    SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
    KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
    SecretKey secret = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
    return secret;
}

三、AES主要用途

1、加密字符串

1）初始化向量IV

要实现输入字符串加密，我们首先需要根据上一节生成密钥和初始化向量IV：

IV是伪随机值，其大小与加密的块相同。我们可以使用SecureRandom类生成随机IV。

让我们定义一种生成IV的方法：

public static IvParameterSpec generateIv() {
    byte[] iv = new byte[16];
    new SecureRandom().nextBytes(iv);
    return new IvParameterSpec(iv);
}

2）对输入字符串进行加密

下一步，我们使用getInstance()方法从Cipher类创建一个实例。此外，我们使用带有秘密密钥，IV和加密模式的init()方法配置密码实例。最后，我们通过调用doFinal()方法对输入字符串进行加密。此方法获取输入字节并以字节为单位返回密文：

public static String encrypt(String algorithm, String input, SecretKey key, IvParameterSpec iv)
      throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, 
      InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    Cipher cipher = Cipher.getInstance(algorithm);
    cipher.init(Cipher.ENCRYPT_MODE, key, iv);
    byte[] cipherText = cipher.doFinal(input.getBytes());
    return Base64.getEncoder().encodeToString(cipherText);
}

3）使用初始化密码解密内容

为了解密输入字符串，我们可以使用DECRYPT_MODE初始化密码来解密内容：

public static String decrypt(String algorithm, String cipherText, SecretKey key, IvParameterSpec iv) 
      throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, 
      InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    Cipher cipher = Cipher.getInstance(algorithm);
    cipher.init(Cipher.DECRYPT_MODE, key, iv);
    byte[] plainText = cipher.doFinal(Base64.getDecoder().decode(cipherText));
    return new String(plainText);
}

4）测试用例

编写一个用于加密和解密字符串输入的测试方法：

@Test
void givenString_whenEncrypt_thenSuccess()
      throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException,
      BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException { 
    String input = "test";
    SecretKey key = AESUtil.generateKey(128);
    IvParameterSpec ivParameterSpec = AESUtil.generateIv();
    String algorithm = "AES/CBC/PKCS5Padding";
    String cipherText = AESUtil.encrypt(algorithm, input, key, ivParameterSpec);
    String plainText = AESUtil.decrypt(algorithm, cipherText, key, ivParameterSpec);
    Assertions.assertEquals(input, plainText);
}

2、加密文件

现在，让我们使用AES算法加密文件。步骤是相同的，但是我们需要一些IO类来处理文件。

1）加密文本文件

让我们加密一个文本文件：

public static void encryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
      File inputFile, File outputFile) throws IOException, NoSuchPaddingException,
      NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
      BadPaddingException, IllegalBlockSizeException {
    Cipher cipher = Cipher.getInstance(algorithm);
    cipher.init(Cipher.ENCRYPT_MODE, key, iv);
    FileInputStream inputStream = new FileInputStream(inputFile);
    FileOutputStream outputStream = new FileOutputStream(outputFile);
    byte[] buffer = new byte[64];
    int bytesRead;
    while ((bytesRead = inputStream.read(buffer)) != -1) {
        byte[] output = cipher.update(buffer, 0, bytesRead);
        if (output != null) {
            outputStream.write(output);
        }
    }
    byte[] outputBytes = cipher.doFinal();
    if (outputBytes != null) {
        outputStream.write(outputBytes);
    }
    inputStream.close();
    outputStream.close();
}

请注意，不建议尝试将整个文件（尤其是大文件）读入内存。相反，我们一次加密一个缓冲区。

2）解密加密文件

为了解密文件，我们使用类似的步骤，并使用DECRYPT_MODE初始化密码，如前所述。

public static void decryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
      File encryptedFile, File decryptedFile) throws IOException, NoSuchPaddingException,
      NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
      BadPaddingException, IllegalBlockSizeException {
    Cipher cipher = Cipher.getInstance(algorithm);
    cipher.init(Cipher.DECRYPT_MODE, key, iv);
    FileInputStream inputStream = new FileInputStream(encryptedFile);
    FileOutputStream outputStream = new FileOutputStream(decryptedFile);
    byte[] buffer = new byte[64];
    int bytesRead;
    while ((bytesRead = inputStream.read(buffer)) != -1) {
        byte[] output = cipher.update(buffer, 0, bytesRead);
        if (output != null) {
            outputStream.write(output);
        }
    }
    byte[] output = cipher.doFinal();
    if (output != null) {
        outputStream.write(output);
    }
    inputStream.close();
    outputStream.close();
}

3）测试用例

再次，让我们定义一个用于加密和解密文本文件的测试方法。在这种方法中，我们从测试资源目录中读取test.txt文件，将其加密为一个名为test.encrypted的文件，然后将该文件解密为一个新文件：

@Test
void givenFile_whenEncrypt_thenSuccess() 
      throws NoSuchAlgorithmException, IOException, IllegalBlockSizeException, InvalidKeyException, 
      BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
    SecretKey key = AESUtil.generateKey(128);
    String algorithm = "AES/CBC/PKCS5Padding";
    IvParameterSpec ivParameterSpec = AESUtil.generateIv();
    Resource resource = new ClassPathResource("inputFile/test.txt");
    File inputFile = resource.getFile();
    File encryptedFile = new File("classpath:test.encrypted");
    File decryptedFile = new File("document.decrypted");
    AESUtil.encryptFile(algorithm, key, ivParameterSpec, inputFile, encryptedFile);
    AESUtil.decryptFile(algorithm, key, ivParameterSpec, encryptedFile, decryptedFile);
    assertThat(inputFile).hasSameTextualContentAs(decryptedFile);
}

3、基于密码加解密

我们可以使用从给定密码派生的密钥进行AES加密和解密。

1）生成密钥

为了生成密钥，我们使用getKeyFromPassword()方法。加密和解密步骤与字符串输入部分中显示的步骤相同。

public static SecretKey getKeyFromPassword(String password, String salt)
      throws NoSuchAlgorithmException, InvalidKeySpecException {
    SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
    KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
    SecretKey secret = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
    return secret;
}

2）密码加密

然后，我们可以使用实例化的密码和提供的密钥来执行加密：

public static String encryptPasswordBased(String plainText, SecretKey key, IvParameterSpec iv)
          throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
          InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        return Base64.getEncoder().encodeToString(cipher.doFinal(plainText.getBytes()));
    }

3）密码解密

然后，我们可以使用实例化的密码和提供的密钥来执行解密：

public static String decryptPasswordBased(String cipherText, SecretKey key, IvParameterSpec iv)
          throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
          InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        return new String(cipher.doFinal(Base64.getDecoder().decode(cipherText)));
    }

4）测试用例

@Test
void givenPassword_whenEncrypt_thenSuccess() 
      throws InvalidKeySpecException, NoSuchAlgorithmException, 
      IllegalBlockSizeException, InvalidKeyException, BadPaddingException, 
      InvalidAlgorithmParameterException, NoSuchPaddingException {
    String plainText = "blog.ntan520.com";
    String password = "test";
    String salt = "12345678";
    IvParameterSpec ivParameterSpec = AESUtil.generateIv();
    SecretKey key = AESUtil.getKeyFromPassword(password, salt);
    String cipherText = AESUtil.encryptPasswordBased(plainText, key, ivParameterSpec);
    String decryptedCipherText = AESUtil.decryptPasswordBased(cipherText, key, ivParameterSpec);
    Assertions.assertEquals(plainText, decryptedCipherText);
}

4、加密对象

为了加密Java对象，我们需要使用SealedObject类。该对象应可序列化。

1）定义学生类Student

让我们从定义学生类开始：

public class Student implements Serializable {
    private String name;
    private int age;

    // standard setters and getters
}

2）加密Student对象

接下来，让我们加密Student对象：

public static SealedObject encryptObject(String algorithm, Serializable object,
      SecretKey key, IvParameterSpec iv) throws NoSuchPaddingException,
      NoSuchAlgorithmException, InvalidAlgorithmParameterException, 
      InvalidKeyException, IOException, IllegalBlockSizeException {
    Cipher cipher = Cipher.getInstance(algorithm);
    cipher.init(Cipher.ENCRYPT_MODE, key, iv);
    SealedObject sealedObject = new SealedObject(object, cipher);
    return sealedObject;
}

3）解密加密的对象

稍后可以使用正确的密码解密加密的对象：

public static Serializable decryptObject(String algorithm, SealedObject sealedObject,
      SecretKey key, IvParameterSpec iv) throws NoSuchPaddingException,
      NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
      ClassNotFoundException, BadPaddingException, IllegalBlockSizeException, IOException {
    Cipher cipher = Cipher.getInstance(algorithm);
    cipher.init(Cipher.DECRYPT_MODE, key, iv);
    Serializable unsealObject = (Serializable) sealedObject.getObject(cipher);
    return unsealObject;
}

4）测试用例

让我们写一个测试用例：

@Test
void givenObject_whenEncrypt_thenSuccess() 
      throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException,
      InvalidAlgorithmParameterException, NoSuchPaddingException, IOException, 
      BadPaddingException, ClassNotFoundException {
    Student student = new Student("test", 20);
    SecretKey key = AESUtil.generateKey(128);
    IvParameterSpec ivParameterSpec = AESUtil.generateIv();
    String algorithm = "AES/CBC/PKCS5Padding";
    SealedObject sealedObject = AESUtil.encryptObject(algorithm, student, key, ivParameterSpec);
    Student object = (Student) AESUtil.decryptObject(algorithm, sealedObject, key, ivParameterSpec);
    assertThat(student).isEqualToComparingFieldByField(object);
}

四、完整源代码

1、AESUtil.java

import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.BadPaddingException;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKeyFactory;
import javax.crypto.SealedObject;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;

public class AESUtil {

    public static String encrypt(String algorithm, String input, SecretKey key, IvParameterSpec iv)
          throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
          InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        byte[] cipherText = cipher.doFinal(input.getBytes());
        return Base64.getEncoder().encodeToString(cipherText);
    }

    public static String decrypt(String algorithm, String cipherText, SecretKey key, IvParameterSpec iv)
          throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
          InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        byte[] plainText = cipher.doFinal(Base64.getDecoder().decode(cipherText));
        return new String(plainText);
    }

    public static SecretKey generateKey(int n) throws NoSuchAlgorithmException {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.init(n);
        SecretKey key = keyGenerator.generateKey();
        return key;
    }

    public static SecretKey getKeyFromPassword(String password, String salt)
          throws NoSuchAlgorithmException, InvalidKeySpecException {
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
        SecretKey secret = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
        return secret;
    }

    public static IvParameterSpec generateIv() {
        byte[] iv = new byte[16];
        new SecureRandom().nextBytes(iv);
        return new IvParameterSpec(iv);
    }

    public static void encryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
          File inputFile, File outputFile) throws IOException, NoSuchPaddingException,
          NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
          BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        FileInputStream inputStream = new FileInputStream(inputFile);
        FileOutputStream outputStream = new FileOutputStream(outputFile);
        byte[] buffer = new byte[64];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byte[] output = cipher.update(buffer, 0, bytesRead);
            if (output != null) {
                outputStream.write(output);
            }
        }
        byte[] outputBytes = cipher.doFinal();
        if (outputBytes != null) {
            outputStream.write(outputBytes);
        }
        inputStream.close();
        outputStream.close();
    }

    public static void decryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
          File encryptedFile, File decryptedFile) throws IOException, NoSuchPaddingException,
          NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
          BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        FileInputStream inputStream = new FileInputStream(encryptedFile);
        FileOutputStream outputStream = new FileOutputStream(decryptedFile);
        byte[] buffer = new byte[64];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byte[] output = cipher.update(buffer, 0, bytesRead);
            if (output != null) {
                outputStream.write(output);
            }
        }
        byte[] output = cipher.doFinal();
        if (output != null) {
            outputStream.write(output);
        }
        inputStream.close();
        outputStream.close();
    }

    public static SealedObject encryptObject(String algorithm, Serializable object, SecretKey key,
          IvParameterSpec iv) throws NoSuchPaddingException, NoSuchAlgorithmException,
          InvalidAlgorithmParameterException, InvalidKeyException, IOException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        SealedObject sealedObject = new SealedObject(object, cipher);
        return sealedObject;
    }

    public static Serializable decryptObject(String algorithm, SealedObject sealedObject, SecretKey key,
          IvParameterSpec iv) throws NoSuchPaddingException, NoSuchAlgorithmException,
          InvalidAlgorithmParameterException, InvalidKeyException, ClassNotFoundException,
          BadPaddingException, IllegalBlockSizeException, IOException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        Serializable unsealObject = (Serializable) sealedObject.getObject(cipher);
        return unsealObject;
    }

    public static String encryptPasswordBased(String plainText, SecretKey key, IvParameterSpec iv)
          throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
          InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        return Base64.getEncoder().encodeToString(cipher.doFinal(plainText.getBytes()));
    }

    public static String decryptPasswordBased(String cipherText, SecretKey key, IvParameterSpec iv)
          throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
          InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        return new String(cipher.doFinal(Base64.getDecoder().decode(cipherText)));
    }
}

2、AESUtilTest.java

import org.assertj.core.api.WithAssertions;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

import javax.crypto.SealedObject;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

class AESUtilTest implements WithAssertions {

    @Test
    void givenString_whenEncrypt_thenSuccess()
          throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException,
          BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
        // given
        String input = "test";
        SecretKey key = AESUtil.generateKey(128);
        IvParameterSpec ivParameterSpec = AESUtil.generateIv();
        String algorithm = "AES/CBC/PKCS5Padding";

        // when
        String cipherText = AESUtil.encrypt(algorithm, input, key, ivParameterSpec);
        String plainText = AESUtil.decrypt(algorithm, cipherText, key, ivParameterSpec);

        // then
        Assertions.assertEquals(input, plainText);
    }

    @Test
    void givenFile_whenEncrypt_thenSuccess()
          throws NoSuchAlgorithmException, IOException, IllegalBlockSizeException, InvalidKeyException,
          BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
        // given
        SecretKey key = AESUtil.generateKey(128);
        String algorithm = "AES/CBC/PKCS5Padding";
        IvParameterSpec ivParameterSpec = AESUtil.generateIv();
        File inputFile = Paths.get("src/test/resources/test.txt")
            .toFile();
        File encryptedFile = new File("classpath:test.encrypted");
        File decryptedFile = new File("document.decrypted");

        // when
        AESUtil.encryptFile(algorithm, key, ivParameterSpec, inputFile, encryptedFile);
        AESUtil.decryptFile(algorithm, key, ivParameterSpec, encryptedFile, decryptedFile);

        // then
        assertThat(inputFile).hasSameTextualContentAs(decryptedFile);
        encryptedFile.delete();
        decryptedFile.delete();
    }

    @Test
    void givenObject_whenEncrypt_thenSuccess()
          throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException,
          InvalidAlgorithmParameterException, NoSuchPaddingException, IOException, BadPaddingException,
          ClassNotFoundException {
        // given
        Student student = new Student("test", 20);
        SecretKey key = AESUtil.generateKey(128);
        IvParameterSpec ivParameterSpec = AESUtil.generateIv();
        String algorithm = "AES/CBC/PKCS5Padding";

        // when
        SealedObject sealedObject = AESUtil.encryptObject(algorithm, student, key, ivParameterSpec);
        Student object = (Student) AESUtil.decryptObject(algorithm, sealedObject, key, ivParameterSpec);

        // then
        assertThat(student).isEqualTo(object);
    }

    @Test
    void givenPassword_whenEncrypt_thenSuccess()
          throws InvalidKeySpecException, NoSuchAlgorithmException, IllegalBlockSizeException,
          InvalidKeyException, BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
        // given
        String plainText = "blog.ntan520.com";
        String password = "test";
        String salt = "12345678";
        IvParameterSpec ivParameterSpec = AESUtil.generateIv();
        SecretKey key = AESUtil.getKeyFromPassword(password, salt);

        // when
        String cipherText = AESUtil.encryptPasswordBased(plainText, key, ivParameterSpec);
        String decryptedCipherText = AESUtil.decryptPasswordBased(cipherText, key, ivParameterSpec);

        // then
        Assertions.assertEquals(plainText, decryptedCipherText);
    }
}

3、Student.java

import java.io.Serializable;
import java.util.Objects;

public class Student implements Serializable {
    private String name;
    private int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;
        Student student = (Student) o;
        return age == student.age && Objects.equals(name, student.name);
    }
}

打赏赞

一	二	三	四	五	六	日
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

Java AES加解密工具类封装

一、AES算法是什么？

二、AES生成密钥的两种方法

1、从随机数生成

2、从给定密码生成

三、AES主要用途

1、加密字符串

1）初始化向量IV

2）对输入字符串进行加密

3）使用初始化密码解密内容

4）测试用例

2、加密文件

1）加密文本文件

2）解密加密文件

3）测试用例

3、基于密码加解密

1）生成密钥

2）密码加密

3）密码解密

4）测试用例

4、加密对象

1）定义学生类Student

2）加密Student对象

3）解密加密的对象

4）测试用例

四、完整源代码

1、AESUtil.java

2、AESUtilTest.java

3、Student.java

发表评论取消回复

技术网站

一、AES算法是什么？

二、AES生成密钥的两种方法

1、从随机数生成

2、从给定密码生成

三、AES主要用途

1、加密字符串

1）初始化向量IV

2）对输入字符串进行加密

3）使用初始化密码解密内容

4）测试用例

2、加密文件

1）加密文本文件

2）解密加密文件

3）测试用例

3、基于密码加解密

1）生成密钥

2）密码加密

3）密码解密

4）测试用例

4、加密对象

1）定义学生类Student

2）加密Student对象

3）解密加密的对象

4）测试用例

四、完整源代码

1、AESUtil.java

2、AESUtilTest.java

3、Student.java

相关文章

发表评论 取消回复

发表评论取消回复