Java源码实现的文件加密解密算法
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简介：
本项目提供基于Java语言实现的一套高效安全的文件加密与解密解决方案，采用先进的加密算法确保数据的安全传输和存储。
文件加密解密算法（Java源码）
```java
package com.crypto.encrypt;
import java.security.SecureRandom;
import java.io.*;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.Cipher;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
public class EncryptData {
private String keyfile = null;
public EncryptData() {}
public EncryptData(String keyfile) { this.keyfile = keyfile; }
/**
* 加密文件
*
* @param filename 源路径
* @param filenamekey 加密后的路径
*/
public void createEncryptData(String filename, String filenamekey)
throws IllegalStateException, IllegalBlockSizeException,
BadPaddingException, NoSuchPaddingException, InvalidKeySpecException,
NoSuchAlgorithmException, InvalidKeyException, IOException {
// 验证 keyfile 是否有效
if (keyfile == null || keyfile.equals()) { throw new NullPointerException(无效的密钥文件路径); }
encryptData(filename, filenamekey);
}
/**
* 加密类文件
*
* @param filename 原始类文件名
* @param encryptfile 加密后的类文件名
*/
private void encryptData(String filename, String encryptfile)
throws IOException, InvalidKeyException,
NoSuchAlgorithmException, InvalidKeySpecException,
NoSuchPaddingException, BadPaddingException,
IllegalBlockSizeException {
byte[] data = Util.readFile(filename);
// 执行加密操作
byte[] encryptedClassData = getencryptData(data);
// 保存加密后的文件，覆盖原有的类文件。
Util.writeFile(encryptedClassData, encryptfile);
}
/**
* 直接获得加密数据
*
* @param bytes 原始字节数组
*/
public byte[] createEncryptData(byte[] bytes)
throws IllegalStateException, IllegalBlockSizeException,
BadPaddingException, InvalidKeyException,
NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeySpecException {
bytes = getencryptData(bytes);
return bytes;
}
private byte[] getencryptData(byte[] bytes)
throws IOException, ClassNotFoundException,
SecurityException, NoSuchMethodException,
InvocationTargetException, IllegalAccessException,
InstantiationException, NoSuchAlgorithmException,
InvalidKeySpecException, NoSuchPaddingException,
BadPaddingException, IllegalBlockSizeException {
// 产生一个可信任的随机数源
SecureRandom sr = new SecureRandom();
byte[] rawKeyData = Util.readFile(keyfile);
Class classkeyspec = Class.forName(Util.getValue(keyspec));
Constructor constructor = classkeyspec.getConstructor(byte[].class);
KeySpec dks = (KeySpec) constructor.newInstance(rawKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(Util.getAlgorithm());
SecretKey key = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(Util.getAlgorithm());
// 用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, key, sr);
bytes = cipher.doFinal(bytes);
return bytes;
}
/**
* 设置key文件路径
*
* @param keyfile 密钥文件名
*/
public void setKeyFile(String keyfile) { this.keyfile = keyfile; }
}
```
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