java按行讀取檔案並對檔案進行加密和解密
package com.alibaba.datax.plugin.reader.selfxmlfilereader.util;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* 加密/解密工具
* @author lkm
* @date 2018年9月17日 上午10:52:36
*/
public class EncryptUtil {
public static String PASSWORK = “12345678”;
/**
* 加密
* @param content 需要加密的內容
* @param password 加密密碼
*/
public static byte[] encrypt(String content, String password){
try {
KeyGenerator kgen = KeyGenerator.getInstance(“AES”);
SecureRandom random = SecureRandom.getInstance(“SHA1PRNG”);
random.setSeed(password.getBytes());
kgen.init(128, random);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, “AES”);
Cipher cipher = Cipher.getInstance(“AES”);// 建立密碼器
byte[] byteContent = content.getBytes(“utf-8”);
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(byteContent);
return result; // 加密
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}catch (NoSuchPaddingException e) {
e.printStackTrace();
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
}catch (InvalidKeyException e) {
e.printStackTrace();
}catch (IllegalBlockSizeException e) {
e.printStackTrace();
}catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/** * 解密 * @param content 待解密內容 * @param password 解密金鑰 */ public static byte[] decrypt(byte[] content, String password){ try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG"); random.setSeed(password.getBytes()); kgen.init(128, random); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES");// 建立密碼器 cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 byte[] result = cipher.doFinal(content); return result; // 解密 } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }catch (NoSuchPaddingException e) { e.printStackTrace(); }catch (InvalidKeyException e) { e.printStackTrace(); }catch (IllegalBlockSizeException e) { e.printStackTrace(); }catch (BadPaddingException e) { e.printStackTrace(); } return null; } /** * 將二進位制轉換成16進位制 * @method parseByte2HexStr * @param buf */ public static String parseByte2HexStr(byte buf[]){ StringBuffer sb = new StringBuffer(); for(int i = 0; i < buf.length; i++){ String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } /** * 將16進位制轉換為二進位制 * @method parseHexStr2Byte * @param hexStr */ public static byte[] parseHexStr2Byte(String hexStr){ if(hexStr.length() < 1) return null; byte[] result = new byte[hexStr.length()/2]; for (int i = 0;i< hexStr.length()/2; i++) { int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16); int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16); result[i] = (byte) (high * 16 + low); } return result; } /** * @method main * @param args * @throws * @since v1.0 */ public static void main(String[] args) { String content = "加密的內容"; byte[] encryptResult = encrypt(content, PASSWORK);//加密 String encryptResultStr = parseByte2HexStr(encryptResult); System.out.println("加密後:" + encryptResultStr); byte[] decryptFrom = parseHexStr2Byte(encryptResultStr); byte[] decryptResult = decrypt(decryptFrom,PASSWORK);//解碼 System.out.println("解密後:" + new String(decryptResult)); }
}