Android/java AES文件加密解密

package com.xy.jx.util;
    
    import android.util.Log;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    
    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    /**
     * Created by xuxiang on 2017/6/10.
     */
    
    public class FileAESUtil {
        /**
         * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
         **/
        private static String sKey = "写入您的加密key";//key，可自行修改
        private static String ivParameter = "写入您的偏移量";//偏移量,可自行修改
        /**
         * 算法/模式/填充
         **/
        private static final String CipherMode = "AES/CBC/PKCS5Padding";
    
    
        /**
         * 加密文件
         * @param readPath  源文件路径
         * @param writePath 加密后文件路径
         */
        public static void setAESFile(String readPath, String writePath) {
            File file = new File(readPath);
            if(!file.exists()) return;
            File writeFile = new File(writePath);
            InputStream inputStream = null;
            OutputStream outputStream = null;
            byte bt[] = new byte[(int) file.length()];
            try {
                if(!writeFile.exists()) writeFile.createNewFile();
    
                inputStream = new FileInputStream(file);
                outputStream = new FileOutputStream(writeFile);
                int byteread = 0;
                // 读入多个字节到字节数组中，byteread为一次读入的字节数
                while ((byteread = inputStream.read(bt)) != -1) {
                    outputStream.write(encrypt(bt));
                    outputStream.flush();
                }
    
                file.delete();
            }catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if(outputStream != null)
                        outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    if (inputStream != null)
                        inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
    
        /**
         * 解密文件
         * @param readPath   源文件路径
         * @param writePath  解密后文件路径
         */
        public static File readAESFile(String readPath, String writePath) {
            File file = new File(readPath);
            if(!file.exists()) return null;
            File writeFile = new File(writePath);
            InputStream inputStream = null;
            OutputStream outputStream = null;
    
            byte bt[] = new byte[(int) file.length()];
            try {
                if(!writeFile.exists()) writeFile.createNewFile();
    
                inputStream = new FileInputStream(file);
                outputStream = new FileOutputStream(writeFile);
                int byteread = 0;
                // 读入多个字节到字节数组中，byteread为一次读入的字节数
                while ((byteread = inputStream.read(bt)) != -1) {
                    byte[] decrypt = decrypt(bt);
                    Log.e("length", "decrypt ======" + decrypt.length);
                    outputStream.write(decrypt);
                    outputStream.flush();
                }
                return writeFile;
            }catch (IOException e) {
                e.printStackTrace();
                return null;
            } finally {
                try {
                    if(outputStream != null)
                        outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    if (inputStream != null)
                        inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    
    
        // 加密
        public static byte[] encrypt(byte[] bytes) {
            try {
                Cipher cipher = Cipher.getInstance(CipherMode);
                byte[] raw = sKey.getBytes();
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
                cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
                byte[] encrypted = cipher.doFinal(bytes);
                return encrypted;
            } catch (Exception ex) {
                Log.e("AES", "加密异常：" + ex.getMessage());
                return null;
            }
        }
    
        // 解密
        public static byte[] decrypt(byte[] bytes) {
            try {
                byte[] raw = sKey.getBytes("ASCII");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance(CipherMode);
                IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
                cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    
                //byte[] encrypted1 = new BASE64Decoder().decodeBuffer(new String(bytes, "utf-8"));// 先用base64解密
                byte[] original = cipher.doFinal(bytes);
                return original;
            } catch (Exception ex) {
                Log.e("AES", "解密异常：" + ex.getMessage());
                return null;
            }
        }
    }

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