AES加密和解密写法文件

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AES加密和解密写法文件

[Java] 纯文本查看 复制代码

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
 
/**
 * 
 * @author Ylca   2017-05-12   
 * 
 */
public class AES{
 
    /**
     * 加密字符串
     * 
     * @param content 需要加密的内容
     * @param password 密码
     * @return
     */
    public static byte[] encrypt(String content, String sKey) {
        try {
            // 初始化 加密器
            Cipher cipher = initAESCipher(sKey, Cipher.ENCRYPT_MODE);
            byte[] byteContent = content.getBytes("utf-8");
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    /**
     * 解密字符串
     * 
     * @param content 
     * @param password
     * @return
     */
    public static byte[] decrypt(byte[] content, String sKey) {
        try {
            // 初始化 加密器
            Cipher cipher = initAESCipher(sKey, Cipher.DECRYPT_MODE);
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    /**
     * 对文件进行AES加密
     * 
     * @param sourceFile
     * @param fileType
     * @param sKey
     * @return
     */
    public static File encryptFile(File sourceFile, File encrypfile, String sKey) {
 
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = new FileInputStream(sourceFile);
 
            outputStream = new FileOutputStream(encrypfile);
            Cipher cipher = initAESCipher(sKey, Cipher.ENCRYPT_MODE);
            // 以加密流写入文件
            CipherInputStream cipherInputStream = new CipherInputStream(
                    inputStream, cipher);
            byte[] cache = new byte[1024];
            int nRead = 0;
            while ((nRead = cipherInputStream.read(cache)) != -1) {
                outputStream.write(cache, 0, nRead);
                outputStream.flush();
            }
            cipherInputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace(); // To change body of catch statement use File |
                                    // Settings | File Templates.
        } catch (IOException e) {
            e.printStackTrace(); // To change body of catch statement use File |
                                    // Settings | File Templates.
        } finally {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace(); // To change body of catch statement use
                                        // File | Settings | File Templates.
            }
            try {
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace(); // To change body of catch statement use
                                        // File | Settings | File Templates.
            }
        }
        return encrypfile;
    }
 
 
    /**
     *  AES方式解密文件
     * @param sourceFile 要解密的文件路径
     * @param decryptFile 解密后的文件路径
     * @param sKey
     * @return
     */
    public static File decryptFile(File sourceFile, File decryptFile,
            String sKey) {
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            Cipher cipher = initAESCipher(sKey, Cipher.DECRYPT_MODE);
            inputStream = new FileInputStream(sourceFile);
            outputStream = new FileOutputStream(decryptFile);
            CipherOutputStream cipherOutputStream = new CipherOutputStream(
                    outputStream, cipher);
            byte[] buffer = new byte[1024];
            int r;
            while ((r = inputStream.read(buffer)) >= 0) {
                cipherOutputStream.write(buffer, 0, r);
            }
            cipherOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace(); // To change body of catch statement use File |
                                    // Settings | File Templates.
        } finally {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace(); // To change body of catch statement use
                                        // File | Settings | File Templates.
            }
            try {
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace(); // To change body of catch statement use
                                        // File | Settings | File Templates.
            }
        }
        return decryptFile;
    }
 
    /**
     * 初始化 AES Cipher
     * 
     * @param sKey
     * @param cipherMode
     * @return
     */
    public static Cipher initAESCipher(String sKey, int cipherMode) {
        // 创建Key gen
        KeyGenerator keyGenerator = null;
        Cipher cipher = null;
        try {
            keyGenerator = KeyGenerator.getInstance("AES");
            keyGenerator.init(128, new SecureRandom(sKey.getBytes()));
            SecretKey secretKey = keyGenerator.generateKey();
            byte[] codeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(codeFormat, "AES");
            cipher = Cipher.getInstance("AES");
            // 初始化
            cipher.init(cipherMode, key);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace(); // To change body of catch statement use File |
                                    // Settings | File Templates.
        } catch (NoSuchPaddingException e) {
            e.printStackTrace(); // To change body of catch statement use File |
                                    // Settings | File Templates.
        } catch (InvalidKeyException e) {
            e.printStackTrace(); // To change body of catch statement use File |
                                    // Settings | File Templates.
        }
        return cipher;
    }
 
    public static void main(String[] args) throws Exception {
         
        String cKey = "00b09e37363e596e1f25b23c78e49939238b";
        //未加密文件路径
        File oldfile = new File("C:\\Users\\Administrator\\Desktop\\1.mp4");
        //加密后的文件路径
        File encrypfile = new File("C:\\Users\\Administrator\\Desktop\\encryp.mp4");
        //解密后的文件路径
        File decrypfile  = new File("C:\\Users\\Administrator\\Desktop\\decryp.mp4");
        //加密文件
        encryptFile(oldfile,encrypfile,cKey);
        //解密文件
        decryptFile(encrypfile, decrypfile,cKey);
 
    }

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AES加密 AES加密和解密写法文件和解密写法文件