AES加密和解密写法文件
AES加密和解密写法文件
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;
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;
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);
}
AES加密 AES加密和解密写法文件和解密写法文件
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