我想知道如何加密最终上传到保管箱的文件或照片。
由于我在网上进行了研究,只找到了这个代码(粘贴在底部),它只加密密码,但我想知道如何加密最终上传到保管箱的文件或照片。
那么有没有关于如何编写使用三重 DES 加密文件的 java 编程(将在 Eclipse 软件上使用)的引用、帮助或指南?太感谢了。
package com.kushal.utils;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DESEncryption {
private static final String UNICODE_FORMAT = "UTF8";
public static final String DES_ENCRYPTION_SCHEME = "DES";
private KeySpec myKeySpec;
private SecretKeyFactory mySecretKeyFactory;
private Cipher cipher;
byte[] keyAsBytes;
private String myEncryptionKey;
private String myEncryptionScheme;
SecretKey key;
public DESEncryption() throws Exception
{
myEncryptionKey = "ThisIsSecretEncryptionKey";
myEncryptionScheme = DES_ENCRYPTION_SCHEME;
keyAsBytes = myEncryptionKey.getBytes(UNICODE_FORMAT);
myKeySpec = new DESKeySpec(keyAsBytes);
mySecretKeyFactory = SecretKeyFactory.getInstance(myEncryptionScheme);
cipher = Cipher.getInstance(myEncryptionScheme);
key = mySecretKeyFactory.generateSecret(myKeySpec);
}
/**
* Method To Encrypt The String
*/
public String encrypt(String unencryptedString) {
String encryptedString = null;
try {
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] plainText = unencryptedString.getBytes(UNICODE_FORMAT);
byte[] encryptedText = cipher.doFinal(plainText);
BASE64Encoder base64encoder = new BASE64Encoder();
encryptedString = base64encoder.encode(encryptedText);
} catch (Exception e) {
e.printStackTrace();
}
return encryptedString;
}
/**
* Method To Decrypt An Ecrypted String
*/
public String decrypt(String encryptedString) {
String decryptedText=null;
try {
cipher.init(Cipher.DECRYPT_MODE, key);
BASE64Decoder base64decoder = new BASE64Decoder();
byte[] encryptedText = base64decoder.decodeBuffer(encryptedString);
byte[] plainText = cipher.doFinal(encryptedText);
decryptedText= bytes2String(plainText);
} catch (Exception e) {
e.printStackTrace();
}
return decryptedText;
}
/**
* Returns String From An Array Of Bytes
*/
private static String bytes2String(byte[] bytes) {
StringBuffer stringBuffer = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
stringBuffer.append((char) bytes[i]);
}
return stringBuffer.toString();
}
/**
* Testing the DES Encryption And Decryption Technique
*/
public static void main(String args []) throws Exception
{
DESEncryption myEncryptor= new DESEncryption();
String stringToEncrypt="Sanjaal.com";
String encrypted=myEncryptor.encrypt(stringToEncrypt);
String decrypted=myEncryptor.decrypt(encrypted);
System.out.println("String To Encrypt: "+stringToEncrypt);
System.out.println("Encrypted Value :" + encrypted);
System.out.println("Decrypted Value :"+decrypted);
}
}
最佳答案
文件读取取自here
public static byte[] encryptFile(String pFilePath, byte[] pKey) throws GeneralSecurityException, IOException
{
File file = new File(pFilePath);
long length = file.length();
InputStream is = new FileInputStream(file);
// You cannot create an array using a long type.
// It needs to be an int type.
// Before converting to an int type, check
// to ensure that file is not larger than Integer.MAX_VALUE.
if (length > Integer.MAX_VALUE) {
// File is too large
}
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}
// Close the input stream and return bytes
is.close();
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely read file "+file.getName());
}
SecretKeyFactory lDESedeKeyFactory = SecretKeyFactory.getInstance("DESede");
SecretKey kA = lDESedeKeyFactory.generateSecret(new DESedeKeySpec(pKey));
IvParameterSpec lIVSpec = new IvParameterSpec(new byte[8]);
Cipher desedeCBCCipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
desedeCBCCipher.init(Cipher.ENCRYPT_MODE, kA, lIVSpec);
byte[] encrypted = desedeCBCCipher.doFinal(bytes);
return encrypted;
}
关于java - 如何使用三重 DES 加密照片/文件? (将上传至投递箱),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11898139/