我试图做加密,并使用DES算法进行解密。对于enryption我没有问题,并成功地将明文转换为字节数组。但是我无法将密文解密为正常的明文。我认为我的解密方法有一些问题。在这里我的编码解密DES算法方法不好填充
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;
public class FileEncryption {
//Initial Vector
public static final byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
//EncryptAndDecrypt String -> Input : PlainText + Return : CipherText+DecipherText
public static String encryptString(String src) throws Exception
{
String dst="";
//Not Input!
if(src == null || src.length()==0)
return "";
//Encryption Setting
byte[] k="Multimediaproces".getBytes();
SecretKeySpec Key = new SecretKeySpec(k,"AES");
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher encryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
encryptCipher.init(Cipher.ENCRYPT_MODE,Key,ivspec);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
CipherOutputStream cout = new CipherOutputStream(baos,encryptCipher);
cout.write(src.getBytes());
cout.flush(); //ByteOutputStream -> Write Encryption Text
cout.close();
dst = DatatypeConverter.printHexBinary(baos.toByteArray());
return dst;
}
//String src -> EncryptedData
public static String decryptString(String src) throws Exception
{
//src value is Encrypted Value!
//So, src value -> Not Byte!
//String dst="";
byte[] encryptedBytes = src.getBytes();
//Not Input!
if(src == null || src.length()==0)
return "";
//Decryption Setting
IvParameterSpec ivspec = new IvParameterSpec(iv);
byte[] k="Multimediaproces".getBytes();
SecretKeySpec Key = new SecretKeySpec(k,"AES");
Cipher decryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
decryptCipher.init(Cipher.DECRYPT_MODE,Key,ivspec);
//ByteArrayOutputStream baos = new ByteArrayOutputStream();
ByteArrayInputStream bais = new ByteArrayInputStream(encryptedBytes);
CipherInputStream cin = new CipherInputStream(bais,decryptCipher);
//CipherOutputStream cout = new CipherOutputStream(baos,decryptCipher);
//cout.write(src.getBytes());
byte[] buf = new byte[1024];
int read;
while((read=cin.read(buf))>=0) //reading encrypted data!
{
cin.read(buf,0,read); //writing decrypted data!
//read = cin.read(buf);
}
// closing streams
//baos.write(decryptCipher.doFinal());
//return baos.toString();
//cin.close();
return bais.toString();
}
}
当我运行的代码 error messages
不要在新的代码中使用DES,它是不是安全的,并通过AES已被取代。也不要使用静态IV,使用随机IV并将其加到解密期间使用的加密数据中。 – zaph
您使用'getBytes()'但不指定编码,以便您可以获得UTF-16或UTF-8,指定编码。而是使用'getBytes(“UTF-8”)'。 – zaph
那么我应该如何解决它?你能给我一些代码吗 – noobie