所以我正在为自己的个人项目工作,我正在尝试加密手机上的文件.这些文件可以是任何文件,照片等.现在我试图让这个工作正常.当我运行加密时,它似乎正常工作并加密文件.当我运行解密时,有时它的工作,其他时候它不.当它失败时,我通常得到一个“错误,而最终确定密码,垫块损坏”错误.我也没有使用不同的测试文件,所以它不像一些文件工作,而其他文件没有.这是我每次尝试的两个文件.
public static void encryptfile(String path,String Pass) throws IOException,NoSuchAlgorithmException,NoSuchPaddingException,InvalidKeyException {
FileInputStream fis = new FileInputStream(path);
FileOutputStream fos = new FileOutputStream(path.concat(".crypt"));
byte[] key = (salt + Pass).getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key,16);
SecretKeySpec sks = new SecretKeySpec(key,"AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE,sks);
CipherOutputStream cos = new CipherOutputStream(fos,cipher);
int b;
byte[] d = new byte[8];
while((b = fis.read(d)) != -1) {
cos.write(d,b);
}
cos.flush();
cos.close();
fis.close();
}
public static void decrypt(String path,InvalidKeyException {
FileInputStream fis = new FileInputStream(path);
FileOutputStream fos = new FileOutputStream(path.replace(".crypt",""));
byte[] key = (salt + Pass).getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key,"AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE,sks);
CipherInputStream cis = new CipherInputStream(fis,cipher);
int b;
byte[] d = new byte[8];
while((b = cis.read(d)) != -1) {
fos.write(d,b);
}
fos.flush();
fos.close();
cis.close();
}
目前,Salt和Password是静态的,为了测试目的不要改变.一半的时间仍然会出错.
有没有人有什么想法为什么会发生这种情况？我一直在寻找,我已经找到了几件事情尝试,没有一个工作.我已经考虑了以下解决方案的以下问题：
Android decryption: Error while finalizing cipher
Encryption error on Android 4.2
Decrypting error : “no iv set when one expected”
How to handle “last block incomplete in decryption”
Encryption and decryption of image file
Tips on encryption/decryption of images in java using AES
任何帮助是极大的赞赏！我想我只是想念一些简单的东西
更新！
当盐是正确的时候.当我删除盐,问题解决了…有一点挖掘,结果盐通过是问题,但因为盐是一个字节[],而且是一个字符串.我把salt改成了String,然后用salt.concat(pass),问题解决了！
解决方法
也许我错过了一些东西,但在我身边没有任何问题.
可以尝试以下类简单的更改fileToBeCrypted,fileToBeDecrypted和fileDecryptedOutput变量吗？
可以尝试以下类简单的更改fileToBeCrypted,fileToBeDecrypted和fileDecryptedOutput变量吗？
package test;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
public class TestCrypt{
private static final String salt = "t784";
private static final String cryptPassword = "873147cbn9x5'2 79'79314";
private static final String fileToBeCrypted = "c:\\Temp\\sampleFile.conf";
private static final String fileToBeDecrypted = "c:\\Temp\\sampleFile.conf.crypt";
private static final String fileDecryptedOutput = "c:\\Temp\\sampleFile.conf.decrypted";
public static void main(String[] args) throws Exception
{
for (int i=0; i<100; i++)
{
encryptfile(fileToBeCrypted,cryptPassword);
decrypt(fileToBeDecrypted,cryptPassword,fileDecryptedOutput);
System.out.println(i);
}
}
public static void encryptfile(String path,String password) throws IOException,InvalidKeyException {
FileInputStream fis = new FileInputStream(path);
FileOutputStream fos = new FileOutputStream(path.concat(".crypt"));
byte[] key = (salt + password).getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key,16);
SecretKeySpec sks = new SecretKeySpec(key,"AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE,sks);
CipherOutputStream cos = new CipherOutputStream(fos,cipher);
int b;
byte[] d = new byte[8];
while((b = fis.read(d)) != -1) {
cos.write(d,b);
}
cos.flush();
cos.close();
fis.close();
}
public static void decrypt(String path,String password,String outPath) throws IOException,InvalidKeyException {
FileInputStream fis = new FileInputStream(path);
FileOutputStream fos = new FileOutputStream(outPath);
byte[] key = (salt + password).getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key,"AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE,sks);
CipherInputStream cis = new CipherInputStream(fis,cipher);
int b;
byte[] d = new byte[8];
while((b = cis.read(d)) != -1) {
fos.write(d,b);
}
fos.flush();
fos.close();
cis.close();
}
}
我可以迭代多次没有错误！
我正在使用Oracle JDK 1.8,但是以1.7兼容模式运行.
希望这能帮助你.
再见皮耶罗
