Rfc2898DeriveBytes解密如何通过java实现

这个找了半天，还是不太懂，密码一点不懂，直接上来问了
Rfc2898DeriveBytes对应的是PBKDF2WithHmacSHA1，Rfc2898DeriveBytes默认的迭代次数为1000，剩下的不知道了

以下为C#代码
C# code
public byte[] DecryptData(byte[] data)
{
AesManaged managed = null;
MemoryStream stream = null;
CryptoStream stream2 = null;
try
{
Rfc2898DeriveBytes bytes = new Rfc2898DeriveBytes(this.fPassword, this.Salt);
managed = new AesManaged();
managed.set_Key(bytes.GetBytes(managed.get_KeySize() / 8));
managed.set_IV(bytes.GetBytes(managed.get_BlockSize() / 8));
stream = new MemoryStream();
stream2 = new CryptoStream(stream, managed.CreateDecryptor(), 1);
stream2.Write(data, 0, data.Length);
stream2.FlushFinalBlock();
return stream.ToArray();
}
catch
{
return data;
}
}

通过以下代码无法实现解密
Java code
public byte[] dePBE(byte[] data){
try {
char[] password = this.fPassword.toCharArray();
byte[] salt = this.fSalt;

KeySpec spec = new PBEKeySpec(password,salt,1000,128);
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
SecretKey tmp = factory.generateSecret(spec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(new byte[cipher.getBlockSize()]));
byte[] ciphertext = cipher.doFinal(data);
return ciphertext;
}catch (Exception e) {
e.printStackTrace();
return null;
}
}

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

/**
* RFC 2898 password derivation compatible with .NET Rfc2898DeriveBytes class.
*/
public class Rfc2898DeriveBytes {

private Mac _hmacSha1;
private byte[] _salt;
private int _iterationCount;

private byte[] _buffer = new byte[20];
private int _bufferStartIndex = 0;
private int _bufferEndIndex = 0;
private int _block = 1;

/**
* Creates new instance.
* @param password The password used to derive the key.
* @param salt The key salt used to derive the key.
* @param iterations The number of iterations for the operation.
* @throws NoSuchAlgorithmException HmacSHA1 algorithm cannot be found.
* @throws InvalidKeyException Salt must be 8 bytes or more. -or- Password cannot be null.
*/
public Rfc2898DeriveBytes(byte[] password, byte[] salt, int iterations) throws NoSuchAlgorithmException, InvalidKeyException {
if ((salt == null) || (salt.length < 8)) { throw new InvalidKeyException("Salt must be 8 bytes or more."); }
if (password == null) { throw new InvalidKeyException("Password cannot be null."); }
this._salt = salt;
this._iterationCount = iterations;
this._hmacSha1 = Mac.getInstance("HmacSHA1");
this._hmacSha1.init(new SecretKeySpec(password, "HmacSHA1"));
}

/**
* Creates new instance.
* @param password The password used to derive the key.
* @param salt The key salt used to derive the key.
* @param iterations The number of iterations for the operation.
* @throws NoSuchAlgorithmException HmacSHA1 algorithm cannot be found.
* @throws InvalidKeyException Salt must be 8 bytes or more. -or- Password cannot be null.
* @throws UnsupportedEncodingException UTF-8 encoding is not supported.
*/
public Rfc2898DeriveBytes(String password, byte[] salt, int iterations) throws InvalidKeyException, NoSuchAlgorithmException, UnsupportedEncodingException  {
this(password.getBytes("UTF8"), salt, iterations);
}

/**
* Creates new instance.
* @param password The password used to derive the key.
* @param salt The key salt used to derive the key.
* @throws NoSuchAlgorithmException HmacSHA1 algorithm cannot be found.
* @throws InvalidKeyException Salt must be 8 bytes or more. -or- Password cannot be null.
* @throws UnsupportedEncodingException UTF-8 encoding is not supported.
*/
public Rfc2898DeriveBytes(String password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeyException, UnsupportedEncodingException {
this(password, salt, 0x3e8);
}

/**
* Returns a pseudo-random key from a password, salt and iteration count.
* @param count Number of bytes to return.
* @return Byte array.
*/
public byte[] getBytes(int count) {
byte[] result = new byte[count];
int resultOffset = 0;
int bufferCount = this._bufferEndIndex - this._bufferStartIndex;

if (bufferCount > 0) { //if there is some data in buffer
if (count < bufferCount) { //if there is enough data in buffer
System.arraycopy(this._buffer, this._bufferStartIndex, result, 0, count);
this._bufferStartIndex += count;
return result;
}
System.arraycopy(this._buffer, this._bufferStartIndex, result, 0, bufferCount);
this._bufferStartIndex = this._bufferEndIndex = 0;
resultOffset += bufferCount;
}

while (resultOffset < count) {
int needCount = count - resultOffset;
this._buffer = this.func();
if (needCount > 20) { //we one (or more) additional passes
System.arraycopy(this._buffer, 0, result, resultOffset, 20);
resultOffset += 20;
} else {
System.arraycopy(this._buffer, 0, result, resultOffset, needCount);
this._bufferStartIndex = needCount;
this._bufferEndIndex = 20;
return result;
}
}
return result;
}

private byte[] func() {
this._hmacSha1.update(this._salt, 0, this._salt.length);
byte[] tempHash = this._hmacSha1.doFinal(getBytesFromInt(this._block));

this._hmacSha1.reset();
byte[] finalHash = tempHash;
for (int i = 2; i <= this._iterationCount; i++) {
tempHash = this._hmacSha1.doFinal(tempHash);
for (int j = 0; j < 20; j++) {
finalHash[j] = (byte)(finalHash[j] ^ tempHash[j]);
}
}
if (this._block == 2147483647) {
this._block = -2147483648;
} else {
this._block += 1;
}

return finalHash;
}

private static byte[] getBytesFromInt(int i) {
return new byte[] { (byte)(i >>> 24), (byte)(i >>> 16), (byte)(i >>> 8), (byte)i };
}

}

只要这样就可可以解决了

Java code

public byte[] deRfc2898DeriveBytes(byte[] data,String fPassword,byte[] fSalt){
Rfc2898DeriveBytes keyGenerator = null;
try {
keyGenerator = new Rfc2898DeriveBytes(fPassword, fSalt, 1000);
}
catch (InvalidKeyException e1) {
e1.printStackTrace();
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace();
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
//Log.i("key = ", decodeUTF8(keyGenerator.getBytes(16)));

byte[] bKey = keyGenerator.getBytes(32);
byte[] bIv = keyGenerator.getBytes(16);

try {
SecretKeySpec sekey = new SecretKeySpec(bKey, "AES");
AlgorithmParameterSpec param = new IvParameterSpec(bIv);

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE,sekey,param);
byte[] decrypted = cipher.doFinal(data);
return decrypted;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}