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package eu.siacs.conversations.entities;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.utils.CryptoHelper;
import android.util.Log;
public class DownloadableFile extends File {
private static final long serialVersionUID = 2247012619505115863L;
private long expectedSize = 0;
private String sha1sum;
private Key aeskey;
private byte[] iv = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0xf };
public DownloadableFile(String path) {
super(path);
}
public long getSize() {
return super.length();
}
public long getExpectedSize() {
if (this.aeskey != null) {
return (this.expectedSize / 16 + 1) * 16;
} else {
return this.expectedSize;
}
}
public void setExpectedSize(long size) {
this.expectedSize = size;
}
public String getSha1Sum() {
return this.sha1sum;
}
public void setSha1Sum(String sum) {
this.sha1sum = sum;
}
public void setKey(byte[] key) {
if (key.length >= 32) {
byte[] secretKey = new byte[32];
System.arraycopy(key, 0, secretKey, 0, 32);
this.aeskey = new SecretKeySpec(secretKey, "AES");
} else if (key.length >= 16) {
byte[] secretKey = new byte[16];
System.arraycopy(key, 0, secretKey, 0, 16);
this.aeskey = new SecretKeySpec(secretKey, "AES");
} else {
Log.d(Config.LOGTAG, "weird key");
}
Log.d(Config.LOGTAG,
"using aes key "
+ CryptoHelper.bytesToHex(this.aeskey.getEncoded()));
}
public Key getKey() {
return this.aeskey;
}
public InputStream createInputStream() {
if (this.getKey() == null) {
try {
return new FileInputStream(this);
} catch (FileNotFoundException e) {
return null;
}
} else {
try {
IvParameterSpec ips = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, this.getKey(), ips);
Log.d(Config.LOGTAG, "opening encrypted input stream");
return new CipherInputStream(new FileInputStream(this), cipher);
} catch (NoSuchAlgorithmException e) {
Log.d(Config.LOGTAG, "no such algo: " + e.getMessage());
return null;
} catch (NoSuchPaddingException e) {
Log.d(Config.LOGTAG, "no such padding: " + e.getMessage());
return null;
} catch (InvalidKeyException e) {
Log.d(Config.LOGTAG, "invalid key: " + e.getMessage());
return null;
} catch (InvalidAlgorithmParameterException e) {
Log.d(Config.LOGTAG, "invavid iv:" + e.getMessage());
return null;
} catch (FileNotFoundException e) {
return null;
}
}
}
public OutputStream createOutputStream() {
if (this.getKey() == null) {
try {
return new FileOutputStream(this);
} catch (FileNotFoundException e) {
return null;
}
} else {
try {
IvParameterSpec ips = new IvParameterSpec(iv);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, this.getKey(), ips);
Log.d(Config.LOGTAG, "opening encrypted output stream");
return new CipherOutputStream(new FileOutputStream(this),
cipher);
} catch (NoSuchAlgorithmException e) {
Log.d(Config.LOGTAG, "no such algo: " + e.getMessage());
return null;
} catch (NoSuchPaddingException e) {
Log.d(Config.LOGTAG, "no such padding: " + e.getMessage());
return null;
} catch (InvalidKeyException e) {
Log.d(Config.LOGTAG, "invalid key: " + e.getMessage());
return null;
} catch (InvalidAlgorithmParameterException e) {
Log.d(Config.LOGTAG, "invavid iv:" + e.getMessage());
return null;
} catch (FileNotFoundException e) {
return null;
}
}
}
}
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