package eu.siacs.conversations.entities; import android.util.Log; 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.MimeUtils; public class DownloadableFile extends File { private static final long serialVersionUID = 2247012619505115863L; private long expectedSize = 0; private String sha1sum; private Key aeskey; private String mime; 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) { if (this.expectedSize == 0) { return 0; } else { return (this.expectedSize / 16 + 1) * 16; } } else { return this.expectedSize; } } public String getMimeType() { String path = this.getAbsolutePath(); int start = path.lastIndexOf('.') + 1; if (start < path.length()) { String mime = MimeUtils.guessMimeTypeFromExtension(path.substring(start)); return mime == null ? "" : mime; } else { return ""; } } 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 == 48) { byte[] secretKey = new byte[32]; byte[] iv = new byte[16]; System.arraycopy(key, 0, iv, 0, 16); System.arraycopy(key, 16, secretKey, 0, 32); this.aeskey = new SecretKeySpec(secretKey, "AES"); this.iv = iv; } else 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"); } } 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(this.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; } } } }