Android 文件压缩与加密策略

Question

没有找到 winRar 的密码策略，这个完全是自己拍脑袋的

Answer 1

恩 最近在搞这个玩意  不过加密后的zip文件 不能被winRar 识别，只能用自己的程序解密，本来是想做成通用格式的

Answer 2

if (pwd == null) {
return;
} else {
byte[] bytepass = pwd.getBytes();
FileInputStream fs = new FileInputStream(t_file);
FileOutputStream out = new FileOutputStream(file);
if (fs != null) {
int filelen = fs.available();
byte[] real = new byte[filelen];
fs.read(real, 0, filelen);

SecretKeyFactory keyfac = SecretKeyFactory.getInstance("DES");
byte[] keydata;
keydata = bytepass;
DESKeySpec keySp = new DESKeySpec(keydata);
Key key = keyfac.generateSecret(keySp);

Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = cipher.doFinal(real);

byte[] all  = new byte[cipherText.length + bytepass.length];
System.arraycopy(bytepass, 0, all, 0, bytepass.length);

System.arraycopy(cipherText,0, all, bytepass.length, cipherText.length); out.write(all);
}
fs.close();
out.close();

Answer 3

if (pwd == null) {
return;
} 
else {
byte[] bytepass = pwd.getBytes();

FileInputStream fs = new FileInputStream(sec_file);
FileOutputStream out = new FileOutputStream(zipfile);
if (fs != null) {
int filelen = fs.available();
byte[] all = new byte[filelen];
fs.read(all, 0, filelen);
System.arraycopy(all, 0, bytepass, 0, bytepass.length); byte[] real = new byte[filelen-bytepass.length];
System.arraycopy(all, bytepass.length, real, 0, real.length);

SecretKeyFactory keyfac = SecretKeyFactory.getInstance("DES");
byte[] keydata;
keydata = bytepass;
DESKeySpec keySp = new DESKeySpec(keydata);
Key key = keyfac.generateSecret(keySp);

Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] cipherText = cipher.doFinal(real);


out.write(cipherText);
}
fs.close();
out.close();