android sqlite3设置密码,Android SQlite password encryption?

I use apache commons Base64 for encoding the encrypted password. You end up storing the password in the db as a Blob.

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import org.apache.commons.net.util.Base64;

private static SecretKey key;

try {

byte[] secretBytes = "secret key".getBytes("UTF8");

DESKeySpec keySpec = new DESKeySpec(secretBytes);

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

key = keyFactory.generateSecret(keySpec);

} catch (Exception e) {

Log.e(Flashum.LOG_TAG, "DatabaseHelper " + e.toString());

}

public byte[] encryptPassword(String userpw) {

try {

byte[] cleartext = userpw.getBytes("UTF8");

Cipher cipher = Cipher.getInstance("DES");

cipher.init(Cipher.ENCRYPT_MODE, key);

byte[] clearBytes = cipher.doFinal(cleartext);

byte[] encryptedPwd = Base64.encodeBase64(clearBytes);

return encryptedPwd;

} catch (Exception e) {

Log.e(Flashum.LOG_TAG, "DatabaseHelper " + e.toString());

}

return null;

}

public String decryptPassword(byte[] userpw) {

String pw = "";

try {

byte[] encrypedPwdBytes = Base64.decodeBase64(userpw);

Cipher cipher = Cipher.getInstance("DES");

cipher.init(Cipher.DECRYPT_MODE, key);

byte[] plainTextPwdBytes = cipher.doFinal(encrypedPwdBytes);

pw = new String(plainTextPwdBytes, "UTF8");

} catch (Exception e) {

Log.e(Flashum.LOG_TAG, "DatabaseHelper " + e.toString());

}

return pw;

}