84 lines
2.9 KiB
Java
84 lines
2.9 KiB
Java
package database;
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import java.util.Base64;
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import java.util.Random;
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import javax.crypto.*;
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import javax.crypto.spec.*;
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import java.security.*;
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import java.security.spec.*;
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class SQLiteEncprytion {
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private static final Random RANDOM = new SecureRandom();
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private static final int ITERATIONS = 10000;
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private static final int KEY_LENGTH = 256;
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protected static final String encryptAlgorithm = "AES/CBC/PKCS5Padding";
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protected static byte[] getNextSalt() {
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byte[] salt = new byte[24];
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RANDOM.nextBytes(salt);
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return salt;
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}
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protected static byte[] hash(char[] password, byte[] salt) {
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return SQLiteEncprytion.getKey(password, salt).getEncoded();
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}
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protected static SecretKey getKey(char[] password, byte[] salt) {
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PBEKeySpec saltpwd = new PBEKeySpec(password, salt, ITERATIONS, KEY_LENGTH);
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try {
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SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
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SecretKey tmp = skf.generateSecret(saltpwd);
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SecretKey key = new SecretKeySpec(tmp.getEncoded(), "AES");
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return key;
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} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
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e.printStackTrace();
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} finally {
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saltpwd.clearPassword();
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}
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return null;
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}
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public static IvParameterSpec generateIv() {
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byte[] iv = new byte[16];
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new SecureRandom().nextBytes(iv);
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return new IvParameterSpec(iv);
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}
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protected static byte[] encrypt(String algorithm, byte[] input, SecretKey key, IvParameterSpec iv) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException{
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Cipher cipher = Cipher.getInstance(algorithm);
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cipher.init(Cipher.ENCRYPT_MODE, key, iv);
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byte[] cipherText = cipher.doFinal(input);
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return Base64.getEncoder().encode(cipherText);
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}
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protected static byte[] decryptByte(String algorithm, byte[] cipherText, SecretKey key, IvParameterSpec iv) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException{
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Cipher cipher = Cipher.getInstance(algorithm);
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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byte[] plainText = cipher.doFinal(Base64.getDecoder().decode(cipherText));
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return plainText;
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}
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protected static String decryptString(String algorithm, byte[] cipherText, SecretKey key, IvParameterSpec iv) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
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return new String(SQLiteEncprytion.decryptByte(algorithm, cipherText, key, iv) );
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}
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public static byte[] keyToByte(SecretKey key) {
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return Base64.getEncoder().encode(key.getEncoded());
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}
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public static SecretKey byteToKey(byte[] encodedKey) {
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byte[] decodedKey = Base64.getDecoder().decode(encodedKey);
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return new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
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}
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}
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