Kuangcp/JavaBase

package security.aes;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SealedObject;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;

public class AESUtil {

    public static String encrypt(String algorithm, String input, SecretKey key, IvParameterSpec iv)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        byte[] cipherText = cipher.doFinal(input.getBytes());
        return Base64.getEncoder().encodeToString(cipherText);
    }

    public static String decrypt(String algorithm, String cipherText, SecretKey key, IvParameterSpec iv)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        byte[] plainText = cipher.doFinal(Base64.getDecoder().decode(cipherText));
        return new String(plainText);
    }

    /**
     * @see  com.sun.crypto.provider.AESCrypt#isKeySizeValid 16 24 32 字节
     */
    public static SecretKey generateKey(int bit) throws NoSuchAlgorithmException {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.init(bit);
        return keyGenerator.generateKey();
    }

    public static SecretKey getKeyFromPassword(String password, String salt)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
        KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
        return new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
    }

    public static String generateIvByte() {
        byte[] iv = new byte[16];
        new SecureRandom().nextBytes(iv);
        final byte[] encode = Base64.getEncoder().encode(iv);
        return new String(encode);
    }

    public static IvParameterSpec generateIv(String base64) {
        final byte[] iv = Base64.getDecoder().decode(base64);
        return new IvParameterSpec(iv);
    }

    /**
     * 初始向量长度必须等于16字节
     */
    public static IvParameterSpec generateIv() {
        byte[] iv = new byte[16];
        new SecureRandom().nextBytes(iv);
        return new IvParameterSpec(iv);
    }

    public static void encryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
                                   File inputFile, File outputFile) throws IOException, NoSuchPaddingException,
            NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
            BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        FileInputStream inputStream = new FileInputStream(inputFile);
        FileOutputStream outputStream = new FileOutputStream(outputFile);
        byte[] buffer = new byte[64];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byte[] output = cipher.update(buffer, 0, bytesRead);
            if (output != null) {
                outputStream.write(output);
            }
        }
        byte[] outputBytes = cipher.doFinal();
        if (outputBytes != null) {
            outputStream.write(outputBytes);
        }
        inputStream.close();
        outputStream.close();
    }

    public static void decryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
                                   File encryptedFile, File decryptedFile) throws IOException, NoSuchPaddingException,
            NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
            BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        FileInputStream inputStream = new FileInputStream(encryptedFile);
        FileOutputStream outputStream = new FileOutputStream(decryptedFile);
        byte[] buffer = new byte[64];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byte[] output = cipher.update(buffer, 0, bytesRead);
            if (output != null) {
                outputStream.write(output);
            }
        }
        byte[] output = cipher.doFinal();
        if (output != null) {
            outputStream.write(output);
        }
        inputStream.close();
        outputStream.close();
    }

    public static SealedObject encryptObject(String algorithm, Serializable object, SecretKey key,
                                             IvParameterSpec iv) throws NoSuchPaddingException, NoSuchAlgorithmException,
            InvalidAlgorithmParameterException, InvalidKeyException, IOException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        return new SealedObject(object, cipher);
    }

    public static Serializable decryptObject(String algorithm, SealedObject sealedObject, SecretKey key,
                                             IvParameterSpec iv) throws NoSuchPaddingException, NoSuchAlgorithmException,
            InvalidAlgorithmParameterException, InvalidKeyException, ClassNotFoundException,
            BadPaddingException, IllegalBlockSizeException, IOException {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        return (Serializable) sealedObject.getObject(cipher);
    }

    public static String encryptPasswordBased(String plainText, SecretKey key, IvParameterSpec iv)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);
        return Base64.getEncoder().encodeToString(cipher.doFinal(plainText.getBytes()));
    }

    public static String decryptPasswordBased(String cipherText, SecretKey key, IvParameterSpec iv)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        return new String(cipher.doFinal(Base64.getDecoder().decode(cipherText)));
    }

}