Merge pull request #10234 from hmdrzsharifi/BAEL-4460
BAEL-4460: Java AES encryption and decryption
This commit is contained in:
Jonathan Cook
GitHub
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package com.baeldung.aes;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.BadPaddingException;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.SealedObject;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.Serializable;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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import java.util.Base64;
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public class AESUtil {
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public static String encrypt(String algorithm, String input, SecretKey key, IvParameterSpec iv)
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throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
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InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
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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.getBytes());
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return Base64.getEncoder()
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.encodeToString(cipherText);
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}
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public static String decrypt(String algorithm, String cipherText, SecretKey key, IvParameterSpec iv)
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throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
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InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
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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()
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.decode(cipherText));
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return new String(plainText);
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}
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public static SecretKey generateKey(int n) throws NoSuchAlgorithmException {
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KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
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keyGenerator.init(n);
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SecretKey key = keyGenerator.generateKey();
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return key;
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}
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public static SecretKey getKeyFromPassword(String password, String salt)
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throws NoSuchAlgorithmException, InvalidKeySpecException {
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SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
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KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
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SecretKey secret = new SecretKeySpec(factory.generateSecret(spec)
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.getEncoded(), "AES");
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return secret;
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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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public static void encryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
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File inputFile, File outputFile) throws IOException, NoSuchPaddingException,
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NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
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BadPaddingException, IllegalBlockSizeException {
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Cipher cipher = Cipher.getInstance(algorithm);
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cipher.init(Cipher.ENCRYPT_MODE, key, iv);
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FileInputStream inputStream = new FileInputStream(inputFile);
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FileOutputStream outputStream = new FileOutputStream(outputFile);
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byte[] buffer = new byte[64];
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int bytesRead;
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while ((bytesRead = inputStream.read(buffer)) != -1) {
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byte[] output = cipher.update(buffer, 0, bytesRead);
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if (output != null) {
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outputStream.write(output);
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}
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}
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byte[] outputBytes = cipher.doFinal();
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if (outputBytes != null) {
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outputStream.write(outputBytes);
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}
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inputStream.close();
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outputStream.close();
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}
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public static void decryptFile(String algorithm, SecretKey key, IvParameterSpec iv,
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File encryptedFile, File decryptedFile) throws IOException, NoSuchPaddingException,
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NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException,
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BadPaddingException, IllegalBlockSizeException {
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Cipher cipher = Cipher.getInstance(algorithm);
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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FileInputStream inputStream = new FileInputStream(encryptedFile);
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FileOutputStream outputStream = new FileOutputStream(decryptedFile);
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byte[] buffer = new byte[64];
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int bytesRead;
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while ((bytesRead = inputStream.read(buffer)) != -1) {
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byte[] output = cipher.update(buffer, 0, bytesRead);
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if (output != null) {
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outputStream.write(output);
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}
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}
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byte[] output = cipher.doFinal();
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if (output != null) {
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outputStream.write(output);
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}
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inputStream.close();
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outputStream.close();
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}
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public static SealedObject encryptObject(String algorithm, Serializable object, SecretKey key,
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IvParameterSpec iv) throws NoSuchPaddingException, NoSuchAlgorithmException,
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InvalidAlgorithmParameterException, InvalidKeyException, IOException, IllegalBlockSizeException {
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Cipher cipher = Cipher.getInstance(algorithm);
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cipher.init(Cipher.ENCRYPT_MODE, key, iv);
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SealedObject sealedObject = new SealedObject(object, cipher);
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return sealedObject;
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}
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public static Serializable decryptObject(String algorithm, SealedObject sealedObject, SecretKey key,
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IvParameterSpec iv) throws NoSuchPaddingException, NoSuchAlgorithmException,
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InvalidAlgorithmParameterException, InvalidKeyException, ClassNotFoundException,
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BadPaddingException, IllegalBlockSizeException, IOException {
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Cipher cipher = Cipher.getInstance(algorithm);
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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Serializable unsealObject = (Serializable) sealedObject.getObject(cipher);
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return unsealObject;
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}
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public static String encryptPasswordBased(String plainText, SecretKey key, IvParameterSpec iv)
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throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
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InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
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cipher.init(Cipher.ENCRYPT_MODE, key, iv);
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return Base64.getEncoder()
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.encodeToString(cipher.doFinal(plainText.getBytes()));
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}
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public static String decryptPasswordBased(String cipherText, SecretKey key, IvParameterSpec iv)
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throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
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InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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return new String(cipher.doFinal(Base64.getDecoder()
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.decode(cipherText)));
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}
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}
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@@ -0,0 +1,40 @@
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package com.baeldung.aes;
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import java.io.Serializable;
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import java.util.Objects;
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public class Student implements Serializable {
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private String name;
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private int age;
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public Student(String name, int age) {
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o)
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return true;
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if (o == null || getClass() != o.getClass())
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return false;
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Student student = (Student) o;
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return age == student.age && Objects.equals(name, student.name);
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}
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}
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