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Merge pull request #10234 from hmdrzsharifi/BAEL-4460 

BAEL-4460: Java AES encryption and decryption
This commit is contained in:
Jonathan Cook 2020-11-30 14:20:28 +01:00 committed by GitHub
parent c88f1c7a28 a8b42068a9
commit eed264e2e4
5 changed files with 300 additions and 1 deletions
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2
core-java-modules/core-java-security-2/pom.xml
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@ -53,7 +53,7 @@
<commons-codec.version>1.11</commons-codec.version>
<!-- testing -->
<assertj-core.version>3.10.0</assertj-core.version>
<assertj-core.version>3.18.0</assertj-core.version>
<jaxb-api.version>2.3.1</jaxb-api.version>
</properties>

156
core-java-modules/core-java-security-2/src/main/java/com/baeldung/aes/AESUtil.java Normal file
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package com.baeldung.aes;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.BadPaddingException;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKeyFactory;
import javax.crypto.SealedObject;
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);
}
public static SecretKey generateKey(int n) throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(n);
SecretKey key = keyGenerator.generateKey();
return key;
}
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);
SecretKey secret = new SecretKeySpec(factory.generateSecret(spec)
.getEncoded(), "AES");
return secret;
}
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);
SealedObject sealedObject = new SealedObject(object, cipher);
return sealedObject;
}
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);
Serializable unsealObject = (Serializable) sealedObject.getObject(cipher);
return unsealObject;
}
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)));
}
}

40
core-java-modules/core-java-security-2/src/main/java/com/baeldung/aes/Student.java Normal file
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package com.baeldung.aes;
import java.io.Serializable;
import java.util.Objects;
public class Student implements Serializable {
private String name;
private int age;
public Student(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
Student student = (Student) o;
return age == student.age && Objects.equals(name, student.name);
}
}

101
core-java-modules/core-java-security-2/src/test/java/com/baeldung/aes/AESUtilUnitTest.java Normal file
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package com.baeldung.aes;
import org.assertj.core.api.WithAssertions;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import javax.crypto.SealedObject;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
class AESUtilUnitTest implements WithAssertions {
@Test
void givenString_whenEncrypt_thenSuccess()
throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException,
BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
// given
String input = "baeldung";
SecretKey key = AESUtil.generateKey(128);
IvParameterSpec ivParameterSpec = AESUtil.generateIv();
String algorithm = "AES/CBC/PKCS5Padding";
// when
String cipherText = AESUtil.encrypt(algorithm, input, key, ivParameterSpec);
String plainText = AESUtil.decrypt(algorithm, cipherText, key, ivParameterSpec);
// then
Assertions.assertEquals(input, plainText);
}
@Test
void givenFile_whenEncrypt_thenSuccess()
throws NoSuchAlgorithmException, IOException, IllegalBlockSizeException, InvalidKeyException,
BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
// given
SecretKey key = AESUtil.generateKey(128);
String algorithm = "AES/CBC/PKCS5Padding";
IvParameterSpec ivParameterSpec = AESUtil.generateIv();
File inputFile = Paths.get("src/test/resources/baeldung.txt")
.toFile();
File encryptedFile = new File("classpath:baeldung.encrypted");
File decryptedFile = new File("document.decrypted");
// when
AESUtil.encryptFile(algorithm, key, ivParameterSpec, inputFile, encryptedFile);
AESUtil.decryptFile(algorithm, key, ivParameterSpec, encryptedFile, decryptedFile);
// then
assertThat(inputFile).hasSameTextualContentAs(decryptedFile);
encryptedFile.delete();
decryptedFile.delete();
}
@Test
void givenObject_whenEncrypt_thenSuccess()
throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException,
InvalidAlgorithmParameterException, NoSuchPaddingException, IOException, BadPaddingException,
ClassNotFoundException {
// given
Student student = new Student("Baeldung", 20);
SecretKey key = AESUtil.generateKey(128);
IvParameterSpec ivParameterSpec = AESUtil.generateIv();
String algorithm = "AES/CBC/PKCS5Padding";
// when
SealedObject sealedObject = AESUtil.encryptObject(algorithm, student, key, ivParameterSpec);
Student object = (Student) AESUtil.decryptObject(algorithm, sealedObject, key, ivParameterSpec);
// then
assertThat(student).isEqualTo(object);
}
@Test
void givenPassword_whenEncrypt_thenSuccess()
throws InvalidKeySpecException, NoSuchAlgorithmException, IllegalBlockSizeException,
InvalidKeyException, BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException {
// given
String plainText = "www.baeldung.com";
String password = "baeldung";
String salt = "12345678";
IvParameterSpec ivParameterSpec = AESUtil.generateIv();
SecretKey key = AESUtil.getKeyFromPassword(password, salt);
// when
String cipherText = AESUtil.encryptPasswordBased(plainText, key, ivParameterSpec);
String decryptedCipherText = AESUtil.decryptPasswordBased(cipherText, key, ivParameterSpec);
// then
Assertions.assertEquals(plainText, decryptedCipherText);
}
}

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core-java-modules/core-java-security-2/src/test/resources/baeldung.txt Normal file
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@ -0,0 +1,2 @@
Hello Baeldung
This is AES file encryption sample