Android(安卓)AES Encryption and Decryption
1. EncryptUtil
import android.util.Base64;import java.security.InvalidParameterException;import java.security.spec.AlgorithmParameterSpec;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;/** * AES encryption and decryption * * 1. key's length >= 16 * 2. iv's length > 16 * 3. "transformation": AES/CBC/PKCS5Padding * 4. iv=12(bytes) length=128(bits) * 5. iv=24(bytes) length=192(bits) * 6. iv=32(bytes) length=256(bits) *
* Created by Anter on 2018/4/11. */public class EncryptUtil { private EncryptUtil() { } /** * Base64 decode then AES decrypt * * @param data Data to decrypt * @param key Decrypt key * @param iv Decrypt key * @param transformation AES/CBC/PKCS5Padding * @return Decrypted bytes * @throws Exception Decrypt exception */ public static byte[] decryptBase64EncodeData(byte[] data, byte[] key, byte[] iv, String transformation) throws Exception { if (data == null || data.length == 0 || key == null || key.length < 16 || iv == null || iv.length < 16 || transformation == null || transformation.length() == 0) { throw (new InvalidParameterException()); } byte[] textBytes = Base64.decode(data, Base64.DEFAULT); AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv); SecretKeySpec newKey = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance(transformation); cipher.init(Cipher.DECRYPT_MODE, newKey, ivSpec); return cipher.doFinal(textBytes); } /** * AES encrypt then base64 decode * * @param data Data to encrypt * @param key Encrypt key * @param iv Encrypt key * @param transformation AES/CBC/PKCS5Padding * @return Encrypted bytes * @throws Exception Encrypt exception */ public static byte[] encryptAndBase64Encode(byte[] data, byte[] key, byte[] iv, String transformation) throws Exception { if (data == null || data.length == 0 || key == null || key.length == 0 || iv == null || iv.length == 0 || transformation == null || transformation.length() == 0) { throw (new InvalidParameterException()); } AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv); SecretKeySpec newKey = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance(transformation); cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec); return Base64.encode(cipher.doFinal(data), Base64.DEFAULT); }}
2. Usage
import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import java.util.Arrays;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.aes_btn_encryption).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { } }); findViewById(R.id.aes_btn_decryption).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { } }); // Unsupported key size: 15 bytes // expected IV length of 16 but was 8 try { String originalString = "Hello"; byte[] encryptedData = EncryptUtil.encryptAndBase64Encode(originalString.getBytes(), "1234567812345678".getBytes(), "1234567812345678".getBytes(), "AES/CBC/PKCS5Padding"); byte[] decryptedData = EncryptUtil.decryptBase64EncodeData(encryptedData, "1234567812345678".getBytes(), "1234567812345678".getBytes(), "AES/CBC/PKCS5Padding"); String decryptedString = new String(decryptedData); String encryptedString = new String(encryptedData); if (Arrays.equals(encryptedData, encryptedData)) { Log.d("MainActivity", "onCreate: Good job!"); } Log.d("MainActivity", "originalString = " + originalString + ", decryptedString = " + decryptedString + ", encryptedString = " + encryptedString); } catch (Exception e) { e.printStackTrace(); } }}3. 小解
Android AES加密时加密的key和iv(bytes)的长度需要>= 16- 加密位数要求
iv(bytes)的长度：16 =>128, 24 => 192, 32 => 256
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