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AES encryption in Java, equivalent of Crypt ( Encrypter.php class ) on Laravel (PHP)
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| import android.util.Base64; | |
| import android.util.Log; | |
| import com.google.gson.Gson; | |
| import org.apache.commons.codec.binary.Hex; | |
| import java.io.UnsupportedEncodingException; | |
| import java.security.GeneralSecurityException; | |
| import java.security.Key; | |
| import java.util.Arrays; | |
| import javax.crypto.Cipher; | |
| import javax.crypto.Mac; | |
| import javax.crypto.SecretKey; | |
| import javax.crypto.spec.IvParameterSpec; | |
| import javax.crypto.spec.SecretKeySpec; | |
| public class AesEncryptDecrypt | |
| { | |
| public static String encrypt(byte[] keyValue, String plaintext) throws Exception { | |
| Key key = new SecretKeySpec(keyValue, "AES"); | |
| //serialize | |
| String serializedPlaintext = "s:" + plaintext.getBytes().length + ":\"" + plaintext + "\";"; | |
| byte[] plaintextBytes = serializedPlaintext.getBytes("UTF-8"); | |
| Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding"); | |
| c.init(Cipher.ENCRYPT_MODE, key); | |
| byte[] iv = c.getIV(); | |
| byte[] encVal = c.doFinal(plaintextBytes); | |
| String encryptedData = Base64.encodeToString(encVal, Base64.NO_WRAP); | |
| SecretKeySpec macKey = new SecretKeySpec(keyValue, "HmacSHA256"); | |
| Mac hmacSha256 = Mac.getInstance("HmacSHA256"); | |
| hmacSha256.init(macKey); | |
| hmacSha256.update(Base64.encode(iv, Base64.NO_WRAP)); | |
| byte[] calcMac = hmacSha256.doFinal(encryptedData.getBytes("UTF-8")); | |
| String mac = new String(Hex.encodeHex(calcMac)); | |
| //Log.d("MAC",mac); | |
| AesEncryptionData aesData = new AesEncryptionData( | |
| Base64.encodeToString(iv, Base64.NO_WRAP), | |
| encryptedData, | |
| mac); | |
| String aesDataJson = new Gson().toJson(aesData); | |
| return Base64.encodeToString(aesDataJson.getBytes("UTF-8"), Base64.DEFAULT); | |
| } | |
| public static String decrypt(byte[] keyValue, String ivValue, String encryptedData, String macValue) throws Exception { | |
| Key key = new SecretKeySpec(keyValue, "AES"); | |
| byte[] iv = Base64.decode(ivValue.getBytes("UTF-8"), Base64.DEFAULT); | |
| byte[] decodedValue = Base64.decode(encryptedData.getBytes("UTF-8"), Base64.DEFAULT); | |
| SecretKeySpec macKey = new SecretKeySpec(keyValue, "HmacSHA256"); | |
| Mac hmacSha256 = Mac.getInstance("HmacSHA256"); | |
| hmacSha256.init(macKey); | |
| hmacSha256.update(ivValue.getBytes("UTF-8")); | |
| byte[] calcMac = hmacSha256.doFinal(encryptedData.getBytes("UTF-8")); | |
| byte[] mac = Hex.decodeHex(macValue.toCharArray()); | |
| if (!Arrays.equals(calcMac, mac)) | |
| return "MAC mismatch"; | |
| Cipher c = Cipher.getInstance("AES/CBC/PKCS7Padding"); // or PKCS5Padding | |
| c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv)); | |
| byte[] decValue = c.doFinal(decodedValue); | |
| int firstQuoteIndex = 0; | |
| while (decValue[firstQuoteIndex] != (byte) '"') firstQuoteIndex++; | |
| return new String(Arrays.copyOfRange(decValue, firstQuoteIndex + 1, decValue.length - 2)); | |
| } | |
| } |
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| /** | |
| * Created by Kushtrim on 06.10.2015. | |
| */ | |
| public class AesEncryptionData { | |
| public String iv; | |
| public String value; | |
| public String mac; | |
| public AesEncryptionData(String iv, String value, String mac) { | |
| this.iv = iv; | |
| this.value = value; | |
| this.mac = mac; | |
| } | |
| } |
@nasznjoka
When you encrypt a text with Crypt in Laravel, you get a base64 string.
To decrypt,decode that base64, and you get a JSON object like the AesEncryptionData class above. Then proceed with the decrypt method.
Could you please give an example in use? How to use the App_Key from Laravel in this class?
How can I decrypt a string from Laravle with this?
If I want to use decrypt with sample word in java and Println the result..
how do i know byte[] keyValue, String ivValue, String encryptedData, String macValue for method decrypt?
@madita did you find a way to do that? please share.
Hi @madita , @mr648 .
I checked the code from my old project. Here's a further example:
public static String getDecryptedString(String encryptedString) {
String aesDataString = new String(Base64.decode(encryptedString.getBytes(), Base64.DEFAULT));
AesEncryptedData aesEncryptedData = new Gson().fromJson(aesDataString, AesEncryptedData.class);
String decrypted = null;
try {
decrypted = decrypt(
SECRET_KEY.getBytes("UTF-8"),
aesEncryptedData.iv,
aesEncryptedData.value,
aesEncryptedData.mac
);
} catch (Exception e) {
e.printStackTrace();
}
return decrypted;
}
how to call method decrypt?
Do we need to pass IvParameterSpec in c.init(Cipher.ENCRYPT_MODE, key); as last parameter?
Can get that for the jquery version or PHP version?
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how do you use it? what is iv, value and mac