Encrypt in java and Decrypt in C# For AES 256 bit

Encrypt in java and Decrypt in C# For AES 256 bit

To achieve this, you'll need to use compatible libraries and options in both languages. Here is a sample implementation in Java for encryption, and C# for decryption, using AES 256-bit encryption with CBC mode and PKCS5Padding.

  • Java Encryption:
import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import java.nio.charset.StandardCharsets; import java.security.SecureRandom; import java.util.Base64; public class Main { public static void main(String[] args) throws Exception { String plaintext = "Hello, World!"; String secretKey = "YourSecretKeyHereYourSecretKeyHere"; // 32 characters for AES-256 byte[] encrypted = encrypt(plaintext, secretKey); String base64Encrypted = Base64.getEncoder().encodeToString(encrypted); System.out.println("Encrypted: " + base64Encrypted); } public static byte[] encrypt(String plaintext, String secretKey) throws Exception { byte[] iv = new byte[16]; new SecureRandom().nextBytes(iv); IvParameterSpec ivParameterSpec = new IvParameterSpec(iv); SecretKey secretKeySpec = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec); byte[] encrypted = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8)); // Combine IV and encrypted part for easier decryption on C# side byte[] combined = new byte[iv.length + encrypted.length]; System.arraycopy(iv, 0, combined, 0, iv.length); System.arraycopy(encrypted, 0, combined, iv.length, encrypted.length); return combined; } }
  • C# Decryption:
using System; using System.IO; using System.Security.Cryptography; using System.Text; namespace AesEncryption { class Program { static void Main(string[] args) { string base64Encrypted = "<EncryptedDataFromJava>"; // Replace with the output from the Java encryption code string secretKey = "YourSecretKeyHereYourSecretKeyHere"; // Same 32-character key as used in Java byte[] encrypted = Convert.FromBase64String(base64Encrypted); string decrypted = Decrypt(encrypted, secretKey); Console.WriteLine("Decrypted: " + decrypted); } public static string Decrypt(byte[] encrypted, string secretKey) { using AesManaged aes = new AesManaged(); aes.KeySize = 256; aes.BlockSize = 128; aes.Mode = CipherMode.CBC; aes.Padding = PaddingMode.PKCS7; byte[] iv = new byte[16]; Array.Copy(encrypted, 0, iv, 0, iv.Length); aes.IV = iv; byte[] encryptedData = new byte[encrypted.Length - iv.Length]; Array.Copy(encrypted, iv.Length, encryptedData, 0, encryptedData.Length); aes.Key = Encoding.UTF8.GetBytes(secretKey); using MemoryStream ms = new MemoryStream(); using CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(encryptedData, 0, encryptedData.Length); cs.Close(); byte[] decryptedBytes = ms.ToArray(); return Encoding.UTF8.GetString(decryptedBytes); } } }

Examples

  1. "AES 256-bit encryption in Java"

    • Java Code Implementation:

      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKey = new SecretKeySpec("yourSecretKey".getBytes(), "AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKey); byte[] encryptedBytes = cipher.doFinal("Hello, World!".getBytes());

    • Description: Demonstrates how to perform AES 256-bit encryption in Java using the Cipher class.

  2. "Java AES encryption with Base64 encoding"

    • Java Code Implementation:

      byte[] encodedBytes = Base64.getEncoder().encode(encryptedBytes);

    • Description: Illustrates how to encode the encrypted bytes using Base64 in Java for compatibility with C# decoding.

  3. "AES 256-bit decryption in C#"

    • C# Code Implementation:

      using (Aes aesAlg = Aes.Create()) { aesAlg.Key = Encoding.UTF8.GetBytes("yourSecretKey"); aesAlg.IV = new byte[16]; // Initialization Vector, should be shared between Java and C# using (MemoryStream msDecrypt = new MemoryStream(encodedBytes)) using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV), CryptoStreamMode.Read)) using (StreamReader srDecrypt = new StreamReader(csDecrypt)) { string decryptedText = srDecrypt.ReadToEnd(); Console.WriteLine(decryptedText); } }

    • Description: Demonstrates how to perform AES 256-bit decryption in C# using the Aes class.

  4. "C# AES decryption from Base64 encoded string"

    • C# Code Implementation:

      byte[] encryptedBytes = Convert.FromBase64String("Base64EncodedStringFromJava");

    • Description: Illustrates how to decode the Base64 encoded string received from Java before performing AES decryption in C#.

  5. "AES encryption in Java with CBC mode"

    • Java Code Implementation:

      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); IvParameterSpec ivParameterSpec = new IvParameterSpec(new byte[16]); // Initialization Vector cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivParameterSpec);

    • Description: Shows how to use Cipher Block Chaining (CBC) mode for AES encryption in Java.

  6. "AES CBC decryption in C#"

    • C# Code Implementation:

      using (Aes aesAlg = Aes.Create()) { aesAlg.Mode = CipherMode.CBC; // Rest of the decryption code remains the same }

    • Description: Modifies the C# decryption code to use Cipher Block Chaining (CBC) mode, matching the Java encryption configuration.

  7. "AES encryption with password in Java"

    • Java Code Implementation:

      char[] password = "yourPassword".toCharArray(); SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256"); KeySpec spec = new PBEKeySpec(password, salt, 65536, 256); SecretKey secretKey = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");

    • Description: Demonstrates how to derive a key from a password using PBKDF2 in Java for AES encryption.

  8. "AES encryption with password in C#"

    • C# Code Implementation:

      using (Rfc2898DeriveBytes keyDerivation = new Rfc2898DeriveBytes("yourPassword", salt, 65536)) { aesAlg.Key = keyDerivation.GetBytes(32); // 256 bits }

    • Description: Modifies the C# encryption code to derive a key from a password using PBKDF2, matching the Java encryption configuration.

  9. "AES encryption in Java with different key sizes"

    • Java Code Implementation:

      KeyGenerator keyGen = KeyGenerator.getInstance("AES"); keyGen.init(256); // Set key size to 256 bits SecretKey secretKey = keyGen.generateKey();

    • Description: Illustrates how to specify different key sizes for AES encryption in Java.

  10. "AES decryption in C# with different key sizes"

    • C# Code Implementation:

      using (Aes aesAlg = Aes.Create()) { aesAlg.KeySize = 256; // Set key size to 256 bits // Rest of the decryption code remains the same }

    • Description: Modifies the C# decryption code to handle different key sizes for AES decryption, matching the Java encryption configuration.

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