Crypto js similar to c sharp, Port crypto-js AES functions to C#,Cryptojs equivalent in c#

Crypto js similar to c sharp, Port crypto-js AES functions to C#, Symmetric and asymmetric encryption using c# example

In this Article we will discuss about Encryption and decryption technique using c#

Port crypto-js AES functions to C#

Here's a simple example of how you might use CryptoJS for hashing a string using SHA-256

If we want to encryption or decryption using crypto.js then use do this by following way.

  public class Protection { public static string OpenSSLEncrypt(string plainText, string passphrase) { // generate salt byte[] key, iv; byte[] salt = new byte[8]; RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(); rng.GetNonZeroBytes(salt); DeriveKeyAndIV(passphrase, salt, out key, out iv); // encrypt bytes byte[] encryptedBytes = EncryptStringToBytesAes(plainText, key, iv); // add salt as first 8 bytes byte[] encryptedBytesWithSalt = new byte[salt.Length + encryptedBytes.Length + 8]; Buffer.BlockCopy(Encoding.ASCII.GetBytes("Salted__"), 0, encryptedBytesWithSalt, 0, 8); Buffer.BlockCopy(salt, 0, encryptedBytesWithSalt, 8, salt.Length); Buffer.BlockCopy(encryptedBytes, 0, encryptedBytesWithSalt, salt.Length + 8, encryptedBytes.Length); // base64 encode return Convert.ToBase64String(encryptedBytesWithSalt); }

public static string OpenSSLDecrypt(string encrypted, string passphrase) { // base 64 decode byte[] encryptedBytesWithSalt = Convert.FromBase64String(encrypted); // extract salt (first 8 bytes of encrypted) byte[] salt = new byte[8]; byte[] encryptedBytes = new byte[encryptedBytesWithSalt.Length - salt.Length - 8]; Buffer.BlockCopy(encryptedBytesWithSalt, 8, salt, 0, salt.Length); Buffer.BlockCopy(encryptedBytesWithSalt, salt.Length + 8, encryptedBytes, 0, encryptedBytes.Length); // get key and iv byte[] key, iv; DeriveKeyAndIV(passphrase, salt, out key, out iv); return DecryptStringFromBytesAes(encryptedBytes, key, iv); }

private static void DeriveKeyAndIV(string passphrase, byte[] salt, out byte[] key, out byte[] iv) { // generate key and iv List<byte> concatenatedHashes = new List<byte>(48); byte[] password = Encoding.UTF8.GetBytes(passphrase); byte[] currentHash = new byte[0]; MD5 md5 = MD5.Create(); bool enoughBytesForKey = false; while (!enoughBytesForKey) { int preHashLength = currentHash.Length + password.Length + salt.Length; byte[] preHash = new byte[preHashLength]; Buffer.BlockCopy(currentHash, 0, preHash, 0, currentHash.Length); Buffer.BlockCopy(password, 0, preHash, currentHash.Length, password.Length); Buffer.BlockCopy(salt, 0, preHash, currentHash.Length + password.Length, salt.Length); currentHash = md5.ComputeHash(preHash); concatenatedHashes.AddRange(currentHash); if (concatenatedHashes.Count >= 48) enoughBytesForKey = true; } key = new byte[32]; iv = new byte[16]; concatenatedHashes.CopyTo(0, key, 0, 32); concatenatedHashes.CopyTo(32, iv, 0, 16); md5.Clear(); md5 = null; }

static byte[] EncryptStringToBytesAes(string plainText, byte[] key, byte[] iv) { // Check arguments. if (plainText == null || plainText.Length <= 0) throw new ArgumentNullException("plainText"); if (key == null || key.Length <= 0) throw new ArgumentNullException("key"); if (iv == null || iv.Length <= 0) throw new ArgumentNullException("iv"); // Declare the stream used to encrypt to an in memory // array of bytes. MemoryStream msEncrypt; // Declare the RijndaelManaged object // used to encrypt the data. RijndaelManaged aesAlg = null; try { // Create a RijndaelManaged object // with the specified key and IV. aesAlg = new RijndaelManaged { Mode = CipherMode.CBC, KeySize = 256, BlockSize = 128, Key = key, IV = iv }; // Create an encryptor to perform the stream transform. ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV); // Create the streams used for encryption. msEncrypt = new MemoryStream(); using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) { using (StreamWriter swEncrypt = new StreamWriter(csEncrypt)) { //Write all data to the stream. swEncrypt.Write(plainText); swEncrypt.Flush(); swEncrypt.Close(); } } } finally { // Clear the RijndaelManaged object. if (aesAlg != null) aesAlg.Clear(); } // Return the encrypted bytes from the memory stream. return msEncrypt.ToArray(); }

static string DecryptStringFromBytesAes(byte[] cipherText, byte[] key, byte[] iv) { // Check arguments. if (cipherText == null || cipherText.Length <= 0) throw new ArgumentNullException("cipherText"); if (key == null || key.Length <= 0) throw new ArgumentNullException("key"); if (iv == null || iv.Length <= 0) throw new ArgumentNullException("iv"); // Declare the RijndaelManaged object // used to decrypt the data. RijndaelManaged aesAlg = null; // Declare the string used to hold // the decrypted text. string plaintext; try { // Create a RijndaelManaged object // with the specified key and IV. aesAlg = new RijndaelManaged { Mode = CipherMode.CBC, KeySize = 256, BlockSize = 128, Key = key, IV = iv }; // Create a decrytor to perform the stream transform. ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV); // Create the streams used for decryption. using (MemoryStream msDecrypt = new MemoryStream(cipherText)) { using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) { using (StreamReader srDecrypt = new StreamReader(csDecrypt)) { // Read the decrypted bytes from the decrypting stream // and place them in a string. plaintext = srDecrypt.ReadToEnd(); srDecrypt.Close(); } } } } finally { // Clear the RijndaelManaged object. if (aesAlg != null) aesAlg.Clear(); } return plaintext; } }

Crypto js similar to c sharp

Finally Call this method in main

using SymmetricEncryptionWithKey.Helper;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace SymmetricEncryptionWithKey

{

    public class Program

    {

        static void Main(string[] args)

        {

            var key = "12345";

            Console.WriteLine("Please enter a string for encryption");

            var str = Console.ReadLine();

            var encryptedString = Protection.OpenSSLEncrypt(str, key);

            Console.WriteLine($"encrypted string: = {encryptedString}");

            var decryptedString = Protection.OpenSSLDecrypt(encryptedString, key);

            Console.WriteLine($"decrypted string: = {decryptedString}");

            Console.ReadKey();

        }

    }

}