Encryption/Decryption

For Encrypted Data below algorithm has to used: SHA2 Method

C#

public string EncryptText(string input)
        {
            // Get the bytes of the string
            byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(input);
            byte[] passwordBytes = Encoding.UTF8.GetBytes(EncryptionKey);
 
            // Hash the password with SHA256
            passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
 
            byte[] bytesEncrypted = EncryptionHelper1.AES_Encrypt(bytesToBeEncrypted, passwordBytes);
 
            string result = Convert.ToBase64String(bytesEncrypted);
 
            return result;
            string urlenctext = Server.UrlEncode(result);
          
            return urlenctext;
        }

public string DecryptText(string input)
        {
            // Get the bytes of the string
            byte[] bytesToBeDecrypted = Convert.FromBase64String(input);
            byte[] passwordBytes = Encoding.UTF8.GetBytes(EncryptionKey);
            passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
 
            byte[] bytesDecrypted = EncryptionHelper1.AES_Decrypt(bytesToBeDecrypted, passwordBytes);
 
            string result = Encoding.UTF8.GetString(bytesDecrypted);
 
            return result;
        }

class EncryptionHelper1
    {
        // Set your salt here, change it to meet your flavor:
        // The salt bytes must be at least 8 bytes.
        //The salt should be same for both encryption and decryption
        static byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
        public static byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
        {
            byte[] encryptedBytes = null;
 
            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;
 
 
                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);
 
                    AES.Mode = CipherMode.CBC;
 
                    using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                        cs.Close();
                    }
                    encryptedBytes = ms.ToArray();
                }
            }
 
            return encryptedBytes;
        }
        public static byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
        {
            byte[] decryptedBytes = null;
 
            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;
 
                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);
 
                    AES.Mode = CipherMode.CBC;
 
                    using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
                        cs.Close();
                    }
                    decryptedBytes = ms.ToArray();
                }
            }
 
            return decryptedBytes;
        }
    }