public static object GetCryptoServiceProvider(this EnumCryptographyAlgorithms algorithm)
{
switch (algorithm)
{
// Symmetric Algorithms
case EnumCryptographyAlgorithms.Aes: return(new AesCryptoServiceProvider()); // :AES :SymmetricAlgorithm
case EnumCryptographyAlgorithms.Des: return(new DESCryptoServiceProvider()); // :DES :SymmetricAlgorithm
case EnumCryptographyAlgorithms.TripleDes: return(new TripleDESCryptoServiceProvider()); // :TripleDES :SymmetricAlgorithm
case EnumCryptographyAlgorithms.Rc2: return(new RC2CryptoServiceProvider()); // :RC2 :SymmetricAlgorithm
// Hash Algorithms
case EnumCryptographyAlgorithms.Md5: return(new MD5CryptoServiceProvider()); // MD5 :HashAlgorithm
case EnumCryptographyAlgorithms.Sha1: return(new SHA1CryptoServiceProvider()); // SHA1 :HashAlgorithm
case EnumCryptographyAlgorithms.Sha256: return(new SHA256CryptoServiceProvider()); // SHA256 :HashAlgorith
case EnumCryptographyAlgorithms.Sha384: return(new SHA384CryptoServiceProvider()); // SHA384 :HashAlgorithm
case EnumCryptographyAlgorithms.Sha512: return(new SHA512CryptoServiceProvider()); // SHA512 :HashAlgorithm
default: return(new AesCryptoServiceProvider());
}
}
public static byte[] Encrypt(this byte[] toEncryptArray, string key, EnumCryptographyAlgorithms algorithm)
{
byte[] resultArray = null;
var objAlgorithmProvider = algorithm.GetCryptoServiceProvider();
if (objAlgorithmProvider is SymmetricAlgorithm symmetricAlg)
{
//set the secret key for the symmetric algorithm
symmetricAlg.SetupSymmetric(key);
var cTransform = symmetricAlg.CreateEncryptor();
//transform the specified region of bytes array to resultArray
resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
//Release resources held by symmetric Encryptor
symmetricAlg.Clear();
}
else if (objAlgorithmProvider is HashAlgorithm hashAlg)
{
resultArray = hashAlg.ComputeHash(toEncryptArray);
//Release resources held by hasher
hashAlg.Clear();
}
return(resultArray);
}
public static string Decrypt(this string cipherString, string key, EnumCryptographyAlgorithms algorithm)
{
//get the byte code of the string
var toEncryptArray = Convert.FromBase64String(cipherString);
var decryptedBytes = toEncryptArray.Decrypt(key, algorithm);
//return the Clear decrypted TEXT
return(Encoding.UTF8.GetString(decryptedBytes));
}
public static string Encrypt(this string toEncrypt, string key, EnumCryptographyAlgorithms algorithm)
{
// string --> (utf8) byte[] --> encrypt ---> byte[] ---> (base64) string
var toEncryptArray = Encoding.UTF8.GetBytes(toEncrypt);
var encryptedBytes = toEncryptArray.Encrypt(key, algorithm);
//Return the encrypted data into unreadable string format
return(Convert.ToBase64String(encryptedBytes, 0, encryptedBytes.Length));
}
public static byte[] Decrypt(this byte[] cipherArray, string key, EnumCryptographyAlgorithms algorithm)
{
byte[] resultArray = null;
var objAlgorithmProvider = algorithm.GetCryptoServiceProvider();
if (objAlgorithmProvider is SymmetricAlgorithm symmetricAlg)
{
//set the secret key for the symmetric algorithm
symmetricAlg.SetupSymmetric(key);
var cTransform = symmetricAlg.CreateDecryptor();
resultArray = cTransform.TransformFinalBlock(cipherArray, 0, cipherArray.Length);
//Release resources held by symmetric Encryptor
symmetricAlg.Clear();
}
return(resultArray);
}
