CSharp Encryption Library
string cipheredText = AesHmac.EncryptString(plaintText, passwordText);
string plaintText = AesHmac.DecryptString(cipheredText, passwordText);
or
AesHmac aesHmac = new AesHmac(passwordText);
string cipheredText = aesHmac.Encrypt(plainText);
string plainText = aesHmac.Decrypt(cipheredText);