/// <summary>Encrypt a string using a symmetric key algorithm.</summary>
public CipherMessage EncryptStringToBytes(string plainText, int keySize)
{
if (plainText == null || plainText.Length <= 0)
{
throw new ArgumentNullException("plainText");
}
// validate and set the key size
try
{
this._algo.KeySize = keySize;
}
catch (CryptographicException)
{ this._algo.KeySize = this._algo.LegalKeySizes[0].MinSize; }
this._algo.GenerateIV();
this._algo.GenerateKey();
CipherMessage msg = new CipherMessage();
msg.IV = this._algo.IV;
msg.Key = this._algo.Key;
msg.CipherBytes = EncryptStringToBytes(plainText, this._algo.Key, this._algo.IV);
return(msg);
}
/// <summary></summary>
private void DoEncrypt(object sender, EventArgs e)
{
if (String.IsNullOrEmpty(this.pwField.Text))
{
this._msg = null;
return;
}
this._msg = this._encryptor.EncryptStringToBytes(this.pwField.Text.Trim(), this._keySize);
this.FormatFields();
}
/// <summary>Decrypt cipter text using a symmetric key algorithm.</summary>
public string DecryptStringFromBytes(CipherMessage msg)
{
return(this.DecryptStringFromBytes(msg.CipherBytes, msg.Key, msg.IV));
}
