/// <summary>
/// Encrypts the text.
/// </summary>
/// <param name="recipient">The <see cref="VirgilCard"/> recipient.</param>
/// <param name="text">The text.</param>
/// <returns>The encrypted data</returns>
/// <exception cref="ArgumentException"></exception>
public static byte[] EncryptText(this VirgilCard recipient, string text)
{
if (string.IsNullOrWhiteSpace(text))
{
throw new ArgumentException(Localization.ExceptionArgumentIsNullOrWhitespace, nameof(text));
}
return(recipient.Encrypt(Encoding.UTF8.GetBytes(text)));
}
/// <summary>
/// Verifies that a digital signature is valid for specified text.
/// </summary>
/// <param name="recipient">The <see cref="VirgilCard"/> recipient.</param>
/// <param name="text">The text.</param>
/// <param name="signature">The signature.</param>
/// <returns><c>true</c> if the signature is valid; otherwise, <c>false</c>.</returns>
/// <exception cref="ArgumentException"></exception>
public static bool VerifyText(this VirgilCard recipient, string text, byte[] signature)
{
if (string.IsNullOrWhiteSpace(text))
{
throw new ArgumentException(Localization.ExceptionArgumentIsNullOrWhitespace, nameof(text));
}
return(Verify(recipient, Encoding.UTF8.GetBytes(text), signature));
}
/// <summary>
/// Decrypts and verifies the data.
/// </summary>
/// <param name="cipherData">The data to be decrypted.</param>
/// <param name="signer">The signer's <see cref="VirgilCard"/>.</param>
/// <returns>The decrypted data, which is the original plain text before encryption.</returns>
/// <exception cref="ArgumentNullException"></exception>
public byte[] DecryptThenVerify(byte[] cipherData, VirgilCard signer)
{
var crypto = VirgilConfig.GetService <Crypto>();
var publicKey = crypto.ImportPublicKey(signer.PublicKey);
var cipherdata = crypto.DecryptThenVerify(cipherData, this.KeyPair.PrivateKey, publicKey);
return(cipherdata);
}
/// <summary>
/// Verifies that a digital signature is valid for specified text.
/// </summary>
/// <param name="recipient">The <see cref="VirgilCard"/> recipient.</param>
/// <param name="data">The text.</param>
/// <param name="signature">The signature.</param>
/// <returns><c>true</c> if the signature is valid; otherwise, <c>false</c>.</returns>
/// <exception cref="ArgumentException"></exception>
public static bool Verify(this VirgilCard recipient, byte[] data, byte[] signature)
{
if (recipient == null)
{
throw new ArgumentNullException(nameof(recipient));
}
var crypto = VirgilConfig.GetService <Crypto>();
var publicKey = crypto.ImportPublicKey(recipient.PublicKey);
var isValid = crypto.Verify(data, signature, publicKey);
return(isValid);
}
