/// <summary>
/// Verifies the specified signature using original data and signer's Public key.
/// </summary>
public override bool Verify(byte[] data, byte[] signature, IPublicKey signerKey)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (signature == null)
{
throw new ArgumentNullException(nameof(signature));
}
try
{
using (var virgilSigner = new VirgilSigner())
{
var isValid = virgilSigner.Verify(data, signature, signerKey.Get().Value);
return(isValid);
}
}
catch (Exception ex)
{
throw new CryptoException(ex.Message);
}
}
/// <summary>
/// Exports the Public key into material representation.
/// </summary>
public override byte[] ExportPublicKey(IPublicKey publicKey)
{
try
{
return(VirgilKeyPair.PublicKeyToDER(publicKey.Get().Value));
}
catch (Exception ex)
{
throw new CryptoException(ex.Message);
}
}
/// <summary>
/// Verifies the specified signature using original stream and signer's Public key.
/// </summary>
public override bool Verify(Stream inputStream, byte[] signature, IPublicKey publicKey)
{
if (signature == null)
{
throw new ArgumentNullException(nameof(signature));
}
try
{
using (var streamSigner = new VirgilStreamSigner())
{
var source = new VirgilStreamDataSource(inputStream);
var isValid = streamSigner.Verify(source, signature, publicKey.Get().Value);
return(isValid);
}
}
catch (Exception ex)
{
throw new CryptoException(ex.Message);
}
}
/// <summary>
/// Decrypts and verifies the data.
/// </summary>
/// <param name="cipherData">The cipher data.</param>
/// <param name="privateKey">The Private key to decrypt.</param>
/// <param name="publicKey">The Public key to verify.</param>
/// <returns>The decrypted data</returns>
/// <exception cref="Virgil.SDK.Exceptions.SignatureIsNotValidException"></exception>
/// <exception cref="Virgil.SDK.Exceptions.CryptoException"></exception>
public override byte[] DecryptThenVerify(byte[] cipherData, IPrivateKey privateKey, IPublicKey publicKey)
{
try
{
using (var signer = new VirgilSigner())
using (var cipher = new VirgilCipher())
{
var decryptedData = cipher.DecryptWithKey(cipherData, privateKey.Get().ReceiverId, privateKey.Get().Value);
var signature = cipher.CustomParams().GetData(this.CustomParamKeySignature);
var isValid = signer.Verify(decryptedData, signature, publicKey.Get().Value);
if (!isValid)
{
throw new SignatureIsNotValidException();
}
return(decryptedData);
}
}
catch (Exception ex)
{
throw new CryptoException(ex.Message);
}
}
