/// <summary>
/// Verify signed bytes and PKCS#7 signature.
/// </summary>
/// <param name="signedBytes">signed bytes</param>
/// <param name="signatureBytes">signature bytes</param>
/// <param name="data">other data</param>
public void Verify(byte[] signedBytes, byte[] signatureBytes, CryptoSignatureVerificationData data = null)
{
if (signedBytes == null)
{
throw new ArgumentNullException(nameof(signedBytes));
}
if (signatureBytes == null)
{
throw new ArgumentNullException(nameof(signatureBytes));
}
if (_trustAnchors == null && data?.CertificateBytes == null)
{
throw new ArgumentException("No trust anchors given.");
}
CmsSignedData signedData;
try
{
CmsProcessableByteArray cmsProcessableByteArray = new CmsProcessableByteArray(signedBytes);
signedData = new CmsSignedData(cmsProcessableByteArray, signatureBytes);
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Cannot create signature from " + nameof(signatureBytes), e);
}
SignerInformationStore signerInformationStore = signedData.GetSignerInfos();
ICollection signerCollection = signerInformationStore.GetSigners();
if (signerCollection.Count == 0)
{
throw new PkiVerificationFailedException("Signature does not contain any SignerInformation element.");
}
IX509Store x509Store = signedData.GetCertificates("collection");
IEnumerator signerInfoCollectionEnumerator = signerCollection.GetEnumerator();
while (signerInfoCollectionEnumerator.MoveNext())
{
SignerInformation signerInfo = (SignerInformation)signerInfoCollectionEnumerator.Current;
if (signerInfo == null)
{
throw new PkiVerificationErrorException("Signature does not contain any SignerInformation element.");
}
ICollection x509Collection = x509Store.GetMatches(signerInfo.SignerID);
IEnumerator x509CertificateCollectionEnumerator = x509Collection.GetEnumerator();
if (!x509CertificateCollectionEnumerator.MoveNext())
{
throw new PkiVerificationErrorException("Signature does not contain any x509 certificates.");
}
X509Certificate certificate = (X509Certificate)x509CertificateCollectionEnumerator.Current;
if (data != null)
{
try
{
CertificateTimeVerifier.Verify(certificate, data.SignTime);
}
catch (PkiVerificationFailedCertNotValidException ex)
{
throw new PkiVerificationFailedCertNotValidException("PKCS#7 signature certificate is not valid.", ex);
}
}
if (_certificateRdnSelector != null)
{
try
{
// Verify certificate with rdn selector
if (!_certificateRdnSelector.IsMatch(certificate))
{
throw new PkiVerificationFailedException("Certificate did not match with certificate subject rdn selector.");
}
}
catch (PkiVerificationFailedException)
{
throw;
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Error when verifying PKCS#7 signature.", e);
}
}
try
{
if (!signerInfo.Verify(certificate))
{
throw new PkiVerificationFailedException("Signer information does not match with certificate.");
}
}
catch (CmsException e)
{
throw new PkiVerificationFailedException("Failed to verify PKCS#7 signature.", e);
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Error when verifying PKCS#7 signature.", e);
}
ISet trustAnchors;
if (data?.CertificateBytes != null)
{
try
{
trustAnchors = new HashSet
{
new TrustAnchor(DotNetUtilities.FromX509Certificate(new X509Certificate2(data.CertificateBytes)), null)
};
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Cannot create trust anchor certificate from " + nameof(data.CertificateBytes), e);
}
}
else
{
trustAnchors = _trustAnchors;
}
try
{
ValidateCertPath(certificate, x509Store, trustAnchors);
}
catch (PkiVerificationFailedException)
{
throw;
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Error when verifying PKCS#7 signature.", e);
}
}
}
/// <summary>
/// Verify signed bytes and signature.
/// </summary>
/// <param name="signedBytes">signed bytes</param>
/// <param name="signatureBytes">signature bytes</param>
/// <param name="data">must include certificate bytes</param>
public void Verify(byte[] signedBytes, byte[] signatureBytes, CryptoSignatureVerificationData data)
{
if (signedBytes == null)
{
throw new ArgumentNullException(nameof(signedBytes));
}
if (signatureBytes == null)
{
throw new ArgumentNullException(nameof(signatureBytes));
}
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
byte[] certificateBytes = data.CertificateBytes;
if (certificateBytes == null)
{
throw new PkiVerificationErrorException("Certificate in data parameter cannot be null.");
}
X509Certificate certificate;
try
{
certificate = new X509CertificateParser().ReadCertificate(certificateBytes);
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Could not create certificate from given bytes.", e);
}
if (certificate == null)
{
throw new PkiVerificationErrorException("Could not create certificate from given bytes.");
}
CertificateTimeVerifier.Verify(certificate, data.SignTime);
try
{
ISigner signer = SignerUtilities.GetSigner(_algorithm + "withRSA");
signer.Init(false, certificate.GetPublicKey());
signer.BlockUpdate(signedBytes, 0, signedBytes.Length);
if (!signer.VerifySignature(signatureBytes))
{
throw new PkiVerificationFailedException("Failed to verify RSA signature.");
}
}
catch (PkiVerificationFailedException)
{
throw;
}
catch (Exception e)
{
throw new PkiVerificationErrorException("Error when verifying RSA signature.", e);
}
}
