public void ComputeSignature(CmsSigner signer, bool silent)
{
if (signer == null)
{
throw new ArgumentNullException("signer");
}
if (this.ContentInfo.Content.Length == 0)
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Cms_Sign_Empty_Content"));
}
if (SubjectIdentifierType.NoSignature == signer.SignerIdentifierType)
{
if (this.m_safeCryptMsgHandle != null && !this.m_safeCryptMsgHandle.IsInvalid)
{
throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Cms_Sign_No_Signature_First_Signer"));
}
this.Sign(signer, silent);
}
else
{
if (signer.Certificate == null)
{
if (silent)
{
throw new InvalidOperationException(SecurityResources.GetResourceString("Cryptography_Cms_RecipientCertificateNotFound"));
}
signer.Certificate = PkcsUtils.SelectSignerCertificate();
}
if (!signer.Certificate.HasPrivateKey)
{
throw new CryptographicException(-2146893811);
}
CspParameters parameters = new CspParameters();
if (!X509Utils.GetPrivateKeyInfo(X509Utils.GetCertContext(signer.Certificate), ref parameters))
{
throw new CryptographicException(SignedCms.SafeGetLastWin32Error());
}
KeyContainerPermission containerPermission = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
KeyContainerPermissionAccessEntry accessEntry = new KeyContainerPermissionAccessEntry(parameters, KeyContainerPermissionFlags.Open | KeyContainerPermissionFlags.Sign);
containerPermission.AccessEntries.Add(accessEntry);
containerPermission.Demand();
if (this.m_safeCryptMsgHandle == null || this.m_safeCryptMsgHandle.IsInvalid)
{
this.Sign(signer, silent);
}
else
{
this.CoSign(signer, silent);
}
}
}
/// <summary>
/// The <see cref="M:System.Security.Cryptography.Pkcs.SignerInfo.ComputeCounterSignature(System.Security.Cryptography.Pkcs.CmsSigner)"/> method creates a countersignature by using the specified signer and adds the signature to the CMS/PKCS #7 message. Countersignatures are restricted to one level.
/// </summary>
/// <param name="signer">A <see cref="T:System.Security.Cryptography.Pkcs.CmsSigner"/> object that represents the counter signer.</param><exception cref="T:System.ArgumentNullException">A null reference was passed to a method that does not accept it as a valid argument. </exception><exception cref="T:System.Security.Cryptography.CryptographicException">A cryptographic operation could not be completed.</exception>
public void ComputeCounterSignature(CmsSigner signer)
{
if (this.m_parentSignerInfo != null)
{
throw new CryptographicException(-2147483647);
}
if (signer == null)
{
throw new ArgumentNullException("signer");
}
if (signer.Certificate == null)
{
signer.Certificate = PkcsUtils.SelectSignerCertificate();
}
if (!signer.Certificate.HasPrivateKey)
{
throw new CryptographicException(-2146893811);
}
this.CounterSign(signer);
}