/// <summary>
/// Initialize a new instance of the <see cref="CmsRecipient"/> class.
/// </summary>
/// <remarks>
/// <para>Creates a new <see cref="CmsRecipient"/> based on the provided certificate.</para>
/// <para>If the X.509 certificate contains an S/MIME capability extension, the initial value of the
/// <see cref="EncryptionAlgorithms"/> property will be set to whatever encryption algorithms are
/// defined by the S/MIME capability extension, otherwise int will be initialized to a list
/// containing only the Triple-Des encryption algorithm which should be safe to assume for all
/// modern S/MIME v3.x client implementations.</para>
/// </remarks>
/// <param name="certificate">The recipient's certificate.</param>
/// <param name="recipientIdentifierType">The recipient identifier type.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="certificate"/> is <c>null</c>.
/// </exception>
public CmsRecipient (X509Certificate2 certificate, SubjectIdentifierType recipientIdentifierType = SubjectIdentifierType.IssuerAndSerialNumber)
{
if (certificate == null)
throw new ArgumentNullException (nameof (certificate));
if (recipientIdentifierType != SubjectIdentifierType.SubjectKeyIdentifier)
RecipientIdentifierType = SubjectIdentifierType.IssuerAndSerialNumber;
else
RecipientIdentifierType = SubjectIdentifierType.SubjectKeyIdentifier;
EncryptionAlgorithms = certificate.GetEncryptionAlgorithms ();
Certificate = certificate.AsBouncyCastleCertificate ();
}