/// <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 (); }