/// <summary>
/// Initializes a new instance of the <see cref="PublicKey" /> class
/// using SubjectPublicKeyInfo from an <see cref="AsymmetricAlgorithm" />.
/// </summary>
/// <param name="key">
/// An asymmetric algorithm to obtain the SubjectPublicKeyInfo from.
/// </param>
/// <exception cref="CryptographicException">
/// The SubjectPublicKeyInfo could not be decoded. The
/// <see cref="AsymmetricAlgorithm.ExportSubjectPublicKeyInfo" /> must return a
/// valid ASN.1-DER encoded X.509 SubjectPublicKeyInfo.
/// </exception>
/// <exception cref="NotImplementedException">
/// <see cref="AsymmetricAlgorithm.ExportSubjectPublicKeyInfo" /> has not been overridden
/// in a derived class.
/// </exception>
public PublicKey(AsymmetricAlgorithm key)
{
byte[] subjectPublicKey = key.ExportSubjectPublicKeyInfo();
DecodeSubjectPublicKeyInfo(
subjectPublicKey,
out Oid localOid,
out AsnEncodedData localParameters,
out AsnEncodedData localKeyValue);
_oid = localOid;
EncodedParameters = localParameters;
EncodedKeyValue = localKeyValue;
// Do not assign _key = key. Otherwise, the public Key property
// will start returning non Rsa / Dsa types.
}
