/// <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.SignatureDescription" /> class from the specified <see cref="T:System.Security.SecurityElement" />.</summary>
/// <param name="el">The <see cref="T:System.Security.SecurityElement" /> from which to get the algorithms for the signature description. </param>
/// <exception cref="T:System.ArgumentNullException">The <paramref name="el" /> parameter is null.</exception>
public SignatureDescription(SecurityElement el)
{
if (el == null)
{
throw new ArgumentNullException("el");
}
SecurityElement securityElement = el.SearchForChildByTag("Deformatter");
this._DeformatterAlgorithm = ((securityElement != null) ? securityElement.Text : null);
securityElement = el.SearchForChildByTag("Digest");
this._DigestAlgorithm = ((securityElement != null) ? securityElement.Text : null);
securityElement = el.SearchForChildByTag("Formatter");
this._FormatterAlgorithm = ((securityElement != null) ? securityElement.Text : null);
securityElement = el.SearchForChildByTag("Key");
this._KeyAlgorithm = ((securityElement != null) ? securityElement.Text : null);
}
private byte[] GetNamedParam(SecurityElement se, string param)
{
SecurityElement sep = se.SearchForChildByTag(param);
if (sep == null)
{
return(null);
}
return(Convert.FromBase64String(sep.Text));
}
/// LAMESPEC: ArgumentNullException is thrown (not CryptographicException)
public SignatureDescription(SecurityElement el)
{
if (el == null)
{
throw new ArgumentNullException("el");
}
// thanksfully documented in VS.NET 2005
SecurityElement child = el.SearchForChildByTag("Deformatter");
_DeformatterAlgorithm = ((child == null) ? null : child.Text);
child = el.SearchForChildByTag("Digest");
_DigestAlgorithm = ((child == null) ? null : child.Text);
child = el.SearchForChildByTag("Formatter");
_FormatterAlgorithm = ((child == null) ? null : child.Text);
child = el.SearchForChildByTag("Key");
_KeyAlgorithm = ((child == null) ? null : child.Text);
}
