private void DoCreateStandardAttributeTable(IDictionary parameters, IDictionary std)
{
// contentType will be absent if we're trying to generate a counter signature.
if (parameters.Contains(CmsAttributeTableParameter.ContentType))
{
if (!std.Contains(CmsAttributes.ContentType))
{
DerObjectIdentifier contentType = (DerObjectIdentifier)
parameters[CmsAttributeTableParameter.ContentType];
Attribute attr = new Attribute(CmsAttributes.ContentType,
new DerSet(contentType));
std[attr.AttrType] = attr;
}
}
if (!std.Contains(CmsAttributes.SigningTime))
{
Attribute attr = new Attribute(CmsAttributes.SigningTime,
new DerSet(new Time(DateTime.UtcNow)));
std[attr.AttrType] = attr;
}
if (!std.Contains(CmsAttributes.MessageDigest))
{
byte[] messageDigest = (byte[])parameters[CmsAttributeTableParameter.Digest];
Attribute attr = new Attribute(CmsAttributes.MessageDigest,
new DerSet(new DerOctetString(messageDigest)));
std[attr.AttrType] = attr;
}
}
private Asn1Object GetSingleValuedSignedAttribute(
DerObjectIdentifier attrOID, string printableName)
{
AttributeTable unsignedAttrTable = this.UnsignedAttributes;
if (unsignedAttrTable != null &&
unsignedAttrTable.GetAll(attrOID).Count > 0)
{
throw new CmsException("The " + printableName
+ " attribute MUST NOT be an unsigned attribute");
}
AttributeTable signedAttrTable = this.SignedAttributes;
if (signedAttrTable == null)
{
return(null);
}
Asn1EncodableVector v = signedAttrTable.GetAll(attrOID);
switch (v.Count)
{
case 0:
return(null);
case 1:
Attribute t = (Attribute)v[0];
Asn1Set attrValues = t.AttrValues;
if (attrValues.Count != 1)
{
throw new CmsException("A " + printableName
+ " attribute MUST have a single attribute value");
}
return(attrValues[0].ToAsn1Object());
default:
throw new CmsException("The SignedAttributes in a signerInfo MUST NOT include multiple instances of the "
+ printableName + " attribute");
}
}
/**
* Create a standard attribute table from the passed in parameters - this will
* normally include contentType and messageDigest. If the constructor
* using an AttributeTable was used, entries in it for contentType and
* messageDigest will override the generated ones.
*
* @param parameters source parameters for table generation.
*
* @return a filled in IDictionary of attributes.
*/
protected virtual IDictionary CreateStandardAttributeTable(
IDictionary parameters)
{
IDictionary std = Platform.CreateHashtable(table);
if (!std.Contains(CmsAttributes.ContentType))
{
DerObjectIdentifier contentType = (DerObjectIdentifier)
parameters[CmsAttributeTableParameter.ContentType];
Attribute attr = new Attribute(CmsAttributes.ContentType,
new DerSet(contentType));
std[attr.AttrType] = attr;
}
if (!std.Contains(CmsAttributes.MessageDigest))
{
byte[] messageDigest = (byte[])parameters[CmsAttributeTableParameter.Digest];
Attribute attr = new Attribute(CmsAttributes.MessageDigest,
new DerSet(new DerOctetString(messageDigest)));
std[attr.AttrType] = attr;
}
return(std);
}