void decode(Byte[] rawData)
{
var asn = new Asn1Reader(rawData);
asn.MoveNext();
Version = (Int32)Asn1Utils.DecodeInteger(asn.GetTagRawData());
asn.MoveNextCurrentLevel();
Issuer = new PkcsSubjectIdentifier(asn.GetTagRawData());
asn.MoveNextCurrentLevel();
HashAlgorithm = new AlgorithmIdentifier(asn.GetTagRawData());
asn.MoveNextCurrentLevel();
if (asn.Tag == 0xa0)
{
_authAttributes.Decode(asn.GetTagRawData());
asn.MoveNextCurrentLevel();
}
EncryptedHashAlgorithm = new AlgorithmIdentifier(asn.GetTagRawData());
asn.MoveNextCurrentLevel();
EncryptedHash = asn.GetPayload();
if (asn.MoveNextCurrentLevel() && asn.Tag == 0xa1)
{
_unauthAttributes.Decode(asn.GetTagRawData());
}
_rawData.AddRange(rawData);
}
void signContent(MessageSigner messageSigner, Byte[] content)
{
hashAlgId = new AlgorithmIdentifier(messageSigner.HashingAlgorithm.ToOid(), new Byte[0]);
pubKeyAlgId = new AlgorithmIdentifier(messageSigner.PublicKeyAlgorithm, new Byte[0]);
prepareSigning(content);
SignedContentBlob signedBlob;
if (_authAttributes.Any())
{
// auth attributes are encoded as IMPLICIT (OPTIONAL), but RFC2315 §9.3 requires signature computation for SET
var attrBytes = _authAttributes.Encode();
attrBytes[0] = 0x31;
signedBlob = new SignedContentBlob(attrBytes, ContentBlobType.ToBeSignedBlob);
}
else
{
if (content == null)
{
throw new ArgumentException("'content' parameter cannot be null if no authenticated attributes present.");
}
signedBlob = new SignedContentBlob(content, ContentBlobType.ToBeSignedBlob);
}
signerCert = new PkcsSubjectIdentifier(messageSigner.SignerCertificate, SubjectIdentifier);
signedBlob.Sign(messageSigner);
hashValue = signedBlob.Signature.Value;
}
void initializeFromSignerInfo(PkcsSignerInfo signerInfo)
{
Version = signerInfo.Version;
SubjectIdentifier = signerInfo.Issuer.Type;
signerCert = signerInfo.Issuer;
X509Attribute attribute = signerInfo.AuthenticatedAttributes.FirstOrDefault(x => x.Oid.Value == CONTENT_TYPE);
if (attribute != null)
{
ContentType = new Asn1ObjectIdentifier(attribute.RawData).Value;
}
pubKeyAlgId = signerInfo.EncryptedHashAlgorithm;
hashAlgId = signerInfo.HashAlgorithm;
hashValue = signerInfo.EncryptedHash;
_authAttributes.AddRange(signerInfo.AuthenticatedAttributes);
}
