private void ReadSignersInfo()
{
_nodes = new List <SignerInfoNode>();
foreach (var signer in _signedData.GetSignerInfos().GetSigners())
{
SignerInfoNode node = new SignerInfoNode((SignerInformation)signer, this);
_nodes.Add(node);
}
}
private SignerInformation GetSignerInformation(SignerInfoNode signerInfoNode)
{
if (signerInfoNode.CounterSignatures.Count > 0)
{
var nodes = GetCounterSignatures(signerInfoNode);
BcCms.AttributeTable attributes = signerInfoNode.SignerInformation.UnsignedAttributes.Remove(CmsAttributes.CounterSignature);
SignerInformation newSignerInformation = SignerInformation.ReplaceUnsignedAttributes(signerInfoNode.SignerInformation, attributes);
return(SignerInformation.AddCounterSigners(newSignerInformation, new SignerInformationStore(nodes.ToArray())));
}
else
{
return(signerInfoNode.SignerInformation);
}
}
private IList <SignerInformation> GetCounterSignatures(SignerInfoNode node)
{
List <SignerInformation> list = new List <SignerInformation>();
foreach (var counterSignNode in node.CounterSignatures)
{
if (counterSignNode.CounterSignatures.Count > 0)
{
var nodes = GetCounterSignatures(counterSignNode);
BcCms.AttributeTable attributes = counterSignNode.SignerInformation.UnsignedAttributes.Remove(CmsAttributes.CounterSignature);
SignerInformation newSignerInformation = SignerInformation.ReplaceUnsignedAttributes(counterSignNode.SignerInformation, attributes);
list.Add(SignerInformation.AddCounterSigners(newSignerInformation, new SignerInformationStore(nodes.ToArray())));
}
else
{
list.Add(counterSignNode.SignerInformation);
}
}
return(list);
}
private void ReadInformation()
{
if (_signerInformation.SignedAttributes[PkcsObjectIdentifiers.Pkcs9AtSigningTime] != null)
{
_signingDate = DerUtcTime.GetInstance(_signerInformation.SignedAttributes[PkcsObjectIdentifiers.Pkcs9AtSigningTime].AttrValues[0]).ToDateTime().ToLocalTime();
}
if (_signerInformation.SignedAttributes[PkcsObjectIdentifiers.IdAAEtsSignerAttr] != null)
{
var signerAttr = SignerAttribute.GetInstance(_signerInformation.SignedAttributes[PkcsObjectIdentifiers.IdAAEtsSignerAttr].AttrValues[0]);
List <string> claimedRoles = new List <string>();
foreach (BcCms.Attribute claimedAttr in signerAttr.ClaimedAttributes)
{
foreach (var value in claimedAttr.AttrValues)
{
claimedRoles.Add(DerUtf8String.GetInstance(value).GetString());
}
}
_signerRoles = claimedRoles;
}
if (_signerInformation.UnsignedAttributes != null &&
_signerInformation.UnsignedAttributes[PkcsObjectIdentifiers.IdAASignatureTimeStampToken] != null)
{
_timeStamp = new TimeStampToken(new CmsSignedData(_signerInformation.UnsignedAttributes[PkcsObjectIdentifiers.IdAASignatureTimeStampToken].AttrValues[0].GetEncoded()));
}
// Se leen las contrafirmas
var signers = _signerInformation.GetCounterSignatures().GetSigners();
_counterSignatures = new List <SignerInfoNode>();
foreach (var signer in signers)
{
SignerInfoNode node = new SignerInfoNode((SignerInformation)signer, _sigDocument);
_counterSignatures.Add(node);
}
// Se intenta identificar el certificado empleado para la firma, esto quizás se pueda mejorar
byte[] certHash = null;
IssuerSerial issuerSerial = null;
if (_signerInformation.DigestAlgOid == DigestMethod.SHA1.Oid)
{
BcCms.Attribute attr = _signerInformation.SignedAttributes[PkcsObjectIdentifiers.IdAASigningCertificate];
SigningCertificate sc = SigningCertificate.GetInstance(attr.AttrValues[0]);
EssCertID ecid = sc.GetCerts()[0];
issuerSerial = ecid.IssuerSerial;
certHash = ecid.GetCertHash();
}
else
{
BcCms.Attribute attr = _signerInformation.SignedAttributes[PkcsObjectIdentifiers.IdAASigningCertificateV2];
SigningCertificateV2 sc2 = SigningCertificateV2.GetInstance(attr.AttrValues[0]);
EssCertIDv2 ecid = sc2.GetCerts()[0];
issuerSerial = ecid.IssuerSerial;
certHash = ecid.GetCertHash();
}
DigestMethod digestMethod = DigestMethod.GetByOid(_signerInformation.DigestAlgOid);
foreach (X509CertificateStructure cs in _sigDocument.Certificates)
{
if (issuerSerial == null || cs.TbsCertificate.SerialNumber.Equals(issuerSerial.Serial))
{
byte[] currentCertHash = digestMethod.CalculateDigest(cs.GetEncoded());
if (certHash.SequenceEqual(currentCertHash))
{
_certificate = new X509Certificate(cs);
break;
}
}
}
}
