public byte[] GetCertHash()
{
if (certID == null)
{
return(certIDv2.GetCertHash());
}
return(certID.GetCertHash());
}
public byte[] GetCertHash()
{
return(certID != null
? certID.GetCertHash()
: certIDv2.GetCertHash());
}
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;
}
}
}
}
/**
* Validate the time stamp token.
* <p>
* To be valid the token must be signed by the passed in certificate and
* the certificate must be the one referred to by the SigningCertificate
* attribute included in the the hashed attributes of the token. The
* certificate must also have the ExtendedKeyUsageExtension with only
* KeyPurposeID.IdKPTimeStamping and have been valid at the time the
* timestamp was created.
* </p>
* <p>
* A successful call to validate means all the above are true.
* </p>
*/
public void Validate(
X509Certificate cert)
{
IDigest digest;
try
{
digest = DigestUtilities.GetDigest("SHA-1");
}
catch (SecurityUtilityException e)
{
throw new TspException("cannot find algorithm: " + e.Message, e);
}
try
{
byte[] certEncoded = cert.GetEncoded();
digest.BlockUpdate(certEncoded, 0, certEncoded.Length);
byte[] hash = DigestUtilities.DoFinal(digest);
if (!Arrays.AreEqual(certID.GetCertHash(), hash))
{
throw new TspValidationException("certificate hash does not match certID hash.");
}
if (certID.IssuerSerial != null)
{
if (!certID.IssuerSerial.Serial.Value.Equals(cert.SerialNumber))
{
throw new TspValidationException("certificate serial number does not match certID for signature.");
}
GeneralName[] names = certID.IssuerSerial.Issuer.GetNames();
X509Name principal = PrincipalUtilities.GetIssuerX509Principal(cert);
bool found = false;
for (int i = 0; i != names.Length; i++)
{
if (names[i].TagNo == 4 &&
X509Name.GetInstance(names[i].Name).Equals(principal))
{
found = true;
break;
}
}
if (!found)
{
throw new TspValidationException("certificate name does not match certID for signature. ");
}
}
TspUtil.ValidateCertificate(cert);
cert.CheckValidity(tstInfo.GenTime);
if (!tsaSignerInfo.Verify(cert))
{
throw new TspValidationException("signature not created by certificate.");
}
}
catch (CmsException e)
{
if (e.InnerException != null)
{
throw new TspException(e.Message, e.InnerException);
}
throw new TspException("CMS exception: " + e, e);
}
catch (CertificateEncodingException e)
{
throw new TspException("problem processing certificate: " + e, e);
}
}
