private static void getAdditionalInfos(byte[] contents, string subFilter, out string digestAlgOid, out byte[] messageDigest, out bool isEpes)
{
Org.BouncyCastle.Cms.CmsSignedData signedData = new Org.BouncyCastle.Cms.CmsSignedData(
Org.BouncyCastle.Asn1.Cms.ContentInfo.GetInstance((
new Org.BouncyCastle.Asn1.Asn1InputStream(contents)).ReadObject()));
Org.BouncyCastle.Cms.SignerInformationStore sigInfStore = signedData.GetSignerInfos();
System.Collections.IEnumerator signers = sigInfStore.GetSigners().GetEnumerator();
signers.Reset();
signers.MoveNext();
Org.BouncyCastle.Cms.SignerInformation signerInfo = (Org.BouncyCastle.Cms.SignerInformation)signers.Current;
messageDigest = null;
digestAlgOid = signerInfo.DigestAlgOid;
isEpes = false;
if (subFilter.ToLower() == "adbe.pkcs7.sha1")
{
digestAlgOid = "1.3.14.3.2.26";
messageDigest = ((Org.BouncyCastle.Asn1.DerOctetString)Org.BouncyCastle.Asn1.Cms.SignedData.GetInstance(signedData.ContentInfo.Content).EncapContentInfo.Content).GetOctets();
}
else
{
if (signerInfo.SignedAttributes != null)
{
//messageDigest
Org.BouncyCastle.Asn1.Cms.Attribute messageDigestAttr = signerInfo.SignedAttributes[Org.BouncyCastle.Asn1.Pkcs.PkcsObjectIdentifiers.Pkcs9AtMessageDigest];
if (messageDigestAttr != null &&
messageDigestAttr.AttrValues.Count > 0)
{
messageDigest = Org.BouncyCastle.Asn1.DerOctetString.GetInstance(messageDigestAttr.AttrValues[0]).GetOctets();
}
//signature policy
isEpes = (signerInfo.SignedAttributes[Org.BouncyCastle.Asn1.Pkcs.PkcsObjectIdentifiers.IdAAEtsSigPolicyID] != null &&
signerInfo.SignedAttributes[Org.BouncyCastle.Asn1.Pkcs.PkcsObjectIdentifiers.IdAAEtsSigPolicyID].AttrValues.Count > 0);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TimeStampToken"/> class.
/// </summary>
/// <param name="encodedToken">DER encoded time stamp token</param>
public TimeStampToken(byte[] encodedToken)
{
if (null == encodedToken)
{
throw new ArgumentNullException("encodedToken");
}
EncodedToken = encodedToken;
timeStampToken = new Org.BouncyCastle.Tsp.TimeStampToken(new Org.BouncyCastle.Cms.CmsSignedData(encodedToken));
this.MessageImprint = new MsgImprint(this.timeStampToken.TimeStampInfo.GetMessageImprintDigest(), this.timeStampToken.TimeStampInfo.MessageImprintAlgOid);
X509Certificate2 tsaCert = null;
Org.BouncyCastle.Cms.SignerID signerId = this.timeStampToken.SignerID;
Org.BouncyCastle.Cms.CmsSignedData cmsSignedData = new Org.BouncyCastle.Cms.CmsSignedData(this.timeStampToken.GetEncoded());
ICollection signerCerts = cmsSignedData.GetCertificates("COLLECTION").GetMatches(this.timeStampToken.SignerID);
foreach (Org.BouncyCastle.X509.X509Certificate cert in signerCerts)
{
tsaCert = new X509Certificate2(cert.GetEncoded());
}
this.TsaInformation = new TsaId(signerId, tsaCert);
}