using System;
using System.Collections.Generic;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.IO;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.Collections;
using Org.BouncyCastle.Utilities.IO;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Cms
{
/**
* General class for generating a pkcs7-signature message stream.
*
* A simple example of usage.
*
*
* IX509Store certs...
* CmsSignedDataStreamGenerator gen = new CmsSignedDataStreamGenerator();
*
* gen.AddSigner(privateKey, cert, CmsSignedDataStreamGenerator.DIGEST_SHA1);
*
* gen.AddCertificates(certs);
*
* Stream sigOut = gen.Open(bOut);
*
* sigOut.Write(Encoding.UTF8.GetBytes("Hello World!"));
*
* sigOut.Close();
*
*/
public class CmsSignedDataStreamGenerator
: CmsSignedGenerator
{
private readonly List m_signerInfoGens = new List();
private readonly HashSet m_messageDigestOids = new HashSet();
private readonly IDictionary m_messageDigests =
new Dictionary(StringComparer.OrdinalIgnoreCase);
private readonly IDictionary m_messageHashes =
new Dictionary(StringComparer.OrdinalIgnoreCase);
private bool _messageDigestsLocked;
private int _bufferSize;
private class SignerInfoGeneratorImpl
{
private readonly CmsSignedDataStreamGenerator outer;
private readonly SignerIdentifier _signerIdentifier;
internal readonly DerObjectIdentifier m_digestOid;
private readonly DerObjectIdentifier m_encOid;
private readonly CmsAttributeTableGenerator _sAttr;
private readonly CmsAttributeTableGenerator _unsAttr;
private readonly string _encName;
private readonly ISigner _sig;
internal SignerInfoGeneratorImpl(
CmsSignedDataStreamGenerator outer,
AsymmetricKeyParameter key,
SignerIdentifier signerIdentifier,
DerObjectIdentifier digestOid,
DerObjectIdentifier encOid,
CmsAttributeTableGenerator sAttr,
CmsAttributeTableGenerator unsAttr)
{
this.outer = outer;
_signerIdentifier = signerIdentifier;
m_digestOid = digestOid;
m_encOid = encOid;
_sAttr = sAttr;
_unsAttr = unsAttr;
_encName = CmsSignedHelper.GetEncryptionAlgName(m_encOid);
string digestName = CmsSignedHelper.GetDigestAlgName(digestOid);
string signatureName = digestName + "with" + _encName;
if (_sAttr != null)
{
_sig = SignerUtilities.InitSigner(signatureName, true, key, outer.m_random);
}
else
{
// Note: Need to use raw signatures here since we have already calculated the digest
if (_encName.Equals("RSA"))
{
_sig = SignerUtilities.InitSigner("RSA", true, key, outer.m_random);
}
else if (_encName.Equals("DSA"))
{
_sig = SignerUtilities.InitSigner("NONEwithDSA", true, key, outer.m_random);
}
// TODO Add support for raw PSS
// else if (_encName.equals("RSAandMGF1"))
// {
// _sig = CMSSignedHelper.INSTANCE.getSignatureInstance("NONEWITHRSAPSS", _sigProvider);
// try
// {
// // Init the params this way to avoid having a 'raw' version of each PSS algorithm
// Signature sig2 = CMSSignedHelper.INSTANCE.getSignatureInstance(signatureName, _sigProvider);
// PSSParameterSpec spec = (PSSParameterSpec)sig2.getParameters().getParameterSpec(PSSParameterSpec.class);
// _sig.setParameter(spec);
// }
// catch (Exception e)
// {
// throw new SignatureException("algorithm: " + _encName + " could not be configured.");
// }
// }
else
{
throw new SignatureException("algorithm: " + _encName + " not supported in base signatures.");
}
}
}
internal SignerInfo Generate(DerObjectIdentifier contentType, byte[] calculatedDigest)
{
// TODO AlgorithmIdentifier noParams handling (configure an IDigestAlgorithmFinder)
var digestAlgorithm = new AlgorithmIdentifier(m_digestOid, DerNull.Instance);
try
{
string digestName = CmsSignedHelper.GetDigestAlgName(m_digestOid);
string signatureName = digestName + "with" + _encName;
byte[] bytesToSign = calculatedDigest;
/* RFC 3852 5.4
* The result of the message digest calculation process depends on
* whether the signedAttrs field is present. When the field is absent,
* the result is just the message digest of the content as described
*
* above. When the field is present, however, the result is the message
* digest of the complete DER encoding of the SignedAttrs value
* contained in the signedAttrs field.
*/
Asn1Set signedAttr = null;
if (_sAttr != null)
{
var parameters = outer.GetBaseParameters(contentType, digestAlgorithm, calculatedDigest);
Asn1.Cms.AttributeTable signed = _sAttr.GetAttributes(CollectionUtilities.ReadOnly(parameters));
if (contentType == null) //counter signature
{
if (signed != null && signed[CmsAttributes.ContentType] != null)
{
signed = signed.Remove(CmsAttributes.ContentType);
}
}
signedAttr = outer.GetAttributeSet(signed);
// sig must be composed from the DER encoding.
bytesToSign = signedAttr.GetEncoded(Asn1Encodable.Der);
}
else
{
// Note: Need to use raw signatures here since we have already calculated the digest
if (_encName.Equals("RSA"))
{
DigestInfo dInfo = new DigestInfo(digestAlgorithm, calculatedDigest);
bytesToSign = dInfo.GetEncoded(Asn1Encodable.Der);
}
}
_sig.BlockUpdate(bytesToSign, 0, bytesToSign.Length);
byte[] sigBytes = _sig.GenerateSignature();
Asn1Set unsignedAttr = null;
if (_unsAttr != null)
{
var parameters = outer.GetBaseParameters(contentType, digestAlgorithm, calculatedDigest);
parameters[CmsAttributeTableParameter.Signature] = sigBytes.Clone();
Asn1.Cms.AttributeTable unsigned = _unsAttr.GetAttributes(CollectionUtilities.ReadOnly(parameters));
unsignedAttr = outer.GetAttributeSet(unsigned);
}
// TODO[RSAPSS] Need the ability to specify non-default parameters
Asn1Encodable sigX509Parameters = SignerUtilities.GetDefaultX509Parameters(signatureName);
AlgorithmIdentifier digestEncryptionAlgorithm = CmsSignedHelper.GetEncAlgorithmIdentifier(
m_encOid, sigX509Parameters);
return new SignerInfo(_signerIdentifier, digestAlgorithm,
signedAttr, digestEncryptionAlgorithm, new DerOctetString(sigBytes), unsignedAttr);
}
catch (IOException e)
{
throw new CmsStreamException("encoding error.", e);
}
catch (SignatureException e)
{
throw new CmsStreamException("error creating signature.", e);
}
}
}
public CmsSignedDataStreamGenerator()
{
}
/// Constructor allowing specific source of randomness
/// Instance of SecureRandom to use.
public CmsSignedDataStreamGenerator(SecureRandom random)
: base(random)
{
}
/**
* Set the underlying string size for encapsulated data
*
* @param bufferSize length of octet strings to buffer the data.
*/
public void SetBufferSize(int bufferSize)
{
_bufferSize = bufferSize;
}
public void AddDigests(params string[] digestOids)
{
foreach (string digestOid in digestOids)
{
ConfigureDigest(new DerObjectIdentifier(digestOid));
}
}
public void AddDigests(IEnumerable digestOids)
{
foreach (string digestOid in digestOids)
{
ConfigureDigest(new DerObjectIdentifier(digestOid));
}
}
/**
* add a signer - no attributes other than the default ones will be
* provided here.
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(AsymmetricKeyParameter privateKey, X509Certificate cert, string digestOid)
{
AddSigner(privateKey, cert, digestOid, new DefaultSignedAttributeTableGenerator(), null);
}
/**
* add a signer, specifying the digest encryption algorithm - no attributes other than the default ones will be
* provided here.
* @throws NoSuchProviderException
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(
AsymmetricKeyParameter privateKey,
X509Certificate cert,
string encryptionOid,
string digestOid)
{
AddSigner(privateKey, cert, encryptionOid, digestOid,
new DefaultSignedAttributeTableGenerator(),
(CmsAttributeTableGenerator)null);
}
/**
* add a signer with extra signed/unsigned attributes.
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(
AsymmetricKeyParameter privateKey,
X509Certificate cert,
string digestOid,
Asn1.Cms.AttributeTable signedAttr,
Asn1.Cms.AttributeTable unsignedAttr)
{
AddSigner(privateKey, cert, digestOid,
new DefaultSignedAttributeTableGenerator(signedAttr),
new SimpleAttributeTableGenerator(unsignedAttr));
}
/**
* add a signer with extra signed/unsigned attributes - specifying digest
* encryption algorithm.
* @throws NoSuchProviderException
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(
AsymmetricKeyParameter privateKey,
X509Certificate cert,
string encryptionOid,
string digestOid,
Asn1.Cms.AttributeTable signedAttr,
Asn1.Cms.AttributeTable unsignedAttr)
{
AddSigner(privateKey, cert, encryptionOid, digestOid,
new DefaultSignedAttributeTableGenerator(signedAttr),
new SimpleAttributeTableGenerator(unsignedAttr));
}
public void AddSigner(
AsymmetricKeyParameter privateKey,
X509Certificate cert,
string digestOid,
CmsAttributeTableGenerator signedAttrGenerator,
CmsAttributeTableGenerator unsignedAttrGenerator)
{
AddSigner(privateKey, cert, CmsSignedHelper.GetEncOid(privateKey, digestOid)?.Id, digestOid,
signedAttrGenerator, unsignedAttrGenerator);
}
public void AddSigner(
AsymmetricKeyParameter privateKey,
X509Certificate cert,
string encryptionOid,
string digestOid,
CmsAttributeTableGenerator signedAttrGenerator,
CmsAttributeTableGenerator unsignedAttrGenerator)
{
DoAddSigner(privateKey, GetSignerIdentifier(cert), new DerObjectIdentifier(encryptionOid),
new DerObjectIdentifier(digestOid), signedAttrGenerator, unsignedAttrGenerator);
}
/**
* add a signer - no attributes other than the default ones will be
* provided here.
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(
AsymmetricKeyParameter privateKey,
byte[] subjectKeyID,
string digestOid)
{
AddSigner(privateKey, subjectKeyID, digestOid, new DefaultSignedAttributeTableGenerator(),
(CmsAttributeTableGenerator)null);
}
/**
* add a signer - no attributes other than the default ones will be
* provided here.
* @throws NoSuchProviderException
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(
AsymmetricKeyParameter privateKey,
byte[] subjectKeyID,
string encryptionOid,
string digestOid)
{
AddSigner(privateKey, subjectKeyID, encryptionOid, digestOid,
new DefaultSignedAttributeTableGenerator(),
(CmsAttributeTableGenerator)null);
}
/**
* add a signer with extra signed/unsigned attributes.
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public void AddSigner(
AsymmetricKeyParameter privateKey,
byte[] subjectKeyID,
string digestOid,
Asn1.Cms.AttributeTable signedAttr,
Asn1.Cms.AttributeTable unsignedAttr)
{
AddSigner(privateKey, subjectKeyID, digestOid,
new DefaultSignedAttributeTableGenerator(signedAttr),
new SimpleAttributeTableGenerator(unsignedAttr));
}
public void AddSigner(
AsymmetricKeyParameter privateKey,
byte[] subjectKeyID,
string digestOid,
CmsAttributeTableGenerator signedAttrGenerator,
CmsAttributeTableGenerator unsignedAttrGenerator)
{
AddSigner(privateKey, subjectKeyID, CmsSignedHelper.GetEncOid(privateKey, digestOid)?.Id, digestOid,
signedAttrGenerator, unsignedAttrGenerator);
}
public void AddSigner(
AsymmetricKeyParameter privateKey,
byte[] subjectKeyID,
string encryptionOid,
string digestOid,
CmsAttributeTableGenerator signedAttrGenerator,
CmsAttributeTableGenerator unsignedAttrGenerator)
{
DoAddSigner(privateKey, GetSignerIdentifier(subjectKeyID), new DerObjectIdentifier(encryptionOid),
new DerObjectIdentifier(digestOid), signedAttrGenerator, unsignedAttrGenerator);
}
private void DoAddSigner(
AsymmetricKeyParameter privateKey,
SignerIdentifier signerIdentifier,
DerObjectIdentifier encryptionOid,
DerObjectIdentifier digestOid,
CmsAttributeTableGenerator signedAttrGenerator,
CmsAttributeTableGenerator unsignedAttrGenerator)
{
ConfigureDigest(digestOid);
SignerInfoGeneratorImpl signerInfoGen = new SignerInfoGeneratorImpl(this, privateKey,
signerIdentifier, digestOid, encryptionOid, signedAttrGenerator, unsignedAttrGenerator);
m_signerInfoGens.Add(signerInfoGen);
}
internal override void AddSignerCallback(
SignerInformation si)
{
// FIXME If there were parameters in si.DigestAlgorithmID.Parameters, they are lost
// NB: Would need to call FixAlgID on the DigestAlgorithmID
// For precalculated signers, just need to register the algorithm, not configure a digest
RegisterDigestOid(si.DigestAlgorithmID.Algorithm);
}
/**
* generate a signed object that for a CMS Signed Data object
*/
public Stream Open(
Stream outStream)
{
return Open(outStream, false);
}
/**
* generate a signed object that for a CMS Signed Data
* object - if encapsulate is true a copy
* of the message will be included in the signature with the
* default content type "data".
*/
public Stream Open(
Stream outStream,
bool encapsulate)
{
return Open(outStream, Data, encapsulate);
}
/**
* generate a signed object that for a CMS Signed Data
* object using the given provider - if encapsulate is true a copy
* of the message will be included in the signature with the
* default content type "data". If dataOutputStream is non null the data
* being signed will be written to the stream as it is processed.
* @param out stream the CMS object is to be written to.
* @param encapsulate true if data should be encapsulated.
* @param dataOutputStream output stream to copy the data being signed to.
*/
public Stream Open(
Stream outStream,
bool encapsulate,
Stream dataOutputStream)
{
return Open(outStream, Data, encapsulate, dataOutputStream);
}
/**
* generate a signed object that for a CMS Signed Data
* object - if encapsulate is true a copy
* of the message will be included in the signature. The content type
* is set according to the OID represented by the string signedContentType.
*/
public Stream Open(
Stream outStream,
string signedContentType,
bool encapsulate)
{
return Open(outStream, signedContentType, encapsulate, null);
}
/**
* generate a signed object that for a CMS Signed Data
* object using the given provider - if encapsulate is true a copy
* of the message will be included in the signature. The content type
* is set according to the OID represented by the string signedContentType.
* @param out stream the CMS object is to be written to.
* @param signedContentType OID for data to be signed.
* @param encapsulate true if data should be encapsulated.
* @param dataOutputStream output stream to copy the data being signed to.
*/
public Stream Open(
Stream outStream,
string signedContentType,
bool encapsulate,
Stream dataOutputStream)
{
if (outStream == null)
throw new ArgumentNullException("outStream");
if (!outStream.CanWrite)
throw new ArgumentException("Expected writeable stream", "outStream");
if (dataOutputStream != null && !dataOutputStream.CanWrite)
throw new ArgumentException("Expected writeable stream", "dataOutputStream");
_messageDigestsLocked = true;
//
// ContentInfo
//
BerSequenceGenerator sGen = new BerSequenceGenerator(outStream);
sGen.AddObject(CmsObjectIdentifiers.SignedData);
//
// Signed Data
//
BerSequenceGenerator sigGen = new BerSequenceGenerator(
sGen.GetRawOutputStream(), 0, true);
bool isCounterSignature = (signedContentType == null);
DerObjectIdentifier contentTypeOid = isCounterSignature
? null
: new DerObjectIdentifier(signedContentType);
sigGen.AddObject(CalculateVersion(contentTypeOid));
Asn1EncodableVector digestAlgs = new Asn1EncodableVector(m_messageDigestOids.Count);
foreach (var messageDigestOid in m_messageDigestOids)
{
// TODO AlgorithmIdentifier noParams handling (configure an IDigestAlgorithmFinder)
digestAlgs.Add(new AlgorithmIdentifier(messageDigestOid, DerNull.Instance));
}
DerSet.FromVector(digestAlgs).EncodeTo(sigGen.GetRawOutputStream());
BerSequenceGenerator eiGen = new BerSequenceGenerator(sigGen.GetRawOutputStream());
eiGen.AddObject(contentTypeOid);
BerOctetStringGenerator octGen = null;
Stream encapStream = null;
// If encapsulating, add the data as an octet string in the sequence
if (encapsulate)
{
octGen = new BerOctetStringGenerator(eiGen.GetRawOutputStream(), 0, true);
encapStream = octGen.GetOctetOutputStream(_bufferSize);
}
// Also send the data to 'dataOutputStream' if necessary
Stream teeStream = GetSafeTeeOutputStream(dataOutputStream, encapStream);
// Let all the digests see the data as it is written
Stream digStream = AttachDigestsToOutputStream(m_messageDigests.Values, teeStream);
return new CmsSignedDataOutputStream(this, digStream, signedContentType, sGen, sigGen, eiGen, octGen);
}
private void RegisterDigestOid(DerObjectIdentifier digestOid)
{
if (!_messageDigestsLocked)
{
m_messageDigestOids.Add(digestOid);
}
else if (!m_messageDigestOids.Contains(digestOid))
{
throw new InvalidOperationException("Cannot register new digest OIDs after the data stream is opened");
}
}
private void ConfigureDigest(DerObjectIdentifier digestOid)
{
RegisterDigestOid(digestOid);
string digestName = CmsSignedHelper.GetDigestAlgName(digestOid);
if (!m_messageDigests.ContainsKey(digestName))
{
if (_messageDigestsLocked)
throw new InvalidOperationException("Cannot configure new digests after the data stream is opened");
m_messageDigests[digestName] = CmsSignedHelper.GetDigestInstance(digestName);
}
}
// TODO Make public?
internal void Generate(
Stream outStream,
string eContentType,
bool encapsulate,
Stream dataOutputStream,
CmsProcessable content)
{
using (var signedOut = Open(outStream, eContentType, encapsulate, dataOutputStream))
{
if (content != null)
{
content.Write(signedOut);
}
}
}
// RFC3852, section 5.1:
// IF ((certificates is present) AND
// (any certificates with a type of other are present)) OR
// ((crls is present) AND
// (any crls with a type of other are present))
// THEN version MUST be 5
// ELSE
// IF (certificates is present) AND
// (any version 2 attribute certificates are present)
// THEN version MUST be 4
// ELSE
// IF ((certificates is present) AND
// (any version 1 attribute certificates are present)) OR
// (any SignerInfo structures are version 3) OR
// (encapContentInfo eContentType is other than id-data)
// THEN version MUST be 3
// ELSE version MUST be 1
//
private DerInteger CalculateVersion(
DerObjectIdentifier contentOid)
{
bool otherCert = false;
bool otherCrl = false;
bool attrCertV1Found = false;
bool attrCertV2Found = false;
if (_certs != null)
{
foreach (object obj in _certs)
{
if (obj is Asn1TaggedObject tagged)
{
if (tagged.TagNo == 1)
{
attrCertV1Found = true;
}
else if (tagged.TagNo == 2)
{
attrCertV2Found = true;
}
else if (tagged.TagNo == 3)
{
otherCert = true;
break;
}
}
}
}
if (otherCert)
{
return new DerInteger(5);
}
if (_crls != null)
{
foreach (object obj in _crls)
{
if (obj is Asn1TaggedObject)
{
otherCrl = true;
break;
}
}
}
if (otherCrl)
{
return new DerInteger(5);
}
if (attrCertV2Found)
{
return new DerInteger(4);
}
if (attrCertV1Found || !CmsObjectIdentifiers.Data.Equals(contentOid) || CheckForVersion3(_signers))
{
return new DerInteger(3);
}
return new DerInteger(1);
}
private bool CheckForVersion3(IList signerInfos)
{
foreach (SignerInformation si in signerInfos)
{
SignerInfo s = SignerInfo.GetInstance(si.ToSignerInfo());
if (s.Version.IntValueExact == 3)
return true;
}
return false;
}
private static Stream AttachDigestsToOutputStream(IEnumerable digests, Stream s)
{
Stream result = s;
foreach (IDigest digest in digests)
{
result = GetSafeTeeOutputStream(result, new DigestSink(digest));
}
return result;
}
private static Stream GetSafeOutputStream(Stream s)
{
return s ?? Stream.Null;
}
private static Stream GetSafeTeeOutputStream(Stream s1, Stream s2)
{
if (s1 == null)
return GetSafeOutputStream(s2);
if (s2 == null)
return GetSafeOutputStream(s1);
return new TeeOutputStream(s1, s2);
}
private class CmsSignedDataOutputStream
: BaseOutputStream
{
private readonly CmsSignedDataStreamGenerator outer;
private Stream _out;
private DerObjectIdentifier _contentOID;
private BerSequenceGenerator _sGen;
private BerSequenceGenerator _sigGen;
private BerSequenceGenerator _eiGen;
private BerOctetStringGenerator _octGen;
public CmsSignedDataOutputStream(
CmsSignedDataStreamGenerator outer,
Stream outStream,
string contentOID,
BerSequenceGenerator sGen,
BerSequenceGenerator sigGen,
BerSequenceGenerator eiGen,
BerOctetStringGenerator octGen)
{
this.outer = outer;
_out = outStream;
_contentOID = new DerObjectIdentifier(contentOID);
_sGen = sGen;
_sigGen = sigGen;
_eiGen = eiGen;
_octGen = octGen;
}
public override void Write(byte[] buffer, int offset, int count)
{
_out.Write(buffer, offset, count);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override void Write(ReadOnlySpan buffer)
{
_out.Write(buffer);
}
#endif
public override void WriteByte(byte value)
{
_out.WriteByte(value);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
DoClose();
}
base.Dispose(disposing);
}
private void DoClose()
{
_out.Dispose();
// TODO Parent context(s) should really be be closed explicitly
// Only for encapsulation
_octGen?.Dispose();
_eiGen.Dispose();
outer.m_digests.Clear(); // clear the current preserved digest state
if (outer._certs.Count > 0)
{
Asn1Set certs = outer.UseDerForCerts
? CmsUtilities.CreateDerSetFromList(outer._certs)
: CmsUtilities.CreateBerSetFromList(outer._certs);
WriteToGenerator(_sigGen, new BerTaggedObject(false, 0, certs));
}
if (outer._crls.Count > 0)
{
Asn1Set crls = outer.UseDerForCrls
? CmsUtilities.CreateDerSetFromList(outer._crls)
: CmsUtilities.CreateBerSetFromList(outer._crls);
WriteToGenerator(_sigGen, new BerTaggedObject(false, 1, crls));
}
//
// Calculate the digest hashes
//
foreach (var de in outer.m_messageDigests)
{
outer.m_messageHashes.Add(de.Key, DigestUtilities.DoFinal(de.Value));
}
// TODO If the digest OIDs for precalculated signers weren't mixed in with
// the others, we could fill in outer._digests here, instead of SignerInfoGenerator.Generate
//
// collect all the SignerInfo objects
//
Asn1EncodableVector signerInfos = new Asn1EncodableVector();
//
// add the generated SignerInfo objects
//
foreach (SignerInfoGeneratorImpl signerInfoGen in outer.m_signerInfoGens)
{
var digestOid = signerInfoGen.m_digestOid;
string digestName = CmsSignedHelper.GetDigestAlgName(digestOid);
byte[] calculatedDigest = outer.m_messageHashes[digestName];
outer.m_digests[digestOid] = (byte[])calculatedDigest.Clone();
signerInfos.Add(signerInfoGen.Generate(_contentOID, calculatedDigest));
}
//
// add the precalculated SignerInfo objects.
//
{
foreach (SignerInformation signer in outer._signers)
{
// TODO Verify the content type and calculated digest match the precalculated SignerInfo
// if (!signer.ContentType.Equals(_contentOID))
// {
// // TODO The precalculated content type did not match - error?
// }
//
// byte[] calculatedDigest = (byte[])outer._digests[signer.DigestAlgOid];
// if (calculatedDigest == null)
// {
// // TODO We can't confirm this digest because we didn't calculate it - error?
// }
// else
// {
// if (!Arrays.AreEqual(signer.GetContentDigest(), calculatedDigest))
// {
// // TODO The precalculated digest did not match - error?
// }
// }
signerInfos.Add(signer.ToSignerInfo());
}
}
WriteToGenerator(_sigGen, DerSet.FromVector(signerInfos));
_sigGen.Dispose();
_sGen.Dispose();
}
private static void WriteToGenerator(Asn1Generator ag, Asn1Encodable ae)
{
ae.EncodeTo(ag.GetRawOutputStream());
}
}
}
}