public IDigest GetMessageDigest()
{
return(DigestAlgorithms.GetMessageDigest(this.digestAlgorithm));
}
/// <exception cref="Org.BouncyCastle.Operator.OperatorCreationException"/>
/// <exception cref="Org.BouncyCastle.Tsp.TSPException"/>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.BouncyCastle.Security.Certificates.CertificateEncodingException"/>
public virtual byte[] CreateTimeStampToken(TimeStampRequest request)
{
// just a more or less random oid of timestamp policy
String policy = "1.3.6.1.4.1.45794.1.1";
TimeStampTokenGenerator tsTokGen = new TimeStampTokenGenerator((AsymmetricKeyParameter)tsaPrivateKey, tsaCertificateChain[0], DigestAlgorithms.GetAllowedDigest("SHA1"), policy);
tsTokGen.SetAccuracySeconds(1);
// TODO setting this is somewhat wrong. Acrobat and openssl recognize timestamp tokens generated with this line as corrupted
// openssl error message: 2304:error:2F09506F:time stamp routines:INT_TS_RESP_VERIFY_TOKEN:tsa name mismatch:ts_rsp_verify.c:476:
// tsTokGen.setTSA(new GeneralName(new X500Name(PrincipalUtil.getIssuerX509Principal(tsCertificate).getName())));
tsTokGen.SetCertificates(X509StoreFactory.Create("Certificate/Collection", new X509CollectionStoreParameters(tsaCertificateChain.ToList())));
// should be unique for every timestamp
BigInteger serialNumber = new BigInteger(SystemUtil.GetTimeBasedSeed().ToString());
DateTime genTime = DateTimeUtil.GetCurrentUtcTime();
TimeStampToken tsToken = tsTokGen.Generate(request, serialNumber, genTime);
return(tsToken.GetEncoded());
}
public virtual void PadesEpesProfileTest01()
{
String notExistingSignaturePolicyOid = "2.16.724.631.3.1.124.2.29.9";
DerObjectIdentifier asn1PolicyOid = DerObjectIdentifier.GetInstance(new DerObjectIdentifier(notExistingSignaturePolicyOid
));
AlgorithmIdentifier hashAlg = new AlgorithmIdentifier(new DerObjectIdentifier(DigestAlgorithms.GetAllowedDigest
("SHA1")));
// indicate that the policy hash value is not known; see ETSI TS 101 733 V2.2.1, 5.8.1
byte[] zeroSigPolicyHash = new byte[] { 0 };
DerOctetString hash = new DerOctetString(zeroSigPolicyHash);
SignaturePolicyId signaturePolicyId = new SignaturePolicyId(asn1PolicyOid, new OtherHashAlgAndValue(hashAlg
, hash));
SignaturePolicyIdentifier sigPolicyIdentifier = new SignaturePolicyIdentifier(signaturePolicyId);
SignApproval(certsSrc + "signCertRsa01.p12", destinationFolder + "padesEpesProfileTest01.pdf", sigPolicyIdentifier
);
BasicCheckSignedDoc(destinationFolder + "padesEpesProfileTest01.pdf", "Signature1");
}
// gets keylength and revision and uses revison to choose the initial values for permissions
public void SetupAllKeys(byte[] userPassword, byte[] ownerPassword, int permissions)
{
if (ownerPassword == null || ownerPassword.Length == 0)
{
ownerPassword = DigestAlgorithms.Digest("MD5", CreateDocumentId());
}
md5.Reset();
permissions |= (int)((revision == STANDARD_ENCRYPTION_128 || revision == AES_128 || revision == AES_256) ? (uint)0xfffff0c0 : (uint)0xffffffc0);
permissions &= unchecked ((int)0xfffffffc);
this.permissions = permissions;
if (revision == AES_256)
{
if (userPassword == null)
{
userPassword = new byte[0];
}
documentID = CreateDocumentId();
byte[] uvs = IVGenerator.GetIV(8);
byte[] uks = IVGenerator.GetIV(8);
key = IVGenerator.GetIV(32);
// Algorithm 3.8.1
IDigest md = DigestUtilities.GetDigest("SHA-256");
md.BlockUpdate(userPassword, 0, Math.Min(userPassword.Length, 127));
md.BlockUpdate(uvs, 0, uvs.Length);
userKey = new byte[48];
md.DoFinal(userKey, 0);
System.Array.Copy(uvs, 0, userKey, 32, 8);
System.Array.Copy(uks, 0, userKey, 40, 8);
// Algorithm 3.8.2
md.BlockUpdate(userPassword, 0, Math.Min(userPassword.Length, 127));
md.BlockUpdate(uks, 0, uks.Length);
byte[] tempDigest = new byte[32];
md.DoFinal(tempDigest, 0);
AESCipherCBCnoPad ac = new AESCipherCBCnoPad(true, tempDigest);
ueKey = ac.ProcessBlock(key, 0, key.Length);
// Algorithm 3.9.1
byte[] ovs = IVGenerator.GetIV(8);
byte[] oks = IVGenerator.GetIV(8);
md.BlockUpdate(ownerPassword, 0, Math.Min(ownerPassword.Length, 127));
md.BlockUpdate(ovs, 0, ovs.Length);
md.BlockUpdate(userKey, 0, userKey.Length);
ownerKey = new byte[48];
md.DoFinal(ownerKey, 0);
System.Array.Copy(ovs, 0, ownerKey, 32, 8);
System.Array.Copy(oks, 0, ownerKey, 40, 8);
// Algorithm 3.9.2
md.BlockUpdate(ownerPassword, 0, Math.Min(ownerPassword.Length, 127));
md.BlockUpdate(oks, 0, oks.Length);
md.BlockUpdate(userKey, 0, userKey.Length);
md.DoFinal(tempDigest, 0);
ac = new AESCipherCBCnoPad(true, tempDigest);
oeKey = ac.ProcessBlock(key, 0, key.Length);
// Algorithm 3.10
byte[] permsp = IVGenerator.GetIV(16);
permsp[0] = (byte)permissions;
permsp[1] = (byte)(permissions >> 8);
permsp[2] = (byte)(permissions >> 16);
permsp[3] = (byte)(permissions >> 24);
permsp[4] = (byte)(255);
permsp[5] = (byte)(255);
permsp[6] = (byte)(255);
permsp[7] = (byte)(255);
permsp[8] = encryptMetadata ? (byte)'T' : (byte)'F';
permsp[9] = (byte)'a';
permsp[10] = (byte)'d';
permsp[11] = (byte)'b';
ac = new AESCipherCBCnoPad(true, key);
perms = ac.ProcessBlock(permsp, 0, permsp.Length);
}
else
{
//PDF refrence 3.5.2 Standard Security Handler, Algorithum 3.3-1
//If there is no owner password, use the user password instead.
byte[] userPad = PadPassword(userPassword);
byte[] ownerPad = PadPassword(ownerPassword);
this.ownerKey = ComputeOwnerKey(userPad, ownerPad);
documentID = CreateDocumentId();
SetupByUserPad(this.documentID, userPad, this.ownerKey, permissions);
}
}
