private bool VerifyTimeStamp(byte[] obj, bool timeCheck)
{
byte[] numArray1 = new byte[this.sdIndex.TimeHashObjectIdLen];
Buffer.BlockCopy((Array)obj, (int)this.sdIndex.TimestampHashObjectId, (Array)numArray1, 0, numArray1.Length);
HashAlgorithm hashAlgorithm;
if (SignedObjectAsn.CompareByteArrays(numArray1, this.sha1Oid))
{
CryptoConfig.MapNameToOID("SHA1");
hashAlgorithm = HashAlgorithm.Create("SHA1");
}
else if (SignedObjectAsn.CompareByteArrays(numArray1, this.sha256Oid))
{
hashAlgorithm = (HashAlgorithm) new WinSHA256();
}
else
{
if (!SignedObjectAsn.CompareByteArrays(numArray1, this.md5Oid))
{
return(false);
}
CryptoConfig.MapNameToOID("MD5");
hashAlgorithm = HashAlgorithm.Create("MD5");
}
if (this.sdIndex.TimeSignature == 0L)
{
hashAlgorithm.Clear();
return(false);
}
byte[] numArray2 = new byte[this.sdIndex.TimeDigestLen];
Buffer.BlockCopy((Array)obj, (int)this.sdIndex.TimeDigest, (Array)numArray2, 0, numArray2.Length);
if (!SignedObjectAsn.CompareByteArrays(hashAlgorithm.ComputeHash(obj, (int)this.sdIndex.EncryptedDigestData, (int)this.sdIndex.EncryptedDigestLen), numArray2))
{
hashAlgorithm.Clear();
return(false);
}
string hexString = SignedObjectAsn.CreateHexString(obj, this.sdIndex.TimeCertSerial, this.sdIndex.TimeCertSerialLen);
RSACryptoServiceProvider rsaManaged = new RSACryptoServiceProvider();
RSAParameters rsa = new RSAParameters();
X509Certificate2 certInStore = this.FindCertInStore(hexString);
if (certInStore == null)
{
hashAlgorithm.Clear();
return(false);
}
if (!SignedObjectAsn.ConvertX509PublicKey(certInStore, ref rsa))
{
hashAlgorithm.Clear();
return(false);
}
try
{
((RSA)rsaManaged).ImportParameters(rsa);
}
catch (CryptographicException ex)
{
hashAlgorithm.Clear();
return(false);
}
switch (this.VerifyCertChain(this.memCertStore, certInStore.Handle, false))
{
case 0:
case 1:
byte[] numArray3 = new byte[this.sdIndex.TimeSignatureLen];
Buffer.BlockCopy((Array)obj, (int)this.sdIndex.TimeSignature, (Array)numArray3, 0, numArray3.Length);
byte[] buffer = new byte[this.sdIndex.TimeAuthAttributesLen];
Buffer.BlockCopy((Array)obj, (int)this.sdIndex.TimeAuthAttributes, (Array)buffer, 0, buffer.Length);
buffer[0] = (byte)49;
hashAlgorithm.Initialize();
hashAlgorithm.ComputeHash(buffer);
//if (!rsaManaged.VerifyHash(hashAlgorithm.Hash, "MD5SHA1", numArray3))
if (!rsaManaged.VerifyHash(hashAlgorithm.Hash, CryptoConfig.MapNameToOID("MD5SHA1"), numArray3))
{
hashAlgorithm.Clear();
return(false);
}
hashAlgorithm.Clear();
if (timeCheck)
{
byte[] numArray4 = new byte[this.sdIndex.UtcTimeLen - 1L];
Buffer.BlockCopy((Array)obj, (int)this.sdIndex.UtcTime, (Array)numArray4, 0, numArray4.Length);
DateTime dateTime = new DateTime((int)SignedObjectAsn.CharsToInt(BitConverter.ToInt16(numArray4, 0)) + 2000, (int)SignedObjectAsn.CharsToInt(BitConverter.ToInt16(numArray4, 2)), (int)SignedObjectAsn.CharsToInt(BitConverter.ToInt16(numArray4, 4)), (int)SignedObjectAsn.CharsToInt(BitConverter.ToInt16(numArray4, 6)), (int)SignedObjectAsn.CharsToInt(BitConverter.ToInt16(numArray4, 8)), (int)SignedObjectAsn.CharsToInt(BitConverter.ToInt16(numArray4, 10)));
if (this.notAfter.CompareTo(dateTime) < 0 && this.notBefore.CompareTo(dateTime) > 0)
{
return(false);
}
}
return(true);
default:
hashAlgorithm.Clear();
return(false);
}
}
