public void Write(ASN1Integer value)
{
WriteIdentifier(ASN1Class.Universal, false, ASN1UniversalTag.Integer);
WriteLength(value.ByteLength);
var buffer = value.Value.ToByteArray();
// convert to big endian
Array.Reverse(buffer);
writer.Write(buffer);
}
public void Write(ASN1Integer value)
{
WriteIdentifier(ASN1Class.Universal, false, ASN1UniversalTag.Integer);
WriteLength(value.ByteLength);
var buffer = value.Value.ToByteArray();
// convert to big endian
Array.Reverse(buffer);
_writer.Write(buffer);
}
private ASN1Object GetASN1(X509Certificate cert)
{
var version = new ASN1Integer(cert.Version - 1);
var taggedVersion = new ASN1Tagged(0, new[] { version });
var serialNumber = new ASN1Integer(cert.SerialNumber);
var signatureAlgo = GetAlgorithmIdentifier(cert.SignatureAlgorithm);
var issuer = GetName(cert.Issuer);
var validity = GetValidity(cert.Validity);
var subject = GetName(cert.Subject);
var subjectPublicKeyInfo = new ASN1Sequence(new[]
{
GetAlgorithmIdentifier(cert.SubjectPublicKeyAlgorithm),
new ASN1BitString(cert.SubjectPublicKey.GetBytes())
});
var tbs = new List<ASN1Object>
{
taggedVersion,
serialNumber,
signatureAlgo,
issuer,
validity,
subject,
subjectPublicKeyInfo
};
if (cert.Version >= 2)
{
//TODO issuerUniqueID
//TODO subjectUniqueID
}
if (cert.Version >= 3)
{
var extensions = GetExtensions(cert.Extensions);
var taggedExtensions = new ASN1Tagged(3, new[] { extensions });
tbs.Add(taggedExtensions);
}
return new ASN1Sequence(new List<ASN1Object>
{
new ASN1Sequence(tbs),
signatureAlgo,
new ASN1BitString(cert.Signature)
});
}