private BigInteger GetInteger(ASN1Sequence obj, int index)
{
SecurityAssert.SAssert(index >= 0 && index < obj.Elements.Count);
var elem = obj.Elements[index];
var intElem = elem as ASN1Integer;
SecurityAssert.NotNull(intElem);
return intElem.Value;
}
public override byte[] GetBytes()
{
var asn1 = new ASN1Sequence(new[]
{
new ASN1Integer(Modulus),
new ASN1Integer(Exponent),
});
using (var ms = new MemoryStream())
{
new DERWriter(ms).Write(asn1);
return ms.ToArray();
}
}
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)
});
}
public void Write(ASN1Sequence value)
{
WriteIdentifier(ASN1Class.Universal, true, ASN1UniversalTag.Sequence);
WriteLength(value.ByteLength);
WriteChildren(value);
}
public void Write(ASN1Sequence value)
{
WriteIdentifier(ASN1Class.Universal, true, ASN1UniversalTag.Sequence);
WriteLength(value.ByteLength);
WriteChildren(value);
}