jellyfin-server/Emby.Server.Core/Cryptography/X509CertificateBuilder.cs

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//
// X509CertificateBuilder.cs: Handles building of X.509 certificates.
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// (C) 2004 Novell (http://www.novell.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Security.Cryptography;
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namespace Emby.Server.Core.Cryptography
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{
// From RFC3280
/*
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* Certificate ::= SEQUENCE {
* tbsCertificate TBSCertificate,
* signatureAlgorithm AlgorithmIdentifier,
* signature BIT STRING
* }
* TBSCertificate ::= SEQUENCE {
* version [0] Version DEFAULT v1,
* serialNumber CertificateSerialNumber,
* signature AlgorithmIdentifier,
* issuer Name,
* validity Validity,
* subject Name,
* subjectPublicKeyInfo SubjectPublicKeyInfo,
* issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
* -- If present, version MUST be v2 or v3
* subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
* -- If present, version MUST be v2 or v3
* extensions [3] Extensions OPTIONAL
* -- If present, version MUST be v3 --
* }
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
* CertificateSerialNumber ::= INTEGER
* Validity ::= SEQUENCE {
* notBefore Time,
* notAfter Time
* }
* Time ::= CHOICE {
* utcTime UTCTime,
* generalTime GeneralizedTime
* }
*/
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public class X509CertificateBuilder : X509Builder {
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private byte version;
private byte[] sn;
private string issuer;
private DateTime notBefore;
private DateTime notAfter;
private string subject;
private AsymmetricAlgorithm aa;
private byte[] issuerUniqueID;
private byte[] subjectUniqueID;
private X509ExtensionCollection extensions;
public X509CertificateBuilder () : this (3) {}
public X509CertificateBuilder (byte version)
{
if (version > 3)
throw new ArgumentException ("Invalid certificate version");
this.version = version;
extensions = new X509ExtensionCollection ();
}
public byte Version {
get { return version; }
set { version = value; }
}
public byte[] SerialNumber {
get { return sn; }
set { sn = value; }
}
public string IssuerName {
get { return issuer; }
set { issuer = value; }
}
public DateTime NotBefore {
get { return notBefore; }
set { notBefore = value; }
}
public DateTime NotAfter {
get { return notAfter; }
set { notAfter = value; }
}
public string SubjectName {
get { return subject; }
set { subject = value; }
}
public AsymmetricAlgorithm SubjectPublicKey {
get { return aa; }
set { aa = value; }
}
public byte[] IssuerUniqueId {
get { return issuerUniqueID; }
set { issuerUniqueID = value; }
}
public byte[] SubjectUniqueId {
get { return subjectUniqueID; }
set { subjectUniqueID = value; }
}
public X509ExtensionCollection Extensions {
get { return extensions; }
}
/* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*/
private ASN1 SubjectPublicKeyInfo ()
{
ASN1 keyInfo = new ASN1 (0x30);
if (aa is RSA) {
keyInfo.Add (PKCS7.AlgorithmIdentifier ("1.2.840.113549.1.1.1"));
RSAParameters p = (aa as RSA).ExportParameters (false);
/* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER } -- e
*/
ASN1 key = new ASN1 (0x30);
key.Add (ASN1Convert.FromUnsignedBigInteger (p.Modulus));
key.Add (ASN1Convert.FromUnsignedBigInteger (p.Exponent));
keyInfo.Add (new ASN1 (UniqueIdentifier (key.GetBytes ())));
}
else if (aa is DSA) {
DSAParameters p = (aa as DSA).ExportParameters (false);
/* Dss-Parms ::= SEQUENCE {
* p INTEGER,
* q INTEGER,
* g INTEGER }
*/
ASN1 param = new ASN1 (0x30);
param.Add (ASN1Convert.FromUnsignedBigInteger (p.P));
param.Add (ASN1Convert.FromUnsignedBigInteger (p.Q));
param.Add (ASN1Convert.FromUnsignedBigInteger (p.G));
keyInfo.Add (PKCS7.AlgorithmIdentifier ("1.2.840.10040.4.1", param));
ASN1 key = keyInfo.Add (new ASN1 (0x03));
// DSAPublicKey ::= INTEGER -- public key, y
key.Add (ASN1Convert.FromUnsignedBigInteger (p.Y));
}
else
throw new NotSupportedException ("Unknown Asymmetric Algorithm " + aa.ToString ());
return keyInfo;
}
private byte[] UniqueIdentifier (byte[] id)
{
// UniqueIdentifier ::= BIT STRING
ASN1 uid = new ASN1 (0x03);
// first byte in a BITSTRING is the number of unused bits in the first byte
byte[] v = new byte [id.Length + 1];
Buffer.BlockCopy (id, 0, v, 1, id.Length);
uid.Value = v;
return uid.GetBytes ();
}
protected override ASN1 ToBeSigned (string oid)
{
// TBSCertificate
ASN1 tbsCert = new ASN1 (0x30);
if (version > 1) {
// TBSCertificate / [0] Version DEFAULT v1,
byte[] ver = { (byte)(version - 1) };
ASN1 v = tbsCert.Add (new ASN1 (0xA0));
v.Add (new ASN1 (0x02, ver));
}
// TBSCertificate / CertificateSerialNumber,
tbsCert.Add (new ASN1 (0x02, sn));
// TBSCertificate / AlgorithmIdentifier,
tbsCert.Add (PKCS7.AlgorithmIdentifier (oid));
// TBSCertificate / Name
tbsCert.Add (X501.FromString (issuer));
// TBSCertificate / Validity
ASN1 validity = tbsCert.Add (new ASN1 (0x30));
// TBSCertificate / Validity / Time
validity.Add (ASN1Convert.FromDateTime (notBefore));
// TBSCertificate / Validity / Time
validity.Add (ASN1Convert.FromDateTime (notAfter));
// TBSCertificate / Name
tbsCert.Add (X501.FromString (subject));
// TBSCertificate / SubjectPublicKeyInfo
tbsCert.Add (SubjectPublicKeyInfo ());
if (version > 1) {
// TBSCertificate / [1] IMPLICIT UniqueIdentifier OPTIONAL
if (issuerUniqueID != null)
tbsCert.Add (new ASN1 (0xA1, UniqueIdentifier (issuerUniqueID)));
// TBSCertificate / [2] IMPLICIT UniqueIdentifier OPTIONAL
if (subjectUniqueID != null)
tbsCert.Add (new ASN1 (0xA1, UniqueIdentifier (subjectUniqueID)));
// TBSCertificate / [3] Extensions OPTIONAL
if ((version > 2) && (extensions.Count > 0))
tbsCert.Add (new ASN1 (0xA3, extensions.GetBytes ()));
}
return tbsCert;
}
}
}