diff options
Diffstat (limited to 'Emby.Server.Implementations/Cryptography/X509Extension.cs')
| -rw-r--r-- | Emby.Server.Implementations/Cryptography/X509Extension.cs | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/Cryptography/X509Extension.cs b/Emby.Server.Implementations/Cryptography/X509Extension.cs new file mode 100644 index 000000000..36b17deba --- /dev/null +++ b/Emby.Server.Implementations/Cryptography/X509Extension.cs @@ -0,0 +1,208 @@ +// +// X509Extension.cs: Base class for all X.509 extensions. +// +// Author: +// Sebastien Pouliot <sebastien@ximian.com> +// +// (C) 2003 Motus Technologies Inc. (http://www.motus.com) +// Copyright (C) 2004-2005 Novell, Inc (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.Globalization; +using System.Text; + +namespace Emby.Server.Core.Cryptography +{ + /* + * Extension ::= SEQUENCE { + * extnID OBJECT IDENTIFIER, + * critical BOOLEAN DEFAULT FALSE, + * extnValue OCTET STRING + * } + */ + public class X509Extension { + + protected string extnOid; + protected bool extnCritical; + protected ASN1 extnValue; + + protected X509Extension () + { + extnCritical = false; + } + + public X509Extension (ASN1 asn1) + { + if ((asn1.Tag != 0x30) || (asn1.Count < 2)) + throw new ArgumentException (("Invalid X.509 extension.")); + if (asn1[0].Tag != 0x06) + throw new ArgumentException (("Invalid X.509 extension.")); + + extnOid = ASN1Convert.ToOid (asn1[0]); + extnCritical = ((asn1[1].Tag == 0x01) && (asn1[1].Value[0] == 0xFF)); + // last element is an octet string which may need to be decoded + extnValue = asn1 [asn1.Count - 1]; + if ((extnValue.Tag == 0x04) && (extnValue.Length > 0) && (extnValue.Count == 0)) { + try { + ASN1 encapsulated = new ASN1 (extnValue.Value); + extnValue.Value = null; + extnValue.Add (encapsulated); + } + catch { + // data isn't ASN.1 + } + } + Decode (); + } + + public X509Extension (X509Extension extension) + { + if (extension == null) + throw new ArgumentNullException ("extension"); + if ((extension.Value == null) || (extension.Value.Tag != 0x04) || (extension.Value.Count != 1)) + throw new ArgumentException (("Invalid X.509 extension.")); + + extnOid = extension.Oid; + extnCritical = extension.Critical; + extnValue = extension.Value; + Decode (); + } + + // encode the extension *into* an OCTET STRING + protected virtual void Decode () + { + } + + // decode the extension from *inside* an OCTET STRING + protected virtual void Encode () + { + } + + public ASN1 ASN1 { + get { + ASN1 extension = new ASN1 (0x30); + extension.Add (ASN1Convert.FromOid (extnOid)); + if (extnCritical) + extension.Add (new ASN1 (0x01, new byte [1] { 0xFF })); + Encode (); + extension.Add (extnValue); + return extension; + } + } + + public string Oid { + get { return extnOid; } + } + + public bool Critical { + get { return extnCritical; } + set { extnCritical = value; } + } + + // this gets overrided with more meaningful names + public virtual string Name { + get { return extnOid; } + } + + public ASN1 Value { + get { + if (extnValue == null) { + Encode (); + } + return extnValue; + } + } + + public override bool Equals (object obj) + { + if (obj == null) + return false; + + X509Extension ex = (obj as X509Extension); + if (ex == null) + return false; + + if (extnCritical != ex.extnCritical) + return false; + if (extnOid != ex.extnOid) + return false; + if (extnValue.Length != ex.extnValue.Length) + return false; + + for (int i=0; i < extnValue.Length; i++) { + if (extnValue [i] != ex.extnValue [i]) + return false; + } + return true; + } + + public byte[] GetBytes () + { + return ASN1.GetBytes (); + } + + public override int GetHashCode () + { + // OID should be unique in a collection of extensions + return extnOid.GetHashCode (); + } + + private void WriteLine (StringBuilder sb, int n, int pos) + { + byte[] value = extnValue.Value; + int p = pos; + for (int j=0; j < 8; j++) { + if (j < n) { + sb.Append (value [p++].ToString ("X2", CultureInfo.InvariantCulture)); + sb.Append (" "); + } + else + sb.Append (" "); + } + sb.Append (" "); + p = pos; + for (int j=0; j < n; j++) { + byte b = value [p++]; + if (b < 0x20) + sb.Append ("."); + else + sb.Append (Convert.ToChar (b)); + } + sb.Append (Environment.NewLine); + } + + public override string ToString () + { + StringBuilder sb = new StringBuilder (); + int div = (extnValue.Length >> 3); + int rem = (extnValue.Length - (div << 3)); + int x = 0; + for (int i=0; i < div; i++) { + WriteLine (sb, 8, x); + x += 8; + } + WriteLine (sb, rem, x); + return sb.ToString (); + } + } +} |