//
// ASN1.cs: Abstract Syntax Notation 1 - micro-parser and generator
//
-// Author:
-// Sebastien Pouliot (spouliot@motus.com)
+// Authors:
+// Sebastien Pouliot <sebastien@ximian.com>
+// Jesper Pedersen <jep@itplus.dk>
//
// (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
+// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
+// (C) 2004 IT+ A/S (http://www.itplus.dk)
+//
+// 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.Collections;
+using System.IO;
+using System.Text;
namespace Mono.Security {
-// References:
-// a. ITU ASN.1 standards (free download)
-// http://www.itu.int/ITU-T/studygroups/com17/languages/
+ // References:
+ // a. ITU ASN.1 standards (free download)
+ // http://www.itu.int/ITU-T/studygroups/com17/languages/
#if INSIDE_CORLIB
internal
#else
public
#endif
-class ASN1 {
+ class ASN1 {
- protected byte m_nTag;
- protected byte[] m_aValue;
- protected ArrayList elist;
+ private byte m_nTag;
+ private byte[] m_aValue;
+ private ArrayList elist;
- public ASN1 () : this (0x00, null) {}
+ public ASN1 () : this (0x00, null) {}
- public ASN1 (byte tag) : this (tag, null) {}
+ public ASN1 (byte tag) : this (tag, null) {}
- public ASN1 (byte tag, byte[] data)
- {
- m_nTag = tag;
- m_aValue = data;
- }
+ public ASN1 (byte tag, byte[] data)
+ {
+ m_nTag = tag;
+ m_aValue = data;
+ }
- public ASN1 (byte[] data)
- {
- m_nTag = data [0];
+ public ASN1 (byte[] data)
+ {
+ m_nTag = data [0];
- int nLenLength = 0;
- int nLength = data [1];
+ int nLenLength = 0;
+ int nLength = data [1];
- if (nLength > 0x80) {
- // composed length
- nLenLength = nLength - 0x80;
- nLength = 0;
- for (int i = 0; i < nLenLength; i++) {
- nLength *= 256;
- nLength += data [i + 2];
+ if (nLength > 0x80) {
+ // composed length
+ nLenLength = nLength - 0x80;
+ nLength = 0;
+ for (int i = 0; i < nLenLength; i++) {
+ nLength *= 256;
+ nLength += data [i + 2];
+ }
+ }
+ else if (nLength == 0x80) {
+ // undefined length encoding
+ throw new NotSupportedException ("Undefined length encoding.");
}
- }
- m_aValue = new byte [nLength];
- Array.Copy (data, (2 + nLenLength), m_aValue, 0, nLength);
+ m_aValue = new byte [nLength];
+ Buffer.BlockCopy (data, (2 + nLenLength), m_aValue, 0, nLength);
- if ((m_nTag & 0x20) == 0x20) {
- int nStart = (2 + nLenLength);
- Decode (data, ref nStart, data.Length);
+ if ((m_nTag & 0x20) == 0x20) {
+ int nStart = (2 + nLenLength);
+ Decode (data, ref nStart, data.Length);
+ }
}
- }
- public int Count {
- get {
- if (elist == null)
- return 0;
- return elist.Count;
+ public int Count {
+ get {
+ if (elist == null)
+ return 0;
+ return elist.Count;
+ }
}
- }
-
- public byte Tag {
- get { return m_nTag; }
- }
- public int Length {
- get {
- if (m_aValue != null)
- return m_aValue.Length;
- else
- return 0;
+ public byte Tag {
+ get { return m_nTag; }
}
- }
- public byte[] Value {
- get {
- if (m_aValue == null)
- GetBytes ();
- return (byte[]) m_aValue.Clone ();
- }
- set {
- if (value != null)
- m_aValue = (byte[]) value.Clone ();
+ public int Length {
+ get {
+ if (m_aValue != null)
+ return m_aValue.Length;
+ else
+ return 0;
+ }
}
- }
- private bool CompareArray (byte[] array1, byte[] array2)
- {
- bool bResult = (array1.Length == array2.Length);
- if (bResult) {
- for (int i = 0; i < array1.Length; i++) {
- if (array1[i] != array2[i])
- return false;
+ public byte[] Value {
+ get {
+ if (m_aValue == null)
+ GetBytes ();
+ return (byte[]) m_aValue.Clone ();
+ }
+ set {
+ if (value != null)
+ m_aValue = (byte[]) value.Clone ();
}
}
- return bResult;
- }
- public bool Equals (byte[] asn1)
- {
- return CompareArray (this.GetBytes (), asn1);
- }
+ private bool CompareArray (byte[] array1, byte[] array2)
+ {
+ bool bResult = (array1.Length == array2.Length);
+ if (bResult) {
+ for (int i = 0; i < array1.Length; i++) {
+ if (array1[i] != array2[i])
+ return false;
+ }
+ }
+ return bResult;
+ }
- public bool CompareValue (byte[] aValue)
- {
- return CompareArray (m_aValue, aValue);
- }
+ public bool Equals (byte[] asn1)
+ {
+ return CompareArray (this.GetBytes (), asn1);
+ }
- public virtual ASN1 Add (ASN1 asn1)
- {
- if (asn1 != null) {
- if (elist == null)
- elist = new ArrayList ();
- elist.Add (asn1);
+ public bool CompareValue (byte[] value)
+ {
+ return CompareArray (m_aValue, value);
}
- return asn1;
- }
- public virtual byte[] GetBytes ()
- {
- byte[] val = null;
- if (m_aValue != null) {
- val = m_aValue;
+ public ASN1 Add (ASN1 asn1)
+ {
+ if (asn1 != null) {
+ if (elist == null)
+ elist = new ArrayList ();
+ elist.Add (asn1);
+ }
+ return asn1;
}
- else if (Count > 0) {
- int esize = 0;
- ArrayList al = new ArrayList ();
- foreach (ASN1 a in elist) {
- byte[] item = a.GetBytes ();
- al.Add (item);
- esize += item.Length;
+
+ public virtual byte[] GetBytes ()
+ {
+ byte[] val = null;
+ if (m_aValue != null) {
+ val = m_aValue;
}
- val = new byte [esize];
- int pos = 0;
- for (int i=0; i < elist.Count; i++) {
- byte[] item = (byte[]) al[i];
- Array.Copy (item, 0, val, pos, item.Length);
- pos += item.Length;
+ else if (Count > 0) {
+ int esize = 0;
+ ArrayList al = new ArrayList ();
+ foreach (ASN1 a in elist) {
+ byte[] item = a.GetBytes ();
+ al.Add (item);
+ esize += item.Length;
+ }
+ val = new byte [esize];
+ int pos = 0;
+ for (int i=0; i < elist.Count; i++) {
+ byte[] item = (byte[]) al[i];
+ Buffer.BlockCopy (item, 0, val, pos, item.Length);
+ pos += item.Length;
+ }
}
- }
- byte[] der;
- int nLengthLen = 0;
-
- if (val != null) {
- int nLength = val.Length;
- // special for length > 127
- if (nLength > 127) {
- if (nLength < 256) {
- der = new byte [3 + nLength];
- Array.Copy (val, 0, der, 3, nLength);
- nLengthLen += 0x81;
- der[2] = (byte)(nLength);
+ byte[] der;
+ int nLengthLen = 0;
+
+ if (val != null) {
+ int nLength = val.Length;
+ // special for length > 127
+ if (nLength > 127) {
+ if (nLength <= Byte.MaxValue) {
+ der = new byte [3 + nLength];
+ Buffer.BlockCopy (val, 0, der, 3, nLength);
+ nLengthLen = 0x81;
+ der[2] = (byte)(nLength);
+ }
+ else if (nLength <= UInt16.MaxValue) {
+ der = new byte [4 + nLength];
+ Buffer.BlockCopy (val, 0, der, 4, nLength);
+ nLengthLen = 0x82;
+ der[2] = (byte)(nLength >> 8);
+ der[3] = (byte)(nLength);
+ }
+ else if (nLength <= 0xFFFFFF) {
+ // 24 bits
+ der = new byte [5 + nLength];
+ Buffer.BlockCopy (val, 0, der, 5, nLength);
+ nLengthLen = 0x83;
+ der [2] = (byte)(nLength >> 16);
+ der [3] = (byte)(nLength >> 8);
+ der [4] = (byte)(nLength);
+ }
+ else {
+ // max (Length is an integer) 32 bits
+ der = new byte [6 + nLength];
+ Buffer.BlockCopy (val, 0, der, 6, nLength);
+ nLengthLen = 0x84;
+ der [2] = (byte)(nLength >> 24);
+ der [3] = (byte)(nLength >> 16);
+ der [4] = (byte)(nLength >> 8);
+ der [5] = (byte)(nLength);
+ }
}
else {
- der = new byte [4 + nLength];
- Array.Copy (val, 0, der, 4, nLength);
- nLengthLen += 0x82;
- der[2] = (byte)(nLength / 256);
- der[3] = (byte)(nLength % 256);
+ // basic case (no encoding)
+ der = new byte [2 + nLength];
+ Buffer.BlockCopy (val, 0, der, 2, nLength);
+ nLengthLen = nLength;
}
+ if (m_aValue == null)
+ m_aValue = val;
}
- else {
- der = new byte [2 + nLength];
- Array.Copy (val, 0, der, 2, nLength);
- nLengthLen = nLength;
- }
- if (m_aValue == null)
- m_aValue = val;
- }
- else
- der = new byte[2];
+ else
+ der = new byte[2];
- der[0] = m_nTag;
- der[1] = (byte)nLengthLen;
+ der[0] = m_nTag;
+ der[1] = (byte)nLengthLen;
- return der;
- }
+ return der;
+ }
- // Note: Recursive
- protected void Decode (byte[] asn1, ref int anPos, int anLength)
- {
- byte nTag;
- int nLength;
- byte[] aValue;
+ // Note: Recursive
+ protected void Decode (byte[] asn1, ref int anPos, int anLength)
+ {
+ byte nTag;
+ int nLength;
+ byte[] aValue;
- // minimum is 2 bytes (tag + length of 0)
- while (anPos < anLength - 1) {
- int nPosOri = anPos;
- DecodeTLV (asn1, ref anPos, out nTag, out nLength, out aValue);
+ // minimum is 2 bytes (tag + length of 0)
+ while (anPos < anLength - 1) {
+ int nPosOri = anPos;
+ DecodeTLV (asn1, ref anPos, out nTag, out nLength, out aValue);
- ASN1 elm = Add (new ASN1 (nTag, aValue));
+ ASN1 elm = Add (new ASN1 (nTag, aValue));
- if ((nTag & 0x20) == 0x20) {
- int nConstructedPos = anPos;
- elm.Decode (asn1, ref nConstructedPos, nConstructedPos + nLength);
+ if ((nTag & 0x20) == 0x20) {
+ int nConstructedPos = anPos;
+ elm.Decode (asn1, ref nConstructedPos, nConstructedPos + nLength);
+ }
+ anPos += nLength; // value length
}
- anPos += nLength; // value length
}
- }
- // TLV : Tag - Length - Value
- protected void DecodeTLV (byte[] asn1, ref int anPos, out byte anTag, out int anLength, out byte[] aValue)
- {
- anTag = asn1 [anPos++];
- anLength = asn1 [anPos++];
-
- // special case where L contains the Length of the Length + 0x80
- if ((anLength & 0x80) == 0x80) {
- int nLengthLen = anLength & 0x7F;
- anLength = 0;
- for (int i = 0; i < nLengthLen; i++)
- anLength = anLength * 256 + asn1 [anPos++];
+ // TLV : Tag - Length - Value
+ protected void DecodeTLV (byte[] asn1, ref int pos, out byte tag, out int length, out byte[] content)
+ {
+ tag = asn1 [pos++];
+ length = asn1 [pos++];
+
+ // special case where L contains the Length of the Length + 0x80
+ if ((length & 0x80) == 0x80) {
+ int nLengthLen = length & 0x7F;
+ length = 0;
+ for (int i = 0; i < nLengthLen; i++)
+ length = length * 256 + asn1 [pos++];
+ }
+
+ content = new byte [length];
+ Buffer.BlockCopy (asn1, pos, content, 0, length);
}
- aValue = new byte [anLength];
- Array.Copy (asn1, anPos, aValue, 0, anLength);
- }
+ public ASN1 this [int index] {
+ get {
+ try {
+ if ((elist == null) || (index >= elist.Count))
+ return null;
+ return (ASN1) elist [index];
+ }
+ catch (ArgumentOutOfRangeException) {
+ return null;
+ }
+ }
+ }
- public ASN1 this [int index] {
- get {
+ public ASN1 Element (int index, byte anTag)
+ {
try {
- if (index >= elist.Count)
+ if ((elist == null) || (index >= elist.Count))
+ return null;
+
+ ASN1 elm = (ASN1) elist [index];
+ if (elm.Tag == anTag)
+ return elm;
+ else
return null;
- return (ASN1) elist [index];
}
- catch {
+ catch (ArgumentOutOfRangeException) {
return null;
}
}
- }
- public ASN1 Element (int index, byte anTag)
- {
- try {
- if (index >= elist.Count)
- return null;
-
- ASN1 elm = (ASN1) elist [index];
- if (elm.Tag == anTag)
- return elm;
- else
- return null;
+ public override string ToString()
+ {
+ StringBuilder hexLine = new StringBuilder ();
+
+ // Add tag
+ hexLine.AppendFormat ("Tag: {0} {1}", m_nTag.ToString ("X2"), Environment.NewLine);
+
+ // Add length
+ hexLine.AppendFormat ("Length: {0} {1}", Value.Length, Environment.NewLine);
+
+ // Add value
+ hexLine.Append ("Value: ");
+ hexLine.Append (Environment.NewLine);
+ for (int i = 0; i < Value.Length; i++) {
+ hexLine.AppendFormat ("{0} ", Value [i].ToString ("X2"));
+ if ((i+1) % 16 == 0)
+ hexLine.AppendFormat (Environment.NewLine);
+ }
+ return hexLine.ToString ();
}
- catch {
- return null;
+
+ public void SaveToFile (string filename)
+ {
+ if (filename == null)
+ throw new ArgumentNullException ("filename");
+
+ using (FileStream fs = File.OpenWrite (filename)) {
+ byte[] data = GetBytes ();
+ fs.Write (data, 0, data.Length);
+ fs.Flush ();
+ fs.Close ();
+ }
}
}
}
-
-}
projects / mono.git / blobdiff