//
// 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)
+// (C) 2004 Novell (http://www.novell.com)
+// (C) 2004 IT+ A/S (http://www.itplus.dk)
//
using System;
using System.Collections;
+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;
+ protected byte m_nTag;
+ protected byte[] m_aValue;
+ protected 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];
+ }
}
- }
- m_aValue = new byte [nLength];
- Array.Copy (data, (2 + nLenLength), m_aValue, 0, nLength);
+ m_aValue = new byte [nLength];
+ Array.Copy (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[] aValue)
+ {
+ return CompareArray (m_aValue, aValue);
}
- return asn1;
- }
- public virtual byte[] GetBytes ()
- {
- byte[] val = null;
- if (m_aValue != null) {
- val = m_aValue;
+ public virtual 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];
+ Array.Copy (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 < 256) {
+ der = new byte [3 + nLength];
+ Array.Copy (val, 0, der, 3, nLength);
+ nLengthLen += 0x81;
+ der[2] = (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);
+ }
}
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);
+ 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 + 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 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++];
+ }
+
+ aValue = new byte [anLength];
+ Array.Copy (asn1, anPos, aValue, 0, anLength);
}
- aValue = new byte [anLength];
- Array.Copy (asn1, anPos, aValue, 0, anLength);
- }
+ public ASN1 this [int index] {
+ get {
+ try {
+ if (index >= elist.Count)
+ return null;
+ return (ASN1) elist [index];
+ }
+ catch {
+ return null;
+ }
+ }
+ }
- public ASN1 this [int index] {
- get {
+ public ASN1 Element (int index, byte anTag)
+ {
try {
if (index >= elist.Count)
return null;
- return (ASN1) elist [index];
+
+ ASN1 elm = (ASN1) elist [index];
+ if (elm.Tag == anTag)
+ return elm;
+ else
+ return null;
}
catch {
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;
- }
- catch {
- return null;
+ public override string ToString()
+ {
+ string lineSeperator = Environment.NewLine;
+
+ StringBuilder hexLine = new StringBuilder ();
+
+ // Add tag
+ hexLine.Append ("Tag: ");
+ hexLine.Append (System.Convert.ToString (Tag, 16));
+ hexLine.Append (lineSeperator);
+
+ // Add value
+ hexLine.Append ("Value: ");
+ hexLine.Append (lineSeperator);
+ for (int i = 0; i < Value.Length; i++) {
+ if (Value[i] < 16) {
+ hexLine.Append ("0");
+ }
+ hexLine.Append (System.Convert.ToString (Value [i], 16));
+ hexLine.Append (" ");
+ if ((i+1) % 16 == 0) {
+ hexLine.Append (lineSeperator);
+ }
+ }
+ return hexLine.ToString ();
}
}
}
-
-}
projects / mono.git / commitdiff