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using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class DerObjectIdentifier
: Asn1Object
{
public static DerObjectIdentifier FromContents(byte[] contents)
{
return CreatePrimitive(contents, true);
}
private readonly string identifier;
private byte[] contents;
/**
* return an Oid from the passed in object
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerObjectIdentifier GetInstance(object obj)
{
if (obj == null || obj is DerObjectIdentifier)
return (DerObjectIdentifier) obj;
if (obj is Asn1Encodable)
{
Asn1Object asn1Obj = ((Asn1Encodable)obj).ToAsn1Object();
if (asn1Obj is DerObjectIdentifier)
return (DerObjectIdentifier)asn1Obj;
}
if (obj is byte[])
return (DerObjectIdentifier)FromByteArray((byte[])obj);
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj), "obj");
}
/**
* return an object Identifier from a tagged object.
*
* @param obj the tagged object holding the object we want
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the tagged object cannot
* be converted.
*/
public static DerObjectIdentifier GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
Asn1Object o = obj.GetObject();
if (explicitly || o is DerObjectIdentifier)
{
return GetInstance(o);
}
return FromContents(Asn1OctetString.GetInstance(o).GetOctets());
}
public DerObjectIdentifier(
string identifier)
{
if (identifier == null)
throw new ArgumentNullException("identifier");
if (!IsValidIdentifier(identifier))
throw new FormatException("string " + identifier + " not an OID");
this.identifier = identifier;
}
internal DerObjectIdentifier(DerObjectIdentifier oid, string branchID)
{
if (!IsValidBranchID(branchID, 0))
throw new ArgumentException("string " + branchID + " not a valid OID branch", "branchID");
this.identifier = oid.Id + "." + branchID;
}
// TODO Change to ID?
public string Id
{
get { return identifier; }
}
public virtual DerObjectIdentifier Branch(string branchID)
{
return new DerObjectIdentifier(this, branchID);
}
/**
* Return true if this oid is an extension of the passed in branch, stem.
* @param stem the arc or branch that is a possible parent.
* @return true if the branch is on the passed in stem, false otherwise.
*/
public virtual bool On(DerObjectIdentifier stem)
{
string id = Id, stemId = stem.Id;
return id.Length > stemId.Length && id[stemId.Length] == '.' && Platform.StartsWith(id, stemId);
}
internal DerObjectIdentifier(byte[] contents, bool clone)
{
this.identifier = MakeOidStringFromBytes(contents);
this.contents = clone ? Arrays.Clone(contents) : contents;
}
private void WriteField(
Stream outputStream,
long fieldValue)
{
byte[] result = new byte[9];
int pos = 8;
result[pos] = (byte)(fieldValue & 0x7f);
while (fieldValue >= (1L << 7))
{
fieldValue >>= 7;
result[--pos] = (byte)((fieldValue & 0x7f) | 0x80);
}
outputStream.Write(result, pos, 9 - pos);
}
private void WriteField(
Stream outputStream,
BigInteger fieldValue)
{
int byteCount = (fieldValue.BitLength + 6) / 7;
if (byteCount == 0)
{
outputStream.WriteByte(0);
}
else
{
BigInteger tmpValue = fieldValue;
byte[] tmp = new byte[byteCount];
for (int i = byteCount-1; i >= 0; i--)
{
tmp[i] = (byte) ((tmpValue.IntValue & 0x7f) | 0x80);
tmpValue = tmpValue.ShiftRight(7);
}
tmp[byteCount-1] &= 0x7f;
outputStream.Write(tmp, 0, tmp.Length);
}
}
private void DoOutput(MemoryStream bOut)
{
OidTokenizer tok = new OidTokenizer(identifier);
string token = tok.NextToken();
int first = int.Parse(token) * 40;
token = tok.NextToken();
if (token.Length <= 18)
{
WriteField(bOut, first + Int64.Parse(token));
}
else
{
WriteField(bOut, new BigInteger(token).Add(BigInteger.ValueOf(first)));
}
while (tok.HasMoreTokens)
{
token = tok.NextToken();
if (token.Length <= 18)
{
WriteField(bOut, Int64.Parse(token));
}
else
{
WriteField(bOut, new BigInteger(token));
}
}
}
private byte[] GetContents()
{
lock (this)
{
if (contents == null)
{
MemoryStream bOut = new MemoryStream();
DoOutput(bOut);
contents = bOut.ToArray();
}
return contents;
}
}
internal override bool EncodeConstructed()
{
return false;
}
internal override int EncodedLength(bool withID)
{
return Asn1OutputStream.GetLengthOfEncodingDL(withID, GetContents().Length);
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
asn1Out.WriteEncodingDL(withID, Asn1Tags.ObjectIdentifier, GetContents());
}
protected override int Asn1GetHashCode()
{
return identifier.GetHashCode();
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerObjectIdentifier other = asn1Object as DerObjectIdentifier;
if (other == null)
return false;
return this.identifier.Equals(other.identifier);
}
public override string ToString()
{
return identifier;
}
private static bool IsValidBranchID(string branchID, int start)
{
int digitCount = 0;
int pos = branchID.Length;
while (--pos >= start)
{
char ch = branchID[pos];
if (ch == '.')
{
if (0 == digitCount || (digitCount > 1 && branchID[pos + 1] == '0'))
return false;
digitCount = 0;
}
else if ('0' <= ch && ch <= '9')
{
++digitCount;
}
else
{
return false;
}
}
if (0 == digitCount || (digitCount > 1 && branchID[pos + 1] == '0'))
return false;
return true;
}
private static bool IsValidIdentifier(string identifier)
{
if (identifier.Length < 3 || identifier[1] != '.')
return false;
char first = identifier[0];
if (first < '0' || first > '2')
return false;
return IsValidBranchID(identifier, 2);
}
private const long LONG_LIMIT = (long.MaxValue >> 7) - 0x7f;
private static string MakeOidStringFromBytes(
byte[] bytes)
{
StringBuilder objId = new StringBuilder();
long value = 0;
BigInteger bigValue = null;
bool first = true;
for (int i = 0; i != bytes.Length; i++)
{
int b = bytes[i];
if (value <= LONG_LIMIT)
{
value += (b & 0x7f);
if ((b & 0x80) == 0) // end of number reached
{
if (first)
{
if (value < 40)
{
objId.Append('0');
}
else if (value < 80)
{
objId.Append('1');
value -= 40;
}
else
{
objId.Append('2');
value -= 80;
}
first = false;
}
objId.Append('.');
objId.Append(value);
value = 0;
}
else
{
value <<= 7;
}
}
else
{
if (bigValue == null)
{
bigValue = BigInteger.ValueOf(value);
}
bigValue = bigValue.Or(BigInteger.ValueOf(b & 0x7f));
if ((b & 0x80) == 0)
{
if (first)
{
objId.Append('2');
bigValue = bigValue.Subtract(BigInteger.ValueOf(80));
first = false;
}
objId.Append('.');
objId.Append(bigValue);
bigValue = null;
value = 0;
}
else
{
bigValue = bigValue.ShiftLeft(7);
}
}
}
return objId.ToString();
}
private static readonly DerObjectIdentifier[] cache = new DerObjectIdentifier[1024];
internal static DerObjectIdentifier CreatePrimitive(byte[] contents, bool clone)
{
int hashCode = Arrays.GetHashCode(contents);
int first = hashCode & 1023;
lock (cache)
{
DerObjectIdentifier entry = cache[first];
if (entry != null && Arrays.AreEqual(contents, entry.GetContents()))
{
return entry;
}
return cache[first] = new DerObjectIdentifier(contents, clone);
}
}
}
}
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