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208 lines
6.6 KiB
208 lines
6.6 KiB
//
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// ASN1Convert.cs: Abstract Syntax Notation 1 convertion routines
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//
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// Authors:
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// Sebastien Pouliot <sebastien@ximian.com>
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// Jesper Pedersen <jep@itplus.dk>
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//
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// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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// (C) 2004 IT+ A/S (http://www.itplus.dk)
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// Copyright (C) 2004-2007 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Globalization;
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using System.Security.Cryptography;
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using System.Text;
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namespace Emby.Server.Core.Cryptography
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{
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// References:
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// a. ITU ASN.1 standards (free download)
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// http://www.itu.int/ITU-T/studygroups/com17/languages/
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public static class ASN1Convert {
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// RFC3280, section 4.2.1.5
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// CAs conforming to this profile MUST always encode certificate
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// validity dates through the year 2049 as UTCTime; certificate validity
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// dates in 2050 or later MUST be encoded as GeneralizedTime.
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// Under 1.x this API requires a Local datetime to be provided
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// Under 2.0 it will also accept a Utc datetime
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static public ASN1 FromDateTime (DateTime dt)
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{
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if (dt.Year < 2050) {
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// UTCTIME
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return new ASN1 (0x17, Encoding.ASCII.GetBytes (
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dt.ToUniversalTime ().ToString ("yyMMddHHmmss",
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CultureInfo.InvariantCulture) + "Z"));
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}
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else {
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// GENERALIZEDTIME
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return new ASN1 (0x18, Encoding.ASCII.GetBytes (
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dt.ToUniversalTime ().ToString ("yyyyMMddHHmmss",
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CultureInfo.InvariantCulture) + "Z"));
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}
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}
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static public ASN1 FromInt32 (Int32 value)
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{
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byte[] integer = BitConverterLE.GetBytes (value);
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Array.Reverse (integer);
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int x = 0;
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while ((x < integer.Length) && (integer [x] == 0x00))
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x++;
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ASN1 asn1 = new ASN1 (0x02);
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switch (x) {
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case 0:
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asn1.Value = integer;
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break;
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case 4:
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asn1.Value = new byte [1];
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break;
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default:
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byte[] smallerInt = new byte [4 - x];
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Buffer.BlockCopy (integer, x, smallerInt, 0, smallerInt.Length);
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asn1.Value = smallerInt;
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break;
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}
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return asn1;
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}
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static public ASN1 FromOid (string oid)
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{
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if (oid == null)
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throw new ArgumentNullException ("oid");
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return new ASN1 (CryptoConfig.EncodeOID (oid));
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}
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static public ASN1 FromUnsignedBigInteger (byte[] big)
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{
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if (big == null)
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throw new ArgumentNullException ("big");
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// check for numbers that could be interpreted as negative (first bit)
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if (big [0] >= 0x80) {
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// in thie cas we add a new, empty, byte (position 0) so we're
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// sure this will always be interpreted an unsigned integer.
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// However we can't feed it into RSAParameters or DSAParameters
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int length = big.Length + 1;
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byte[] uinteger = new byte [length];
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Buffer.BlockCopy (big, 0, uinteger, 1, length - 1);
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big = uinteger;
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}
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return new ASN1 (0x02, big);
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}
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static public int ToInt32 (ASN1 asn1)
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{
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if (asn1 == null)
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throw new ArgumentNullException ("asn1");
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if (asn1.Tag != 0x02)
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throw new FormatException ("Only integer can be converted");
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int x = 0;
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for (int i=0; i < asn1.Value.Length; i++)
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x = (x << 8) + asn1.Value [i];
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return x;
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}
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// Convert a binary encoded OID to human readable string representation of
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// an OID (IETF style). Based on DUMPASN1.C from Peter Gutmann.
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static public string ToOid (ASN1 asn1)
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{
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if (asn1 == null)
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throw new ArgumentNullException ("asn1");
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byte[] aOID = asn1.Value;
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StringBuilder sb = new StringBuilder ();
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// Pick apart the OID
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byte x = (byte) (aOID[0] / 40);
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byte y = (byte) (aOID[0] % 40);
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if (x > 2) {
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// Handle special case for large y if x = 2
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y += (byte) ((x - 2) * 40);
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x = 2;
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}
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sb.Append (x.ToString (CultureInfo.InvariantCulture));
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sb.Append (".");
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sb.Append (y.ToString (CultureInfo.InvariantCulture));
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ulong val = 0;
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for (x = 1; x < aOID.Length; x++) {
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val = ((val << 7) | ((byte) (aOID [x] & 0x7F)));
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if ( !((aOID [x] & 0x80) == 0x80)) {
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sb.Append (".");
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sb.Append (val.ToString (CultureInfo.InvariantCulture));
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val = 0;
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}
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}
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return sb.ToString ();
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}
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static public DateTime ToDateTime (ASN1 time)
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{
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if (time == null)
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throw new ArgumentNullException ("time");
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string t = Encoding.ASCII.GetString (time.Value);
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// to support both UTCTime and GeneralizedTime (and not so common format)
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string mask = null;
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int year;
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switch (t.Length) {
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case 11:
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// illegal format, still it's supported for compatibility
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mask = "yyMMddHHmmZ";
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break;
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case 13:
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// RFC3280: 4.1.2.5.1 UTCTime
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year = Convert.ToInt16 (t.Substring (0, 2), CultureInfo.InvariantCulture);
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// Where YY is greater than or equal to 50, the
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// year SHALL be interpreted as 19YY; and
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// Where YY is less than 50, the year SHALL be
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// interpreted as 20YY.
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if (year >= 50)
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t = "19" + t;
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else
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t = "20" + t;
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mask = "yyyyMMddHHmmssZ";
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break;
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case 15:
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mask = "yyyyMMddHHmmssZ"; // GeneralizedTime
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break;
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case 17:
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// another illegal format (990630000000+1000), again supported for compatibility
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year = Convert.ToInt16 (t.Substring (0, 2), CultureInfo.InvariantCulture);
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string century = (year >= 50) ? "19" : "20";
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// ASN.1 (see ITU X.680 section 43.3) deals with offset differently than .NET
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char sign = (t[12] == '+') ? '-' : '+';
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t = String.Format ("{0}{1}{2}{3}{4}:{5}{6}", century, t.Substring (0, 12), sign,
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t[13], t[14], t[15], t[16]);
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mask = "yyyyMMddHHmmsszzz";
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break;
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}
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return DateTime.ParseExact (t, mask, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal);
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}
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}
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}
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