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//
// X509Builder.cs: Abstract builder class for X509 objects
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// (C) 2004 Novell (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.Security.Cryptography;
using Mono.Security;
namespace Mono.Security.X509 {
public abstract class X509Builder {
private const string defaultHash = "SHA1";
private string hashName;
protected X509Builder ()
{
hashName = defaultHash;
}
protected abstract ASN1 ToBeSigned (string hashName);
// move to PKCS1
protected string GetOid (string hashName)
{
switch (hashName.ToLower (CultureInfo.InvariantCulture)) {
case "md2":
// md2withRSAEncryption (1 2 840 113549 1 1 2)
return "1.2.840.113549.1.1.2";
case "md4":
// md4withRSAEncryption (1 2 840 113549 1 1 3)
return "1.2.840.113549.1.1.3";
case "md5":
// md5withRSAEncryption (1 2 840 113549 1 1 4)
return "1.2.840.113549.1.1.4";
case "sha1":
// sha1withRSAEncryption (1 2 840 113549 1 1 5)
return "1.2.840.113549.1.1.5";
case "sha256":
// sha256WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 11 }
return "1.2.840.113549.1.1.11";
case "sha384":
// sha384WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 12 }
return "1.2.840.113549.1.1.12";
case "sha512":
// sha512WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 13 }
return "1.2.840.113549.1.1.13";
default:
throw new NotSupportedException ("Unknown hash algorithm " + hashName);
}
}
public string Hash {
get { return hashName; }
set {
if (hashName == null)
hashName = defaultHash;
else
hashName = value;
}
}
public virtual byte[] Sign (AsymmetricAlgorithm aa)
{
if (aa is RSA)
return Sign (aa as RSA);
else if (aa is DSA)
return Sign (aa as DSA);
else
throw new NotSupportedException ("Unknown Asymmetric Algorithm " + aa.ToString());
}
private byte[] Build (ASN1 tbs, string hashoid, byte[] signature)
{
ASN1 builder = new ASN1 (0x30);
builder.Add (tbs);
builder.Add (PKCS7.AlgorithmIdentifier (hashoid));
// first byte of BITSTRING is the number of unused bits in the first byte
byte[] bitstring = new byte [signature.Length + 1];
Buffer.BlockCopy (signature, 0, bitstring, 1, signature.Length);
builder.Add (new ASN1 (0x03, bitstring));
return builder.GetBytes ();
}
public virtual byte[] Sign (RSA key)
{
string oid = GetOid (hashName);
ASN1 tbs = ToBeSigned (oid);
HashAlgorithm ha = HashAlgorithm.Create (hashName);
byte[] hash = ha.ComputeHash (tbs.GetBytes ());
RSAPKCS1SignatureFormatter pkcs1 = new RSAPKCS1SignatureFormatter (key);
pkcs1.SetHashAlgorithm (hashName);
byte[] signature = pkcs1.CreateSignature (hash);
return Build (tbs, oid, signature);
}
public virtual byte[] Sign (DSA key)
{
string oid = "1.2.840.10040.4.3";
ASN1 tbs = ToBeSigned (oid);
HashAlgorithm ha = HashAlgorithm.Create (hashName);
if (!(ha is SHA1))
throw new NotSupportedException ("Only SHA-1 is supported for DSA");
byte[] hash = ha.ComputeHash (tbs.GetBytes ());
DSASignatureFormatter dsa = new DSASignatureFormatter (key);
dsa.SetHashAlgorithm (hashName);
byte[] rs = dsa.CreateSignature (hash);
// split R and S
byte[] r = new byte [20];
Buffer.BlockCopy (rs, 0, r, 0, 20);
byte[] s = new byte [20];
Buffer.BlockCopy (rs, 20, s, 0, 20);
ASN1 signature = new ASN1 (0x30);
signature.Add (new ASN1 (0x02, r));
signature.Add (new ASN1 (0x02, s));
// dsaWithSha1 (1 2 840 10040 4 3)
return Build (tbs, oid, signature.GetBytes ());
}
}
}
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