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//
// System.Security.Cryptography.RSA.cs
//
// Authors:
// Dan Lewis (dihlewis@yahoo.co.uk)
// Sebastien Pouliot (sebastien@ximian.com)
//
// (C) 2002
// Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2006,2008 Novell, Inc (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.Globalization;
using System.Runtime.InteropServices;
using System.Text;
using Mono.Xml;
namespace System.Security.Cryptography {
#if NET_2_0
[ComVisible (true)]
#endif
public abstract class RSA : AsymmetricAlgorithm {
public static new RSA Create ()
{
return Create ("System.Security.Cryptography.RSA");
}
public static new RSA Create (string algName)
{
return (RSA) CryptoConfig.CreateFromName (algName);
}
#if NET_2_0
protected RSA ()
#else
public RSA ()
#endif
{
}
public abstract byte[] EncryptValue (byte[] rgb);
public abstract byte[] DecryptValue (byte[] rgb);
public abstract RSAParameters ExportParameters (bool includePrivateParameters);
public abstract void ImportParameters (RSAParameters parameters);
internal void ZeroizePrivateKey (RSAParameters parameters)
{
if (parameters.P != null)
Array.Clear (parameters.P, 0, parameters.P.Length);
if (parameters.Q != null)
Array.Clear (parameters.Q, 0, parameters.Q.Length);
if (parameters.DP != null)
Array.Clear (parameters.DP, 0, parameters.DP.Length);
if (parameters.DQ != null)
Array.Clear (parameters.DQ, 0, parameters.DQ.Length);
if (parameters.InverseQ != null)
Array.Clear (parameters.InverseQ, 0, parameters.InverseQ.Length);
if (parameters.D != null)
Array.Clear (parameters.D, 0, parameters.D.Length);
}
public override void FromXmlString (string xmlString)
{
if (xmlString == null)
throw new ArgumentNullException ("xmlString");
RSAParameters rsaParams = new RSAParameters ();
try {
rsaParams.P = GetNamedParam (xmlString, "P");
rsaParams.Q = GetNamedParam (xmlString, "Q");
rsaParams.D = GetNamedParam (xmlString, "D");
rsaParams.DP = GetNamedParam (xmlString, "DP");
rsaParams.DQ = GetNamedParam (xmlString, "DQ");
rsaParams.InverseQ = GetNamedParam (xmlString, "InverseQ");
rsaParams.Exponent = GetNamedParam (xmlString, "Exponent");
rsaParams.Modulus = GetNamedParam (xmlString, "Modulus");
ImportParameters (rsaParams);
}
catch (Exception e) {
ZeroizePrivateKey (rsaParams);
throw new CryptographicException (
Locale.GetText ("Couldn't decode XML"), e);
}
finally {
ZeroizePrivateKey (rsaParams);
}
}
public override string ToXmlString (bool includePrivateParameters)
{
StringBuilder sb = new StringBuilder ();
RSAParameters rsaParams = ExportParameters (includePrivateParameters);
try {
sb.Append ("<RSAKeyValue>");
sb.Append ("<Modulus>");
sb.Append (Convert.ToBase64String (rsaParams.Modulus));
sb.Append ("</Modulus>");
sb.Append ("<Exponent>");
sb.Append (Convert.ToBase64String (rsaParams.Exponent));
sb.Append ("</Exponent>");
if (includePrivateParameters) {
// we want an ArgumentNullException is only the D is missing, but a
// CryptographicException if other parameters (CRT) are missings
if (rsaParams.D == null) {
string msg = Locale.GetText ("Missing D parameter for the private key.");
throw new ArgumentNullException (msg);
} else if ((rsaParams.P == null) || (rsaParams.Q == null) || (rsaParams.DP == null) ||
(rsaParams.DQ == null) || (rsaParams.InverseQ == null)) {
// note: we can import a private key, using FromXmlString,
// without the CRT parameters but we export it using ToXmlString!
string msg = Locale.GetText ("Missing some CRT parameters for the private key.");
throw new CryptographicException (msg);
}
sb.Append ("<P>");
sb.Append (Convert.ToBase64String (rsaParams.P));
sb.Append ("</P>");
sb.Append ("<Q>");
sb.Append (Convert.ToBase64String (rsaParams.Q));
sb.Append ("</Q>");
sb.Append ("<DP>");
sb.Append (Convert.ToBase64String (rsaParams.DP));
sb.Append ("</DP>");
sb.Append ("<DQ>");
sb.Append (Convert.ToBase64String (rsaParams.DQ));
sb.Append ("</DQ>");
sb.Append ("<InverseQ>");
sb.Append (Convert.ToBase64String (rsaParams.InverseQ));
sb.Append ("</InverseQ>");
sb.Append ("<D>");
sb.Append (Convert.ToBase64String (rsaParams.D));
sb.Append ("</D>");
}
sb.Append ("</RSAKeyValue>");
}
catch {
ZeroizePrivateKey (rsaParams);
throw;
}
return sb.ToString ();
}
}
}
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