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//
// System.Security.Cryptography.RC2.cs
//
// Authors:
// Andrew Birkett (andy@nobugs.org)
// Sebastien Pouliot (spouliot@motus.com)
//
using System;
namespace System.Security.Cryptography {
public abstract class RC2 : SymmetricAlgorithm {
public static new RC2 Create ()
{
return Create ("System.Security.Cryptography.RC2");
}
public static new RC2 Create (string algName)
{
return (RC2) CryptoConfig.CreateFromName (algName);
}
protected int EffectiveKeySizeValue;
public virtual int EffectiveKeySize {
get {
if (EffectiveKeySizeValue == 0)
return KeySizeValue;
else
return EffectiveKeySizeValue;
}
set {
if (!IsLegalKeySize (LegalKeySizesValue, value))
throw new CryptographicException ("key size not supported by algorithm");
EffectiveKeySizeValue = value;
}
}
// Overridden, which makes me suspect it changes effective keysize too?
public override int KeySize {
get { return KeySizeValue; }
set { KeySizeValue = value; }
}
public RC2 ()
{
KeySizeValue = 128;
BlockSizeValue = 64;
FeedbackSizeValue = 64;
// The RFC allows keys of 1 to 128 bytes, but MS impl only supports
// 40 to 128 bits, sigh.
LegalKeySizesValue = new KeySizes[1];
LegalKeySizesValue[0] = new KeySizes(40, 128, 8);
LegalBlockSizesValue = new KeySizes[1];
LegalBlockSizesValue[0] = new KeySizes(64, 64, 0);
}
}
}
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