--- a/crypto/weakcrypto/source/asymmetric/dsasigner.cpp Tue Aug 31 17:00:08 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,92 +0,0 @@
-/*
-* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
-* All rights reserved.
-* This component and the accompanying materials are made available
-* under the terms of the License "Eclipse Public License v1.0"
-* which accompanies this distribution, and is available
-* at the URL "http://www.eclipse.org/legal/epl-v10.html".
-*
-* Initial Contributors:
-* Nokia Corporation - initial contribution.
-*
-* Contributors:
-*
-* Description:
-*
-*/
-
-
-#include <asymmetric.h>
-
-EXPORT_C CDSASigner* CDSASigner::NewL(const CDSAPrivateKey& aKey)
- {
- CDSASigner* self = new(ELeave) CDSASigner(aKey);
- return self;
- }
-
-EXPORT_C CDSASigner* CDSASigner::NewLC(const CDSAPrivateKey& aKey)
- {
- CDSASigner* self = NewL(aKey);
- CleanupStack::PushL(self);
- return self;
- }
-
-TInt CDSASigner::MaxInputLength(void) const
- {
- return SHA1_HASH; // from hash.h
- }
-
-CDSASignature* CDSASigner::SignL(const TDesC8& aInput) const
- {
- //see HAC 11.56 or DSS section 5
- //I'll follow HAC as I like its description better
- //We don't check that r and s are non both non-null like the DSS
- //states you _optionally_ can. The chances of this are _incredibly_ small.
- //You've got a much better chance of a bit failure ocurring in the hardware
- //than this.
-
- // a) Select a random secret integer (k | 0 < k < q)
- RInteger qminus1 = RInteger::NewL(iPrivateKey.Q());
- CleanupStack::PushL(qminus1);
- --qminus1;
- RInteger k = RInteger::NewRandomL(TInteger::One(), qminus1);
- CleanupStack::PopAndDestroy(&qminus1);
- CleanupStack::PushL(k);
-
- // b) compute r = (g^k mod p) mod q
- RInteger r = TInteger::ModularExponentiateL(iPrivateKey.G(), k,
- iPrivateKey.P());
- CleanupStack::PushL(r);
- r %= iPrivateKey.Q();
-
- // c) compute k^(-1) mod q
- RInteger kinv = k.InverseModL(iPrivateKey.Q());
- CleanupStack::PushL(kinv);
-
- // d) compute s = k^(-1) * {h(m) + xr} mod q
- // Note that in order to be interoperable, compliant with the DSS, and
- // secure, aInput must be the result of a SHA-1 hash
- RInteger hm = RInteger::NewL(aInput);
- CleanupStack::PushL(hm);
-
- RInteger s = iPrivateKey.X().TimesL(r);
- CleanupStack::PushL(s);
- s += hm;
- s *= kinv;
- s %= iPrivateKey.Q();
-
- // e) signature for m is the pair (r,s)
- CDSASignature* signature = CDSASignature::NewL(r, s);//transfers ownership
- CleanupStack::Pop(&s);
- CleanupStack::PopAndDestroy(&hm);
- CleanupStack::PopAndDestroy(&kinv);
- CleanupStack::Pop(&r);
- CleanupStack::PopAndDestroy(&k);
- return signature;
- }
-
-CDSASigner::CDSASigner(const CDSAPrivateKey& aKey)
- : iPrivateKey(aKey)
- {
- }
-