diff -r 51a74ef9ed63 -r ae94777fff8f Symbian3/SDK/Source/GUID-1AA392CB-F638-5D35-993E-4A26D67A7C98.dita
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-1AA392CB-F638-5D35-993E-4A26D67A7C98.dita	Fri Jun 11 12:39:03 2010 +0100
@@ -0,0 +1,147 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 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: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-1AA392CB-F638-5D35-993E-4A26D67A7C98" xml:lang="en"><title>How
+to retrieve characteristics</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The following example demonstrates the use of the legacy selector to retrieve
+the characteristics of an asymmetric cipher object. In the example, an implementation
+object is constructed (making use of an RSA Key Pair also generated by the
+framework) and returned. The plug-in characteristics and extended characteristics
+associated with the object are then accessed. </p>
+<codeblock id="GUID-CF2DF77C-90BD-56A0-A27D-89C4DA18EDCD" xml:space="preserve">#include &lt;cryptoasymmetriccipherapi.h&gt;
+#include &lt;cryptokeypairgeneratorapi.h&gt;
+#include &lt;cryptospidef.h&gt;
+#include &lt;plugincharacteristics.h&gt;
+#include &lt;extendedcharacteristics.h&gt;
+#include &lt;keypair.h&gt;
+
+// Constant definition for the RSA key pair generator exponent value
+const TInt KKeyExponent = 65537;
+
+using namespace CryptoSpi;
+
+// Create a new CCryptoParams instance to contain the RSA Key Pair initialization data
+CCryptoParams* keyParams = CCryptoParams::NewLC(); 
+                    
+// Create an RSA Key Pair and Key Pair Generator object pointers
+CKeyPair* keyPair = NULL;
+CKeyPairGenerator * keypairImpl = NULL;                
+                
+// Set the RSA Key Pair Generator initialization parameters reate an RSA key pair
+keyParams-&gt;AddL(KKeyExponent, KRsaKeyParameterEUid);
+keyParams-&gt;AddL(KRsaPrivateKeyStandard, KRsaKeyTypeUid);
+
+// Retrieve an instance of an RSA Key Pair Generator implementation from the framework
+CKeyPairGeneratorFactory::CreateKeyPairGeneratorL( keypairImpl,
+                                                   KRSAKeyPairGeneratorUid,
+                                                   keyParams);
+                                            
+CleanupStack::PushL(keypairImpl);
+    
+// Create an RSA Key Pair    
+keypairImpl-&gt;GenerateKeyPairL(1024, *keyParams, keyPair);
+                
+CleanupStack::PushL(keyPair);
+                                        
+// Create and initialize a pointer for the asymmetric cipher implementation object        
+CAsymmetricCipher* asymmetricCipherImpl = NULL;
+
+// If successful, the 'CreateAsymmetricCipherL' method returns KErrNone and sets the 
+// asymmetricCipherImpl pointer to point to the constructed implementation
+TRAPD(err, CAsymmetricCipherFactory::CreateAsymmetricCipherL(asymmetricCipherImpl,
+                                                             KRsaCipherUid,
+                                                             keyPair-&gt;PrivateKey(),
+                                                             KCryptoModeEncryptUid,
+                                                             KPaddingModeNoneUid,
+                                                             NULL));
+
+// Having successfully constructed the asymmetric cipher implementation object, 
+// it is possible to retrieve the plug-in characteristics associated with it
+if (asymmetricCipherImpl &amp;&amp; (err == KErrNone))
+ {
+ CleanupStack::PushL(asymmetricCipherImpl);
+
+ // Retrieving common and algorithm-specific characteristics
+ // Create a constant pointer of type TCharacteristics used to access the
+ // asymmetric cipher plug-in's common and algorithm-specific characteristics
+    const TCharacteristics* chars(NULL);
+
+ // Retrieve the common and algorithm-specific characteristics by calling the
+ // 'GetCharacteristicsL' method passing in TCharacteristics pointer
+ asymmetricCipherImpl-&gt;GetCharacteristicsL(chars);
+
+ // Static cast the characteristics to type TAsymmetricCipherCharacteristics
+ const TAsymmetricCipherCharacteristics* asymmetricChars = 
+  static_cast&lt;const TAsymmetricCipherCharacteristics*&gt;(chars);
+
+ // Retrieve the common characteristics from the TASymmetricCipherCharacteristics
+ // object
+ const TCommonCharacteristics* asymmetricCommonChars = &amp;asymmetricChars-&gt;cmn;
+
+    TUid implementationId;
+    TBool hardwareSupported;
+    TRomLitC16 creatorName;
+    TInt maximumKeyLength;
+    TInt32 supportedPaddingModes;
+
+ // Example of extracting asymmetric common characteristics
+ implementationId.iUid = asymmetricCommonChars-&gt;iImplementationUID;
+ hardwareSupported = asymmetricCommonChars-&gt;iIsHardwareSupported;
+ creatorName = *(asymmetricCommonChars-&gt;iCreatorName);
+
+ // Example of extracting asymmetric algorithm specific characteristics
+ maximumKeyLength = asymmetricChars-&gt;iMaximumKeyLength;
+ supportedPaddingModes = *(asymmetricChars-&gt;iSupportedPaddingModes);
+
+ //Retrieving extended characteristics
+
+ // Create a constant pointer of type CExtendedCharacteristics used to store and
+ // access the asymmetric cipher plug-in extended characteristics. Retrieve
+ // the data by calling the 'GetExtendedCharacteristicsL' method and store the
+ // returned pointer
+ const CExtendedCharacteristics* extendedChars =
+  asymmetricCipherImpl-&gt;GetExtendedCharacteristicsL();
+
+ // Const casting the pointer to the CExtendedCharacteristics object allows it to
+ // be pushed onto the cleanup stack
+ CExtendedCharacteristics* ncExtendedChars =
+  const_cast&lt;CExtendedCharacteristics*&gt;(extendedChars);
+ CleanupStack::PushL(ncExtendedChars);
+
+ TInt concurrency;
+
+ // Each of the extended characteristics for the particular cryptographic
+ // implementation can then be accessed by passing the UID value into the
+ // appropriate 'Get' method
+ concurrency = extendedChars-&gt;GetTIntCharacteristicL(KConcurrencyTypeUid);
+ // Alternatively, extended characteristic retrieval can be achieved via the
+ // ListExtendedCharacteristics() method of the CExtendedCharacteristics Object.
+ // Using the 'ListExtendedCharacteristics' function returns a pointer to a
+ // CCryptoParams object, that contains a list of all associated extended
+ // characteristics
+ const CCryptoParams* extendedCryptoParams = 
+  extendedChars-&gt;ListExtendedCharacteristics();
+
+ TBool exclusiveUse;
+
+ // The extended characteristics can then be accessed in much the same way as 
+ // before, making a call to the appropriate 'Get' method with the UID value of the
+ // required type
+ exclusiveUse = extendedCryptoParams-&gt;GetTIntL(KExclusiveUseTypeUid);
+
+ CleanupStack::PopAndDestroy(2, asymmetricCipherImpl);
+ }
+
+// Pop and destroy the remaining items on the cleanup stack
+CleanupStack::PopAndDestroy(3,keyParams);
+    
+</codeblock>
+</conbody></concept>
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