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<task id="GUID-F6625E22-BFB2-5367-A1A8-916252999B78" xml:lang="en"><title>Exporting

a Public Key</title><prolog><metadata><keywords/></metadata></prolog><taskbody>

<context><p>A public key is exported in the Distinguished Encoding Rules (DER)-encoded <xref href="http://tools.ietf.org/html/rfc4792" scope="external">ASN.1</xref> format.</p><p> The

following steps explain the process of exporting a public key: </p></context>

<steps id="GUID-7ADC22F6-A109-5DD7-BD18-C44E7A77D32D">

<step id="GUID-D0DA1155-B5E7-52C2-8EF6-98624F434832"><cmd/>

<info>Create a file system session using an <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs</apiname></xref> object. </info>

</step>

<step id="GUID-A058B724-1B9D-5F03-85CC-DE633422DFC1"><cmd/>

<info>Create an object of type CUnifiedKeyStore using <xref href="GUID-818689D6-EB99-382E-A435-D9C6C5D464DE.dita#GUID-818689D6-EB99-382E-A435-D9C6C5D464DE/GUID-C7A96153-4179-3B3F-878D-1EAA64A98D39"><apiname>CUnifiedKeyStore::NewL()</apiname></xref> or <xref href="GUID-818689D6-EB99-382E-A435-D9C6C5D464DE.dita#GUID-818689D6-EB99-382E-A435-D9C6C5D464DE/GUID-217FBB3B-CEF5-36F2-A612-EDDA0982053C"><apiname>CUnifiedKeyStore::NewLC()</apiname></xref>. </info>

</step>

<step id="GUID-C3070E3E-CC56-5C21-A354-68EAEB214939"><cmd/>

<info>Initialize the member functions and keystore using the asynchronous

function <xref href="GUID-818689D6-EB99-382E-A435-D9C6C5D464DE.dita#GUID-818689D6-EB99-382E-A435-D9C6C5D464DE/GUID-6C5D732C-1FD1-3EF0-AC90-87690F891B8D"><apiname>CUnifiedKeyStore::Initialize()</apiname></xref>. </info>

</step>

<step id="GUID-AEAE3C68-F064-57AE-B2B3-4CE0606966F2"><cmd/>

<info>Use the <xref href="GUID-818689D6-EB99-382E-A435-D9C6C5D464DE.dita#GUID-818689D6-EB99-382E-A435-D9C6C5D464DE/GUID-8B22E1BC-D779-32DC-9C0A-CA37E4C0A81B"><apiname>CUnifiedKeyStore::List()</apiname></xref> function to list

the keys in the keystore. Retrieve the handle of the public key to be exported. </info>

</step>

<step id="GUID-A0B15734-B41A-5BAD-B839-386B9F36075F"><cmd/>

<info>Use the <xref href="GUID-818689D6-EB99-382E-A435-D9C6C5D464DE.dita#GUID-818689D6-EB99-382E-A435-D9C6C5D464DE/GUID-8C87B9FF-5A81-3EAA-BEC7-65F12855BED7"><apiname>CUnifiedKeyStore::ExportPublic()</apiname></xref> function

to export the public key. </info>

</step>

</steps>

<result><p>A public key is exported to the device memory. </p> </result>

<example><title>Example</title> <p>The following code snippet shows how to

set a file system session object, list the keys in the keystore and then export

the selected public key. </p> <codeblock id="GUID-2D9D08EE-742C-5E19-850C-CD39BFF12D8E" xml:space="preserve">

//Create a file system session object

RFs iFs;

CleanupClosePushL(&iFs);

//Initialise the keystore and member functions

CUnifiedKeyStore* keyStore = CUnifiedKeyStore::NewL(iFs);

keyStore->Initialize(iStatus); //iStatus is a TRequestStatus object

//List the keys of the keystore

RPointerArray<CCTKeyInfo> iKeys; // This variable will contain the result after the completion of the export operation

TCTKeyAttributeFilter  filter.iUsage = EPKCS15UsageAll;

keyStore->List(iKeys, filter, iStatus);

...

//Retrieve the handle of the public key to be exported

_LIT(KLabel,”keylabel”);

//Select the key with the label you are looking for

TInt keyIndex;

for (TInt j = 0; j < iKeys.Count(); j++)

    {

    if (iKeys[j]->Label() == KLabel) 

        {

         keyIndex = j;

         break;

        }

    }

...

//Export the key 

HBufC8* iKeyData = NULL;

TCTTokenObjectHandle aHandle = iKeys[keyIndex]->Handle();

keyStore->ExportPublic(aHandle, iKeyData, iStatus);

//Clean up

CleanupStack::PopAndDestroy(); // iFs</codeblock> </example>

</taskbody><related-links>

<link href="GUID-93069514-BC40-5E53-B126-F5C5C43C3D83.dita"><linktext>Exporting

a Private Key</linktext></link>