BaseType_t xPkcs11GenerateRandomNumber()

in components/pkcs11_helpers/source/pkcs11_helpers.c [40:103]
54 lines of code
13 McCabe index (conditional complexity)

BaseType_t xPkcs11GenerateRandomNumber( uint8_t * pusRandomNumBuffer,
                                        size_t xBufferLength )
{
    BaseType_t xStatus = pdPASS;
    CK_RV xResult = CKR_OK;
    CK_FUNCTION_LIST_PTR pxFunctionList = NULL;
    CK_SESSION_HANDLE xSession = CK_INVALID_HANDLE;

    if( ( pusRandomNumBuffer == NULL ) || ( xBufferLength == 0U ) )
    {
        LogError( ( "Cannot generate random number. Invalid parameters passed. "
                    "buffer=%p,bufferLen=%lu", pusRandomNumBuffer, xBufferLength ) );
        xStatus = pdFAIL;
    }

    if( xStatus == pdPASS )
    {
        /* Get list of functions supported by the PKCS #11 port. */
        xResult = C_GetFunctionList( &pxFunctionList );

        if( ( xResult != CKR_OK ) || ( pxFunctionList == NULL ) )
        {
            LogError( ( "Failed to generate random number. "
                        "PKCS #11 API, C_GetFunctionList, failed." ) );
            xStatus = pdFAIL;
        }
    }

    if( xStatus == pdPASS )
    {
        /* Initialize PKCS #11 module and create a new session. */
        xResult = xInitializePkcs11Session( &xSession );

        if( ( xResult != CKR_OK ) || ( xSession == CK_INVALID_HANDLE ) )
        {
            LogError( ( "Failed to generate random number. "
                        "Failed to initialize PKCS #11 session." ) );
            xStatus = pdFAIL;
        }
    }

    if( xStatus == pdPASS )
    {
        if( pxFunctionList->C_GenerateRandom( xSession,
                                              pusRandomNumBuffer,
                                              xBufferLength ) != CKR_OK )
        {
            xStatus = pdFAIL;
            LogError( ( "Failed to generate random number. "
                        "PKCS #11 API, C_GenerateRandom, failed to generate random number." ) );
        }
    }

    if( xStatus == pdPASS )
    {
        if( pxFunctionList->C_CloseSession( xSession ) != CKR_OK )
        {
            xStatus = pdFAIL;
            LogError( ( " Failed to close PKCS #11 session after generating random number." ) );
        }
    }

    return xStatus;
}