about CryptGenKey

From: angel (qinghui2002_at_sina.com.cn)
Date: 10/29/03

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    Date: Wed, 29 Oct 2003 02:16:01 -0800

    hello:
            while I write CSP, I find that CryptGenKey's
    parameter dwFlags has

    serveral values:
                    CRYPT_EXPORTABLE
                    CRYPT_CREATE_SALT
                    CRYPT_NO_SALT
                    CRYPT_USER_PROTECTED
                    CRYPT_PREGEN
    but In test program testcsp provided by microsoft, I find
    a new parameter value

    that I have never seen: CRYPT_UPDATE_KEY, it is not
    documented in MSDN. I find

    this parameter value is defined SDK header file, why?
        
        can I use these values and how to use them?
                                            
                                            thanks

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