Use of IMPLEMENT_ASN1_FUNCTIONS()

[Vinay Kumar L]

Hi All,

I found a code snippet as follows:
ASN1_SEQUENCE(KDC_PRINCNAME) = {
        ASN1_EXP(KDC_PRINCNAME, realm,     ASN1_GENERALSTRING,     0),
        ASN1_EXP(KDC_PRINCNAME, princname, KRB5_PRINCNAME, 1)
} ASN1_SEQUENCE_END(KDC_PRINCNAME);

IMPLEMENT_ASN1_FUNCTIONS(KDC_PRINCNAME)

Here ASN1_SEQUENCE implements the asn1 sequence of KDC_PRINCNAME, but 
what is the functionality of "IMPLEMENT_ASN1_FUNCTIONS(KDC_PRINCNAME)"? 
Is it compulsory  to  include  this  function  after  defining  every  
ASN1_SEQUENCE? Please guide me.

Regards,
Vinay
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