API to get BIGNUM member "top" in openssl 3.0

[Paramashivaiah, Sunil]

Hi Billy Brumley,

         I am trying to update the function eay_bn2v() in the racoon2 code. Please check the function in the below link

https://android.googlesource.com/platform/external/ipsec-tools/+/051f86dfca525c160855397f7b6a4fb5ef8df2b5/src/racoon/crypto_openssl.c

       But I found one more source of racoon2 where they are using BN_num_bytes(bn) instead of bn->top * BN_BYTES  
       in eay_bn2v() which I will try to use. Please find the same in the below link
         
https://github.com/zoulasc/racoon2/blob/master/iked/crypto_openssl.c

Thanks and Regards,
Sunil

Message: 1
Date: Fri, 8 Oct 2021 08:42:01 +0300
From: Billy Brumley <bbrumley at gmail.com>
To: "openssl-users at openssl.org" <openssl-users at openssl.org>
Subject: Re: API to get BIGNUM member "top" in openssl 3.0
Message-ID:
	<CAFeDd5YUUVZfDjiZ01VJ_Jd0yP1Pp92QKfKZd6meF-zsQSAm-g at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

>            In our application we are accessing BIGNUM member top as 
> bn->top. Now we are trying
>
>            to migrate to OPENSSL 3.0. I am unable to find API to access this member.
>
>            Please let me know if there is any get API to get the ?top? member of BIGNUM.

Since the structure is opaque, I can't imagine _really_ needing access to ->top since that is a BIGNUM-internal concept.

Can you give a MWE for what you are trying to achieve?

Cheers,

BBB


------------------------------

Message: 2
Date: Fri, 8 Oct 2021 05:56:47 +0000
From: "Dr. Matthias St. Pierre" <Matthias.St.Pierre at ncp-e.com>
To: Billy Brumley <bbrumley at gmail.com>, "openssl-users at openssl.org"
	<openssl-users at openssl.org>
Subject: RE: API to get BIGNUM member "top" in openssl 3.0
Message-ID: <3856680c276a4ddf80a5ab475c75b798 at ncp-e.com>
Content-Type: text/plain; charset="utf-8"

> Can you give a MWE for what you are trying to achieve?

I guess that "minimal working example" is the correct choice from the gazillions of possible meanings of "MWE"?   ?

Regards,
Matthias


[1] https://clicktime.symantec.com/3Ay7qthuCEGV4fNJhsxkkbL6H2?u=https%3A%2F%2Fwww.acronymattic.com%2FMWE.html
[2] https://clicktime.symantec.com/3Xu74FFughxyNMHvbwUk2Xv6H2?u=https%3A%2F%2Fwww.abbreviations.com%2FMWE


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