Hi Matt,
We are using MEM type BIO. similar to the openssl library ‘BIO_TYPE_MEM ‘ we have an internal type defined like ex:- ‘BIO_TYPE_XYZ_MEM’ and all other mem utilities are internally defined.
Like XYZ_mem_new/XYZ_mem_read … etc these utilities are accessing the bio_st variable ‘num’.
please suggest set/get utilities to handle this scenario.
Regards,
Sunil
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Today's Topics:
1. set/get utilities are not available to access variable
'num' of structure bio_st (Narayana, Sunil Kumar)
2. Re: set/get utilities are not available to access variable
'num' of structure bio_st (Matt Caswell)
3. EC curve preferences (Skip Carter)
4. RE: EC curve preferences (Michael Wojcik)
----------------------------------------------------------------------
Message: 1
Date: Fri, 20 Nov 2020 13:46:00 +0000
From: "Narayana, Sunil Kumar" <sanarayana@xxxxxxxx>
To: "openssl-users@xxxxxxxxxxx" <openssl-users@xxxxxxxxxxx>
Subject: set/get utilities are not available to access variable
'num' of structure bio_st
Message-ID:
<SN6PR03MB4061A9FF473DE74B064A1D8DB0FF0@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"
Hi ,
We are porting our Application from openssl 1.0.1 to openssl 3.0. In related to this activity we require to access the variable 'num' of structure bio_st.
In older versions the variable was accessed to set and get value using pointer operator (bi->num ).
Since this is not allowed in 3.0 we are looking for the Get/Set utilities similar to other member (BIO_set_flags/ BIO_get_flags)
Is this not supported in 3.0 ? If yes, Please guide the proper alternatives.
Regards,
Sunil
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Message: 2
Date: Fri, 20 Nov 2020 13:55:34 +0000
From: Matt Caswell <matt@xxxxxxxxxxx>
To: openssl-users@xxxxxxxxxxx
Subject: Re: set/get utilities are not available to access variable
'num' of structure bio_st
Message-ID: <53108b39-21f8-dea0-c3c3-fe5517a5613f@xxxxxxxxxxx>
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On 20/11/2020 13:46, Narayana, Sunil Kumar wrote:
> Hi ,
>
> ??????????????? We are porting our Application from ?openssl 1.0.1 to
> openssl 3.0. In related to this activity we require to access the
> variable ?*num*? of structure *bio_st. *
>
> In older versions the variable was accessed to set and get value using
> pointer operator (bi->num ).
>
> Since this is not allowed in 3.0 we are looking for the Get/Set
> utilities similar to other member*(BIO_set_flags/ BIO_get_flags) *
>
> ?
>
> Is this not supported in 3.0 ? If yes, Please guide the proper alternatives.
What kind of BIO are you using? Different BIOs may provide different
mechanisms to get hold of this value. For example a number of file
descriptor based BIOs provide BIO_get_fd().
Matt
------------------------------
Message: 3
Date: Fri, 20 Nov 2020 08:43:59 -0800
From: Skip Carter <skip@xxxxxxxxxxx>
To: OpenSSL Users <openssl-users@xxxxxxxxxxx>
Subject: EC curve preferences
Message-ID: <1605890639.1675.24.camel@xxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"
I am sure this in the documentation somewhere; but where ?
What are the preferred ECDH curves for a given keysize ? Which curves
are considered obsolete/deprecated/untrustworthy ?
--
Dr Everett (Skip) Carter??0xF29BF36844FB7922
skip@xxxxxxxxxxx
Taygeta Scientific Inc
607 Charles Ave
Seaside CA 93955
831-641-0645 x103
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Message: 4
Date: Fri, 20 Nov 2020 18:03:22 +0000
From: Michael Wojcik <Michael.Wojcik@xxxxxxxxxxxxxx>
To: Skip Carter <skip@xxxxxxxxxxx>, OpenSSL Users
<openssl-users@xxxxxxxxxxx>
Subject: RE: EC curve preferences
Message-ID:
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> From: openssl-users <openssl-users-bounces@xxxxxxxxxxx> On Behalf Of Skip
> Carter
> Sent: Friday, 20 November, 2020 09:44
>
> What are the preferred ECDH curves for a given keysize ? Which curves
> are considered obsolete/deprecated/untrustworthy ?
For TLSv1.3, this is easy. RFC 8446 B.3.1.4 only allows the following: secp256r1(0x0017), secp384r1(0x0018), secp521r1(0x0019), x25519(0x001D), x448(0x001E). Those are your choices. If you want interoperability, enable them all; if you want maximum security,
only use X25519 and X448. See safecurves.cr.yp.to for the arguments in favor of the latter position.
Frankly, unless you're dealing with something of very high value or that needs to resist breaking for a long time, I don't see any real-world risk in using the SEC 2 curves. You might want to disallow just secp256r1 if you're concerned about that key size becoming
tractable under new attacks or quantum computing within your threat timeframe. Ultimately, this is a question for your threat model.
For TLSv1.2, well...
- Some people recommend avoiding non-prime curves (i.e. over binary fields, such as the sect* ones) for intellectual-property reasons. I'm not going to try to get into that, because IANAL and even if I were, I wouldn't touch that without a hefty retainer.
- Current consensus, more or less, seems to be to use named curves and not custom ones. The arguments for that seem pretty persuasive to me. So don't use custom curves.
- Beyond that? Well, here's one Stack Exchange response from Thomas Pornin (who knows a hell of a lot more about this stuff than I do) where he suggests using just prime256v1 (which is the same as secp256r1 I believe?) and secp384r1:
https://security.stackexchange.com/questions/78621/which-elliptic-curve-should-i-use
Those are the curves in Suite B, before the NSA decided to emit vague warnings about ECC. They subsequently decided P384 aka secp384r1 is OK until post-quantum primitives are standardized. So if your application prefers secp384r1 for TLSv1.2, then you can decide
whether to also allow prime256v1 for interoperability. Again, that's a question for your threat model.
All that said, some people will have different, and quite possibly better-informed, opinions on this.
--
Michael Wojcik
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