On 03/05/2022 23:29, Kory Hamzeh wrote:
You would have to use EVP_PKEY key type. You can use EVP_PKEY_get* to
get key params.
Yes this is probably the best way to do this.
Specifically you can use the function EVP_PKEY_get_bn_param() documented
here:
https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_get_bn_param.html
The params you want are called OSSL_PKEY_PARAM_EC_PUB_X and
OSSL_PKEY_PARAM_EC_PUB_Y as documented on this page:
https://www.openssl.org/docs/man3.0/man7/EVP_PKEY-EC.html
Matt
On May 3, 2022, at 1:56 PM, Chris Bare <chris.bare@xxxxxxxxx
<mailto:chris.bare@xxxxxxxxx>> wrote:
Thanks, I'll check those out.
On Tue, May 3, 2022 at 4:53 PM William Roberts
<bill.c.roberts@xxxxxxxxx <mailto:bill.c.roberts@xxxxxxxxx>> wrote:
On Tue, May 3, 2022 at 3:18 PM Chris Bare <chris.bare@xxxxxxxxx
<mailto:chris.bare@xxxxxxxxx>> wrote:
>
>
> On Tue, May 3, 2022 at 3:10 PM William Roberts
<bill.c.roberts@xxxxxxxxx <mailto:bill.c.roberts@xxxxxxxxx>> wrote:
>>
>> On Tue, May 3, 2022 at 1:14 PM Chris Bare <chris.bare@xxxxxxxxx
<mailto:chris.bare@xxxxxxxxx>> wrote:
>> >
>> > I'm converting some openssl 1.0 code to 3.0 and I don't know
how to get the coordinates
>> > in a 3.0 way.
>> > The old code is:
>> > BN_CTX *ctx = BN_CTX_new ();
>> > BIGNUM *X = NULL, *Y = NULL;
>> > const EC_POINT *pubkey;
>> > const EC_GROUP *group;
>> > BN_CTX_start (ctx);
>> > X = BN_CTX_get (ctx);
>> > Y = BN_CTX_get (ctx);
>> > pubkey = EC_KEY_get0_public_key ((EC_KEY *) EVP_PKEY_get0
(pkey));
>> > group = EC_KEY_get0_group ((EC_KEY *) EVP_PKEY_get0
(cvr->sm_pkey));
>> > EC_POINT_get_affine_coordinates_GFp (group, pubkey, X, Y, ctx)
>> >
>> > What would be the 3.0 way to get X and Y without using
deprecated functions?
>>
>> For EC_POINT_get_affine_coordinates_GFp it goes to
>> EC_POINT_get_affine_coordinates, see:
>> -
https://www.openssl.org/docs/man3.0/man3/EC_POINT_get_affine_coordinates.html
<https://www.openssl.org/docs/man3.0/man3/EC_POINT_get_affine_coordinates.html>
>>
>> Offhand I don't see any other deprecated functions, was that
the only one?
>>
>> Thanks,
>> Bill
>
>
> all the EC_KEY_get0_ functions are deprecated. Is there a new
way to access the internals of
> the opaque structures, or am I stuck with the deprecated ones
for this?
I think you want the from and to data routines that provide the
components from an EVP PKEY or produce an EVP_PKEY
from the components:
- https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_todata.html
<https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_todata.html>
-
https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_fromdata.html
<https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_fromdata.html>
--
Chris Bare
