On 25/10/2021 05:45, Paramashivaiah, Sunil wrote:
Hi All,
I need get APIs for accessing the members of EVP_PKEY. Please
suggest APIs to get following members of EVP_PKEY
evpkey->type , evpkey->pkey.rsa , pubKey->pkey.ec->group.
EVP_PKEY_get_id() will get you the `evpkey->type` value. But note that
in the provider world an external provider could add key types that are
unknown to libcrypto. "EVP_PKEY_is_a" is a more future proof way to go.
https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_is_a.html
E.g.
if (EVP_PKEY_is_a(pkey, "RSA")) ...;
if (EVP_PKEY_is_a(pkey, "EC")) ...;
The "evppkey->pkey.rsa" value can be obtained via EVP_PKEY_get0_RSA()
but note that this is deprecated. You are encouraged to not use the RSA
structure at all in 3.0 (all the functions that take an RSA structure
are deprecated). So you should look at what you are trying to do with
evpkey->pkey.rsa and refactor things to not need it. Why do you want this?
Similar comments apply to "pubkey->pkey.ec". You can get the EC_KEY
object using EVP_PKEY_get0_EC_KEY() but this is deprecated. You can get
the group from an EC_KEY using EC_KEY_get0_group() - but this is also
deprecated. Instead you might consider getting the "group name" for the
EC key which will tell you what curve is in use, e.g.
EVP_PKEY_get_utf8_string_param(pkey, OSSL_PKEY_PARAM_GROUP_NAME,
NULL, 0, &namesize);
name = OPENSSL_malloc(namesize + 1);
EVP_PKEY_get_utf8_string_param(pkey, OSSL_PKEY_PARAM_GROUP_NAME,
name, namesize + 1, 0);
https://www.openssl.org/docs/man3.0/man3/EVP_PKEY_get_utf8_string_param.html
Matt
Thanks and Regards,
Sunil
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