Caveat: I've not tested or compiled the following...but something like this:
if (EVP_PKEY_is_a(evpKey, "RSA)) {
keysz = EVP_PKEY_get_bits(evpKey) / 8;
/* some code */
} else if (EVP_PKEY_is_a(evpKey, "EC")) {
char *name;
size_t namesize;
if (!EVP_PKEY_get_utf8_string_param(pkey,
OSSL_PKEY_PARAM_GROUP_NAME,
NULL, 0, &namesize))
/* error */;
name = OPENSSL_malloc(namesize + 1);
if (name == NULL)
/* error */
if (!EVP_PKEY_get_utf8_string_param(pkey,
OSSL_PKEY_PARAM_GROUP_NAME,
name, namesize + 1, 0))
/* error */
/* This gets you the curve name as a string. If you really need as
* an integer you can additionally do the following - but note that
* some providers might add curves that libcrypto doesn't know about
* so this could fail
*/
ecGrpId = OBJ_txt2nid(name);
if (ecGrpId == NID_undef)
/* error */;
OPENSSL_free(name);
/* some code */
}
On 25/10/2021 10:21, Paramashivaiah, Sunil wrote:
Hi Matt,
Thanks for the reply. I need to replace the below code.
int keysz,ecGrpId;
switch(evpKey->type)
{
case NID_rsaEncryption:
{
if(evpKey->pkey.rsa)
{
keysz = BN_num_bits(evpKey->pkey.rsa->n);
.
.
/* some code */
}
break;
}
case NID_X9_62_id_ecPublicKey:
{
ecGrpId = EC_GROUP_get_curve_name(evpKey->pkey.ec->group);
/* some code follows*/
Thanks and Regards,
Sunil
-----Original Message-----
From: Matt Caswell <matt@xxxxxxxxxxx>
Sent: Monday, October 25, 2021 2:23 PM
To: Paramashivaiah, Sunil <Sunil.Paramashivaiah@xxxxxxxx>; openssl-users@xxxxxxxxxxx
Subject: [EXTERNAL] Re: Need Help for Code Changes to Upgrade from OpenSSL 1.0.2 to 3.0
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://clicktime.symantec.com/3TPr6AZe5xYBkrduooQtHHv6H2?u=https%3A%2F%2Fwww.openssl.org%2Fdocs%2Fman3.0%2Fman3%2FEVP_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://clicktime.symantec.com/36qEeyKryNCZ32uxNgfFe4p6H2?u=https%3A%2F%2Fwww.openssl.org%2Fdocs%2Fman3.0%2Fman3%2FEVP_PKEY_get_utf8_string_param.html
Matt
Thanks and Regards,
Sunil
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