On 10/11/2023 16:05, Juan di Mauro wrote:
Dear all,
I'm coding an external provider for OpenSSL to incorporate a KEM
algorithm (the provider will be compiled as a .so as usual). I have the
KEM part of the code
and the Key management module (the OSSL_ALGORITHM dispatch tables and so
on, corresponding to the OSSL_OP_KEM and OSSL_OP_KEYMGMT query types).
However, I have problems making things interact ok. It's clear that
I do not fully understand the way the API should work in this case so my
first question is: Is there a complete documented guide about that?
Secondly, to state things clearly: I want to make key encapsulation and
I'm following this sequence of API calls to interact with my provider:
EVP_PKEY_CTX *ctx;
ctx = EVP_PKEY_CTX_new_from_name(libctx,<Name of my Keymgmt
algorithm>,NULL);
if (!ctx){
printf("The context can't be created. Exiting\n");
return -1;
}
//generate the key
EVP_PKEY *key = NULL;
EVP_PKEY_keygen_init(ctx);
EVP_PKEY_keygen(ctx, &key);
// Here, since the pkey in context is NULL, fails
int res_encaps_init = EVP_PKEY_encapsulate_init(ctx,NULL);
Since you are starting a new operation here you should probably use a
new pkey ctx created via EVP_PKEY_CTX_new_from_pkey() rather than trying
to reuse the old one.
Matt
So, maybe the sequence of steps is wrong or my code doesn't satisfy the
API requirements.
Thanks in advance,
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