Return the library context associated with a key algorithm context.
Declared in <openssl/evp.h>
<openssl/evp.h>
OSSL_LIB_CTX* EVP_PKEY_CTX_get0_libctx(EVP_PKEY_CTX* ctx);
OSSL_LIB_CTX used when ctx was constructed, or NULL for the default.
ctx