ossl_prov_digest_fetch
const EVP_MD *ossl_prov_digest_fetch(PROV_DIGEST *pd, OSSL_LIB_CTX *libctx,
ossl_prov_digest_fetch(pd, ctx, p->data, propquery);
md = ossl_prov_digest_fetch(&psm2ctx->md, psm2ctx->libctx, "SM3", NULL);