HKDF_Extract
return HKDF_Extract(libctx, md, ctx->salt, ctx->salt_len,
if (!HKDF_Extract(libctx, evp_md,
static int HKDF_Extract(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
ret = HKDF_Extract(libctx, md, prevsecret, prevsecretlen,