HKDF
LCRYPTO_USED(HKDF);
LCRYPTO_ALIAS(HKDF);
int HKDF(uint8_t *out_key, size_t out_len, const EVP_MD *digest,
return HKDF(key, *keylen, kctx->md, kctx->key, kctx->key_len,
HKDF(key, SHA256_DIGEST_LENGTH, md, secret->ptr, secret->len, salt,
if (!HKDF(buf, test->out_len, test->md_func(), test->ikm,