PBKDF2_SHA256
PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, 1, B, p * 128 * r);
PBKDF2_SHA256(passwd, passwdlen, B, p * 128 * r, 1, buf, buflen);
void PBKDF2_SHA256(const uint8_t *, size_t, const uint8_t *, size_t,