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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2022 Felix Fietkau <nbd@nbd.name>
*/
#include "edsign.h"
#include "ed25519.h"
#include "auth-data.h"
int unet_auth_data_validate(const uint8_t *key, const void *buf, size_t len,
uint64_t *timestamp, const char **json_data)
{
const struct unet_auth_hdr *hdr = buf;
const struct unet_auth_data *data = net_data_auth_data_hdr(buf);
struct edsign_verify_state vst;
if (len <= sizeof(*hdr) + sizeof(*data))
return -1;
len -= sizeof(*hdr);
if (hdr->magic != cpu_to_be32(UNET_AUTH_MAGIC) ||
hdr->version != 0 || data->flags != 0 ||
data->timestamp == 0)
return -1;
if (key && memcmp(data->pubkey, key, EDSIGN_PUBLIC_KEY_SIZE) != 0)
return -2;
edsign_verify_init(&vst, hdr->signature, data->pubkey);
edsign_verify_add(&vst, data, len);
if (!edsign_verify(&vst, hdr->signature, data->pubkey))
return -3;
if (((char *)data)[len - 1] != 0)
return -2;
if (timestamp)
*timestamp = be64_to_cpu(data->timestamp);
if (json_data)
*json_data = (const char *)(data + 1);
return 0;
}
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