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/*
* Copyright (c) 2022 Rubicon Communications, LLC.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <wireguard/wireguard.h>
#include <wireguard/wireguard_chachapoly.h>
#include <wireguard/wireguard_hchacha20.h>
bool
wg_chacha20poly1305_calc (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst,
u8 *aad, u32 aad_len, u64 nonce,
vnet_crypto_op_id_t op_id,
vnet_crypto_key_index_t key_index)
{
vnet_crypto_op_t _op, *op = &_op;
u8 iv[12];
u8 tag_[NOISE_AUTHTAG_LEN] = {};
u8 src_[] = {};
clib_memset (iv, 0, 12);
clib_memcpy (iv + 4, &nonce, sizeof (nonce));
vnet_crypto_op_init (op, op_id);
op->tag_len = NOISE_AUTHTAG_LEN;
if (op_id == VNET_CRYPTO_OP_CHACHA20_POLY1305_DEC)
{
op->tag = src + src_len - NOISE_AUTHTAG_LEN;
src_len -= NOISE_AUTHTAG_LEN;
op->flags |= VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
}
else
op->tag = tag_;
op->src = !src ? src_ : src;
op->len = src_len;
op->dst = dst;
op->key_index = key_index;
op->aad = aad;
op->aad_len = aad_len;
op->iv = iv;
vnet_crypto_process_ops (vm, op, 1);
if (op_id == VNET_CRYPTO_OP_CHACHA20_POLY1305_ENC)
{
clib_memcpy (dst + src_len, op->tag, NOISE_AUTHTAG_LEN);
}
return (op->status == VNET_CRYPTO_OP_STATUS_COMPLETED);
}
void
wg_xchacha20poly1305_encrypt (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst,
u8 *aad, u32 aad_len,
u8 nonce[XCHACHA20POLY1305_NONCE_SIZE],
u8 key[CHACHA20POLY1305_KEY_SIZE])
{
int i;
u32 derived_key[CHACHA20POLY1305_KEY_SIZE / sizeof (u32)];
u64 h_nonce;
clib_memcpy (&h_nonce, nonce + 16, sizeof (h_nonce));
h_nonce = le64toh (h_nonce);
hchacha20 (derived_key, nonce, key);
for (i = 0; i < (sizeof (derived_key) / sizeof (derived_key[0])); i++)
(derived_key[i]) = htole32 ((derived_key[i]));
uint32_t key_idx;
key_idx =
vnet_crypto_key_add (vm, VNET_CRYPTO_ALG_CHACHA20_POLY1305,
(uint8_t *) derived_key, CHACHA20POLY1305_KEY_SIZE);
wg_chacha20poly1305_calc (vm, src, src_len, dst, aad, aad_len, h_nonce,
VNET_CRYPTO_OP_CHACHA20_POLY1305_ENC, key_idx);
vnet_crypto_key_del (vm, key_idx);
wg_secure_zero_memory (derived_key, CHACHA20POLY1305_KEY_SIZE);
}
bool
wg_xchacha20poly1305_decrypt (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst,
u8 *aad, u32 aad_len,
u8 nonce[XCHACHA20POLY1305_NONCE_SIZE],
u8 key[CHACHA20POLY1305_KEY_SIZE])
{
int ret, i;
u32 derived_key[CHACHA20POLY1305_KEY_SIZE / sizeof (u32)];
u64 h_nonce;
clib_memcpy (&h_nonce, nonce + 16, sizeof (h_nonce));
h_nonce = le64toh (h_nonce);
hchacha20 (derived_key, nonce, key);
for (i = 0; i < (sizeof (derived_key) / sizeof (derived_key[0])); i++)
(derived_key[i]) = htole32 ((derived_key[i]));
uint32_t key_idx;
key_idx =
vnet_crypto_key_add (vm, VNET_CRYPTO_ALG_CHACHA20_POLY1305,
(uint8_t *) derived_key, CHACHA20POLY1305_KEY_SIZE);
ret =
wg_chacha20poly1305_calc (vm, src, src_len, dst, aad, aad_len, h_nonce,
VNET_CRYPTO_OP_CHACHA20_POLY1305_DEC, key_idx);
vnet_crypto_key_del (vm, key_idx);
wg_secure_zero_memory (derived_key, CHACHA20POLY1305_KEY_SIZE);
return ret;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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