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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "ngtcp2_crypto.h"
#include <string.h>
#include <assert.h>
#include "ngtcp2_net.h"
int ngtcp2_crypto_km_new(ngtcp2_crypto_km **pckm, const uint8_t *secret,
size_t secretlen,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *iv, size_t ivlen,
const ngtcp2_mem *mem) {
int rv = ngtcp2_crypto_km_nocopy_new(pckm, secretlen, ivlen, mem);
if (rv != 0) {
return rv;
}
if (secretlen) {
memcpy((*pckm)->secret.base, secret, secretlen);
}
if (aead_ctx) {
(*pckm)->aead_ctx = *aead_ctx;
}
memcpy((*pckm)->iv.base, iv, ivlen);
return 0;
}
int ngtcp2_crypto_km_nocopy_new(ngtcp2_crypto_km **pckm, size_t secretlen,
size_t ivlen, const ngtcp2_mem *mem) {
size_t len;
uint8_t *p;
len = sizeof(ngtcp2_crypto_km) + secretlen + ivlen;
*pckm = ngtcp2_mem_malloc(mem, len);
if (*pckm == NULL) {
return NGTCP2_ERR_NOMEM;
}
p = (uint8_t *)(*pckm) + sizeof(ngtcp2_crypto_km);
(*pckm)->secret.base = p;
(*pckm)->secret.len = secretlen;
p += secretlen;
(*pckm)->iv.base = p;
(*pckm)->iv.len = ivlen;
(*pckm)->aead_ctx.native_handle = NULL;
(*pckm)->pkt_num = -1;
(*pckm)->use_count = 0;
(*pckm)->flags = NGTCP2_CRYPTO_KM_FLAG_NONE;
return 0;
}
void ngtcp2_crypto_km_del(ngtcp2_crypto_km *ckm, const ngtcp2_mem *mem) {
if (ckm == NULL) {
return;
}
if (ckm->secret.len) {
#ifdef WIN32
SecureZeroMemory(ckm->secret.base, ckm->secret.len);
#elif defined(HAVE_EXPLICIT_BZERO)
explicit_bzero(ckm->secret.base, ckm->secret.len);
#elif defined(HAVE_MEMSET_S)
memset_s(ckm->secret.base, ckm->secret.len, 0, ckm->secret.len);
#endif /* HAVE_MEMSET_S */
}
ngtcp2_mem_free(mem, ckm);
}
void ngtcp2_crypto_create_nonce(uint8_t *dest, const uint8_t *iv, size_t ivlen,
int64_t pkt_num) {
size_t i;
uint64_t n;
assert(ivlen >= 8);
memcpy(dest, iv, ivlen);
n = ngtcp2_htonl64((uint64_t)pkt_num);
for (i = 0; i < 8; ++i) {
dest[ivlen - 8 + i] ^= ((uint8_t *)&n)[i];
}
}
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