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/* Copyright (c) 2015, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "cryptobox.h"
#include "platform_config.h"
#include "chacha20/chacha.h"
#include "poly1305/poly1305.h"
#include "curve25519/curve25519.h"
#include "ottery.h"
#ifdef HAVE_CPUID_H
#include <cpuid.h>
#endif
unsigned long cpu_config = 0;
static const guchar n0[16] = {0};
#ifdef HAVE_WEAK_SYMBOLS
__attribute__((weak)) void
_dummy_symbol_to_prevent_lto(void * const pnt, const size_t len)
{
(void) pnt;
(void) len;
}
#endif
void
rspamd_explicit_memzero(void * const pnt, const gsize len)
{
#if defined(HAVE_MEMSET_S)
if (memset_s (pnt, (rsize_t) len, 0, (rsize_t) len) != 0) {
g_assert (0);
}
#elif defined(HAVE_EXPLICIT_BZERO)
explicit_bzero (pnt, len);
#elif defined(HAVE_WEAK_SYMBOLS)
memset (pnt, 0, len);
_dummy_symbol_to_prevent_lto (pnt, len);
#else
volatile unsigned char *pnt_ = (volatile unsigned char *) pnt;
gsize i = (gsize) 0U;
while (i < len) {
pnt_[i++] = 0U;
}
#endif
}
static void
rspamd_cryptobox_cpuid (gint cpu[4], gint info)
{
#if defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))
# if defined(HAVE_GET_CPUID)
__get_cpuid (info, &cpu[0], &cpu[1], &cpu[2], &cpu[3]);
# else
__asm__ __volatile__ (
"cpuid":
"=a" (cpu[0]),
"=b" (cpu[1]),
"=c" (cpu[2]),
"=d" (cpu[3]) :
"a" (info), "c" (0)
);
# endif
#else
memset (cpu, 0, sizeof (cpu));
#endif
}
void
rspamd_cryptobox_init (void)
{
gint cpu[4], nid;
rspamd_cryptobox_cpuid (cpu, 0);
nid = cpu[0];
rspamd_cryptobox_cpuid (cpu, 1);
if (nid > 1) {
/* Check OSXSAVE bit first of all */
if ((cpu[2] & ((gint)1 << 9))) {
if ((cpu[3] & ((gint)1 << 26))) {
cpu_config |= CPUID_SSE2;
}
if ((cpu[2] & ((gint)1 << 28))) {
cpu_config |= CPUID_AVX;
}
if (nid > 7) {
rspamd_cryptobox_cpuid (cpu, 7);
if ((cpu[1] & ((gint)1 << 5))) {
cpu_config |= CPUID_AVX2;
}
}
}
}
chacha_load ();
poly1305_load ();
}
void
rspamd_cryptobox_keypair (rspamd_pk_t pk, rspamd_sk_t sk)
{
ottery_rand_bytes (sk, rspamd_cryptobox_SKBYTES);
sk[0] &= 248;
sk[31] &= 127;
sk[31] |= 64;
curve25519 (pk, sk, curve25519_basepoint);
}
void
rspamd_cryptobox_nm (rspamd_nm_t nm, const rspamd_pk_t pk, const rspamd_sk_t sk)
{
guchar s[rspamd_cryptobox_PKBYTES];
guchar e[rspamd_cryptobox_SKBYTES];
memcpy (e, sk, rspamd_cryptobox_SKBYTES);
e[0] &= 248;
e[31] &= 127;
e[31] |= 64;
curve25519 (s, e, pk);
hchacha (s, n0, nm, 20);
rspamd_explicit_memzero (e, rspamd_cryptobox_SKBYTES);
}
void rspamd_cryptobox_encrypt_nm_inplace (guchar *data, gsize len,
const rspamd_nonce_t nonce,
const rspamd_nm_t nm, rspamd_sig_t sig)
{
poly1305_state mac_ctx;
guchar subkey[CHACHA_BLOCKBYTES];
chacha_state s;
gsize r;
xchacha_init (&s, (const chacha_key *)nm, (const chacha_iv24 *)nonce, 20);
memset (subkey, 0, sizeof (subkey));
chacha_update (&s, subkey, subkey, sizeof (subkey));
r = chacha_update (&s, data, data, len);
chacha_final (&s, data + r);
poly1305_init (&mac_ctx, (const poly1305_key *)subkey);
poly1305_update (&mac_ctx, data, len);
poly1305_finish (&mac_ctx, sig);
rspamd_explicit_memzero (&mac_ctx, sizeof (mac_ctx));
rspamd_explicit_memzero (subkey, sizeof (subkey));
}
gboolean
rspamd_cryptobox_decrypt_nm_inplace (guchar *data, gsize len,
const rspamd_nonce_t nonce, const rspamd_nm_t nm, const rspamd_sig_t sig)
{
poly1305_state mac_ctx;
guchar subkey[CHACHA_BLOCKBYTES];
rspamd_sig_t mac;
chacha_state s;
gsize r;
gboolean ret = TRUE;
/* Generate MAC key */
xchacha_init (&s, (const chacha_key *)nm, (const chacha_iv24 *)nonce, 20);
memset (subkey, 0, sizeof (subkey));
chacha_update (&s, subkey, subkey, sizeof (subkey));
poly1305_init (&mac_ctx, (const poly1305_key *)subkey);
poly1305_update (&mac_ctx, data, len);
poly1305_finish (&mac_ctx, mac);
if (!poly1305_verify (mac, sig)) {
ret = FALSE;
}
else {
r = chacha_update (&s, data, data, len);
chacha_final (&s, data + r);
}
rspamd_explicit_memzero (&mac_ctx, sizeof (mac_ctx));
rspamd_explicit_memzero (subkey, sizeof (subkey));
return ret;
}
gboolean
rspamd_cryptobox_decrypt_inplace (guchar *data, gsize len,
const rspamd_nonce_t nonce,
const rspamd_pk_t pk, const rspamd_sk_t sk, const rspamd_sig_t sig)
{
guchar nm[rspamd_cryptobox_NMBYTES];
gboolean ret;
rspamd_cryptobox_nm (nm, pk, sk);
ret = rspamd_cryptobox_decrypt_nm_inplace (data, len, nonce, nm, sig);
rspamd_explicit_memzero (nm, sizeof (nm));
return ret;
}
void
rspamd_cryptobox_encrypt_inplace (guchar *data, gsize len,
const rspamd_nonce_t nonce,
const rspamd_pk_t pk, const rspamd_sk_t sk, rspamd_sig_t sig)
{
guchar nm[rspamd_cryptobox_NMBYTES];
rspamd_cryptobox_nm (nm, pk, sk);
rspamd_cryptobox_encrypt_nm_inplace (data, len, nonce, nm, sig);
rspamd_explicit_memzero (nm, sizeof (nm));
}
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