236 lines
6.9 KiB
C++
236 lines
6.9 KiB
C++
#pragma once
|
|
|
|
/*
|
|
sha-256 implementation for MAVLink based on Heimdal sources, with
|
|
modifications to suit mavlink headers
|
|
*/
|
|
/*
|
|
* Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. 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.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 THE INSTITUTE OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
/*
|
|
allow implementation to provide their own sha256 with the same API
|
|
*/
|
|
#ifndef HAVE_MAVLINK_SHA256
|
|
|
|
#ifdef MAVLINK_USE_CXX_NAMESPACE
|
|
namespace mavlink {
|
|
#endif
|
|
|
|
#ifndef MAVLINK_HELPER
|
|
#define MAVLINK_HELPER
|
|
#endif
|
|
|
|
typedef struct {
|
|
uint32_t sz[2];
|
|
uint32_t counter[8];
|
|
union {
|
|
unsigned char save_bytes[64];
|
|
uint32_t save_u32[16];
|
|
} u;
|
|
} mavlink_sha256_ctx;
|
|
|
|
#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
|
|
#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
|
|
|
|
#define ROTR(x,n) (((x)>>(n)) | ((x) << (32 - (n))))
|
|
|
|
#define Sigma0(x) (ROTR(x,2) ^ ROTR(x,13) ^ ROTR(x,22))
|
|
#define Sigma1(x) (ROTR(x,6) ^ ROTR(x,11) ^ ROTR(x,25))
|
|
#define sigma0(x) (ROTR(x,7) ^ ROTR(x,18) ^ ((x)>>3))
|
|
#define sigma1(x) (ROTR(x,17) ^ ROTR(x,19) ^ ((x)>>10))
|
|
|
|
static const uint32_t mavlink_sha256_constant_256[64] = {
|
|
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
|
|
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
|
|
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
|
|
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
|
|
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
|
|
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
|
|
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
|
|
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
|
|
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
|
|
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
|
|
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
|
|
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
|
|
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
|
|
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
|
|
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
|
|
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
|
|
};
|
|
|
|
MAVLINK_HELPER void mavlink_sha256_init(mavlink_sha256_ctx *m)
|
|
{
|
|
m->sz[0] = 0;
|
|
m->sz[1] = 0;
|
|
m->counter[0] = 0x6a09e667;
|
|
m->counter[1] = 0xbb67ae85;
|
|
m->counter[2] = 0x3c6ef372;
|
|
m->counter[3] = 0xa54ff53a;
|
|
m->counter[4] = 0x510e527f;
|
|
m->counter[5] = 0x9b05688c;
|
|
m->counter[6] = 0x1f83d9ab;
|
|
m->counter[7] = 0x5be0cd19;
|
|
}
|
|
|
|
static inline void mavlink_sha256_calc(mavlink_sha256_ctx *m, uint32_t *in)
|
|
{
|
|
uint32_t AA, BB, CC, DD, EE, FF, GG, HH;
|
|
uint32_t data[64];
|
|
int i;
|
|
|
|
AA = m->counter[0];
|
|
BB = m->counter[1];
|
|
CC = m->counter[2];
|
|
DD = m->counter[3];
|
|
EE = m->counter[4];
|
|
FF = m->counter[5];
|
|
GG = m->counter[6];
|
|
HH = m->counter[7];
|
|
|
|
for (i = 0; i < 16; ++i)
|
|
data[i] = in[i];
|
|
for (i = 16; i < 64; ++i)
|
|
data[i] = sigma1(data[i-2]) + data[i-7] +
|
|
sigma0(data[i-15]) + data[i - 16];
|
|
|
|
for (i = 0; i < 64; i++) {
|
|
uint32_t T1, T2;
|
|
|
|
T1 = HH + Sigma1(EE) + Ch(EE, FF, GG) + mavlink_sha256_constant_256[i] + data[i];
|
|
T2 = Sigma0(AA) + Maj(AA,BB,CC);
|
|
|
|
HH = GG;
|
|
GG = FF;
|
|
FF = EE;
|
|
EE = DD + T1;
|
|
DD = CC;
|
|
CC = BB;
|
|
BB = AA;
|
|
AA = T1 + T2;
|
|
}
|
|
|
|
m->counter[0] += AA;
|
|
m->counter[1] += BB;
|
|
m->counter[2] += CC;
|
|
m->counter[3] += DD;
|
|
m->counter[4] += EE;
|
|
m->counter[5] += FF;
|
|
m->counter[6] += GG;
|
|
m->counter[7] += HH;
|
|
}
|
|
|
|
MAVLINK_HELPER void mavlink_sha256_update(mavlink_sha256_ctx *m, const void *v, uint32_t len)
|
|
{
|
|
const unsigned char *p = (const unsigned char *)v;
|
|
uint32_t old_sz = m->sz[0];
|
|
uint32_t offset;
|
|
|
|
m->sz[0] += len * 8;
|
|
if (m->sz[0] < old_sz)
|
|
++m->sz[1];
|
|
offset = (old_sz / 8) % 64;
|
|
while(len > 0){
|
|
uint32_t l = 64 - offset;
|
|
if (len < l) {
|
|
l = len;
|
|
}
|
|
memcpy(m->u.save_bytes + offset, p, l);
|
|
offset += l;
|
|
p += l;
|
|
len -= l;
|
|
if(offset == 64){
|
|
int i;
|
|
uint32_t current[16];
|
|
const uint32_t *u = m->u.save_u32;
|
|
for (i = 0; i < 16; i++){
|
|
const uint8_t *p1 = (const uint8_t *)&u[i];
|
|
uint8_t *p2 = (uint8_t *)¤t[i];
|
|
p2[0] = p1[3];
|
|
p2[1] = p1[2];
|
|
p2[2] = p1[1];
|
|
p2[3] = p1[0];
|
|
}
|
|
mavlink_sha256_calc(m, current);
|
|
offset = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
get first 48 bits of final sha256 hash
|
|
*/
|
|
MAVLINK_HELPER void mavlink_sha256_final_48(mavlink_sha256_ctx *m, uint8_t result[6])
|
|
{
|
|
unsigned char zeros[72];
|
|
unsigned offset = (m->sz[0] / 8) % 64;
|
|
unsigned int dstart = (120 - offset - 1) % 64 + 1;
|
|
uint8_t *p = (uint8_t *)&m->counter[0];
|
|
|
|
*zeros = 0x80;
|
|
memset (zeros + 1, 0, sizeof(zeros) - 1);
|
|
zeros[dstart+7] = (m->sz[0] >> 0) & 0xff;
|
|
zeros[dstart+6] = (m->sz[0] >> 8) & 0xff;
|
|
zeros[dstart+5] = (m->sz[0] >> 16) & 0xff;
|
|
zeros[dstart+4] = (m->sz[0] >> 24) & 0xff;
|
|
zeros[dstart+3] = (m->sz[1] >> 0) & 0xff;
|
|
zeros[dstart+2] = (m->sz[1] >> 8) & 0xff;
|
|
zeros[dstart+1] = (m->sz[1] >> 16) & 0xff;
|
|
zeros[dstart+0] = (m->sz[1] >> 24) & 0xff;
|
|
|
|
mavlink_sha256_update(m, zeros, dstart + 8);
|
|
|
|
// this ordering makes the result consistent with taking the first
|
|
// 6 bytes of more conventional sha256 functions. It assumes
|
|
// little-endian ordering of m->counter
|
|
result[0] = p[3];
|
|
result[1] = p[2];
|
|
result[2] = p[1];
|
|
result[3] = p[0];
|
|
result[4] = p[7];
|
|
result[5] = p[6];
|
|
}
|
|
|
|
// prevent conflicts with users of the header
|
|
#undef Ch
|
|
#undef ROTR
|
|
#undef Sigma0
|
|
#undef Sigma1
|
|
#undef sigma0
|
|
#undef sigma1
|
|
|
|
#ifdef MAVLINK_USE_CXX_NAMESPACE
|
|
} // namespace mavlink
|
|
#endif
|
|
|
|
#endif // HAVE_MAVLINK_SHA256
|