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Use Dropbear's random source rather than libtommath's platform

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This commit is contained in:
Matt Johnston 2020-10-19 22:49:19 +08:00
parent d5cc5eb25c
commit 4c5b8fb6d6
3 changed files with 15 additions and 2 deletions
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9
crypto_desc.c
View File

@ -3,11 +3,18 @@
#include "crypto_desc.h"
#include "ltc_prng.h"
#include "ecc.h"
#include "dbrandom.h"
#if DROPBEAR_LTC_PRNG
int dropbear_ltc_prng = -1;
#endif
/* Wrapper for libtommath */
static mp_err dropbear_rand_source(void* out, size_t size) {
genrandom((unsigned char*)out, (unsigned int)size);
return MP_OKAY;
}
/* Register the compiled in ciphers.
* This should be run before using any of the ciphers/hashes */
@ -67,6 +74,8 @@ void crypto_init() {
}
#endif
mp_rand_source(dropbear_rand_source);
#if DROPBEAR_ECC
ltc_mp = ltm_desc;
dropbear_ecc_fill_dp();

6
libtommath/bn_mp_rand.c
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@ -3,11 +3,13 @@
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
mp_err(*s_mp_rand_source)(void *out, size_t size) = s_mp_rand_platform;
/* Dropbear sets this separately, avoid platform code */
mp_err(*s_mp_rand_source)(void *out, size_t size) = NULL;
void mp_rand_source(mp_err(*source)(void *out, size_t size))
{
s_mp_rand_source = (source == NULL) ? s_mp_rand_platform : source;
/* Dropbear, don't reset to platform if source==NULL */
s_mp_rand_source = source;
}
mp_err mp_rand(mp_int *a, int digits)

2
libtommath/tommath_class.h
View File

@ -1316,6 +1316,8 @@
#undef BN_S_MP_KARATSUBA_SQR_C
#undef BN_S_MP_TOOM_MUL_C
#undef BN_S_MP_TOOM_SQR_C
/* Dropbear uses its own random source */
#undef BN_S_MP_RAND_PLATFORM_C
#include "dbmalloc.h"
#define MP_MALLOC m_malloc