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crypto: add chacha_drbg

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This commit is contained in:
Ondřej Vejpustek 2020-02-26 17:39:59 +01:00
parent 72cde5a57d
commit d5bfe6b32f
4 changed files with 107 additions and 0 deletions
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1
core/SConscript.firmware
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@ -63,6 +63,7 @@ SOURCE_MOD += [
'vendor/trezor-crypto/chacha20poly1305/chacha_merged.c',
'vendor/trezor-crypto/chacha20poly1305/poly1305-donna.c',
'vendor/trezor-crypto/chacha20poly1305/rfc7539.c',
'vendor/trezor-crypto/chacha_drbg.c',
'vendor/trezor-crypto/curves.c',
'vendor/trezor-crypto/ecdsa.c',
'vendor/trezor-crypto/ed25519-donna/curve25519-donna-32bit.c',

1
core/SConscript.unix
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@ -63,6 +63,7 @@ SOURCE_MOD += [
'vendor/trezor-crypto/chacha20poly1305/chacha_merged.c',
'vendor/trezor-crypto/chacha20poly1305/poly1305-donna.c',
'vendor/trezor-crypto/chacha20poly1305/rfc7539.c',
'vendor/trezor-crypto/chacha_drbg.c',
'vendor/trezor-crypto/ed25519-donna/curve25519-donna-32bit.c',
'vendor/trezor-crypto/ed25519-donna/curve25519-donna-helpers.c',
'vendor/trezor-crypto/ed25519-donna/curve25519-donna-scalarmult-base.c',

62
crypto/chacha_drbg.c Normal file
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@ -0,0 +1,62 @@
/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "chacha_drbg.h"
#include <stdint.h>
#define MAX(a, b) (a) > (b) ? (a) : (b)
void chacha_drbg_init(CHACHA_DRBG_CTX *ctx,
const uint8_t entropy[CHACHA_DRBG_SEED_LENGTH]) {
uint8_t buffer[MAX(CHACHA_DRBG_KEY_LENGTH, CHACHA_DRBG_IV_LENGTH)] = {0};
ECRYPT_keysetup(&ctx->chacha_ctx, buffer, CHACHA_DRBG_KEY_LENGTH * 8,
CHACHA_DRBG_IV_LENGTH * 8);
ECRYPT_ivsetup(&ctx->chacha_ctx, buffer);
chacha_drbg_reseed(ctx, entropy);
}
static void chacha_drbg_update(CHACHA_DRBG_CTX *ctx,
const uint8_t data[CHACHA_DRBG_SEED_LENGTH]) {
uint8_t buffer[CHACHA_DRBG_SEED_LENGTH] = {0};
if (data)
ECRYPT_encrypt_bytes(&ctx->chacha_ctx, data, buffer,
CHACHA_DRBG_SEED_LENGTH);
else
ECRYPT_keystream_bytes(&ctx->chacha_ctx, buffer, CHACHA_DRBG_SEED_LENGTH);
ECRYPT_keysetup(&ctx->chacha_ctx, buffer, CHACHA_DRBG_KEY_LENGTH * 8,
CHACHA_DRBG_IV_LENGTH * 8);
ECRYPT_ivsetup(&ctx->chacha_ctx, buffer + CHACHA_DRBG_KEY_LENGTH);
}
void chacha_drbg_generate(CHACHA_DRBG_CTX *ctx, uint8_t *output,
uint8_t output_length) {
ECRYPT_keystream_bytes(&ctx->chacha_ctx, output, output_length);
chacha_drbg_update(ctx, NULL);
ctx->reseed_counter++;
}
void chacha_drbg_reseed(CHACHA_DRBG_CTX *ctx,
const uint8_t entropy[CHACHA_DRBG_SEED_LENGTH]) {
chacha_drbg_update(ctx, entropy);
ctx->reseed_counter = 1;
}

43
crypto/chacha_drbg.h Normal file
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@ -0,0 +1,43 @@
/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __CHACHA_DRBG__
#define __CHACHA_DRBG__
#include "chacha20poly1305/chacha20poly1305.h"
// Very fast deterministic random bit generator inspired by CTR_DRBG in NIST SP
// 800-90A
#define CHACHA_DRBG_KEY_LENGTH 16
#define CHACHA_DRBG_IV_LENGTH 8
#define CHACHA_DRBG_SEED_LENGTH (CHACHA_DRBG_KEY_LENGTH + CHACHA_DRBG_IV_LENGTH)
typedef struct _CHACHA_DRBG_CTX {
ECRYPT_ctx chacha_ctx;
uint32_t reseed_counter;
} CHACHA_DRBG_CTX;
void chacha_drbg_init(CHACHA_DRBG_CTX *ctx,
const uint8_t entropy[CHACHA_DRBG_SEED_LENGTH]);
void chacha_drbg_reseed(CHACHA_DRBG_CTX *ctx,
const uint8_t entropy[CHACHA_DRBG_SEED_LENGTH]);
void chacha_drbg_generate(CHACHA_DRBG_CTX *ctx, uint8_t *output,
uint8_t output_length);
#endif // __CHACHA_DRBG__