mirror of
https://github.com/trezor/trezor-firmware.git
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308 lines
10 KiB
C
308 lines
10 KiB
C
/**
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* Copyright (c) 2013-2021 SatoshiLabs
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include "bignum.h"
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#include "bip32.h"
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#include "cardano.h"
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#include "curves.h"
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#include "hasher.h"
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#include "hmac.h"
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#include "memzero.h"
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#include "options.h"
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#include "pbkdf2.h"
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#include "sha2.h"
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#if USE_CARDANO
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#define CARDANO_MAX_NODE_DEPTH 1048576
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const curve_info ed25519_cardano_info = {
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.bip32_name = ED25519_CARDANO_NAME,
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.params = NULL,
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.hasher_base58 = HASHER_SHA2D,
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.hasher_sign = HASHER_SHA2D,
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.hasher_pubkey = HASHER_SHA2_RIPEMD,
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.hasher_script = HASHER_SHA2,
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};
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static void scalar_multiply8(const uint8_t *src, int bytes, uint8_t *dst) {
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uint8_t prev_acc = 0;
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for (int i = 0; i < bytes; i++) {
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dst[i] = (src[i] << 3) + (prev_acc & 0x7);
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prev_acc = src[i] >> 5;
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}
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dst[bytes] = src[bytes - 1] >> 5;
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}
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static void scalar_add_256bits(const uint8_t *src1, const uint8_t *src2,
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uint8_t *dst) {
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uint16_t r = 0;
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for (int i = 0; i < 32; i++) {
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r = r + (uint16_t)src1[i] + (uint16_t)src2[i];
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dst[i] = r & 0xff;
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r >>= 8;
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}
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}
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static void cardano_ed25519_tweak_bits(uint8_t private_key[32]) {
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private_key[0] &= 0xf8;
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private_key[31] &= 0x1f;
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private_key[31] |= 0x40;
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}
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int hdnode_private_ckd_cardano(HDNode *inout, uint32_t index) {
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if (inout->curve != &ed25519_cardano_info) {
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return 0;
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}
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if (inout->depth >= CARDANO_MAX_NODE_DEPTH) {
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return 0;
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}
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// checks for hardened/non-hardened derivation, keysize 32 means we are
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// dealing with public key and thus non-h, keysize 64 is for private key
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int keysize = 32;
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if (index & 0x80000000) {
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keysize = 64;
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}
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static CONFIDENTIAL uint8_t data[1 + 64 + 4];
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static CONFIDENTIAL uint8_t z[32 + 32];
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static CONFIDENTIAL uint8_t priv_key[64];
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static CONFIDENTIAL uint8_t res_key[64];
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write_le(data + keysize + 1, index);
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memcpy(priv_key, inout->private_key, 32);
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memcpy(priv_key + 32, inout->private_key_extension, 32);
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if (keysize == 64) { // private derivation
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data[0] = 0;
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memcpy(data + 1, inout->private_key, 32);
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memcpy(data + 1 + 32, inout->private_key_extension, 32);
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} else { // public derivation
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if (hdnode_fill_public_key(inout) != 0) {
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return 0;
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}
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data[0] = 2;
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memcpy(data + 1, inout->public_key + 1, 32);
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}
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static CONFIDENTIAL HMAC_SHA512_CTX ctx;
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hmac_sha512_Init(&ctx, inout->chain_code, 32);
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hmac_sha512_Update(&ctx, data, 1 + keysize + 4);
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hmac_sha512_Final(&ctx, z);
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static CONFIDENTIAL uint8_t zl8[32];
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memzero(zl8, 32);
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/* get 8 * Zl */
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scalar_multiply8(z, 28, zl8);
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/* Kl = 8*Zl + parent(K)l */
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scalar_add_256bits(zl8, priv_key, res_key);
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/* Kr = Zr + parent(K)r */
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scalar_add_256bits(z + 32, priv_key + 32, res_key + 32);
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memcpy(inout->private_key, res_key, 32);
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memcpy(inout->private_key_extension, res_key + 32, 32);
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if (keysize == 64) {
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data[0] = 1;
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} else {
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data[0] = 3;
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}
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hmac_sha512_Init(&ctx, inout->chain_code, 32);
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hmac_sha512_Update(&ctx, data, 1 + keysize + 4);
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hmac_sha512_Final(&ctx, z);
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memcpy(inout->chain_code, z + 32, 32);
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inout->depth++;
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inout->child_num = index;
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memzero(inout->public_key, sizeof(inout->public_key));
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inout->is_public_key_set = false;
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// making sure to wipe our memory
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memzero(z, sizeof(z));
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memzero(data, sizeof(data));
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memzero(priv_key, sizeof(priv_key));
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memzero(res_key, sizeof(res_key));
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return 1;
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}
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int hdnode_from_secret_cardano(const uint8_t secret[CARDANO_SECRET_LENGTH],
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HDNode *out) {
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memzero(out, sizeof(HDNode));
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out->depth = 0;
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out->child_num = 0;
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out->curve = &ed25519_cardano_info;
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memcpy(out->private_key, secret, 32);
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memcpy(out->private_key_extension, secret + 32, 32);
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memcpy(out->chain_code, secret + 64, 32);
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cardano_ed25519_tweak_bits(out->private_key);
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out->is_public_key_set = false;
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if (hdnode_fill_public_key(out) != 0) {
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return 0;
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}
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return 1;
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}
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// Derives the root Cardano secret from a master secret, aka seed, as defined in
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// SLIP-0023.
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int secret_from_seed_cardano_slip23(const uint8_t *seed, int seed_len,
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uint8_t secret_out[CARDANO_SECRET_LENGTH]) {
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static CONFIDENTIAL uint8_t I[SHA512_DIGEST_LENGTH];
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static CONFIDENTIAL HMAC_SHA512_CTX ctx;
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hmac_sha512_Init(&ctx, (const uint8_t *)ED25519_CARDANO_NAME,
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strlen(ED25519_CARDANO_NAME));
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hmac_sha512_Update(&ctx, seed, seed_len);
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hmac_sha512_Final(&ctx, I);
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sha512_Raw(I, 32, secret_out);
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memcpy(secret_out + SHA512_DIGEST_LENGTH, I + 32, 32);
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cardano_ed25519_tweak_bits(secret_out);
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memzero(I, sizeof(I));
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memzero(&ctx, sizeof(ctx));
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return 1;
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}
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// Derives the root Cardano secret from a BIP-32 master secret via the Ledger
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// derivation:
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// https://github.com/cardano-foundation/CIPs/blob/09d7d8ee1bd64f7e6b20b5a6cae088039dce00cb/CIP-0003/Ledger.md
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int secret_from_seed_cardano_ledger(const uint8_t *seed, int seed_len,
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uint8_t secret_out[CARDANO_SECRET_LENGTH]) {
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static CONFIDENTIAL uint8_t chain_code[SHA256_DIGEST_LENGTH];
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static CONFIDENTIAL uint8_t root_key[SHA512_DIGEST_LENGTH];
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static CONFIDENTIAL HMAC_SHA256_CTX ctx;
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static CONFIDENTIAL HMAC_SHA512_CTX sctx;
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const uint8_t *intermediate_result = seed;
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int intermediate_result_len = seed_len;
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do {
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// STEP 1: derive a master secret like in BIP-32/SLIP-10
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hmac_sha512_Init(&sctx, (const uint8_t *)ED25519_SEED_NAME,
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strlen(ED25519_SEED_NAME));
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hmac_sha512_Update(&sctx, intermediate_result, intermediate_result_len);
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hmac_sha512_Final(&sctx, root_key);
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// STEP 2: check that the resulting key does not have a particular bit set,
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// otherwise iterate like in SLIP-10
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intermediate_result = root_key;
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intermediate_result_len = sizeof(root_key);
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} while (root_key[31] & 0x20);
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// STEP 3: calculate the chain code as a HMAC-SHA256 of "\x01" + seed,
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// key is "ed25519 seed"
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hmac_sha256_Init(&ctx, (const unsigned char *)ED25519_SEED_NAME,
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strlen(ED25519_SEED_NAME));
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hmac_sha256_Update(&ctx, (const unsigned char *)"\x01", 1);
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hmac_sha256_Update(&ctx, seed, seed_len);
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hmac_sha256_Final(&ctx, chain_code);
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// STEP 4: extract information into output
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_Static_assert(
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SHA512_DIGEST_LENGTH + SHA256_DIGEST_LENGTH == CARDANO_SECRET_LENGTH,
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"Invalid configuration of Cardano secret size");
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memcpy(secret_out, root_key, SHA512_DIGEST_LENGTH);
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memcpy(secret_out + SHA512_DIGEST_LENGTH, chain_code, SHA256_DIGEST_LENGTH);
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// STEP 5: tweak bits of the private key
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cardano_ed25519_tweak_bits(secret_out);
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memzero(&ctx, sizeof(ctx));
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memzero(&sctx, sizeof(sctx));
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memzero(root_key, sizeof(root_key));
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memzero(chain_code, sizeof(chain_code));
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return 1;
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}
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#define CARDANO_ICARUS_STEPS 32
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_Static_assert(
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CARDANO_ICARUS_PBKDF2_ROUNDS % CARDANO_ICARUS_STEPS == 0,
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"CARDANO_ICARUS_STEPS does not divide CARDANO_ICARUS_PBKDF2_ROUNDS");
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#define CARDANO_ICARUS_ROUNDS_PER_STEP \
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(CARDANO_ICARUS_PBKDF2_ROUNDS / CARDANO_ICARUS_STEPS)
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// Derives the root Cardano HDNode from a passphrase and the entropy encoded in
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// a BIP-0039 mnemonic using the Icarus derivation scheme, aka V2 derivation
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// scheme:
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// https://github.com/cardano-foundation/CIPs/blob/09d7d8ee1bd64f7e6b20b5a6cae088039dce00cb/CIP-0003/Icarus.md
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int secret_from_entropy_cardano_icarus(
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const uint8_t *pass, int pass_len, const uint8_t *entropy, int entropy_len,
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uint8_t secret_out[CARDANO_SECRET_LENGTH],
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void (*progress_callback)(uint32_t, uint32_t)) {
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static CONFIDENTIAL PBKDF2_HMAC_SHA512_CTX pctx;
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static CONFIDENTIAL uint8_t digest[SHA512_DIGEST_LENGTH];
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uint32_t progress = 0;
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// PASS 1: first 64 bytes
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pbkdf2_hmac_sha512_Init(&pctx, pass, pass_len, entropy, entropy_len, 1);
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if (progress_callback) {
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progress_callback(progress, CARDANO_ICARUS_PBKDF2_ROUNDS * 2);
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}
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for (int i = 0; i < CARDANO_ICARUS_STEPS; i++) {
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pbkdf2_hmac_sha512_Update(&pctx, CARDANO_ICARUS_ROUNDS_PER_STEP);
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if (progress_callback) {
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progress += CARDANO_ICARUS_ROUNDS_PER_STEP;
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progress_callback(progress, CARDANO_ICARUS_PBKDF2_ROUNDS * 2);
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}
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}
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pbkdf2_hmac_sha512_Final(&pctx, digest);
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memcpy(secret_out, digest, SHA512_DIGEST_LENGTH);
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// PASS 2: remaining 32 bytes
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pbkdf2_hmac_sha512_Init(&pctx, pass, pass_len, entropy, entropy_len, 2);
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if (progress_callback) {
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progress_callback(progress, CARDANO_ICARUS_PBKDF2_ROUNDS * 2);
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}
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for (int i = 0; i < CARDANO_ICARUS_STEPS; i++) {
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pbkdf2_hmac_sha512_Update(&pctx, CARDANO_ICARUS_ROUNDS_PER_STEP);
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if (progress_callback) {
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progress += CARDANO_ICARUS_ROUNDS_PER_STEP;
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progress_callback(progress, CARDANO_ICARUS_PBKDF2_ROUNDS * 2);
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}
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}
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pbkdf2_hmac_sha512_Final(&pctx, digest);
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memcpy(secret_out + SHA512_DIGEST_LENGTH, digest,
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CARDANO_SECRET_LENGTH - SHA512_DIGEST_LENGTH);
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cardano_ed25519_tweak_bits(secret_out);
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memzero(&pctx, sizeof(pctx));
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memzero(digest, sizeof(digest));
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return 1;
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}
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#endif // USE_CARDANO
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