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ledger-app-monero/src/monero_prehash.c

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/*****************************************************************************
* Ledger Monero App.
* (c) 2017-2020 Cedric Mesnil <cslashm@gmail.com>, Ledger SAS.
* (c) 2020 Ledger SAS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*****************************************************************************/
/*
* Client: rctSigs.cpp.c -> get_pre_mlsag_hash
*/
#include "os.h"
#include "cx.h"
#include "monero_types.h"
#include "monero_api.h"
#include "monero_vars.h"
/* ----------------------------------------------------------------------- */
/* --- --- */
/* ----------------------------------------------------------------------- */
int monero_apdu_mlsag_prehash_init() {
int error = 0;
if (G_monero_vstate.tx_sig_mode == TRANSACTION_CREATE_REAL) {
if (G_monero_vstate.io_p2 == 1) {
error = monero_sha256_outkeys_final(G_monero_vstate.OUTK);
if (error) {
return error;
}
monero_sha256_outkeys_init();
monero_sha256_commitment_init();
error = monero_keccak_init_H();
if (error) {
return error;
}
}
}
error = monero_keccak_update_H(G_monero_vstate.io_buffer + G_monero_vstate.io_offset,
G_monero_vstate.io_length - G_monero_vstate.io_offset);
if (error) {
return error;
}
if ((G_monero_vstate.tx_sig_mode == TRANSACTION_CREATE_REAL) && (G_monero_vstate.io_p2 == 1)) {
// skip type
monero_io_fetch_u8();
// fee str
monero_vamount2str(G_monero_vstate.io_buffer + G_monero_vstate.io_offset,
G_monero_vstate.ux_amount, 15);
// ask user
monero_io_discard(1);
ui_menu_fee_validation_display(0);
return 0;
} else {
monero_io_discard(1);
return SW_OK;
}
}
/* ----------------------------------------------------------------------- */
/* --- --- */
/* ----------------------------------------------------------------------- */
int monero_apdu_mlsag_prehash_update() {
unsigned char is_subaddress;
unsigned char *Aout;
unsigned char *Bout;
unsigned char is_change;
unsigned char AKout[KEY_SIZE];
unsigned char C[32];
unsigned char v[32];
unsigned char k[32];
#define aH AKout
unsigned char kG[32];
int err = 0;
// fetch destination
is_subaddress = monero_io_fetch_u8();
if (G_monero_vstate.io_protocol_version >= 2) {
is_change = monero_io_fetch_u8();
} else {
is_change = 0;
}
Aout = G_monero_vstate.io_buffer + G_monero_vstate.io_offset;
monero_io_skip(32);
Bout = G_monero_vstate.io_buffer + G_monero_vstate.io_offset;
monero_io_skip(32);
err = monero_io_fetch_decrypt(AKout, KEY_SIZE, TYPE_AMOUNT_KEY);
if (err) {
return err;
}
monero_io_fetch(C, 32);
monero_io_fetch(k, 32);
monero_io_fetch(v, 32);
monero_io_discard(0);
// update MLSAG prehash
if ((G_monero_vstate.options & 0x03) == 0x02) {
err = monero_keccak_update_H(v, 8);
if (err) {
return err;
}
} else {
err = monero_keccak_update_H(k, 32);
if (err) {
return err;
}
err = monero_keccak_update_H(v, 32);
if (err) {
return err;
}
}
if (G_monero_vstate.tx_sig_mode == TRANSACTION_CREATE_REAL) {
if (is_change == 0) {
// encode dest adress
err = monero_base58_public_key(&G_monero_vstate.ux_address[0], Aout, Bout,
is_subaddress, NULL);
if (err) {
return err;
}
}
// update destination hash control
if (G_monero_vstate.io_protocol_version >= 2) {
err = monero_sha256_outkeys_update(Aout, KEY_SIZE);
if (err) {
return err;
}
err = monero_sha256_outkeys_update(Bout, KEY_SIZE);
if (err) {
return err;
}
err = monero_sha256_outkeys_update(&is_change, 1);
if (err) {
return err;
}
err = monero_sha256_outkeys_update(AKout, KEY_SIZE);
if (err) {
return err;
}
}
// check C = aH+kG
err = monero_unblind(v, k, AKout, G_monero_vstate.options & 0x03, sizeof(v), sizeof(k),
sizeof(AKout));
if (err) {
return err;
}
err = monero_ecmul_G(kG, k, sizeof(kG), sizeof(k));
if (err) {
return err;
}
if (!cx_math_is_zero(v, 32)) {
err = monero_ecmul_H(aH, v, sizeof(aH), sizeof(v));
if (err) {
return err;
}
err = monero_ecadd(aH, kG, aH, sizeof(aH), sizeof(kG), sizeof(aH));
if (err) {
return err;
}
} else {
memcpy(aH, kG, 32);
}
if (memcmp(C, aH, 32) != 0) {
#ifndef BYPASS_COMMITMENT_FOR_TESTS
return SW_SECURITY_COMMITMENT_CHAIN_CONTROL;
#endif
}
// update commitment hash control
err = monero_sha256_commitment_update(C, 32);
if (err) {
return err;
}
if ((G_monero_vstate.options & IN_OPTION_MORE_COMMAND) == 0) {
if (G_monero_vstate.io_protocol_version >= 2) {
// finalize and check destination hash_control
err = monero_sha256_outkeys_final(k);
if (err) {
return err;
}
if (memcmp(k, G_monero_vstate.OUTK, KEY_SIZE) != 0) {
return SW_SECURITY_COMMITMENT_CHAIN_CONTROL;
}
}
// finalize commitment hash control
err = monero_sha256_commitment_final(NULL);
if (err) {
return err;
}
monero_sha256_commitment_init();
}
// ask user
uint64_t amount;
amount = monero_bamount2uint64(v, sizeof(v));
if (amount) {
monero_amount2str(amount, G_monero_vstate.ux_amount, 15);
if ((G_monero_vstate.options & IN_OPTION_MORE_COMMAND) == 0) {
if (!is_change) {
ui_menu_validation_display_last(0);
} else {
ui_menu_change_validation_display_last(0);
}
} else {
if (!is_change) {
ui_menu_validation_display(0);
} else {
ui_menu_change_validation_display(0);
}
}
return 0;
}
}
return SW_OK;
#undef aH
}
/* ----------------------------------------------------------------------- */
/* --- --- */
/* ----------------------------------------------------------------------- */
int monero_apdu_mlsag_prehash_finalize() {
unsigned char message[32];
unsigned char proof[32];
unsigned char H[32];
int error;
if (G_monero_vstate.options & IN_OPTION_MORE_COMMAND) {
// accumulate
monero_io_fetch(H, 32);
monero_io_discard(1);
error = monero_keccak_update_H(H, 32);
if (error) {
return error;
}
error = monero_sha256_commitment_update(H, 32);
if (error) {
return error;
}
} else {
// Finalize and check commitment hash control
if (G_monero_vstate.tx_sig_mode == TRANSACTION_CREATE_REAL) {
error = monero_sha256_commitment_final(H);
if (error) {
return error;
}
if (memcmp(H, G_monero_vstate.C, 32) != 0) {
#ifndef BYPASS_COMMITMENT_FOR_TESTS
return SW_SECURITY_COMMITMENT_CHAIN_CONTROL;
#endif
}
}
// compute last H
error = monero_keccak_final_H(H);
if (error) {
return error;
}
// compute last prehash
monero_io_fetch(message, 32);
monero_io_fetch(proof, 32);
monero_io_discard(1);
error = monero_keccak_init_H();
if (error) {
return error;
}
if (G_monero_vstate.io_protocol_version >= 3) {
if (memcmp(message, G_monero_vstate.prefixH, 32) != 0) {
#ifndef BYPASS_COMMITMENT_FOR_TESTS
return SW_SECURITY_PREFIX_HASH;
#endif
}
}
error = monero_keccak_update_H(message, 32);
if (error) {
return error;
}
error = monero_keccak_update_H(H, 32);
if (error) {
return error;
}
error = monero_keccak_update_H(proof, 32);
if (error) {
return error;
}
error = monero_keccak_final_H(G_monero_vstate.mlsagH);
if (error) {
return error;
}
monero_io_insert(G_monero_vstate.mlsagH, 32);
if (G_monero_vstate.tx_sig_mode == TRANSACTION_CREATE_REAL) {
ui_menu_transaction_signed();
}
}
return SW_OK;
}
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