mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-23 14:58:09 +00:00
194 lines
8.0 KiB
C
194 lines
8.0 KiB
C
/*
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* Copyright (c) Pavol Rusnak, SatoshiLabs
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*
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* Licensed under TREZOR License
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* see LICENSE file for details
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*/
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#include "py/objstr.h"
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#include "ed25519-donna/ed25519.h"
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#include "rand.h"
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/// def generate_secret() -> bytes:
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/// '''
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/// Generate secret key.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_generate_secret() {
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uint8_t out[32];
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random_buffer(out, 32);
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// taken from https://cr.yp.to/ecdh.html
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out[0] &= 248;
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out[31] &= 127;
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out[31] |= 64;
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(mod_trezorcrypto_ed25519_generate_secret_obj, mod_trezorcrypto_ed25519_generate_secret);
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/// def publickey(secret_key: bytes) -> bytes:
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/// '''
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/// Computes public key from secret key.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_publickey(mp_obj_t secret_key) {
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mp_buffer_info_t sk;
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mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
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if (sk.len != 32) {
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mp_raise_ValueError("Invalid length of secret key");
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}
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uint8_t out[32];
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ed25519_publickey(*(const ed25519_secret_key *)sk.buf, *(ed25519_public_key *)out);
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_ed25519_publickey_obj, mod_trezorcrypto_ed25519_publickey);
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/// def sign(secret_key: bytes, message: bytes) -> bytes:
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/// '''
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/// Uses secret key to produce the signature of message.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_sign(mp_obj_t secret_key, mp_obj_t message) {
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mp_buffer_info_t sk, msg;
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mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(message, &msg, MP_BUFFER_READ);
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if (sk.len != 32) {
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mp_raise_ValueError("Invalid length of secret key");
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}
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if (msg.len == 0) {
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mp_raise_ValueError("Empty data to sign");
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}
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ed25519_public_key pk;
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ed25519_publickey(*(const ed25519_secret_key *)sk.buf, pk);
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uint8_t out[64];
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ed25519_sign(msg.buf, msg.len, *(const ed25519_secret_key *)sk.buf, pk, *(ed25519_signature *)out);
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_ed25519_sign_obj, mod_trezorcrypto_ed25519_sign);
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/// def verify(public_key: bytes, signature: bytes, message: bytes) -> bool:
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/// '''
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/// Uses public key to verify the signature of the message.
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/// Returns True on success.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_verify(mp_obj_t public_key, mp_obj_t signature, mp_obj_t message) {
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mp_buffer_info_t pk, sig, msg;
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mp_get_buffer_raise(public_key, &pk, MP_BUFFER_READ);
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mp_get_buffer_raise(signature, &sig, MP_BUFFER_READ);
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mp_get_buffer_raise(message, &msg, MP_BUFFER_READ);
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if (pk.len != 32) {
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mp_raise_ValueError("Invalid length of public key");
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}
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if (sig.len != 64) {
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mp_raise_ValueError("Invalid length of signature");
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}
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if (msg.len == 0) {
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mp_raise_ValueError("Empty data to verify");
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}
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return (0 == ed25519_sign_open(msg.buf, msg.len, *(const ed25519_public_key *)pk.buf, *(const ed25519_signature *)sig.buf)) ? mp_const_true : mp_const_false;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorcrypto_ed25519_verify_obj, mod_trezorcrypto_ed25519_verify);
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/// def cosi_combine_publickeys(public_keys: List[bytes]) -> bytes:
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/// '''
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/// Combines a list of public keys used in COSI cosigning scheme.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_cosi_combine_publickeys(mp_obj_t public_keys) {
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size_t pklen;
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mp_obj_t *pkitems;
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mp_obj_get_array(public_keys, &pklen, &pkitems);
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if (pklen > 15) {
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mp_raise_ValueError("Can't combine more than 15 public keys");
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}
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mp_buffer_info_t buf;
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ed25519_public_key pks[pklen];
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for (int i = 0; i < pklen; i++) {
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mp_get_buffer_raise(pkitems[i], &buf, MP_BUFFER_READ);
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if (buf.len != 32) {
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mp_raise_ValueError("Invalid length of public key");
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}
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memcpy(pks[i], buf.buf, buf.len);
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}
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uint8_t out[32];
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if (0 != ed25519_cosi_combine_publickeys(*(ed25519_public_key *)out, pks, pklen)) {
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mp_raise_ValueError("Error combining public keys");
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}
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_ed25519_cosi_combine_publickeys_obj, mod_trezorcrypto_ed25519_cosi_combine_publickeys);
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/// def cosi_combine_signatures(R: bytes, signatures: List[bytes]) -> bytes:
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/// '''
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/// Combines a list of signatures used in COSI cosigning scheme.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_cosi_combine_signatures(mp_obj_t R, mp_obj_t signatures) {
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mp_buffer_info_t sigR;
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mp_get_buffer_raise(R, &sigR, MP_BUFFER_READ);
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if (sigR.len != 32) {
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mp_raise_ValueError("Invalid length of R");
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}
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size_t siglen;
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mp_obj_t *sigitems;
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mp_obj_get_array(signatures, &siglen, &sigitems);
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if (siglen > 15) {
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mp_raise_ValueError("Can't combine more than 15 COSI signatures");
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}
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mp_buffer_info_t buf;
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ed25519_cosi_signature sigs[siglen];
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for (int i = 0; i < siglen; i++) {
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mp_get_buffer_raise(sigitems[i], &buf, MP_BUFFER_READ);
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if (buf.len != 32) {
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mp_raise_ValueError("Invalid length of COSI signature");
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}
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memcpy(sigs[i], buf.buf, buf.len);
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}
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uint8_t out[64];
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ed25519_cosi_combine_signatures(*(ed25519_signature *)out, *(const ed25519_public_key *)sigR.buf, sigs, siglen);
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_ed25519_cosi_combine_signatures_obj, mod_trezorcrypto_ed25519_cosi_combine_signatures);
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/// def cosi_sign(secret_key: bytes, message: bytes, nonce: bytes, sigR: bytes, combined_pubkey: bytes) -> bytes:
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/// '''
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/// Produce signature of message using COSI cosigning scheme.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_ed25519_cosi_sign(size_t n_args, const mp_obj_t *args) {
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mp_buffer_info_t sk, msg, nonce, sigR, pk;
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mp_get_buffer_raise(args[0], &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(args[1], &msg, MP_BUFFER_READ);
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mp_get_buffer_raise(args[2], &nonce, MP_BUFFER_READ);
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mp_get_buffer_raise(args[3], &sigR, MP_BUFFER_READ);
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mp_get_buffer_raise(args[4], &pk, MP_BUFFER_READ);
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if (sk.len != 32) {
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mp_raise_ValueError("Invalid length of secret key");
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}
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if (nonce.len != 32) {
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mp_raise_ValueError("Invalid length of nonce");
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}
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if (sigR.len != 32) {
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mp_raise_ValueError("Invalid length of R");
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}
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if (pk.len != 32) {
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mp_raise_ValueError("Invalid length of aggregated public key");
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}
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uint8_t out[32];
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ed25519_cosi_sign(msg.buf, msg.len, *(const ed25519_secret_key *)sk.buf, *(const ed25519_secret_key *)nonce.buf, *(const ed25519_public_key *)sigR.buf, *(const ed25519_secret_key *)pk.buf, *(ed25519_cosi_signature *)out);
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return mp_obj_new_bytes(out, sizeof(out));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorcrypto_ed25519_cosi_sign_obj, 5, 5, mod_trezorcrypto_ed25519_cosi_sign);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_ed25519_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ed25519) },
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{ MP_ROM_QSTR(MP_QSTR_generate_secret), MP_ROM_PTR(&mod_trezorcrypto_ed25519_generate_secret_obj) },
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{ MP_ROM_QSTR(MP_QSTR_publickey), MP_ROM_PTR(&mod_trezorcrypto_ed25519_publickey_obj) },
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{ MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_trezorcrypto_ed25519_sign_obj) },
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{ MP_ROM_QSTR(MP_QSTR_verify), MP_ROM_PTR(&mod_trezorcrypto_ed25519_verify_obj) },
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{ MP_ROM_QSTR(MP_QSTR_cosi_combine_publickeys), MP_ROM_PTR(&mod_trezorcrypto_ed25519_cosi_combine_publickeys_obj) },
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{ MP_ROM_QSTR(MP_QSTR_cosi_combine_signatures), MP_ROM_PTR(&mod_trezorcrypto_ed25519_cosi_combine_signatures_obj) },
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{ MP_ROM_QSTR(MP_QSTR_cosi_sign), MP_ROM_PTR(&mod_trezorcrypto_ed25519_cosi_sign_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_ed25519_globals, mod_trezorcrypto_ed25519_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_ed25519_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mod_trezorcrypto_ed25519_globals,
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};
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