mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-27 01:48:17 +00:00
178 lines
7.5 KiB
C
178 lines
7.5 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 "trezor-crypto/ecdsa.h"
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#include "trezor-crypto/nist256p1.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_nist256p1_generate_secret() {
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vstr_t vstr;
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vstr_init_len(&vstr, 32);
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for (;;) {
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random_buffer((uint8_t *)vstr.buf, 32);
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// check whether secret > 0 && secret < curve_order
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if (0 == memcmp(vstr.buf, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32)) continue;
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if (0 <= memcmp(vstr.buf, "\xFF\xFF\xFF\xFF\x00\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xBC\xE6\xFA\xAD\xA7\x17\x9E\x84\xF3\xB9\xCA\xC2\xFC\x63\x25\x51", 32)) continue;
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break;
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(mod_trezorcrypto_nist256p1_generate_secret_obj, mod_trezorcrypto_nist256p1_generate_secret);
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/// def publickey(secret_key: bytes, compressed: bool = True) -> 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_nist256p1_publickey(size_t n_args, const mp_obj_t *args) {
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mp_buffer_info_t sk;
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mp_get_buffer_raise(args[0], &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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bool compressed = n_args < 2 || args[1] == mp_const_true;
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vstr_t vstr;
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if (compressed) {
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vstr_init_len(&vstr, 33);
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ecdsa_get_public_key33(&nist256p1, (const uint8_t *)sk.buf, (uint8_t *)vstr.buf);
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} else {
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vstr_init_len(&vstr, 65);
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ecdsa_get_public_key65(&nist256p1, (const uint8_t *)sk.buf, (uint8_t *)vstr.buf);
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorcrypto_nist256p1_publickey_obj, 1, 2, mod_trezorcrypto_nist256p1_publickey);
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/// def sign(secret_key: bytes, digest: bytes, compressed: bool = True) -> bytes:
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/// '''
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/// Uses secret key to produce the signature of the digest.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_nist256p1_sign(size_t n_args, const mp_obj_t *args) {
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mp_buffer_info_t sk, dig;
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mp_get_buffer_raise(args[0], &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(args[1], &dig, MP_BUFFER_READ);
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bool compressed = n_args < 3 || args[2] == mp_const_true;
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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 (dig.len != 32) {
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mp_raise_ValueError("Invalid length of digest");
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}
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vstr_t vstr;
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vstr_init_len(&vstr, 65);
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uint8_t pby;
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if (0 != ecdsa_sign_digest(&nist256p1, (const uint8_t *)sk.buf, (const uint8_t *)dig.buf, (uint8_t *)vstr.buf + 1, &pby, NULL)) {
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mp_raise_ValueError("Signing failed");
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}
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vstr.buf[0] = 27 + pby + compressed * 4;
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorcrypto_nist256p1_sign_obj, 2, 3, mod_trezorcrypto_nist256p1_sign);
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/// def verify(public_key: bytes, signature: bytes, digest: bytes) -> bool:
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/// '''
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/// Uses public key to verify the signature of the digest.
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/// Returns True on success.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_nist256p1_verify(mp_obj_t public_key, mp_obj_t signature, mp_obj_t digest) {
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mp_buffer_info_t pk, sig, dig;
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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(digest, &dig, MP_BUFFER_READ);
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if (pk.len != 33 && pk.len != 65) {
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mp_raise_ValueError("Invalid length of public key");
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}
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if (sig.len != 64 && sig.len != 65) {
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mp_raise_ValueError("Invalid length of signature");
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}
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int offset = sig.len - 64;
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if (dig.len != 32) {
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mp_raise_ValueError("Invalid length of digest");
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}
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return mp_obj_new_bool(0 == ecdsa_verify_digest(&nist256p1, (const uint8_t *)pk.buf, (const uint8_t *)sig.buf + offset, (const uint8_t *)dig.buf));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorcrypto_nist256p1_verify_obj, mod_trezorcrypto_nist256p1_verify);
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/// def verify_recover(signature: bytes, digest: bytes) -> bytes:
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/// '''
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/// Uses signature of the digest to verify the digest and recover the public key.
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/// Returns public key on success, None on failure.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_nist256p1_verify_recover(mp_obj_t signature, mp_obj_t digest) {
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mp_buffer_info_t sig, dig;
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mp_get_buffer_raise(signature, &sig, MP_BUFFER_READ);
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mp_get_buffer_raise(digest, &dig, MP_BUFFER_READ);
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if (sig.len != 65) {
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mp_raise_ValueError("Invalid length of signature");
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}
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if (dig.len != 32) {
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mp_raise_ValueError("Invalid length of digest");
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}
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uint8_t recid = ((const uint8_t *)sig.buf)[0] - 27;
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if (recid >= 8) {
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mp_raise_ValueError("Invalid recid in signature");
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}
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bool compressed = (recid >= 4);
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recid &= 3;
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vstr_t vstr;
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vstr_init_len(&vstr, 65);
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if (0 == ecdsa_verify_digest_recover(&nist256p1, (uint8_t *)vstr.buf, (const uint8_t *)sig.buf + 1, (const uint8_t *)dig.buf, recid)) {
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if (compressed) {
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vstr.buf[0] = 0x02 | (vstr.buf[64] & 1);
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vstr.len = 33;
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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} else {
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return mp_const_none;
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_nist256p1_verify_recover_obj, mod_trezorcrypto_nist256p1_verify_recover);
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/// def multiply(secret_key: bytes, public_key: bytes) -> bytes:
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/// '''
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/// Multiplies point defined by public_key with scalar defined by secret_key.
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/// Useful for ECDH.
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/// '''
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STATIC mp_obj_t mod_trezorcrypto_nist256p1_multiply(mp_obj_t secret_key, mp_obj_t public_key) {
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mp_buffer_info_t sk, pk;
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mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
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mp_get_buffer_raise(public_key, &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 (pk.len != 33 && pk.len != 65) {
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mp_raise_ValueError("Invalid length of public key");
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}
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vstr_t vstr;
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vstr_init_len(&vstr, 65);
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if (0 != ecdh_multiply(&nist256p1, (const uint8_t *)sk.buf, (const uint8_t *)pk.buf, (uint8_t *)vstr.buf)) {
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mp_raise_ValueError("Multiply failed");
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_nist256p1_multiply_obj, mod_trezorcrypto_nist256p1_multiply);
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STATIC const mp_rom_map_elem_t mod_trezorcrypto_nist256p1_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_nist256p1) },
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{ MP_ROM_QSTR(MP_QSTR_generate_secret), MP_ROM_PTR(&mod_trezorcrypto_nist256p1_generate_secret_obj) },
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{ MP_ROM_QSTR(MP_QSTR_publickey), MP_ROM_PTR(&mod_trezorcrypto_nist256p1_publickey_obj) },
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{ MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_trezorcrypto_nist256p1_sign_obj) },
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{ MP_ROM_QSTR(MP_QSTR_verify), MP_ROM_PTR(&mod_trezorcrypto_nist256p1_verify_obj) },
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{ MP_ROM_QSTR(MP_QSTR_verify_recover), MP_ROM_PTR(&mod_trezorcrypto_nist256p1_verify_recover_obj) },
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{ MP_ROM_QSTR(MP_QSTR_multiply), MP_ROM_PTR(&mod_trezorcrypto_nist256p1_multiply_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_trezorcrypto_nist256p1_globals, mod_trezorcrypto_nist256p1_globals_table);
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STATIC const mp_obj_module_t mod_trezorcrypto_nist256p1_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mod_trezorcrypto_nist256p1_globals,
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};
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