mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-25 15:58:08 +00:00
93 lines
3.6 KiB
C
93 lines
3.6 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/ed25519-donna/ed25519.h"
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#include "rand.h"
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typedef struct _mp_obj_Curve25519_t {
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mp_obj_base_t base;
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} mp_obj_Curve25519_t;
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STATIC mp_obj_t mod_TrezorCrypto_Curve25519_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, 0, false);
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mp_obj_Curve25519_t *o = m_new_obj(mp_obj_Curve25519_t);
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o->base.type = type;
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return MP_OBJ_FROM_PTR(o);
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}
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/// def trezor.crypto.curve.curve25519.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_Curve25519_generate_secret(mp_obj_t self) {
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vstr_t vstr;
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vstr_init_len(&vstr, 32);
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random_buffer((uint8_t *)vstr.buf, 32);
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// taken from https://cr.yp.to/ecdh.html
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vstr.buf[0] &= 248;
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vstr.buf[31] &= 127;
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vstr.buf[31] |= 64;
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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_1(mod_TrezorCrypto_Curve25519_generate_secret_obj, mod_TrezorCrypto_Curve25519_generate_secret);
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/// def trezor.crypto.curve.curve25519.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_Curve25519_publickey(mp_obj_t self, 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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vstr_t vstr;
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vstr_init_len(&vstr, 32);
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curve25519_scalarmult_basepoint((uint8_t *)vstr.buf, (const uint8_t *)sk.buf);
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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_Curve25519_publickey_obj, mod_TrezorCrypto_Curve25519_publickey);
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/// def trezor.crypto.curve.curve25519.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_Curve25519_multiply(mp_obj_t self, 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 != 32) {
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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, 32);
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curve25519_scalarmult((uint8_t *)vstr.buf, (const uint8_t *)sk.buf, (const uint8_t *)pk.buf);
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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_3(mod_TrezorCrypto_Curve25519_multiply_obj, mod_TrezorCrypto_Curve25519_multiply);
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STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Curve25519_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_generate_secret), MP_ROM_PTR(&mod_TrezorCrypto_Curve25519_generate_secret_obj) },
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{ MP_ROM_QSTR(MP_QSTR_publickey), MP_ROM_PTR(&mod_TrezorCrypto_Curve25519_publickey_obj) },
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{ MP_ROM_QSTR(MP_QSTR_multiply), MP_ROM_PTR(&mod_TrezorCrypto_Curve25519_multiply_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Curve25519_locals_dict, mod_TrezorCrypto_Curve25519_locals_dict_table);
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STATIC const mp_obj_type_t mod_TrezorCrypto_Curve25519_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Curve25519,
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.make_new = mod_TrezorCrypto_Curve25519_make_new,
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.locals_dict = (void*)&mod_TrezorCrypto_Curve25519_locals_dict,
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};
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