mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-18 13:38:12 +00:00
102 lines
4.3 KiB
C
102 lines
4.3 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/secp256k1.h"
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typedef struct _mp_obj_Secp256k1_t {
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mp_obj_base_t base;
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} mp_obj_Secp256k1_t;
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STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_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_Secp256k1_t *o = m_new_obj(mp_obj_Secp256k1_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.secp256k1.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_Secp256k1_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[1], &sk, MP_BUFFER_READ);
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if (sk.len != 32) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Invalid length of secret key"));
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}
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bool compressed = n_args < 3 || args[2] == 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(&secp256k1, (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(&secp256k1, (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_Secp256k1_publickey_obj, 2, 3, mod_TrezorCrypto_Secp256k1_publickey);
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/// def trezor.crypto.curve.secp256k1.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_Secp256k1_sign(mp_obj_t self, 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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nlr_raise(mp_obj_new_exception_msg(&mp_type_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, 65);
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uint8_t pby;
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if (0 != ecdsa_sign(&secp256k1, (const uint8_t *)sk.buf, (const uint8_t *)msg.buf, msg.len, (uint8_t *)vstr.buf, &pby)) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Signing failed"));
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}
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(void)pby;
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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_Secp256k1_sign_obj, mod_TrezorCrypto_Secp256k1_sign);
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/// def trezor.crypto.curve.secp256k1.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_Secp256k1_verify(size_t n_args, const mp_obj_t *args) {
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mp_buffer_info_t pk, sig, msg;
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mp_get_buffer_raise(args[1], &pk, MP_BUFFER_READ);
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mp_get_buffer_raise(args[2], &sig, MP_BUFFER_READ);
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mp_get_buffer_raise(args[3], &msg, MP_BUFFER_READ);
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if (pk.len != 33 && pk.len != 65) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Invalid length of public key"));
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}
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if (sig.len != 65) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Invalid length of signature"));
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}
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return mp_obj_new_bool(0 == ecdsa_verify(&secp256k1, (const uint8_t *)pk.buf, (const uint8_t *)sig.buf, (const uint8_t *)msg.buf, msg.len));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Secp256k1_verify_obj, 4, 4, mod_TrezorCrypto_Secp256k1_verify);
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STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Secp256k1_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_publickey), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_publickey_obj) },
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{ MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_sign_obj) },
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{ MP_ROM_QSTR(MP_QSTR_verify), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_verify_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Secp256k1_locals_dict, mod_TrezorCrypto_Secp256k1_locals_dict_table);
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STATIC const mp_obj_type_t mod_TrezorCrypto_Secp256k1_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Secp256k1,
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.make_new = mod_TrezorCrypto_Secp256k1_make_new,
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.locals_dict = (void*)&mod_TrezorCrypto_Secp256k1_locals_dict,
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};
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