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118 lines
4.6 KiB
118 lines
4.6 KiB
/*
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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_Ed25519_t {
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mp_obj_base_t base;
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} mp_obj_Ed25519_t;
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STATIC mp_obj_t mod_TrezorCrypto_Ed25519_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_Ed25519_t *o = m_new_obj(mp_obj_Ed25519_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.ed25519.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(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_Ed25519_generate_secret_obj, mod_TrezorCrypto_Ed25519_generate_secret);
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/// def trezor.crypto.curve.ed25519.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 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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ed25519_publickey(*(const ed25519_secret_key *)sk.buf, *(ed25519_public_key *)vstr.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_Ed25519_publickey_obj, mod_TrezorCrypto_Ed25519_publickey);
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/// def trezor.crypto.curve.ed25519.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 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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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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vstr_t vstr;
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vstr_init_len(&vstr, 64);
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ed25519_sign(msg.buf, msg.len, *(const ed25519_secret_key *)sk.buf, pk, *(ed25519_signature *)vstr.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_Ed25519_sign_obj, mod_TrezorCrypto_Ed25519_sign);
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/// def trezor.crypto.curve.ed25519.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(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 != 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_VAR_BETWEEN(mod_TrezorCrypto_Ed25519_verify_obj, 4, 4, mod_TrezorCrypto_Ed25519_verify);
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STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Ed25519_locals_dict_table[] = {
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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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};
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STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Ed25519_locals_dict, mod_TrezorCrypto_Ed25519_locals_dict_table);
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STATIC const mp_obj_type_t mod_TrezorCrypto_Ed25519_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Ed25519,
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.make_new = mod_TrezorCrypto_Ed25519_make_new,
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.locals_dict = (void*)&mod_TrezorCrypto_Ed25519_locals_dict,
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};
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