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128 lines
4.5 KiB
128 lines
4.5 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/pbkdf2.h"
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typedef struct _mp_obj_Pbkdf2_t {
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mp_obj_base_t base;
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union {
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PBKDF2_HMAC_SHA256_CTX ctx256;
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PBKDF2_HMAC_SHA512_CTX ctx512;
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};
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int prf;
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} mp_obj_Pbkdf2_t;
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STATIC mp_obj_t mod_TrezorCrypto_Pbkdf2_update(mp_obj_t self, mp_obj_t data);
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/// def trezor.crypto.pbkdf2(prf: str, password: bytes, salt: bytes, iterations: int=None) -> Pbkdf2:
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/// '''
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/// Create a PBKDF2 context
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/// '''
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STATIC mp_obj_t mod_TrezorCrypto_Pbkdf2_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, 3, 4, false);
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mp_obj_Pbkdf2_t *o = m_new_obj(mp_obj_Pbkdf2_t);
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o->base.type = type;
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mp_buffer_info_t prf;
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mp_get_buffer_raise(args[0], &prf, MP_BUFFER_READ);
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mp_buffer_info_t password;
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mp_get_buffer_raise(args[1], &password, MP_BUFFER_READ);
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mp_buffer_info_t salt;
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mp_get_buffer_raise(args[2], &salt, MP_BUFFER_READ);
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if (password.len == 0) {
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password.buf = "";
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}
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if (salt.len == 0) {
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salt.buf = "";
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}
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o->prf = 0;
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if (prf.len == 11 && memcmp(prf.buf, "hmac-sha256", prf.len) == 0) {
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pbkdf2_hmac_sha256_Init(&(o->ctx256), password.buf, password.len, salt.buf, salt.len);
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o->prf = 256;
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} else
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if (prf.len == 11 && memcmp(prf.buf, "hmac-sha512", prf.len) == 0) {
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pbkdf2_hmac_sha512_Init(&(o->ctx512), password.buf, password.len, salt.buf, salt.len);
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o->prf = 512;
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} else
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if (o->prf == 0) {
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mp_raise_ValueError("Invalid PRF");
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}
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// constructor called with iterations as fourth parameter
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if (n_args > 3) {
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mod_TrezorCrypto_Pbkdf2_update(MP_OBJ_FROM_PTR(o), args[3]);
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}
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return MP_OBJ_FROM_PTR(o);
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}
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/// def trezor.crypto.pbkdf2.update(self, iterations: int) -> None:
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/// '''
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/// Update a PBKDF2 context
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/// '''
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STATIC mp_obj_t mod_TrezorCrypto_Pbkdf2_update(mp_obj_t self, mp_obj_t iterations) {
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mp_obj_Pbkdf2_t *o = MP_OBJ_TO_PTR(self);
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uint32_t iter = mp_obj_get_int(iterations);
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if (o->prf == 256) {
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pbkdf2_hmac_sha256_Update(&(o->ctx256), iter);
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}
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if (o->prf == 512) {
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pbkdf2_hmac_sha512_Update(&(o->ctx512), iter);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_Pbkdf2_update_obj, mod_TrezorCrypto_Pbkdf2_update);
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/// def trezor.crypto.pbkdf2.key(self) -> bytes:
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/// '''
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/// Retreive derived key
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/// '''
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STATIC mp_obj_t mod_TrezorCrypto_Pbkdf2_key(mp_obj_t self) {
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mp_obj_Pbkdf2_t *o = MP_OBJ_TO_PTR(self);
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vstr_t vstr;
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if (o->prf == 256) {
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PBKDF2_HMAC_SHA256_CTX ctx;
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memcpy(&ctx, &(o->ctx256), sizeof(PBKDF2_HMAC_SHA256_CTX));
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vstr_init_len(&vstr, SHA256_DIGEST_LENGTH);
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pbkdf2_hmac_sha256_Final(&ctx, (uint8_t *)vstr.buf);
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memset(&ctx, 0, sizeof(PBKDF2_HMAC_SHA256_CTX));
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}
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if (o->prf == 512) {
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PBKDF2_HMAC_SHA512_CTX ctx;
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memcpy(&ctx, &(o->ctx512), sizeof(PBKDF2_HMAC_SHA512_CTX));
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vstr_init_len(&vstr, SHA512_DIGEST_LENGTH);
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pbkdf2_hmac_sha512_Final(&ctx, (uint8_t *)vstr.buf);
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memset(&ctx, 0, sizeof(PBKDF2_HMAC_SHA512_CTX));
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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_1(mod_TrezorCrypto_Pbkdf2_key_obj, mod_TrezorCrypto_Pbkdf2_key);
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STATIC mp_obj_t mod_TrezorCrypto_Pbkdf2___del__(mp_obj_t self) {
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mp_obj_Pbkdf2_t *o = MP_OBJ_TO_PTR(self);
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memset(&(o->ctx256), 0, sizeof(PBKDF2_HMAC_SHA256_CTX));
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memset(&(o->ctx512), 0, sizeof(PBKDF2_HMAC_SHA512_CTX));
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_TrezorCrypto_Pbkdf2___del___obj, mod_TrezorCrypto_Pbkdf2___del__);
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STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Pbkdf2_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_update), MP_ROM_PTR(&mod_TrezorCrypto_Pbkdf2_update_obj) },
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{ MP_ROM_QSTR(MP_QSTR_key), MP_ROM_PTR(&mod_TrezorCrypto_Pbkdf2_key_obj) },
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{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mod_TrezorCrypto_Pbkdf2___del___obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Pbkdf2_locals_dict, mod_TrezorCrypto_Pbkdf2_locals_dict_table);
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STATIC const mp_obj_type_t mod_TrezorCrypto_Pbkdf2_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Pbkdf2,
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.make_new = mod_TrezorCrypto_Pbkdf2_make_new,
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.locals_dict = (void*)&mod_TrezorCrypto_Pbkdf2_locals_dict,
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};
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