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287 lines
7.9 KiB
287 lines
7.9 KiB
/**
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* Copyright (c) 2013-2014 Tomas Dzetkulic
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* Copyright (c) 2013-2014 Pavol Rusnak
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include <string.h>
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#include "bip39.h"
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#include "hmac.h"
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#include "memzero.h"
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#include "options.h"
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#include "pbkdf2.h"
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#include "rand.h"
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#include "sha2.h"
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#if USE_BIP39_CACHE
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static int bip39_cache_index = 0;
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static CONFIDENTIAL struct {
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bool set;
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char mnemonic[256];
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char passphrase[64];
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uint8_t seed[512 / 8];
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} bip39_cache[BIP39_CACHE_SIZE];
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void bip39_cache_clear(void) {
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memzero(bip39_cache, sizeof(bip39_cache));
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bip39_cache_index = 0;
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}
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#endif
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const char *mnemonic_generate(int strength) {
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if (strength % 32 || strength < 128 || strength > 256) {
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return 0;
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}
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uint8_t data[32] = {0};
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random_buffer(data, 32);
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const char *r = mnemonic_from_data(data, strength / 8);
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memzero(data, sizeof(data));
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return r;
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}
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static CONFIDENTIAL char mnemo[24 * 10];
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const char *mnemonic_from_data(const uint8_t *data, int len) {
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if (len % 4 || len < 16 || len > 32) {
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return 0;
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}
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uint8_t bits[32 + 1] = {0};
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sha256_Raw(data, len, bits);
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// checksum
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bits[len] = bits[0];
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// data
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memcpy(bits, data, len);
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int mlen = len * 3 / 4;
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int i = 0, j = 0, idx = 0;
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char *p = mnemo;
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for (i = 0; i < mlen; i++) {
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idx = 0;
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for (j = 0; j < 11; j++) {
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idx <<= 1;
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idx += (bits[(i * 11 + j) / 8] & (1 << (7 - ((i * 11 + j) % 8)))) > 0;
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}
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strcpy(p, BIP39_WORDLIST_ENGLISH[idx]);
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p += strlen(BIP39_WORDLIST_ENGLISH[idx]);
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*p = (i < mlen - 1) ? ' ' : 0;
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p++;
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}
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memzero(bits, sizeof(bits));
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return mnemo;
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}
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void mnemonic_clear(void) { memzero(mnemo, sizeof(mnemo)); }
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int mnemonic_to_bits(const char *mnemonic, uint8_t *bits) {
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if (!mnemonic) {
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return 0;
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}
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uint32_t i = 0, n = 0;
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while (mnemonic[i]) {
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if (mnemonic[i] == ' ') {
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n++;
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}
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i++;
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}
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n++;
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// check that number of words is valid for BIP-39:
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// (a) between 128 and 256 bits of initial entropy (12 - 24 words)
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// (b) number of bits divisible by 33 (1 checksum bit per 32 input bits)
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// - that is, (n * 11) % 33 == 0, so n % 3 == 0
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if (n < 12 || n > 24 || (n % 3)) {
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return 0;
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}
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char current_word[10] = {0};
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uint32_t j = 0, ki = 0, bi = 0;
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uint8_t result[32 + 1] = {0};
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memzero(result, sizeof(result));
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i = 0;
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while (mnemonic[i]) {
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j = 0;
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while (mnemonic[i] != ' ' && mnemonic[i] != 0) {
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if (j >= sizeof(current_word) - 1) {
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return 0;
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}
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current_word[j] = mnemonic[i];
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i++;
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j++;
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}
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current_word[j] = 0;
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if (mnemonic[i] != 0) {
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i++;
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}
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int k = mnemonic_find_word(current_word);
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if (k < 0) { // word not found
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return 0;
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}
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for (ki = 0; ki < 11; ki++) {
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if (k & (1 << (10 - ki))) {
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result[bi / 8] |= 1 << (7 - (bi % 8));
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}
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bi++;
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}
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}
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if (bi != n * 11) {
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return 0;
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}
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memcpy(bits, result, sizeof(result));
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memzero(result, sizeof(result));
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// returns amount of entropy + checksum BITS
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return n * 11;
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}
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int mnemonic_check(const char *mnemonic) {
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uint8_t bits[32 + 1] = {0};
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int mnemonic_bits_len = mnemonic_to_bits(mnemonic, bits);
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if (mnemonic_bits_len != (12 * 11) && mnemonic_bits_len != (18 * 11) &&
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mnemonic_bits_len != (24 * 11)) {
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return 0;
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}
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int words = mnemonic_bits_len / 11;
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uint8_t checksum = bits[words * 4 / 3];
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sha256_Raw(bits, words * 4 / 3, bits);
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if (words == 12) {
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return (bits[0] & 0xF0) == (checksum & 0xF0); // compare first 4 bits
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} else if (words == 18) {
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return (bits[0] & 0xFC) == (checksum & 0xFC); // compare first 6 bits
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} else if (words == 24) {
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return bits[0] == checksum; // compare 8 bits
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}
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return 0;
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}
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// passphrase must be at most 256 characters otherwise it would be truncated
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void mnemonic_to_seed(const char *mnemonic, const char *passphrase,
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uint8_t seed[512 / 8],
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void (*progress_callback)(uint32_t current,
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uint32_t total)) {
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int mnemoniclen = strlen(mnemonic);
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int passphraselen = strnlen(passphrase, 256);
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#if USE_BIP39_CACHE
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// check cache
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if (mnemoniclen < 256 && passphraselen < 64) {
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for (int i = 0; i < BIP39_CACHE_SIZE; i++) {
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if (!bip39_cache[i].set) continue;
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if (strcmp(bip39_cache[i].mnemonic, mnemonic) != 0) continue;
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if (strcmp(bip39_cache[i].passphrase, passphrase) != 0) continue;
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// found the correct entry
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memcpy(seed, bip39_cache[i].seed, 512 / 8);
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return;
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}
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}
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#endif
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uint8_t salt[8 + 256] = {0};
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memcpy(salt, "mnemonic", 8);
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memcpy(salt + 8, passphrase, passphraselen);
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static CONFIDENTIAL PBKDF2_HMAC_SHA512_CTX pctx;
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pbkdf2_hmac_sha512_Init(&pctx, (const uint8_t *)mnemonic, mnemoniclen, salt,
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passphraselen + 8, 1);
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if (progress_callback) {
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progress_callback(0, BIP39_PBKDF2_ROUNDS);
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}
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for (int i = 0; i < 16; i++) {
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pbkdf2_hmac_sha512_Update(&pctx, BIP39_PBKDF2_ROUNDS / 16);
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if (progress_callback) {
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progress_callback((i + 1) * BIP39_PBKDF2_ROUNDS / 16,
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BIP39_PBKDF2_ROUNDS);
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}
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}
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pbkdf2_hmac_sha512_Final(&pctx, seed);
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memzero(salt, sizeof(salt));
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#if USE_BIP39_CACHE
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// store to cache
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if (mnemoniclen < 256 && passphraselen < 64) {
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bip39_cache[bip39_cache_index].set = true;
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strcpy(bip39_cache[bip39_cache_index].mnemonic, mnemonic);
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strcpy(bip39_cache[bip39_cache_index].passphrase, passphrase);
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memcpy(bip39_cache[bip39_cache_index].seed, seed, 512 / 8);
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bip39_cache_index = (bip39_cache_index + 1) % BIP39_CACHE_SIZE;
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}
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#endif
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}
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// binary search for finding the word in the wordlist
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int mnemonic_find_word(const char *word) {
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int lo = 0, hi = BIP39_WORD_COUNT - 1;
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while (lo <= hi) {
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int mid = lo + (hi - lo) / 2;
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int cmp = strcmp(word, BIP39_WORDLIST_ENGLISH[mid]);
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if (cmp == 0) {
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return mid;
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}
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if (cmp > 0) {
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lo = mid + 1;
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} else {
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hi = mid - 1;
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}
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}
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return -1;
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}
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const char *mnemonic_complete_word(const char *prefix, int len) {
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// we need to perform linear search,
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// because we want to return the first match
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for (int i = 0; i < BIP39_WORD_COUNT; i++) {
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if (strncmp(BIP39_WORDLIST_ENGLISH[i], prefix, len) == 0) {
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return BIP39_WORDLIST_ENGLISH[i];
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}
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}
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return NULL;
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}
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const char *mnemonic_get_word(int index) {
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if (index >= 0 && index < BIP39_WORD_COUNT) {
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return BIP39_WORDLIST_ENGLISH[index];
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} else {
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return NULL;
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}
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}
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uint32_t mnemonic_word_completion_mask(const char *prefix, int len) {
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if (len <= 0) {
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return 0x3ffffff; // all letters (bits 1-26 set)
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}
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uint32_t res = 0;
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for (int i = 0; i < BIP39_WORD_COUNT; i++) {
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const char *word = BIP39_WORDLIST_ENGLISH[i];
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if (strncmp(word, prefix, len) == 0 && word[len] >= 'a' &&
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word[len] <= 'z') {
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res |= 1 << (word[len] - 'a');
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}
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}
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return res;
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}
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