commit 49579e775dc0a54aad6e939157a9e73f894671f9
parent 17360bff3e0f17a18d9368f3fd09da200563902a
Author: NicholasFarrow <nicholas.w.farrow@gmail.com>
Date: Thu, 26 Mar 2020 23:16:54 +1100
Implemented wallet import format (WIF) conversion of private key, for easy import to wallet software
Diffstat:
4 files changed, 316 insertions(+), 0 deletions(-)
diff --git a/create_pubkey.h b/createPubKey.h
diff --git a/lib/base58.c b/lib/base58.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2012-2014 Luke Dashjr
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the standard MIT license. See COPYING for more details.
+ */
+
+#ifndef WIN32
+#include <arpa/inet.h>
+#else
+#include <winsock2.h>
+#endif
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "libbase58.h"
+
+bool (*b58_sha256_impl)(void *, const void *, size_t) = NULL;
+
+static const int8_t b58digits_map[] = {
+ -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8,-1,-1,-1,-1,-1,-1,
+ -1, 9,10,11,12,13,14,15, 16,-1,17,18,19,20,21,-1,
+ 22,23,24,25,26,27,28,29, 30,31,32,-1,-1,-1,-1,-1,
+ -1,33,34,35,36,37,38,39, 40,41,42,43,-1,44,45,46,
+ 47,48,49,50,51,52,53,54, 55,56,57,-1,-1,-1,-1,-1,
+};
+
+typedef uint64_t b58_maxint_t;
+typedef uint32_t b58_almostmaxint_t;
+#define b58_almostmaxint_bits (sizeof(b58_almostmaxint_t) * 8)
+static const b58_almostmaxint_t b58_almostmaxint_mask = ((((b58_maxint_t)1) << b58_almostmaxint_bits) - 1);
+
+bool b58tobin(void *bin, size_t *binszp, const char *b58, size_t b58sz)
+{
+ size_t binsz = *binszp;
+ const unsigned char *b58u = (void*)b58;
+ unsigned char *binu = bin;
+ size_t outisz = (binsz + sizeof(b58_almostmaxint_t) - 1) / sizeof(b58_almostmaxint_t);
+ b58_almostmaxint_t outi[outisz];
+ b58_maxint_t t;
+ b58_almostmaxint_t c;
+ size_t i, j;
+ uint8_t bytesleft = binsz % sizeof(b58_almostmaxint_t);
+ b58_almostmaxint_t zeromask = bytesleft ? (b58_almostmaxint_mask << (bytesleft * 8)) : 0;
+ unsigned zerocount = 0;
+
+ if (!b58sz)
+ b58sz = strlen(b58);
+
+ for (i = 0; i < outisz; ++i) {
+ outi[i] = 0;
+ }
+
+ // Leading zeros, just count
+ for (i = 0; i < b58sz && b58u[i] == '1'; ++i)
+ ++zerocount;
+
+ for ( ; i < b58sz; ++i)
+ {
+ if (b58u[i] & 0x80)
+ // High-bit set on invalid digit
+ return false;
+ if (b58digits_map[b58u[i]] == -1)
+ // Invalid base58 digit
+ return false;
+ c = (unsigned)b58digits_map[b58u[i]];
+ for (j = outisz; j--; )
+ {
+ t = ((b58_maxint_t)outi[j]) * 58 + c;
+ c = t >> b58_almostmaxint_bits;
+ outi[j] = t & b58_almostmaxint_mask;
+ }
+ if (c)
+ // Output number too big (carry to the next int32)
+ return false;
+ if (outi[0] & zeromask)
+ // Output number too big (last int32 filled too far)
+ return false;
+ }
+
+ j = 0;
+ if (bytesleft) {
+ for (i = bytesleft; i > 0; --i) {
+ *(binu++) = (outi[0] >> (8 * (i - 1))) & 0xff;
+ }
+ ++j;
+ }
+
+ for (; j < outisz; ++j)
+ {
+ for (i = sizeof(*outi); i > 0; --i) {
+ *(binu++) = (outi[j] >> (8 * (i - 1))) & 0xff;
+ }
+ }
+
+ // Count canonical base58 byte count
+ binu = bin;
+ for (i = 0; i < binsz; ++i)
+ {
+ if (binu[i])
+ break;
+ --*binszp;
+ }
+ *binszp += zerocount;
+
+ return true;
+}
+
+static
+bool my_dblsha256(void *hash, const void *data, size_t datasz)
+{
+ uint8_t buf[0x20];
+ return b58_sha256_impl(buf, data, datasz) && b58_sha256_impl(hash, buf, sizeof(buf));
+}
+
+int b58check(const void *bin, size_t binsz, const char *base58str, size_t b58sz)
+{
+ unsigned char buf[32];
+ const uint8_t *binc = bin;
+ unsigned i;
+ if (binsz < 4)
+ return -4;
+ if (!my_dblsha256(buf, bin, binsz - 4))
+ return -2;
+ if (memcmp(&binc[binsz - 4], buf, 4))
+ return -1;
+
+ // Check number of zeros is correct AFTER verifying checksum (to avoid possibility of accessing base58str beyond the end)
+ for (i = 0; binc[i] == '\0' && base58str[i] == '1'; ++i)
+ {} // Just finding the end of zeros, nothing to do in loop
+ if (binc[i] == '\0' || base58str[i] == '1')
+ return -3;
+
+ return binc[0];
+}
+
+static const char b58digits_ordered[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+
+bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz)
+{
+ const uint8_t *bin = data;
+ int carry;
+ size_t i, j, high, zcount = 0;
+ size_t size;
+
+ while (zcount < binsz && !bin[zcount])
+ ++zcount;
+
+ size = (binsz - zcount) * 138 / 100 + 1;
+ uint8_t buf[size];
+ memset(buf, 0, size);
+
+ for (i = zcount, high = size - 1; i < binsz; ++i, high = j)
+ {
+ for (carry = bin[i], j = size - 1; (j > high) || carry; --j)
+ {
+ carry += 256 * buf[j];
+ buf[j] = carry % 58;
+ carry /= 58;
+ if (!j) {
+ // Otherwise j wraps to maxint which is > high
+ break;
+ }
+ }
+ }
+
+ for (j = 0; j < size && !buf[j]; ++j);
+
+ if (*b58sz <= zcount + size - j)
+ {
+ *b58sz = zcount + size - j + 1;
+ return false;
+ }
+
+ if (zcount)
+ memset(b58, '1', zcount);
+ for (i = zcount; j < size; ++i, ++j)
+ b58[i] = b58digits_ordered[buf[j]];
+ b58[i] = '\0';
+ *b58sz = i + 1;
+
+ return true;
+}
+
+bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver, const void *data, size_t datasz)
+{
+ uint8_t buf[1 + datasz + 0x20];
+ uint8_t *hash = &buf[1 + datasz];
+
+ buf[0] = ver;
+ memcpy(&buf[1], data, datasz);
+ if (!my_dblsha256(hash, buf, datasz + 1))
+ {
+ *b58c_sz = 0;
+ return false;
+ }
+
+ return b58enc(b58c, b58c_sz, buf, 1 + datasz + 4);
+}
diff --git a/lib/libbase58.h b/lib/libbase58.h
@@ -0,0 +1,23 @@
+#ifndef LIBBASE58_H
+#define LIBBASE58_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern bool (*b58_sha256_impl)(void *, const void *, size_t);
+
+extern bool b58tobin(void *bin, size_t *binsz, const char *b58, size_t b58sz);
+extern int b58check(const void *bin, size_t binsz, const char *b58, size_t b58sz);
+
+extern bool b58enc(char *b58, size_t *b58sz, const void *bin, size_t binsz);
+extern bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver, const void *data, size_t datasz);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/walletImportFormat.h b/walletImportFormat.h
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <openssl/sha.h>
+#include <openssl/ripemd.h>
+#include "lib/base58.c"
+
+/* https://en.bitcoin.it/wiki/Wallet_import_format */
+
+char *create_wif(const unsigned char *privatekey) {
+ unsigned char newKey[65];
+ unsigned char SHAkey[65];
+ unsigned char SHAkey2[65];
+ unsigned char checksum[11];
+ unsigned char combinedKey[75];
+
+ size_t combinedKeySize = 37;
+ size_t wifSize = 52;
+ char wif[52];
+
+ wifSize = 80;
+
+ /* Add 0x80 byte in front */
+ newKey[0] = 128;
+ for(int i=0; i<32; i++) {
+ newKey[i+1] = privatekey[i];
+ }
+
+ /*
+ for(int i=0; i<32; i++) {
+ printf("%02X", privatekey[i]);
+ }
+ printf("\n");
+
+ for(int i=0; i<33; i++) {
+ printf("%02X", newKey[i]);
+ }
+ printf("\n");
+ */
+
+ /* Perform SHA-256 hash on the extended key */
+ SHA256(newKey, 33, SHAkey);
+ /*
+ for(int i=0; i<32; i++) {
+ printf("%02X", SHAkey[i]);
+ }
+ printf("\n");
+ */
+
+ /* Perform SHA-256 hash again on the result */
+ SHA256(SHAkey, 32, SHAkey2);
+ /*
+ for(int i=0; i<32; i++) {
+ printf("%02X", SHAkey2[i]);
+ }
+ printf("\n");
+ */
+
+ /* Checksum is first 4 bytes of 2nd SHA*/
+ for(int i=0; i<4; i++) {
+ checksum[i] = SHAkey2[i];
+ }
+
+ /*
+ for(int i=0; i<4; i++) {
+ printf("%02X", checksum[i]);
+ }
+ printf("\n");
+ */
+
+ /* Append checksum to end of 2nd SHA */
+ for(int i=0; i<33; i++) {
+ combinedKey[i] = newKey[i];
+ }
+ for(int i=0; i<4; i++) {
+ combinedKey[33+i] = checksum[i];
+ }
+ /*
+ for(int i=0; i<37; i++) {
+ printf("%02X", combinedKey[i]);
+ }
+ printf("\n");
+ */
+
+ /* Encode with base-58 */
+ b58enc(wif, &wifSize, combinedKey, combinedKeySize);
+ puts(wif);
+
+ return 0;
+}
