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/* Converted to C by Rusty Russell, based on bitcoin source: */
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin Developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "address.h"
#include "base58.h"
#include "libbase58/libbase58.h"
#include "privkey.h"
#include "pubkey.h"
#include "shadouble.h"
#include "utils.h"
#include <assert.h>
#include <ccan/build_assert/build_assert.h>
#include <ccan/tal/str/str.h>
#include <secp256k1.h>
#include <string.h>
static bool my_sha256(void *digest, const void *data, size_t datasz)
{
sha256(digest, data, datasz);
return true;
}
static char *to_base58(const tal_t *ctx, u8 version,
const struct ripemd160 *rmd)
{
char out[BASE58_ADDR_MAX_LEN + 1];
size_t outlen = sizeof(out);
b58_sha256_impl = my_sha256;
if (!b58check_enc(out, &outlen, version, rmd, sizeof(*rmd))) {
return NULL;
}else{
return tal_strdup(ctx, out);
}
}
char *bitcoin_to_base58(const tal_t *ctx, bool test_net,
const struct bitcoin_address *addr)
{
return to_base58(ctx, test_net ? 111 : 0, &addr->addr);
}
char *p2sh_to_base58(const tal_t *ctx, bool test_net,
const struct ripemd160 *p2sh)
{
return to_base58(ctx, test_net ? 196 : 5, p2sh);
}
static bool from_base58(u8 *version,
struct ripemd160 *rmd,
const char *base58, size_t base58_len)
{
u8 buf[1 + sizeof(*rmd) + 4];
b58_sha256_impl = my_sha256;
size_t buflen = sizeof(buf);
b58tobin(buf, &buflen, base58, base58_len);
int r = b58check(buf, sizeof(buf), base58, base58_len);
*version = buf[0];
memcpy(rmd, buf + 1, sizeof(*rmd));
return r > 0;
}
bool bitcoin_from_base58(bool *test_net,
struct bitcoin_address *addr,
const char *base58, size_t len)
{
u8 version;
if (!from_base58(&version, &addr->addr, base58, len))
return false;
if (version == 111)
*test_net = true;
else if (version == 0)
*test_net = false;
else
return false;
return true;
}
bool p2sh_from_base58(bool *test_net,
struct ripemd160 *p2sh,
const char *base58, size_t len)
{
u8 version;
if (!from_base58(&version, p2sh, base58, len))
return false;
if (version == 196)
*test_net = true;
else if (version == 5)
*test_net = false;
else
return false;
return true;
}
bool ripemd_from_base58(u8 *version,
struct ripemd160 *ripemd160,
const char *base58)
{
return from_base58(version, ripemd160, base58, strlen(base58));
}
char *key_to_base58(const tal_t *ctx, bool test_net, const struct privkey *key)
{
u8 buf[32 + 1];
char out[BASE58_KEY_MAX_LEN + 2];
u8 version = test_net ? 239 : 128;
size_t outlen = sizeof(out);
memcpy(buf, key->secret, sizeof(key->secret));
/* Mark this as a compressed key. */
buf[32] = 1;
b58_sha256_impl = my_sha256;
b58check_enc(out, &outlen, version, buf, sizeof(buf));
return tal_strdup(ctx, out);
}
bool key_from_base58(const char *base58, size_t base58_len,
bool *test_net, struct privkey *priv, struct pubkey *key)
{
// 1 byte version, 32 byte private key, 1 byte compressed, 4 byte checksum
u8 keybuf[1 + 32 + 1 + 4];
size_t keybuflen = sizeof(keybuf);
b58_sha256_impl = my_sha256;
b58tobin(keybuf, &keybuflen, base58, base58_len);
if (b58check(keybuf, sizeof(keybuf), base58, base58_len) < 0)
return false;
/* Byte after key should be 1 to represent a compressed key. */
if (keybuf[1 + 32] != 1)
return false;
if (keybuf[0] == 128)
*test_net = false;
else if (keybuf[0] == 239)
*test_net = true;
else
return false;
/* Copy out secret. */
memcpy(priv->secret, keybuf + 1, sizeof(priv->secret));
if (!secp256k1_ec_seckey_verify(secp256k1_ctx, priv->secret))
return false;
/* Get public key, too. */
if (!pubkey_from_privkey(priv, key))
return false;
return true;
}