131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/* Converted to C by Rusty Russell, based on bitcoin source: */
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// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2012 The Bitcoin Developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "address.h"
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#include "base58.h"
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#include "privkey.h"
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#include "pubkey.h"
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#include "shadouble.h"
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#include <assert.h>
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#include <ccan/build_assert/build_assert.h>
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#include <ccan/tal/str/str.h>
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#include <common/utils.h>
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#include <string.h>
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#include <wally_core.h>
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static char *to_base58(const tal_t *ctx, u8 version,
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const struct ripemd160 *rmd)
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{
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char *out;
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size_t total_length = sizeof(*rmd) + 1;
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u8 buf[total_length];
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buf[0] = version;
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memcpy(buf + 1, rmd, sizeof(*rmd));
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tal_wally_start();
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if (wally_base58_from_bytes((const unsigned char *) buf,
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total_length, BASE58_FLAG_CHECKSUM, &out)
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!= WALLY_OK)
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out = NULL;
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tal_wally_end(tal_steal(ctx, out));
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return out;
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}
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char *bitcoin_to_base58(const tal_t *ctx, const struct chainparams *chainparams,
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const struct bitcoin_address *addr)
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{
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return to_base58(ctx, chainparams->p2pkh_version, &addr->addr);
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}
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char *p2sh_to_base58(const tal_t *ctx, const struct chainparams *chainparams,
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const struct ripemd160 *p2sh)
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{
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return to_base58(ctx, chainparams->p2sh_version, p2sh);
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}
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static bool from_base58(u8 *version,
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struct ripemd160 *rmd,
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const char *base58, size_t base58_len)
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{
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u8 buf[1 + sizeof(*rmd) + 4];
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/* Avoid memcheck complaining if decoding resulted in a short value */
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size_t buflen = sizeof(buf);
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memset(buf, 0, buflen);
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char *terminated_base58 = tal_dup_arr(NULL, char, base58, base58_len, 1);
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terminated_base58[base58_len] = '\0';
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size_t written = 0;
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int r = wally_base58_to_bytes(terminated_base58, BASE58_FLAG_CHECKSUM, buf, buflen, &written);
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tal_free(terminated_base58);
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if (r != WALLY_OK || written > buflen) {
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return false;
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}
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*version = buf[0];
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memcpy(rmd, buf + 1, sizeof(*rmd));
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return true;
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}
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bool bitcoin_from_base58(u8 *version, struct bitcoin_address *addr,
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const char *base58, size_t len)
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{
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return from_base58(version, &addr->addr, base58, len);
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}
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bool p2sh_from_base58(u8 *version, struct ripemd160 *p2sh, const char *base58,
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size_t len)
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{
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return from_base58(version, p2sh, base58, len);
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}
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bool ripemd160_from_base58(u8 *version, struct ripemd160 *rmd,
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const char *base58, size_t base58_len)
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{
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return from_base58(version, rmd, base58, base58_len);
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}
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bool key_from_base58(const char *base58, size_t base58_len,
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bool *test_net, struct privkey *priv, struct pubkey *key)
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{
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// 1 byte version, 32 byte private key, 1 byte compressed, 4 byte checksum
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u8 keybuf[1 + 32 + 1 + 4];
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char *terminated_base58 = tal_dup_arr(NULL, char, base58, base58_len, 1);
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terminated_base58[base58_len] = '\0';
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size_t keybuflen = sizeof(keybuf);
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size_t written = 0;
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int r = wally_base58_to_bytes(terminated_base58, BASE58_FLAG_CHECKSUM, keybuf, keybuflen, &written);
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wally_bzero(terminated_base58, base58_len + 1);
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tal_free(terminated_base58);
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if (r != WALLY_OK || written > keybuflen)
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return false;
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/* Byte after key should be 1 to represent a compressed key. */
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if (keybuf[1 + 32] != 1)
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return false;
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if (keybuf[0] == 128)
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*test_net = false;
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else if (keybuf[0] == 239)
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*test_net = true;
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else
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return false;
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/* Copy out secret. */
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memcpy(priv->secret.data, keybuf + 1, sizeof(priv->secret.data));
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if (!secp256k1_ec_seckey_verify(secp256k1_ctx, priv->secret.data))
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return false;
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/* Get public key, too. */
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if (!pubkey_from_privkey(priv, key))
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return false;
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return true;
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}
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