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ccff3ac437
This is a bit tricky: for our signing code, we don't want scriptsigs, but to calculate the txid, we need them. For most transactions in lightning, they're pure segwit so it doesn't matter, but funding transactions can have P2SH-wrapped P2WPKH inputs. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
136 lines
4.4 KiB
C
136 lines
4.4 KiB
C
#include <bitcoin/base58.h>
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#include <bitcoin/privkey.h>
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#include <bitcoin/pubkey.h>
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#include <ccan/str/hex/hex.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <type_to_string.h>
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#include <utils.h>
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#define SUPERVERBOSE printf
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#include "../funding_tx.c"
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#undef SUPERVERBOSE
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#include "../key_derive.c"
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#if 0
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static struct sha256 sha256_from_hex(const char *hex)
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{
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struct sha256 sha256;
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if (strstarts(hex, "0x"))
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hex += 2;
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if (!hex_decode(hex, strlen(hex), &sha256, sizeof(sha256)))
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abort();
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return sha256;
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}
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static struct privkey privkey_from_hex(const char *hex)
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{
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struct privkey pk;
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size_t len;
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if (strstarts(hex, "0x"))
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hex += 2;
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len = strlen(hex);
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if (len == 66 && strends(hex, "01"))
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len -= 2;
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if (!hex_decode(hex, len, &pk, sizeof(pk)))
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abort();
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return pk;
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}
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#endif
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int main(void)
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{
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tal_t *tmpctx = tal_tmpctx(NULL);
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struct bitcoin_tx *input, *funding;
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u64 fee;
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struct pubkey local_funding_pubkey, remote_funding_pubkey;
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struct privkey input_privkey;
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struct pubkey inputkey;
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bool testnet;
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struct utxo utxo;
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const struct utxo **utxomap = tal_arr(tmpctx, const struct utxo *, 1);
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u64 funding_satoshis;
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u32 funding_outnum;
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u8 *subscript;
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secp256k1_ecdsa_signature sig;
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secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY
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| SECP256K1_CONTEXT_SIGN);
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/* BOLT #3:
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*
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* Block 1 coinbase transaction: 01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff03510101ffffffff0100f2052a010000001976a9143ca33c2e4446f4a305f23c80df8ad1afdcf652f988ac00000000
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*/
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input = bitcoin_tx_from_hex(tmpctx,
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"01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff03510101ffffffff0100f2052a010000001976a9143ca33c2e4446f4a305f23c80df8ad1afdcf652f988ac00000000",
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strlen("01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff03510101ffffffff0100f2052a010000001976a9143ca33c2e4446f4a305f23c80df8ad1afdcf652f988ac00000000"));
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assert(input);
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/* BOLT #3:
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* Block 1 coinbase privkey: 6bd078650fcee8444e4e09825227b801a1ca928debb750eb36e6d56124bb20e80101
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* # privkey in base58: cRCH7YNcarfvaiY1GWUKQrRGmoezvfAiqHtdRvxe16shzbd7LDMz
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*/
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if (!key_from_base58("cRCH7YNcarfvaiY1GWUKQrRGmoezvfAiqHtdRvxe16shzbd7LDMz", strlen("cRCH7YNcarfvaiY1GWUKQrRGmoezvfAiqHtdRvxe16shzbd7LDMz"),
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&testnet, &input_privkey, &inputkey))
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abort();
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assert(testnet);
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printf("* Block 1 coinbase privkey: %s01\n",
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type_to_string(tmpctx, struct privkey, &input_privkey));
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/* BOLT #3:
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*
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* The funding transaction is paid to the following keys:
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*
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* local_funding_pubkey: 023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb
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* remote_funding_pubkey: 030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1
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*/
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if (!pubkey_from_hexstr("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb",
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strlen("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb"),
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&local_funding_pubkey))
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abort();
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if (!pubkey_from_hexstr("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1",
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strlen("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1"),
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&remote_funding_pubkey))
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abort();
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bitcoin_txid(input, &utxo.txid);
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utxo.outnum = 0;
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utxo.amount = 5000000000;
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utxo.is_p2sh = false;
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funding_satoshis = 10000000;
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fee = 13920;
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printf("input[0] txid: %s\n",
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tal_hexstr(tmpctx, &utxo.txid, sizeof(utxo.txid)));
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printf("input[0] input: %u\n", utxo.outnum);
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printf("input[0] satoshis: %"PRIu64"\n", utxo.amount);
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printf("funding satoshis: %"PRIu64"\n", funding_satoshis);
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utxomap[0] = &utxo;
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funding = funding_tx(tmpctx, &funding_outnum, utxomap,
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funding_satoshis,
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&local_funding_pubkey,
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&remote_funding_pubkey,
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utxo.amount - fee - funding_satoshis,
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&inputkey, NULL);
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printf("# fee: %"PRIu64"\n", fee);
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printf("change satoshis: %"PRIu64"\n",
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funding->output[!funding_outnum].amount);
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printf("funding output: %u\n", funding_outnum);
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subscript = scriptpubkey_p2pkh(funding, &inputkey);
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sign_tx_input(funding, 0, subscript, NULL, &input_privkey, &inputkey,
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&sig);
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funding->input[0].script = bitcoin_redeem_p2pkh(funding, &inputkey,
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&sig);
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printf("funding tx: %s\n",
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tal_hex(tmpctx, linearize_tx(tmpctx, funding)));
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/* No memory leaks please */
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secp256k1_context_destroy(secp256k1_ctx);
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tal_free(tmpctx);
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return 0;
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}
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