139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
#include "bitcoin_tx.h"
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#include <ccan/crypto/sha256/sha256.h>
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#include <ccan/endian/endian.h>
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#include <assert.h>
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static void add_varint(varint_t v,
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void (*add)(const void *, size_t, void *), void *addp)
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{
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u8 buf[9], *p = buf;
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if (v < 0xfd) {
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*(p++) = v;
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} else if (v <= 0xffff) {
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(*p++) = 0xfd;
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(*p++) = v >> 8;
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(*p++) = v;
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} else if (v <= 0xffffffff) {
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(*p++) = 0xfe;
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(*p++) = v >> 24;
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(*p++) = v >> 16;
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(*p++) = v >> 8;
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(*p++) = v;
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} else {
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(*p++) = 0xff;
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(*p++) = v >> 56;
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(*p++) = v >> 48;
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(*p++) = v >> 40;
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(*p++) = v >> 32;
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(*p++) = v >> 24;
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(*p++) = v >> 16;
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(*p++) = v >> 8;
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(*p++) = v;
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}
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add(buf, p - buf, addp);
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}
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static void add_le32(u32 v,
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void (*add)(const void *, size_t, void *), void *addp)
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{
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le32 l = cpu_to_le32(v);
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add(&l, sizeof(l), addp);
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}
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static void add_le64(u64 v,
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void (*add)(const void *, size_t, void *), void *addp)
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{
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le64 l = cpu_to_le64(v);
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add(&l, sizeof(l), addp);
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}
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static void add_tx_input(const struct bitcoin_tx_input *input,
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void (*add)(const void *, size_t, void *), void *addp)
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{
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add(&input->txid, sizeof(input->txid), addp);
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add_le32(input->index, add, addp);
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add_varint(input->script_length, add, addp);
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add(input->script, input->script_length, addp);
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add_le32(input->sequence_number, add, addp);
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}
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static void add_tx_output(const struct bitcoin_tx_output *output,
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void (*add)(const void *, size_t, void *), void *addp)
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{
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add_le64(output->amount, add, addp);
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add_varint(output->script_length, add, addp);
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add(output->script, output->script_length, addp);
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}
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static void add_tx(const struct bitcoin_tx *tx,
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void (*add)(const void *, size_t, void *), void *addp)
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{
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varint_t i;
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add_le32(tx->version, add, addp);
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add_varint(tx->input_count, add, addp);
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for (i = 0; i < tx->input_count; i++)
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add_tx_input(&tx->input[i], add, addp);
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add_varint(tx->output_count, add, addp);
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for (i = 0; i < tx->output_count; i++)
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add_tx_output(&tx->output[i], add, addp);
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add_le32(tx->lock_time, add, addp);
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}
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static void add_sha(const void *data, size_t len, void *shactx_)
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{
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struct sha256_ctx *ctx = shactx_;
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sha256_update(ctx, data, len);
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}
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void sha256_tx(struct sha256_ctx *ctx, const struct bitcoin_tx *tx)
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{
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add_tx(tx, add_sha, ctx);
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}
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static void add_linearize(const void *data, size_t len, void *pptr_)
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{
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u8 **pptr = pptr_;
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size_t oldsize = tal_count(*pptr);
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tal_resize(pptr, oldsize + len);
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memcpy(*pptr + oldsize, data, len);
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}
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u8 *linearize_tx(const tal_t *ctx, const struct bitcoin_tx *tx)
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{
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u8 *arr = tal_arr(ctx, u8, 0);
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add_tx(tx, add_linearize, &arr);
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return arr;
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}
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void bitcoin_txid(const struct bitcoin_tx *tx, struct sha256_double *txid)
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{
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struct sha256_ctx ctx = SHA256_INIT;
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sha256_tx(&ctx, tx);
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sha256_double_done(&ctx, txid);
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}
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struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
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varint_t output_count)
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{
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struct bitcoin_tx *tx = tal(ctx, struct bitcoin_tx);
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size_t i;
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tx->version = BITCOIN_TX_VERSION;
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tx->output_count = output_count;
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tx->output = tal_arrz(tx, struct bitcoin_tx_output, output_count);
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tx->input_count = input_count;
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tx->input = tal_arrz(tx, struct bitcoin_tx_input, input_count);
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for (i = 0; i < tx->input_count; i++) {
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/* We assume NULL is a zero bitmap */
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assert(tx->input[i].script == NULL);
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tx->input[i].sequence_number = 0xFFFFFFFF;
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}
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tx->lock_time = 0xFFFFFFFF;
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return tx;
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}
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