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psbt: helpers for adding a pubkey or signature to a psbt 

we'll use these for the commitment txs!
This commit is contained in:
niftynei 2020-05-27 18:09:01 -05:00 committed by Christian Decker
parent 3c6e3eecee
commit 000ef2079c
4 changed files with 84 additions and 0 deletions
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63
bitcoin/psbt.c
View File

@ -1,7 +1,10 @@
#include <assert.h>
#include <bitcoin/psbt.h>
#include <bitcoin/pubkey.h>
#include <bitcoin/script.h>
#include <bitcoin/signature.h>
#include <ccan/cast/cast.h>
#include <ccan/ccan/array_size/array_size.h>
#include <common/amount.h>
#include <common/utils.h>
#include <string.h>
@ -153,6 +156,66 @@ void psbt_rm_output(struct wally_psbt *psbt,
REMOVE_ELEM(psbt->outputs, remove_at, psbt->num_outputs);
psbt->num_outputs -= 1;
}
void psbt_input_add_pubkey(struct wally_psbt *psbt, size_t in,
const struct pubkey *pubkey)
{
int wally_err;
u32 empty_path[1] = {0};
unsigned char fingerprint[4];
struct ripemd160 hash;
u8 pk_der[PUBKEY_CMPR_LEN];
assert(in < psbt->num_inputs);
/* Find the key identifier fingerprint:
* the first 32 bits of the identifier, where the identifier
* is the hash160 of the ECDSA serialized public key
* https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#key-identifiers
* */
pubkey_to_hash160(pubkey, &hash);
memcpy(fingerprint, hash.u.u8, sizeof(fingerprint));
/* we serialize the compressed version of the key, wally likes this */
pubkey_to_der(pk_der, pubkey);
if (!psbt->inputs[in].keypaths)
if (wally_keypath_map_init_alloc(1, &psbt->inputs[in].keypaths) != WALLY_OK)
abort();
wally_err = wally_add_new_keypath(psbt->inputs[in].keypaths,
pk_der, sizeof(pk_der),
fingerprint, sizeof(fingerprint),
empty_path, ARRAY_SIZE(empty_path));
assert(wally_err == WALLY_OK);
}
void psbt_input_set_partial_sig(struct wally_psbt *psbt, size_t in,
const struct pubkey *pubkey,
const struct bitcoin_signature *sig)
{
int wally_err;
u8 pk_der[PUBKEY_CMPR_LEN];
assert(in < psbt->num_inputs);
if (!psbt->inputs[in].partial_sigs)
if (wally_partial_sigs_map_init_alloc(1, &psbt->inputs[in].partial_sigs) != WALLY_OK)
abort();
/* we serialize the compressed version of the key, wally likes this */
pubkey_to_der(pk_der, pubkey);
wally_err = wally_add_new_partial_sig(psbt->inputs[in].partial_sigs,
pk_der, sizeof(pk_der),
cast_const(unsigned char *, sig->s.data),
sizeof(sig->s.data));
assert(wally_err == WALLY_OK);
wally_err = wally_psbt_input_set_sighash_type(&psbt->inputs[in],
sig->sighash_type);
assert(wally_err == WALLY_OK);
}
void psbt_input_set_prev_utxo(struct wally_psbt *psbt, size_t in,
const u8 *scriptPubkey, struct amount_sat amt)
{

9
bitcoin/psbt.h
View File

@ -11,6 +11,8 @@ struct wally_psbt;
struct wally_psbt_input;
struct wally_tx;
struct amount_sat;
struct bitcoin_signature;
struct pubkey;
int wally_psbt_clone(const struct wally_psbt *psbt, struct wally_psbt **output);
@ -33,6 +35,13 @@ struct wally_psbt_output *psbt_add_output(struct wally_psbt *psbt,
void psbt_rm_output(struct wally_psbt *psbt,
size_t remove_at);
void psbt_input_add_pubkey(struct wally_psbt *psbt, size_t in,
const struct pubkey *pubkey);
void psbt_input_set_partial_sig(struct wally_psbt *psbt, size_t in,
const struct pubkey *pubkey,
const struct bitcoin_signature *sig);
void psbt_input_set_prev_utxo(struct wally_psbt *psbt, size_t in,
const u8 *wscript, struct amount_sat amt);
void psbt_input_set_prev_utxo_wscript(struct wally_psbt *psbt, size_t in,

6
bitcoin/test/run-bitcoin_block_from_hex.c
View File

@ -58,6 +58,12 @@ bool is_p2wpkh(const u8 *script UNNEEDED, struct bitcoin_address *addr UNNEEDED)
/* Generated stub for is_p2wsh */
bool is_p2wsh(const u8 *script UNNEEDED, struct sha256 *addr UNNEEDED)
{ fprintf(stderr, "is_p2wsh called!\n"); abort(); }
/* Generated stub for pubkey_to_der */
void pubkey_to_der(u8 der[PUBKEY_CMPR_LEN] UNNEEDED, const struct pubkey *key UNNEEDED)
{ fprintf(stderr, "pubkey_to_der called!\n"); abort(); }
/* Generated stub for pubkey_to_hash160 */
void pubkey_to_hash160(const struct pubkey *pk UNNEEDED, struct ripemd160 *hash UNNEEDED)
{ fprintf(stderr, "pubkey_to_hash160 called!\n"); abort(); }
/* Generated stub for scriptpubkey_p2wsh */
u8 *scriptpubkey_p2wsh(const tal_t *ctx UNNEEDED, const u8 *witnessscript UNNEEDED)
{ fprintf(stderr, "scriptpubkey_p2wsh called!\n"); abort(); }

6
bitcoin/test/run-tx-encode.c
View File

@ -59,6 +59,12 @@ bool is_p2wpkh(const u8 *script UNNEEDED, struct bitcoin_address *addr UNNEEDED)
/* Generated stub for is_p2wsh */
bool is_p2wsh(const u8 *script UNNEEDED, struct sha256 *addr UNNEEDED)
{ fprintf(stderr, "is_p2wsh called!\n"); abort(); }
/* Generated stub for pubkey_to_der */
void pubkey_to_der(u8 der[PUBKEY_CMPR_LEN] UNNEEDED, const struct pubkey *key UNNEEDED)
{ fprintf(stderr, "pubkey_to_der called!\n"); abort(); }
/* Generated stub for pubkey_to_hash160 */
void pubkey_to_hash160(const struct pubkey *pk UNNEEDED, struct ripemd160 *hash UNNEEDED)
{ fprintf(stderr, "pubkey_to_hash160 called!\n"); abort(); }
/* Generated stub for scriptpubkey_p2wsh */
u8 *scriptpubkey_p2wsh(const tal_t *ctx UNNEEDED, const u8 *witnessscript UNNEEDED)
{ fprintf(stderr, "scriptpubkey_p2wsh called!\n"); abort(); }