psbt: expose accessors for inputs taproot internal key

Author: jgriffiths

include/wally.hpp

@@ -1420,6 +1420,12 @@ inline int psbt_input_set_signatures(const INPUT& input, const struct wally_map*
     return detail::check_ret(__FUNCTION__, ret);
 }
 
+template <class INPUT, class PUB_KEY>
+inline int psbt_input_set_taproot_internal_key(const INPUT& input, const PUB_KEY& pub_key) {
+    int ret = ::wally_psbt_input_set_taproot_internal_key(detail::get_p(input), pub_key.data(), pub_key.size());
+    return detail::check_ret(__FUNCTION__, ret);
+}
+
 template <class INPUT, class TAP_SIG>
 inline int psbt_input_set_taproot_signature(const INPUT& input, const TAP_SIG& tap_sig) {
     int ret = ::wally_psbt_input_set_taproot_signature(detail::get_p(input), tap_sig.data(), tap_sig.size());

include/wally_psbt.h

@@ -354,6 +354,18 @@ WALLY_CORE_API int wally_psbt_input_set_taproot_signature(
     const unsigned char *tap_sig,
     size_t tap_sig_len);
 
+/**
+ * Set the taproot internal public key in an input.
+ *
+ * :param input: The input to update.
+ * :param pub_key: The x-only internal public key for this input.
+ * :param pub_key_len: The length of ``pub_key`` in bytes. Must be `EC_XONLY_PUBLIC_KEY_LEN`.
+ */
+WALLY_CORE_API int wally_psbt_input_set_taproot_internal_key(
+    struct wally_psbt_input *input,
+    const unsigned char *pub_key,
+    size_t pub_key_len);
+
 /**
  * Find a partial signature matching a pubkey in an input.
  *

include/wally_psbt_members.h

@@ -52,6 +52,8 @@ WALLY_CORE_API int wally_psbt_get_input_signature(const struct wally_psbt *psbt,
 WALLY_CORE_API int wally_psbt_get_input_signature_len(const struct wally_psbt *psbt, size_t index, size_t subindex, size_t *written);
 WALLY_CORE_API int wally_psbt_get_input_taproot_signature(const struct wally_psbt *psbt, size_t index, unsigned char *bytes_out, size_t len, size_t *written);
 WALLY_CORE_API int wally_psbt_get_input_taproot_signature_len(const struct wally_psbt *psbt, size_t index, size_t *written);
+WALLY_CORE_API int wally_psbt_get_input_taproot_internal_key(const struct wally_psbt *psbt, size_t index, unsigned char *bytes_out, size_t len, size_t *written);
+WALLY_CORE_API int wally_psbt_get_input_taproot_internal_key_len(const struct wally_psbt *psbt, size_t index, size_t *written);
 WALLY_CORE_API int wally_psbt_get_input_unknowns_size(const struct wally_psbt *psbt, size_t index, size_t *written);
 WALLY_CORE_API int wally_psbt_find_input_unknown(const struct wally_psbt *psbt, size_t index, const unsigned char *key, size_t key_len, size_t *written);
 WALLY_CORE_API int wally_psbt_get_input_unknown(const struct wally_psbt *psbt, size_t index, size_t subindex, unsigned char *bytes_out, size_t len, size_t *written);
@@ -79,6 +81,7 @@ WALLY_CORE_API int wally_psbt_set_input_final_witness(struct wally_psbt *psbt, s
 WALLY_CORE_API int wally_psbt_set_input_keypaths(struct wally_psbt *psbt, size_t index, const struct wally_map *map_in);
 WALLY_CORE_API int wally_psbt_set_input_signatures(struct wally_psbt *psbt, size_t index, const struct wally_map *map_in);
 WALLY_CORE_API int wally_psbt_set_input_taproot_signature(struct wally_psbt *psbt, size_t index, const unsigned char *sig, size_t sig_len);
+WALLY_CORE_API int wally_psbt_set_input_taproot_internal_key(struct wally_psbt *psbt, size_t index, const unsigned char *pub_key, size_t pub_key_len);
 WALLY_CORE_API int wally_psbt_add_input_signature(struct wally_psbt *psbt, size_t index, const unsigned char *pub_key, size_t pub_key_len, const unsigned char *sig, size_t sig_len);
 WALLY_CORE_API int wally_psbt_set_input_unknowns(struct wally_psbt *psbt, size_t index, const struct wally_map *map_in);
 WALLY_CORE_API int wally_psbt_set_input_sighash(struct wally_psbt *psbt, size_t index, uint32_t sighash);

src/psbt.c

@@ -389,6 +389,7 @@ MAP_INNER_FIELD(input, redeem_script, PSBT_IN_REDEEM_SCRIPT, psbt_fields)
 MAP_INNER_FIELD(input, witness_script, PSBT_IN_WITNESS_SCRIPT, psbt_fields)
 MAP_INNER_FIELD(input, final_scriptsig, PSBT_IN_FINAL_SCRIPTSIG, psbt_fields)
 MAP_INNER_FIELD(input, taproot_signature, PSBT_IN_TAP_KEY_SIG, psbt_fields)
+MAP_INNER_FIELD(input, taproot_internal_key, PSBT_IN_TAP_INTERNAL_KEY, psbt_fields)
 SET_STRUCT(wally_psbt_input, final_witness, wally_tx_witness_stack,
            wally_tx_witness_stack_clone_alloc, wally_tx_witness_stack_free)
 SET_MAP(wally_psbt_input, keypath,)
@@ -5574,6 +5575,7 @@ PSBT_FIELD(input, redeem_script, PSBT_0)
 PSBT_FIELD(input, witness_script, PSBT_0)
 PSBT_FIELD(input, final_scriptsig, PSBT_0)
 PSBT_FIELD(input, taproot_signature, PSBT_0)
+PSBT_FIELD(input, taproot_internal_key, PSBT_0)
 PSBT_GET_S(input, final_witness, wally_tx_witness_stack, wally_tx_witness_stack_clone_alloc)
 PSBT_GET_M(input, keypath)
 PSBT_GET_M(input, signature)

src/swig_java/swig.i

@@ -802,6 +802,8 @@ static jobjectArray create_jstringArray(JNIEnv *jenv, char **p, size_t len) {
 %returns_size_t(wally_psbt_get_input_signature_hash);
 %returns_size_t(wally_psbt_get_input_signature_len);
 %returns_size_t(wally_psbt_get_input_sighash);
+%returns_size_t(wally_psbt_get_input_taproot_internal_key);
+%returns_size_t(wally_psbt_get_input_taproot_internal_key_len);
 %returns_size_t(wally_psbt_get_input_taproot_signature);
 %returns_size_t(wally_psbt_get_input_taproot_signature_len);
 %returns_size_t(wally_psbt_get_input_unknown);
@@ -913,6 +915,7 @@ static jobjectArray create_jstringArray(JNIEnv *jenv, char **p, size_t len) {
 %returns_void__(wally_psbt_set_input_sighash);
 %returns_void__(wally_psbt_set_input_signatures);
 %returns_void__(wally_psbt_set_input_taproot_signature);
+%returns_void__(wally_psbt_set_input_taproot_internal_key);
 %returns_void__(wally_psbt_set_input_unknowns);
 %returns_void__(wally_psbt_set_input_utxo);
 %returns_void__(wally_psbt_set_input_utxo_rangeproof);
@@ -1292,6 +1295,7 @@ static jobjectArray create_jstringArray(JNIEnv *jenv, char **p, size_t len) {
 %ignore wally_psbt_input_get_inflation_keys_blinding_rangeproof_len;
 %ignore wally_psbt_input_set_inflation_keys_blinding_rangeproof;
 %ignore wally_psbt_input_clear_inflation_keys_blinding_rangeproof;
+%ignore wally_psbt_input_set_taproot_internal_key;
 %ignore wally_psbt_input_set_taproot_signature;
 %ignore wally_psbt_input_get_utxo_rangeproof;
 %ignore wally_psbt_input_get_utxo_rangeproof_len;

src/swig_python/contrib/psbt.py

@@ -336,6 +336,7 @@ def test_psbt(self):
         dummy_sig_tap_default = TAPROOT_SIG_BYTES # SIGHASH_DEFAULT
         dummy_sig_tap_all = TAPROOT_SIG_BYTES + bytearray(b'\x01') # SIGHASH_ALL
         dummy_sig_tap_single = TAPROOT_SIG_BYTES + bytearray(b'\x03') # SIGHASH_SINGLE
+        dummy_tap_internal_key = bytearray(b'\x01' * 32) # Untweaked x-only pubkey
         if is_elements_build():
             dummy_nonce = bytearray(b'\x00' * WALLY_TX_ASSET_CT_NONCE_LEN)
             dummy_bf = bytearray(b'\x00' * BLINDING_FACTOR_LEN)
@@ -493,6 +494,9 @@ def test_psbt(self):
             self._try_get_set_b(psbt_set_input_taproot_signature,
                                 psbt_get_input_taproot_signature,
                                 None, psbt, dummy_sig_tap_default)
+            self._try_get_set_b(psbt_set_input_taproot_internal_key,
+                                psbt_get_input_taproot_internal_key,
+                                None, psbt, dummy_tap_internal_key)
             # Test finding the UXTO an input spends by txid/vout
             utxo_txhash = psbt_get_input_previous_txid(psbt, 0)
             utxo_index = psbt_get_input_output_index(psbt, 0)

src/swig_python/python_extra.py_in

@@ -197,6 +197,7 @@ psbt_get_input_scriptcode = _wrap_bin(psbt_get_input_scriptcode, psbt_get_input_
 psbt_get_input_signature = _wrap_bin(psbt_get_input_signature, psbt_get_input_signature_len)
 psbt_get_input_signature_hash = _wrap_bin(psbt_get_input_signature_hash, SHA256_LEN)
 psbt_get_input_signing_script = _wrap_bin(psbt_get_input_signing_script, psbt_get_input_signing_script_len)
+psbt_get_input_taproot_internal_key = _wrap_bin(psbt_get_input_taproot_internal_key, psbt_get_input_taproot_internal_key_len)
 psbt_get_input_taproot_signature = _wrap_bin(psbt_get_input_taproot_signature, psbt_get_input_taproot_signature_len)
 psbt_get_input_unknown = _wrap_bin(psbt_get_input_unknown, psbt_get_input_unknown_len)
 psbt_get_input_utxo = psbt_get_input_utxo_alloc

src/test/util.py

@@ -548,6 +548,7 @@ class wally_psbt(Structure):
     ('wally_psbt_input_set_sequence', c_int, [POINTER(wally_psbt_input), c_uint32]),
     ('wally_psbt_input_set_sighash', c_int, [POINTER(wally_psbt_input), c_uint32]),
     ('wally_psbt_input_set_signatures', c_int, [POINTER(wally_psbt_input), POINTER(wally_map)]),
+    ('wally_psbt_input_set_taproot_internal_key', c_int, [POINTER(wally_psbt_input), c_void_p, c_size_t]),
     ('wally_psbt_input_set_taproot_signature', c_int, [POINTER(wally_psbt_input), c_void_p, c_size_t]),
     ('wally_psbt_input_set_unknowns', c_int, [POINTER(wally_psbt_input), POINTER(wally_map)]),
     ('wally_psbt_input_set_utxo', c_int, [POINTER(wally_psbt_input), POINTER(wally_tx)]),
@@ -839,6 +840,8 @@ class wally_psbt(Structure):
     ('wally_psbt_get_input_signature', c_int, [POINTER(wally_psbt), c_size_t, c_size_t, c_void_p, c_size_t, c_size_t_p]),
     ('wally_psbt_get_input_signature_len', c_int, [POINTER(wally_psbt), c_size_t, c_size_t, c_size_t_p]),
     ('wally_psbt_get_input_signatures_size', c_int, [POINTER(wally_psbt), c_size_t, c_size_t_p]),
+    ('wally_psbt_get_input_taproot_internal_key', c_int, [POINTER(wally_psbt), c_size_t, c_void_p, c_size_t, c_size_t_p]),
+    ('wally_psbt_get_input_taproot_internal_key_len', c_int, [POINTER(wally_psbt), c_size_t, c_size_t_p]),
     ('wally_psbt_get_input_taproot_signature', c_int, [POINTER(wally_psbt), c_size_t, c_void_p, c_size_t, c_size_t_p]),
     ('wally_psbt_get_input_taproot_signature_len', c_int, [POINTER(wally_psbt), c_size_t, c_size_t_p]),
     ('wally_psbt_get_input_unknown', c_int, [POINTER(wally_psbt), c_size_t, c_size_t, c_void_p, c_size_t, c_size_t_p]),
@@ -922,6 +925,7 @@ class wally_psbt(Structure):
     ('wally_psbt_set_input_sequence', c_int, [POINTER(wally_psbt), c_size_t, c_uint32]),
     ('wally_psbt_set_input_sighash', c_int, [POINTER(wally_psbt), c_size_t, c_uint32]),
     ('wally_psbt_set_input_signatures', c_int, [POINTER(wally_psbt), c_size_t, POINTER(wally_map)]),
+    ('wally_psbt_set_input_taproot_internal_key', c_int, [POINTER(wally_psbt), c_size_t, c_void_p, c_size_t]),
     ('wally_psbt_set_input_taproot_signature', c_int, [POINTER(wally_psbt), c_size_t, c_void_p, c_size_t]),
     ('wally_psbt_set_input_unknowns', c_int, [POINTER(wally_psbt), c_size_t, POINTER(wally_map)]),
     ('wally_psbt_set_input_utxo', c_int, [POINTER(wally_psbt), c_size_t, POINTER(wally_tx)]),

src/wasm_package/src/functions.js

@@ -324,6 +324,7 @@ export function psbt_get_input_signature_hash(psbt: Ref_wally_psbt, index: numbe
 export function psbt_get_input_signature_len(psbt: Ref_wally_psbt, index: number, subindex: number): number;
 export function psbt_get_input_signatures_size(psbt: Ref_wally_psbt, index: number): number;
 export function psbt_get_input_signing_script_len(psbt: Ref_wally_psbt, index: number): number;
+export function psbt_get_input_taproot_internal_key_len(psbt: Ref_wally_psbt, index: number): number;
 export function psbt_get_input_taproot_signature_len(psbt: Ref_wally_psbt, index: number): number;
 export function psbt_get_input_unknown_len(psbt: Ref_wally_psbt, index: number, subindex: number): number;
 export function psbt_get_input_unknowns_size(psbt: Ref_wally_psbt, index: number): number;
@@ -435,6 +436,7 @@ export function psbt_input_set_required_locktime(input: Ref_wally_psbt_input, re
 export function psbt_input_set_sequence(input: Ref_wally_psbt_input, sequence: number): void;
 export function psbt_input_set_sighash(input: Ref_wally_psbt_input, sighash: number): void;
 export function psbt_input_set_signatures(input: Ref_wally_psbt_input, map_in: Ref_wally_map): void;
+export function psbt_input_set_taproot_internal_key(input: Ref_wally_psbt_input, pub_key: Buffer|Uint8Array): void;
 export function psbt_input_set_taproot_signature(input: Ref_wally_psbt_input, tap_sig: Buffer|Uint8Array): void;
 export function psbt_input_set_unknowns(input: Ref_wally_psbt_input, map_in: Ref_wally_map): void;
 export function psbt_input_set_utxo(input: Ref_wally_psbt_input, utxo: Ref_wally_tx): void;
@@ -521,6 +523,7 @@ export function psbt_set_input_required_locktime(psbt: Ref_wally_psbt, index: nu
 export function psbt_set_input_sequence(psbt: Ref_wally_psbt, index: number, sequence: number): void;
 export function psbt_set_input_sighash(psbt: Ref_wally_psbt, index: number, sighash: number): void;
 export function psbt_set_input_signatures(psbt: Ref_wally_psbt, index: number, map_in: Ref_wally_map): void;
+export function psbt_set_input_taproot_internal_key(psbt: Ref_wally_psbt, index: number, pub_key: Buffer|Uint8Array): void;
 export function psbt_set_input_taproot_signature(psbt: Ref_wally_psbt, index: number, sig: Buffer|Uint8Array): void;
 export function psbt_set_input_unknowns(psbt: Ref_wally_psbt, index: number, map_in: Ref_wally_map): void;
 export function psbt_set_input_utxo(psbt: Ref_wally_psbt, index: number, utxo: Ref_wally_tx): void;
@@ -774,6 +777,7 @@ export function psbt_get_input_redeem_script(psbt: Ref_wally_psbt, index: number
 export function psbt_get_input_scriptcode(psbt: Ref_wally_psbt, index: number, script: Buffer|Uint8Array): Buffer;
 export function psbt_get_input_signature(psbt: Ref_wally_psbt, index: number, subindex: number): Buffer;
 export function psbt_get_input_signing_script(psbt: Ref_wally_psbt, index: number): Buffer;
+export function psbt_get_input_taproot_internal_key(psbt: Ref_wally_psbt, index: number): Buffer;
 export function psbt_get_input_taproot_signature(psbt: Ref_wally_psbt, index: number): Buffer;
 export function psbt_get_input_unknown(psbt: Ref_wally_psbt, index: number, subindex: number): Buffer;
 export function psbt_get_input_utxo_rangeproof(psbt: Ref_wally_psbt, index: number): Buffer;