bitcoin/pubkey: add pubkey32 primitive for xonly pubkey types.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

bitcoin/pubkey.c

@@ -125,3 +125,37 @@ void towire_pubkey(u8 **pptr, const struct pubkey *pubkey)
 
 	towire(pptr, output, outputlen);
 }
+
+void fromwire_pubkey32(const u8 **cursor, size_t *max, struct pubkey32 *pubkey32)
+{
+	u8 raw[32];
+
+	if (!fromwire(cursor, max, raw, sizeof(raw)))
+		return;
+
+	if (secp256k1_xonly_pubkey_parse(secp256k1_ctx,
+					 &pubkey32->pubkey,
+					 raw) != 1) {
+		SUPERVERBOSE("not a valid point");
+		fromwire_fail(cursor, max);
+	}
+}
+
+void towire_pubkey32(u8 **pptr, const struct pubkey32 *pubkey32)
+{
+	u8 output[32];
+
+	secp256k1_xonly_pubkey_serialize(secp256k1_ctx, output,
+					 &pubkey32->pubkey);
+	towire(pptr, output, sizeof(output));
+}
+
+char *pubkey32_to_hexstr(const tal_t *ctx, const struct pubkey32 *pubkey32)
+{
+	u8 output[32];
+
+	secp256k1_xonly_pubkey_serialize(secp256k1_ctx, output,
+					 &pubkey32->pubkey);
+	return tal_hexstr(ctx, output, sizeof(output));
+}
+REGISTER_TYPE_TO_STRING(pubkey32, pubkey32_to_hexstr);

bitcoin/pubkey.h

@@ -7,6 +7,7 @@
 #include <ccan/structeq/structeq.h>
 #include <ccan/tal/tal.h>
 #include <secp256k1.h>
+#include <secp256k1_extrakeys.h>
 
 struct privkey;
 struct secret;
@@ -20,6 +21,13 @@ struct pubkey {
 /* Define pubkey_eq (no padding) */
 STRUCTEQ_DEF(pubkey, 0, pubkey.data);
 
+struct pubkey32 {
+	/* Unpacked pubkey (as used by libsecp256k1 internally) */
+	secp256k1_xonly_pubkey pubkey;
+};
+/* Define pubkey_eq (no padding) */
+STRUCTEQ_DEF(pubkey32, 0, pubkey.data);
+
 /* Convert from hex string of DER (scriptPubKey from validateaddress) */
 bool pubkey_from_hexstr(const char *derstr, size_t derlen, struct pubkey *key);
 
@@ -60,4 +68,9 @@ void pubkey_to_hash160(const struct pubkey *pk, struct ripemd160 *hash);
 void towire_pubkey(u8 **pptr, const struct pubkey *pubkey);
 void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey);
 
+/* marshal/unmarshal functions */
+void towire_pubkey32(u8 **pptr, const struct pubkey32 *pubkey);
+void fromwire_pubkey32(const u8 **cursor, size_t *max, struct pubkey32 *pubkey);
+
+char *pubkey32_to_hexstr(const tal_t *ctx, const struct pubkey32 *pubkey32);
 #endif /* LIGHTNING_BITCOIN_PUBKEY_H */

bitcoin/signature.c

@@ -348,3 +348,15 @@ void towire_bitcoin_signature(u8 **pptr, const struct bitcoin_signature *sig)
 	towire_secp256k1_ecdsa_signature(pptr, &sig->s);
 	towire_u8(pptr, sig->sighash_type);
 }
+
+void towire_bip340sig(u8 **pptr, const struct bip340sig *bip340sig)
+{
+	towire_u8_array(pptr, bip340sig->u8, sizeof(bip340sig->u8));
+}
+
+void fromwire_bip340sig(const u8 **cursor, size_t *max,
+			struct bip340sig *bip340sig)
+{
+	fromwire_u8_array(cursor, max, bip340sig->u8, sizeof(bip340sig->u8));
+}
+REGISTER_TYPE_TO_HEXSTR(bip340sig);

bitcoin/signature.h

@@ -131,4 +131,11 @@ void towire_bitcoin_signature(u8 **pptr, const struct bitcoin_signature *sig);
 void fromwire_bitcoin_signature(const u8 **cursor, size_t *max,
 				struct bitcoin_signature *sig);
 
+/* Schnorr */
+struct bip340sig {
+	u8 u8[64];
+};
+void towire_bip340sig(u8 **pptr, const struct bip340sig *bip340sig);
+void fromwire_bip340sig(const u8 **cursor, size_t *max,
+			struct bip340sig *bip340sig);
 #endif /* LIGHTNING_BITCOIN_SIGNATURE_H */

common/node_id.c

@@ -25,6 +25,16 @@ bool pubkey_from_node_id(struct pubkey *key, const struct node_id *id)
 					 sizeof(id->k));
 }
 
+WARN_UNUSED_RESULT
+bool pubkey32_from_node_id(struct pubkey32 *key, const struct node_id *id)
+{
+	struct pubkey k;
+	if (!pubkey_from_node_id(&k, id))
+		return false;
+	return secp256k1_xonly_pubkey_from_pubkey(secp256k1_ctx, &key->pubkey,
+						  NULL, &k.pubkey) == 1;
+}
+
 /* It's valid if we can convert to a real pubkey. */
 bool node_id_valid(const struct node_id *id)
 {

common/node_id.h

@@ -24,6 +24,10 @@ void node_id_from_pubkey(struct node_id *id, const struct pubkey *key);
 WARN_UNUSED_RESULT
 bool pubkey_from_node_id(struct pubkey *key, const struct node_id *id);
 
+/* Returns false if not a valid pubkey: relatively expensive */
+WARN_UNUSED_RESULT
+bool pubkey32_from_node_id(struct pubkey32 *key, const struct node_id *id);
+
 /* Convert to hex string of SEC1 encoding. */
 char *node_id_to_hexstr(const tal_t *ctx, const struct node_id *id);
 

common/test/exp-run-psbt_diff.c

@@ -42,6 +42,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for pseudorand_u64 */
 uint64_t pseudorand_u64(void)
 { fprintf(stderr, "pseudorand_u64 called!\n"); abort(); }

common/test/run-amount.c

@@ -37,6 +37,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/test/run-bigsize.c

@@ -80,6 +80,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for json_add_member */
 void json_add_member(struct json_stream *js UNNEEDED,
 		     const char *fieldname UNNEEDED,

common/test/run-cryptomsg.c

@@ -75,6 +75,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/test/run-derive_basepoints.c

@@ -76,6 +76,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/test/run-features.c

@@ -75,6 +75,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/test/run-gossmap-fp16.c

@@ -68,6 +68,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for siphash_seed */
 const struct siphash_seed *siphash_seed(void)
 { fprintf(stderr, "siphash_seed called!\n"); abort(); }

common/test/run-json_remove.c

@@ -72,6 +72,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for json_add_member */
 void json_add_member(struct json_stream *js UNNEEDED,
 		     const char *fieldname UNNEEDED,

common/test/run-key_derive.c

@@ -77,6 +77,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/test/run-lock.c

@@ -76,6 +76,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/test/run-softref.c

@@ -73,6 +73,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

common/type_to_string.h

@@ -9,6 +9,7 @@
 /* This must match the type_to_string_ cases. */
 union printable_types {
 	const struct pubkey *pubkey;
+	const struct pubkey32 *pubkey32;
 	const struct node_id *node_id;
 	const struct bitcoin_txid *bitcoin_txid;
 	const struct bitcoin_blkid *bitcoin_blkid;
@@ -31,6 +32,7 @@ union printable_types {
 	const struct privkey *privkey;
 	const secp256k1_ecdsa_signature *secp256k1_ecdsa_signature;
 	const struct bitcoin_signature *bitcoin_signature;
+	const struct bip340sig *bip340sig;
 	const struct channel *channel;
 	const struct amount_msat *amount_msat;
 	const struct amount_sat *amount_sat;

connectd/test/run-initiator-success.c

@@ -79,6 +79,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

connectd/test/run-responder-success.c

@@ -79,6 +79,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for towire */
 void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
 { fprintf(stderr, "towire called!\n"); abort(); }

external/Makefile

@@ -71,7 +71,7 @@ $(TARGET_DIR)/libsecp256k1.% $(TARGET_DIR)/libwallycore.%: $(TARGET_DIR)/libwall
 $(TARGET_DIR)/libwally-core-build/src/libwallycore.% $(TARGET_DIR)/libwally-core-build/src/secp256k1/libsecp256k1.%: $(LIBWALLY_HEADERS) $(LIBSECP_HEADERS)
 	cd external/libwally-core && ./tools/autogen.sh
 	mkdir -p ${TARGET_DIR}/libwally-core-build
-	cd ${TARGET_DIR}/libwally-core-build && CFLAGS=-std=c99 ${TOP}/libwally-core/configure CC="$(CC)" --enable-static=yes $(CROSSCOMPILE_OPTS) --enable-module-recovery --enable-elements --enable-shared=no --prefix=/ --libdir=/ --enable-debug && $(MAKE)
+	cd ${TARGET_DIR}/libwally-core-build && CFLAGS=-std=c99 ${TOP}/libwally-core/configure CC="$(CC)" --enable-static=yes $(CROSSCOMPILE_OPTS) --enable-module-recovery --enable-module-extrakeys --enable-module-schnorrsig --enable-elements --enable-shared=no --prefix=/ --libdir=/ --enable-debug && $(MAKE)
 
 # If we tell Make that the above builds both, it runs it twice in
 # parallel.  So we lie :(

onchaind/test/run-grind_feerate-bug.c

@@ -84,6 +84,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for htlc_offered_wscript */
 u8 *htlc_offered_wscript(const tal_t *ctx UNNEEDED,
 			 const struct ripemd160 *ripemd UNNEEDED,

onchaind/test/run-grind_feerate.c

@@ -85,6 +85,9 @@ u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 /* Generated stub for fromwire_u8 */
 u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
 { fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
+/* Generated stub for fromwire_u8_array */
+void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
+{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
 /* Generated stub for htlc_offered_wscript */
 u8 *htlc_offered_wscript(const tal_t *ctx UNNEEDED,
 			 const struct ripemd160 *ripemd UNNEEDED,