protocol: move commitment key to open_channel message.

And rename final to final_key to be clearer.

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

anchor.c

@@ -56,8 +56,8 @@ struct bitcoin_tx *anchor_tx_create(const tal_t *ctx,
 		return tal_free(tx);
 
 	/* Pubkeys both valid, right? */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &key1)
-	    || !proto_to_pubkey(o2->anchor->pubkey, &key2))
+	if (!proto_to_pubkey(o1->commit_key, &key1)
+	    || !proto_to_pubkey(o2->commit_key, &key2))
 		return tal_free(tx);
 
 	/* Make the 2 of 2 payment for the commitment txs. */

close_tx.c

@@ -29,9 +29,9 @@ struct bitcoin_tx *create_close_tx(const tal_t *ctx,
 	tx->input[0].input_amount = input_amount;
 
 	/* Outputs goes to final pubkey */
-	if (!proto_to_pubkey(ours->final, &ourkey))
+	if (!proto_to_pubkey(ours->final_key, &ourkey))
 		return tal_free(tx);
-	if (!proto_to_pubkey(theirs->final, &theirkey))
+	if (!proto_to_pubkey(theirs->final_key, &theirkey))
 		return tal_free(tx);
 
 	/* delta must make sense. */

commit_tx.c

@@ -32,9 +32,9 @@ struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
 	tx->input[0].input_amount = ours->anchor->total + theirs->anchor->total;
 
 	/* Output goes to our final pubkeys */
-	if (!proto_to_pubkey(ours->final, &ourkey))
+	if (!proto_to_pubkey(ours->final_key, &ourkey))
 		return tal_free(tx);
-	if (!proto_to_pubkey(theirs->final, &theirkey))
+	if (!proto_to_pubkey(theirs->final_key, &theirkey))
 		return tal_free(tx);
 
 	if (!proto_to_locktime(theirs, &locktime))
@@ -57,7 +57,7 @@ struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
 	tx->output[0].amount += delta;
 	
 	/* Second output is a P2SH payment to them. */
-	if (!proto_to_pubkey(theirs->final, &to_me))
+	if (!proto_to_pubkey(theirs->final_key, &to_me))
 		return tal_free(tx);
 	tx->output[1].script = scriptpubkey_p2sh(ctx,
 						 bitcoin_redeem_single(ctx,

lightning.pb-c.c

@@ -1153,7 +1153,7 @@ const ProtobufCMessageDescriptor change__descriptor =
   (ProtobufCMessageInit) change__init,
   NULL,NULL,NULL    /* reserved[123] */
 };
-static const ProtobufCFieldDescriptor anchor__field_descriptors[6] =
+static const ProtobufCFieldDescriptor anchor__field_descriptors[5] =
 {
   {
     "inputs",
@@ -1191,18 +1191,6 @@ static const ProtobufCFieldDescriptor anchor__field_descriptors[6] =
     0,             /* flags */
     0,NULL,NULL    /* reserved1,reserved2, etc */
   },
-  {
-    "pubkey",
-    5,
-    PROTOBUF_C_LABEL_REQUIRED,
-    PROTOBUF_C_TYPE_MESSAGE,
-    0,   /* quantifier_offset */
-    offsetof(Anchor, pubkey),
-    &bitcoin_pubkey__descriptor,
-    NULL,
-    0,             /* flags */
-    0,NULL,NULL    /* reserved1,reserved2, etc */
-  },
   {
     "fee",
     8,
@@ -1230,19 +1218,18 @@ static const ProtobufCFieldDescriptor anchor__field_descriptors[6] =
 };
 static const unsigned anchor__field_indices_by_name[] = {
   1,   /* field[1] = change */
-  4,   /* field[4] = fee */
+  3,   /* field[3] = fee */
   0,   /* field[0] = inputs */
-  5,   /* field[5] = min_confirms */
-  3,   /* field[3] = pubkey */
+  4,   /* field[4] = min_confirms */
   2,   /* field[2] = total */
 };
 static const ProtobufCIntRange anchor__number_ranges[4 + 1] =
 {
   { 1, 0 },
   { 4, 2 },
-  { 8, 4 },
-  { 10, 5 },
-  { 0, 6 }
+  { 8, 3 },
+  { 10, 4 },
+  { 0, 5 }
 };
 const ProtobufCMessageDescriptor anchor__descriptor =
 {
@@ -1252,15 +1239,27 @@ const ProtobufCMessageDescriptor anchor__descriptor =
   "Anchor",
   "",
   sizeof(Anchor),
-  6,
+  5,
   anchor__field_descriptors,
   anchor__field_indices_by_name,
   4,  anchor__number_ranges,
   (ProtobufCMessageInit) anchor__init,
   NULL,NULL,NULL    /* reserved[123] */
 };
-static const ProtobufCFieldDescriptor open_channel__field_descriptors[6] =
+static const ProtobufCFieldDescriptor open_channel__field_descriptors[7] =
 {
+  {
+    "final_key",
+    1,
+    PROTOBUF_C_LABEL_REQUIRED,
+    PROTOBUF_C_TYPE_MESSAGE,
+    0,   /* quantifier_offset */
+    offsetof(OpenChannel, final_key),
+    &bitcoin_pubkey__descriptor,
+    NULL,
+    0,             /* flags */
+    0,NULL,NULL    /* reserved1,reserved2, etc */
+  },
   {
     "locktime_seconds",
     2,
@@ -1298,12 +1297,12 @@ static const ProtobufCFieldDescriptor open_channel__field_descriptors[6] =
     0,NULL,NULL    /* reserved1,reserved2, etc */
   },
   {
-    "final",
+    "commit_key",
     5,
     PROTOBUF_C_LABEL_REQUIRED,
     PROTOBUF_C_TYPE_MESSAGE,
     0,   /* quantifier_offset */
-    offsetof(OpenChannel, final),
+    offsetof(OpenChannel, commit_key),
     &bitcoin_pubkey__descriptor,
     NULL,
     0,             /* flags */
@@ -1335,17 +1334,18 @@ static const ProtobufCFieldDescriptor open_channel__field_descriptors[6] =
   },
 };
 static const unsigned open_channel__field_indices_by_name[] = {
-  5,   /* field[5] = anchor */
-  4,   /* field[4] = commitment_fee */
-  3,   /* field[3] = final */
-  1,   /* field[1] = locktime_blocks */
-  0,   /* field[0] = locktime_seconds */
-  2,   /* field[2] = revocation_hash */
+  6,   /* field[6] = anchor */
+  4,   /* field[4] = commit_key */
+  5,   /* field[5] = commitment_fee */
+  0,   /* field[0] = final_key */
+  2,   /* field[2] = locktime_blocks */
+  1,   /* field[1] = locktime_seconds */
+  3,   /* field[3] = revocation_hash */
 };
 static const ProtobufCIntRange open_channel__number_ranges[1 + 1] =
 {
-  { 2, 0 },
-  { 0, 6 }
+  { 1, 0 },
+  { 0, 7 }
 };
 const ProtobufCMessageDescriptor open_channel__descriptor =
 {
@@ -1355,7 +1355,7 @@ const ProtobufCMessageDescriptor open_channel__descriptor =
   "OpenChannel",
   "",
   sizeof(OpenChannel),
-  6,
+  7,
   open_channel__field_descriptors,
   open_channel__field_indices_by_name,
   1,  open_channel__number_ranges,

lightning.pb-c.h

@@ -142,10 +142,6 @@ struct  _Anchor
    */
   size_t n_inputs;
   BitcoinInput **inputs;
-  /*
-   * Pubkey for anchor to pay to for commitment tx (p2sh)
-   */
-  BitcoinPubkey *pubkey;
   /*
    * Any change from anchor (in case we don't want to use them all)
    */
@@ -165,7 +161,7 @@ struct  _Anchor
 };
 #define ANCHOR__INIT \
  { PROTOBUF_C_MESSAGE_INIT (&anchor__descriptor) \
-    , 0,NULL, NULL, NULL, 0, 0, 0 }
+    , 0,NULL, NULL, 0, 0, 0 }
 
 
 typedef enum {
@@ -184,10 +180,14 @@ struct  _OpenChannel
    * Hash seed for revoking commitment transactions.
    */
   Sha256Hash *revocation_hash;
+  /*
+   * Pubkey for anchor to pay to for commitment tx (p2sh)
+   */
+  BitcoinPubkey *commit_key;
   /*
    * How to pay money to us from commit_tx.
    */
-  BitcoinPubkey *final;
+  BitcoinPubkey *final_key;
   /*
    * How much transaction fee we'll pay for commitment txs.
    */
@@ -204,7 +204,7 @@ struct  _OpenChannel
 };
 #define OPEN_CHANNEL__INIT \
  { PROTOBUF_C_MESSAGE_INIT (&open_channel__descriptor) \
-    , NULL, NULL, 0, NULL, OPEN_CHANNEL__LOCKTIME__NOT_SET, {} }
+    , NULL, NULL, NULL, 0, NULL, OPEN_CHANNEL__LOCKTIME__NOT_SET, {} }
 
 
 /*

lightning.proto

@@ -52,8 +52,6 @@ message change {
 message anchor {
   // 0 or more unspent inputs we want to use for anchor.
   repeated bitcoin_input inputs = 1;
-  // Pubkey for anchor to pay to for commitment tx (p2sh)
-  required bitcoin_pubkey pubkey = 5;
   // Any change from anchor (in case we don't want to use them all)
   optional change change = 2;
   // How much transaction fee we'll pay in the anchor tx.
@@ -77,8 +75,10 @@ message open_channel {
   }
   // Hash seed for revoking commitment transactions.
   required sha256_hash revocation_hash = 4;
+  // Pubkey for anchor to pay into commitment tx.
+  required bitcoin_pubkey commit_key = 5;
   // How to pay money to us from commit_tx.
-  required bitcoin_pubkey final = 5;
+  required bitcoin_pubkey final_key = 1;
   // How much transaction fee we'll pay for commitment txs.
   required uint64 commitment_fee = 6;
   // The anchor transaction details.

pkt.c

@@ -33,7 +33,8 @@ static struct pkt *to_pkt(const tal_t *ctx, Pkt__PktCase type, void *msg)
 
 struct pkt *openchannel_pkt(const tal_t *ctx,
 			    const struct sha256 *revocation_hash,
-			    const struct pubkey *to_me,
+			    const struct pubkey *commit,
+			    const struct pubkey *final,
 			    u64 commitment_fee,
 			    u32 rel_locktime_seconds,
 			    Anchor *anchor)
@@ -42,10 +43,10 @@ struct pkt *openchannel_pkt(const tal_t *ctx,
 
 	/* Required fields must be set: pack functions don't check! */
 	assert(anchor->inputs);
-	assert(anchor->pubkey);
 
 	o.revocation_hash = sha256_to_proto(ctx, revocation_hash);
-	o.final = pubkey_to_proto(ctx, to_me);
+	o.commit_key = pubkey_to_proto(ctx, commit);
+	o.final_key = pubkey_to_proto(ctx, final);
 	o.commitment_fee = commitment_fee;
 	o.anchor = anchor;
 	o.locktime_case = OPEN_CHANNEL__LOCKTIME_LOCKTIME_SECONDS;

pkt.h

@@ -32,14 +32,16 @@ struct pubkey;
  * openchannel_pkt - create an openchannel message
  * @ctx: tal context to allocate off.
  * @revocation_hash: first hash value generated from seed.
- * @to_me: the pubkey for the commit transactions' P2SH output.
+ * @commit: the pubkey for the anchor transactions' P2SH output.
+ * @final: the pubkey for the commit transactions' P2SH output.
  * @commitment_fee: the fee to use for commitment tx.
  * @rel_locktime_seconds: relative seconds for commitment locktime.
  * @anchor: the anchor transaction details.
  */
 struct pkt *openchannel_pkt(const tal_t *ctx,
 			    const struct sha256 *revocation_hash,
-			    const struct pubkey *to_me,
+			    const struct pubkey *commit,
+			    const struct pubkey *final,
 			    u64 commitment_fee,
 			    u32 rel_locktime_seconds,
 			    Anchor *anchor);

test-cli/check-commit-sig.c

@@ -54,8 +54,8 @@ int main(int argc, char *argv[])
 		errx(1, "Private key '%s' not on testnet!", argv[4]);
 
 	/* Pubkey well-formed? */
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid anchor-2 key");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit_key");
 
 	/* Get the transaction ID of the anchor. */
 	anchor = anchor_tx_create(ctx, o1, o2, &inmap, &outmap);

test-cli/close-channel.c

@@ -68,13 +68,13 @@ int main(int argc, char *argv[])
 	}
 
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey2))
+	if (!proto_to_pubkey(o1->commit_key, &pubkey2))
 		errx(1, "Invalid o1 commit pubkey");
 	if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
 	    || memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
 		errx(1, "o1 pubkey != this privkey");
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid o2 final pubkey");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit pubkey");
 
 	/* This is what the anchor pays to; figure out whick output. */
 	redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);

test-cli/create-close-tx.c

@@ -53,10 +53,10 @@ int main(int argc, char *argv[])
 	bitcoin_txid(anchor, &anchor_txid);
 
 	/* Pubkeys well-formed? */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey1))
-		errx(1, "Invalid anchor-1 key");
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid anchor-2 key");
+	if (!proto_to_pubkey(o1->commit_key, &pubkey1))
+		errx(1, "Invalid o1 commit_key");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit_key");
 	
 	/* Get delta by accumulting all the updates. */
 	delta = 0;

test-cli/create-commit-spend-tx.c

@@ -70,12 +70,12 @@ int main(int argc, char *argv[])
 		errx(1, "Invalid bitcoin pubkey '%s'", argv[5]);
 
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->final, &pubkey2))
+	if (!proto_to_pubkey(o1->final_key, &pubkey2))
 		errx(1, "Invalid o1 final pubkey");
 	if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
 	    || memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
 		errx(1, "o1 pubkey != this privkey");
-	if (!proto_to_pubkey(o2->final, &pubkey2))
+	if (!proto_to_pubkey(o2->final_key, &pubkey2))
 		errx(1, "Invalid o2 final pubkey");
 
 	/* o1 gives us the revocation hash */

test-cli/create-commit-tx.c

@@ -58,13 +58,13 @@ int main(int argc, char *argv[])
 		errx(1, "Private key '%s' not on testnet!", argv[4]);
 
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid o1 anchor pubkey");
+	if (!proto_to_pubkey(o1->commit_key, &pubkey2))
+		errx(1, "Invalid o1 commit pubkey");
 	if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
 	    || memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
 		errx(1, "o1 pubkey != this privkey");
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid o2 anchor pubkey");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit pubkey");
 
 	/* Their signature comes from open-commit or from update-accept. */
 	sig2.stype = SIGHASH_ALL;

test-cli/create-steal-tx.c

@@ -74,12 +74,12 @@ int main(int argc, char *argv[])
 		errx(1, "Invalid bitcoin pubkey '%s'", argv[6]);
 
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->final, &pubkey2))
+	if (!proto_to_pubkey(o1->final_key, &pubkey2))
 		errx(1, "Invalid o1 final pubkey");
 	if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
 	    || memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
 		errx(1, "o1 pubkey != this privkey");
-	if (!proto_to_pubkey(o2->final, &pubkey2))
+	if (!proto_to_pubkey(o2->final_key, &pubkey2))
 		errx(1, "Invalid o2 final pubkey");
 
 	/* Now, which commit output?  Match redeem script. */

test-cli/open-channel.c

@@ -132,7 +132,6 @@ int main(int argc, char *argv[])
 	
 	anchor.n_inputs = (argc - 6);
 	anchor.inputs = tal_arr(ctx, BitcoinInput *, anchor.n_inputs);
-	anchor.pubkey = pubkey_to_proto(ctx, &commitkey);
 
 	total_in = 0;
 	for (i = 0; i < anchor.n_inputs; i++) {
@@ -160,7 +159,7 @@ int main(int argc, char *argv[])
 	sha256(&revocation_hash,
 	       revocation_hash.u.u8, sizeof(revocation_hash.u.u8));
 
-	pkt = openchannel_pkt(ctx, &revocation_hash, &outkey,
+	pkt = openchannel_pkt(ctx, &revocation_hash, &commitkey, &outkey,
 			      commit_tx_fee, locktime_seconds, &anchor);
 
 	if (!write_all(STDOUT_FILENO, pkt, pkt_totlen(pkt)))

test-cli/open-commit-sig.c

@@ -74,7 +74,7 @@ int main(int argc, char *argv[])
 		     (long long)o2->commitment_fee);
 
 	/* Their pubkey must be valid */
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
 		errx(1, "Invalid public open-channel-file2");
 
 	/* Sign it for them. */

test-cli/update-channel-accept.c

@@ -76,13 +76,13 @@ int main(int argc, char *argv[])
 	       revocation_hash.u.u8, sizeof(revocation_hash.u.u8));
 	
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey2))
+	if (!proto_to_pubkey(o1->commit_key, &pubkey2))
 		errx(1, "Invalid o1 commit pubkey");
 	if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
 	    || memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
 		errx(1, "o1 pubkey != this privkey");
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid o2 final pubkey");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit pubkey");
 
 	/* This is what the anchor pays to; figure out whick output. */
 	redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);

test-cli/update-channel-complete.c

@@ -89,10 +89,10 @@ int main(int argc, char *argv[])
 		errx(1, "Their preimage was incorrect");
 
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey1))
+	if (!proto_to_pubkey(o1->commit_key, &pubkey1))
 		errx(1, "Invalid o1 commit pubkey");
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid o2 final pubkey");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit pubkey");
 
 	/* This is what the anchor pays to; figure out whick output. */
 	redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);

test-cli/update-channel-signature.c

@@ -80,13 +80,13 @@ int main(int argc, char *argv[])
 	shachain_from_seed(&seed, argc - 7 - 1, &preimage);
 	
 	/* Get pubkeys */
-	if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey2))
+	if (!proto_to_pubkey(o1->commit_key, &pubkey2))
 		errx(1, "Invalid o1 commit pubkey");
 	if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
 	    || memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
 		errx(1, "o1 pubkey != this privkey");
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
-		errx(1, "Invalid o2 final pubkey");
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
+		errx(1, "Invalid o2 commit pubkey");
 
 	/* This is what the anchor pays to; figure out whick output. */
 	redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
@@ -115,7 +115,7 @@ int main(int argc, char *argv[])
 		errx(1, "Delta too large");
 
 	/* Their pubkey must be valid */
-	if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
+	if (!proto_to_pubkey(o2->commit_key, &pubkey2))
 		errx(1, "Invalid public open-channel-file2");
 
 	/* Sign it for them. */