signature: expose check_signed_hash()

This is wanted for crypto communications to check signature.

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

bitcoin/signature.c

@@ -76,7 +76,7 @@ static void dump_tx(const char *msg,
 }
 #endif
 	
-bool sign_hash(const tal_t *ctx, const struct privkey *privkey,
+bool sign_hash(const struct privkey *privkey,
 	       const struct sha256_double *h,
 	       struct signature *s)
 {
@@ -133,7 +133,7 @@ static void sha256_tx_one_input(struct bitcoin_tx *tx,
 }
 
 /* Only does SIGHASH_ALL */
-bool sign_tx_input(const tal_t *ctx, struct bitcoin_tx *tx,
+bool sign_tx_input(struct bitcoin_tx *tx,
 		   unsigned int in,
 		   const u8 *subscript, size_t subscript_len,
 		   const struct privkey *privkey, const struct pubkey *key,
@@ -143,12 +143,12 @@ bool sign_tx_input(const tal_t *ctx, struct bitcoin_tx *tx,
 
 	sha256_tx_one_input(tx, in, subscript, subscript_len, &hash);
 	dump_tx("Signing", tx, in, subscript, subscript_len, key, &hash);
-	return sign_hash(ctx, privkey, &hash, sig);
+	return sign_hash(privkey, &hash, sig);
 }
 
-static bool check_signed_hash(const struct sha256_double *hash,
-			      const struct signature *signature,
-			      const struct pubkey *key)
+bool check_signed_hash(const struct sha256_double *hash,
+		       const struct signature *signature,
+		       const struct pubkey *key)
 {
 	int ret;
 	secp256k1_context *secpctx;

bitcoin/signature.h

@@ -3,7 +3,7 @@
 #include "config.h"
 #include "secp256k1.h"
 #include <ccan/short_types/short_types.h>
-#include <ccan/tal/tal.h>
+#include <stdbool.h>
 
 enum sighash_type {
     SIGHASH_ALL = 1,
@@ -28,12 +28,16 @@ struct privkey;
 struct bitcoin_tx_output;
 struct bitcoin_signature;
 
-bool sign_hash(const tal_t *ctx, const struct privkey *p,
+bool sign_hash(const struct privkey *p,
 	       const struct sha256_double *h,
 	       struct signature *s);
 
+bool check_signed_hash(const struct sha256_double *hash,
+		       const struct signature *signature,
+		       const struct pubkey *key);
+
 /* All tx input scripts must be set to 0 len. */
-bool sign_tx_input(const tal_t *ctx, struct bitcoin_tx *tx,
+bool sign_tx_input(struct bitcoin_tx *tx,
 		   unsigned int in,
 		   const u8 *subscript, size_t subscript_len,
 		   const struct privkey *privkey, const struct pubkey *pubkey,

test-cli/close-channel.c

@@ -92,7 +92,7 @@ int main(int argc, char *argv[])
 				   cstate->b.pay_msat / 1000);
 
 	/* Sign it for them. */
-	sign_tx_input(ctx, close_tx, 0, redeemscript, tal_count(redeemscript),
+	sign_tx_input(close_tx, 0, redeemscript, tal_count(redeemscript),
 		      &privkey, &pubkey1, &sig);
 
 	if (close_file)

test-cli/create-anchor-tx.c

@@ -163,7 +163,7 @@ int main(int argc, char *argv[])
 	/* Now, sign each input. */
 	for (i = 0; i < tal_count(in); i++) {
 		in[i].sig.stype = SIGHASH_ALL;
-		if (!sign_tx_input(ctx, anchor, i, in[i].in.script,
+		if (!sign_tx_input(anchor, i, in[i].in.script,
 				   in[i].in.script_length,
 				   &in[i].privkey, &in[i].pubkey,
 				   &in[i].sig.sig))

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

@@ -111,7 +111,7 @@ int main(int argc, char *argv[])
 	tx->output[0].script_length = tal_count(tx->output[0].script);
 
 	/* Now get signature, to set up input script. */
-	if (!sign_tx_input(tx, tx, 0, redeemscript, tal_count(redeemscript),
+	if (!sign_tx_input(tx, 0, redeemscript, tal_count(redeemscript),
 			   &privkey, &pubkey1, &sig.sig))
 		errx(1, "Could not sign tx");
 	sig.stype = SIGHASH_ALL;

test-cli/create-commit-tx.c

@@ -81,7 +81,7 @@ int main(int argc, char *argv[])
 
 	/* We generate our signature. */
 	sig1.stype = SIGHASH_ALL;
-	sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
+	sign_tx_input(commit, 0, redeemscript, tal_count(redeemscript),
 		      &privkey, &pubkey1, &sig1.sig);
 
 	/* Check it works with theirs... */

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

@@ -185,7 +185,7 @@ int main(int argc, char *argv[])
 	tx->output[0].script_length = tal_count(tx->output[0].script);
 
 	/* Now get signature, to set up input script. */
-	if (!sign_tx_input(tx, tx, 0, redeemscript, tal_count(redeemscript),
+	if (!sign_tx_input(tx, 0, redeemscript, tal_count(redeemscript),
 			   &privkey, &key, &sig.sig))
 		errx(1, "Could not sign tx");
 

test-cli/create-steal-tx.c

@@ -112,7 +112,7 @@ int main(int argc, char *argv[])
 	tx->output[0].script_length = tal_count(tx->output[0].script);
 
 	/* Now get signature, to set up input script. */
-	if (!sign_tx_input(tx, tx, 0, redeemscript, tal_count(redeemscript),
+	if (!sign_tx_input(tx, 0, redeemscript, tal_count(redeemscript),
 			   &privkey, &pubkey1, &sig.sig))
 		errx(1, "Could not sign tx");
 	sig.stype = SIGHASH_ALL;

test-cli/open-anchor.c

@@ -81,7 +81,7 @@ int main(int argc, char *argv[])
 	invert_cstate(cstate);
  	commit = create_commit_tx(ctx, o2, o1, &oa, &rhash, cstate);
 
-	sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
+	sign_tx_input(commit, 0, redeemscript, tal_count(redeemscript),
 		      &privkey, &pubkey1, &sig);
 
 	oa.commit_sig = signature_to_proto(ctx, &sig);

test-cli/open-commit-sig.c

@@ -75,7 +75,7 @@ int main(int argc, char *argv[])
 
 	/* Sign it for them. */
 	subscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
-	sign_tx_input(ctx, commit, 0, subscript, tal_count(subscript),
+	sign_tx_input(commit, 0, subscript, tal_count(subscript),
 		      &privkey, &pubkey1, &sig);
 
 	pkt = open_commit_sig_pkt(ctx, &sig);

test-cli/update-channel-accept.c

@@ -91,7 +91,7 @@ int main(int argc, char *argv[])
 		errx(1, "Delta too large");
 
 	/* Sign it for them. */
-	sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
+	sign_tx_input(commit, 0, redeemscript, tal_count(redeemscript),
 		      &privkey, &pubkey1, &sig.sig);
 
 	pkt = update_accept_pkt(ctx, &sig.sig, &revocation_hash);

test-cli/update-channel-signature.c

@@ -106,7 +106,7 @@ int main(int argc, char *argv[])
 		errx(1, "Invalid public open-channel-file2");
 
 	/* Sign it for them. */
-	sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
+	sign_tx_input(commit, 0, redeemscript, tal_count(redeemscript),
 		      &privkey, &pubkey1, &sig.sig);
 
 	pkt = update_signature_pkt(ctx, &sig.sig, &preimage);