Move bitcoin stuff into bitcoin subdir.

It's not very interesting if you're looking for LN code.

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

bitcoin/script.h

@@ -0,0 +1,69 @@
+#ifndef LIGHTNING_BITCOIN_SCRIPT_H
+#define LIGHTNING_BITCOIN_SCRIPT_H
+#include <ccan/short_types/short_types.h>
+#include <ccan/tal/tal.h>
+#include "signature.h"
+
+struct bitcoin_address;
+struct pubkey;
+struct sha256;
+
+/* A bitcoin signature includes one byte for the type. */
+struct bitcoin_signature {
+	struct signature sig;
+	enum sighash_type stype;
+};
+
+/* tal_count() gives the length of the script. */
+u8 *bitcoin_redeem_2of2(const tal_t *ctx,
+			const struct pubkey *key1,
+			const struct pubkey *key2);
+
+/* tal_count() gives the length of the script. */
+u8 *bitcoin_redeem_single(const tal_t *ctx, const struct pubkey *key);
+
+/* One of:
+ * mysig and theirsig, OR
+ * mysig and relative locktime passed, OR
+ * theirsig and hash preimage. */
+u8 *bitcoin_redeem_revocable(const tal_t *ctx,
+			     const struct pubkey *mykey,
+			     u32 locktime,
+			     const struct pubkey *theirkey,
+			     const struct sha256 *revocation_hash);
+
+/* Create an output script using p2sh for this redeem script. */
+u8 *scriptpubkey_p2sh(const tal_t *ctx, const u8 *redeemscript);
+
+/* Create an input script to accept pay to pubkey */
+u8 *scriptsig_pay_to_pubkeyhash(const tal_t *ctx,
+				const struct pubkey *key,
+				const struct bitcoin_signature *sig);
+
+/* Create an input script to accept pay to pubkey */
+u8 *scriptsig_p2sh_2of2(const tal_t *ctx,
+			const struct bitcoin_signature *sig1,
+			const struct bitcoin_signature *sig2,
+			const struct pubkey *key1,
+			const struct pubkey *key2);
+
+/* Create an input script to solve by revokehash */
+u8 *scriptsig_p2sh_revoke(const tal_t *ctx,
+			  const struct sha256 *preimage,
+			  const struct bitcoin_signature *sig,
+			  const u8 *revocable_redeem,
+			  size_t redeem_len);
+
+/* Create an input script which pushes sigs then redeem script. */
+u8 *scriptsig_p2sh_single_sig(const tal_t *ctx,
+			      const u8 *redeem_script,
+			      size_t redeem_len,
+			      const struct bitcoin_signature *sig);
+
+/* Is this a normal pay to pubkey hash? */
+bool is_pay_to_pubkey_hash(const u8 *script, size_t script_len);
+
+/* Is this a pay to script hash? */
+bool is_p2sh(const u8 *script, size_t script_len);
+
+#endif /* LIGHTNING_BITCOIN_SCRIPT_H */