script: Move some inspector methods from ScriptBuf to Script

bitcoin/src/blockdata/script/borrowed.rs

@@ -295,6 +295,26 @@ impl Script {
         }
     }
 
+    /// Computes the P2SH output corresponding to this redeem script.
+    pub fn to_p2sh(&self) -> ScriptBuf { ScriptBuf::new_p2sh(&self.script_hash()) }
+
+    /// Returns the script code used for spending a P2WPKH output if this script is a script pubkey
+    /// for a P2WPKH output. The `scriptCode` is described in [BIP143].
+    ///
+    /// [BIP143]: <https://github.com/bitcoin/bips/blob/99701f68a88ce33b2d0838eb84e115cef505b4c2/bip-0143.mediawiki>
+    pub fn p2wpkh_script_code(&self) -> Option<ScriptBuf> {
+        self.v0_p2wpkh().map(|wpkh| {
+            Builder::new()
+                .push_opcode(OP_DUP)
+                .push_opcode(OP_HASH160)
+                // The `self` script is 0x00, 0x14, <pubkey_hash>
+                .push_slice(wpkh)
+                .push_opcode(OP_EQUALVERIFY)
+                .push_opcode(OP_CHECKSIG)
+                .into_script()
+        })
+    }
+
     /// Returns the minimum value an output with this script should have in order to be
     /// broadcastable on today's Bitcoin network.
     pub fn dust_value(&self) -> crate::Amount {

bitcoin/src/blockdata/script/owned.rs

@@ -172,26 +172,6 @@ impl ScriptBuf {
     /// This method doesn't (re)allocate.
     pub fn into_bytes(self) -> Vec<u8> { self.0 }
 
-    /// Computes the P2SH output corresponding to this redeem script.
-    pub fn to_p2sh(&self) -> ScriptBuf { ScriptBuf::new_p2sh(&self.script_hash()) }
-
-    /// Returns the script code used for spending a P2WPKH output if this script is a script pubkey
-    /// for a P2WPKH output. The `scriptCode` is described in [BIP143].
-    ///
-    /// [BIP143]: <https://github.com/bitcoin/bips/blob/99701f68a88ce33b2d0838eb84e115cef505b4c2/bip-0143.mediawiki>
-    pub fn p2wpkh_script_code(&self) -> Option<ScriptBuf> {
-        self.v0_p2wpkh().map(|wpkh| {
-            Builder::new()
-                .push_opcode(OP_DUP)
-                .push_opcode(OP_HASH160)
-                // The `self` script is 0x00, 0x14, <pubkey_hash>
-                .push_slice(wpkh)
-                .push_opcode(OP_EQUALVERIFY)
-                .push_opcode(OP_CHECKSIG)
-                .into_script()
-        })
-    }
-
     /// Adds a single opcode to the script.
     pub fn push_opcode(&mut self, data: opcodes::All) { self.0.push(data.to_u8()); }
 

bitcoin/src/psbt/mod.rs

@@ -15,7 +15,6 @@ use internals::write_err;
 use secp256k1::{Message, Secp256k1, Signing};
 
 use crate::bip32::{self, ExtendedPrivKey, ExtendedPubKey, KeySource};
-use crate::blockdata::script::ScriptBuf;
 use crate::blockdata::transaction::{Transaction, TxOut};
 use crate::crypto::ecdsa;
 use crate::crypto::key::{PrivateKey, PublicKey};
@@ -336,16 +335,15 @@ impl Psbt {
                 Ok((Message::from(sighash), hash_ty))
             }
             Wpkh => {
-                let script_code = ScriptBuf::p2wpkh_script_code(spk).ok_or(SignError::NotWpkh)?;
+                let script_code = spk.p2wpkh_script_code().ok_or(SignError::NotWpkh)?;
                 let sighash =
                     cache.segwit_signature_hash(input_index, &script_code, utxo.value, hash_ty)?;
                 Ok((Message::from(sighash), hash_ty))
             }
             ShWpkh => {
-                let script_code = ScriptBuf::p2wpkh_script_code(
+                let script_code = input.redeem_script.as_ref().expect("checked above")
-                    input.redeem_script.as_ref().expect("checked above"),
+                    .p2wpkh_script_code()
-                )
+                    .ok_or(SignError::NotWpkh)?;
-                .ok_or(SignError::NotWpkh)?;
                 let sighash =
                     cache.segwit_signature_hash(input_index, &script_code, utxo.value, hash_ty)?;
                 Ok((Message::from(sighash), hash_ty))