Merge rust-bitcoin/rust-bitcoin#990: Derive Hash on a bunch of types

ef7fef0 Derive Hash on a bunch of types (Tobin C. Harding)

Pull request description:

  In preparation for being able to derive `Hash` on all types in `miniscript`, derive `Hash` on all of the required types.

  This PR includes all the changes in https://github.com/rust-bitcoin/rust-bitcoin/pull/933/files and hence supersedes it.

  ref: rust-bitcoin/rust-miniscript#226

ACKs for top commit:
  Kixunil:
    ACK ef7fef0
  apoelstra:
    ACK ef7fef0

Tree-SHA512: 1a1db8b4df2ea8f9e176434bb6fdee5b96f47dcdc6395ebc59e5f5ac5eb13a66fb61e1d90cdbbf12a027f7685fdff21060338c5f27b9d9bf5e9fee452c7c7e83

Author: apoelstra

src/blockdata/transaction.rs

@@ -852,7 +852,7 @@ pub type SigHashType = EcdsaSighashType;
 ///
 /// Fixed values so they can be cast as integer types for encoding (see also
 /// [`SchnorrSighashType`]).
-#[derive(PartialEq, Eq, Debug, Copy, Clone)]
+#[derive(PartialEq, Eq, Debug, Copy, Clone, Hash)]
 pub enum EcdsaSighashType {
     /// 0x1: Sign all outputs.
     All		= 0x01,

src/util/ecdsa.rs

@@ -14,7 +14,7 @@ use secp256k1;
 use crate::EcdsaSighashType;
 
 /// An ECDSA signature with the corresponding hash type.
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
 pub struct EcdsaSig {

src/util/psbt/map/input.rs

@@ -68,7 +68,7 @@ const PSBT_IN_PROPRIETARY: u8 = 0xFC;
 
 /// A key-value map for an input of the corresponding index in the unsigned
 /// transaction.
-#[derive(Clone, Default, Debug, PartialEq, Eq)]
+#[derive(Clone, Default, Debug, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
 pub struct Input {

src/util/psbt/map/output.rs

@@ -36,7 +36,7 @@ const PSBT_OUT_PROPRIETARY: u8 = 0xFC;
 
 /// A key-value map for an output of the corresponding index in the unsigned
 /// transaction.
-#[derive(Clone, Default, Debug, PartialEq, Eq)]
+#[derive(Clone, Default, Debug, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
 pub struct Output {
@@ -123,6 +123,12 @@ impl PartialEq for TapTree {
     }
 }
 
+impl core::hash::Hash for TapTree {
+    fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
+        self.node_info().hash(state)
+    }
+}
+
 impl Eq for TapTree {}
 
 impl From<TapTree> for TaprootBuilder {

src/util/psbt/mod.rs

@@ -37,7 +37,7 @@ use crate::util::bip32::{ExtendedPubKey, KeySource};
 pub type Psbt = PartiallySignedTransaction;
 
 /// A Partially Signed Transaction.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
 pub struct PartiallySignedTransaction {

src/util/schnorr.rs

@@ -205,7 +205,7 @@ impl From<TweakedKeyPair> for crate::KeyPair {
 }
 
 /// A BIP340-341 serialized schnorr signature with the corresponding hash type.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(crate = "actual_serde"))]
 pub struct SchnorrSig {