Merge pull request #1663 from zcash/pczt-no-std

pczt: Enable the base crate to be no-std compatible

pczt/Cargo.toml

@@ -21,7 +21,7 @@ rand_core = { workspace = true, optional = true }
 # Encoding
 postcard = { version = "1", features = ["alloc"] }
 serde.workspace = true
-serde_with = "3"
+serde_with = { version = "3", default-features = false, features = ["alloc", "macros"] }
 
 # Payment protocols
 # - Transparent

pczt/src/common.rs

@@ -1,4 +1,6 @@
-use std::collections::BTreeMap;
+use alloc::collections::BTreeMap;
+use alloc::string::String;
+use alloc::vec::Vec;
 
 use getset::Getters;
 use serde::{Deserialize, Serialize};
@@ -199,7 +201,7 @@ pub(crate) struct Zip32Derivation {
 
 #[cfg(test)]
 mod tests {
-    use std::collections::BTreeMap;
+    use alloc::collections::BTreeMap;
 
     use super::Global;
 

pczt/src/lib.rs

@@ -41,6 +41,13 @@
 //! - Transaction Extractor (anyone can execute)
 //!   - Creates bindingSig and extracts the final transaction.
 
+#![no_std]
+
+#[macro_use]
+extern crate alloc;
+
+use alloc::vec::Vec;
+
 use getset::Getters;
 use serde::{Deserialize, Serialize};
 

pczt/src/orchard.rs

@@ -1,4 +1,7 @@
-use std::{cmp::Ordering, collections::BTreeMap};
+use alloc::collections::BTreeMap;
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::cmp::Ordering;
 
 #[cfg(feature = "orchard")]
 use ff::PrimeField;

pczt/src/roles/combiner/mod.rs

@@ -1,4 +1,5 @@
-use std::collections::BTreeMap;
+use alloc::collections::BTreeMap;
+use alloc::vec::Vec;
 
 use crate::Pczt;
 

pczt/src/roles/creator/mod.rs

@@ -1,4 +1,4 @@
-use std::collections::BTreeMap;
+use alloc::collections::BTreeMap;
 
 use crate::{
     common::{

pczt/src/roles/signer/mod.rs

@@ -278,7 +278,7 @@ impl Authorization for EffectsOnly {
     type SaplingAuth = sapling::bundle::EffectsOnly;
     type OrchardAuth = orchard::bundle::EffectsOnly;
     #[cfg(zcash_unstable = "zfuture")]
-    type TzeAuth = std::convert::Infallible;
+    type TzeAuth = core::convert::Infallible;
 }
 
 /// Errors that can occur while creating signatures for a PCZT.

pczt/src/roles/tx_extractor/mod.rs

@@ -1,4 +1,4 @@
-use std::marker::PhantomData;
+use core::marker::PhantomData;
 
 use rand_core::OsRng;
 use zcash_primitives::{
@@ -155,7 +155,7 @@ impl Authorization for Unbound {
     type SaplingAuth = ::sapling::pczt::Unbound;
     type OrchardAuth = ::orchard::pczt::Unbound;
     #[cfg(zcash_unstable = "zfuture")]
-    type TzeAuth = std::convert::Infallible;
+    type TzeAuth = core::convert::Infallible;
 }
 
 /// Errors that can occur while extracting a transaction from a PCZT.

pczt/src/roles/updater/mod.rs

@@ -1,3 +1,6 @@
+use alloc::string::String;
+use alloc::vec::Vec;
+
 use crate::{common::Global, Pczt};
 
 #[cfg(feature = "orchard")]

pczt/src/sapling.rs

@@ -1,5 +1,7 @@
-use std::cmp::Ordering;
-use std::collections::BTreeMap;
+use alloc::collections::BTreeMap;
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::cmp::Ordering;
 
 use getset::Getters;
 use serde::{Deserialize, Serialize};

pczt/src/transparent.rs

@@ -1,4 +1,7 @@
-use std::{cmp::Ordering, collections::BTreeMap};
+use alloc::collections::BTreeMap;
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::cmp::Ordering;
 
 use crate::{
     common::{Global, Zip32Derivation},