From ce3830f277fe1c80b98bd38d7f8e5e583051e03e Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@electriccoin.co>
Date: Tue, 5 Dec 2023 18:32:11 +0000
Subject: [PATCH] Make crate no-std

---
 src/fingerprint.rs | 12 ++++++------
 src/lib.rs         |  3 ++-
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/fingerprint.rs b/src/fingerprint.rs
index e6acfeb..060731d 100644
--- a/src/fingerprint.rs
+++ b/src/fingerprint.rs
@@ -47,17 +47,17 @@ impl SeedFingerprint {
 #[test]
 fn test_seed_fingerprint() {
     struct TestVector {
-        root_seed: Vec<u8>,
-        fingerprint: Vec<u8>,
+        root_seed: [u8; 32],
+        fingerprint: [u8; 32],
     }
 
-    let test_vectors = vec![TestVector {
-        root_seed: vec![
+    let test_vectors = [TestVector {
+        root_seed: [
             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
             0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
             0x1c, 0x1d, 0x1e, 0x1f,
         ],
-        fingerprint: vec![
+        fingerprint: [
             0xde, 0xff, 0x60, 0x4c, 0x24, 0x67, 0x10, 0xf7, 0x17, 0x6d, 0xea, 0xd0, 0x2a, 0xa7,
             0x46, 0xf2, 0xfd, 0x8d, 0x53, 0x89, 0xf7, 0x7, 0x25, 0x56, 0xdc, 0xb5, 0x55, 0xfd,
             0xbe, 0x5e, 0x3a, 0xe3,
@@ -71,7 +71,7 @@ fn test_seed_fingerprint() {
 }
 #[test]
 fn test_seed_fingerprint_is_none() {
-    let odd_seed = vec![
+    let odd_seed = [
         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
         0x0f,
     ];
diff --git a/src/lib.rs b/src/lib.rs
index 0dc5b44..8caca8f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 //!
 //! [ZIP 32]: https://zips.z.cash/zip-0032
 
+#![no_std]
 #![deny(missing_docs)]
 #![deny(unsafe_code)]
 #![deny(rustdoc::broken_intra_doc_links)]
@@ -121,7 +122,7 @@ impl From<u64> for DiversifierIndex {
 }
 
 impl TryFrom<DiversifierIndex> for u32 {
-    type Error = std::num::TryFromIntError;
+    type Error = core::num::TryFromIntError;
 
     fn try_from(di: DiversifierIndex) -> Result<u32, Self::Error> {
         let mut u128_bytes = [0u8; 16];