From 4791d16a8efc42fb40ffab79bcdae4f0e106cd89 Mon Sep 17 00:00:00 2001
From: Matt Mastracci <matthew@mastracci.com>
Date: Thu, 7 Mar 2024 10:00:43 -0700
Subject: perf(cli): use faster_hex (#22761)

`cli::util::checksum` was showing up on flame graphs because it was
concatenating allocated strings. We can use `faster-hex` to improve it.
---
 cli/tools/registry/mod.rs        | 2 +-
 cli/tools/registry/provenance.rs | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

(limited to 'cli/tools')

diff --git a/cli/tools/registry/mod.rs b/cli/tools/registry/mod.rs
index 7b940592f..faea95a1a 100644
--- a/cli/tools/registry/mod.rs
+++ b/cli/tools/registry/mod.rs
@@ -688,7 +688,7 @@ async fn publish_package(
         package.scope, package.package, package.version
       ),
       digest: provenance::SubjectDigest {
-        sha256: hex::encode(sha2::Sha256::digest(&meta_bytes)),
+        sha256: faster_hex::hex_string(&sha2::Sha256::digest(&meta_bytes)),
       },
     };
     let bundle = provenance::generate_provenance(subject).await?;
diff --git a/cli/tools/registry/provenance.rs b/cli/tools/registry/provenance.rs
index 117c10abc..69926372e 100644
--- a/cli/tools/registry/provenance.rs
+++ b/cli/tools/registry/provenance.rs
@@ -622,12 +622,12 @@ async fn testify(
   // Rekor "intoto" entry for the given DSSE envelope and signature.
   //
   // Calculate the value for the payloadHash field into the Rekor entry
-  let payload_hash = hex::encode(sha2::Sha256::digest(
+  let payload_hash = faster_hex::hex_string(&sha2::Sha256::digest(
     content.dsse_envelope.payload.as_bytes(),
   ));
 
   // Calculate the value for the hash field into the Rekor entry
-  let envelope_hash = hex::encode({
+  let envelope_hash = faster_hex::hex_string(&{
     let dsse = DsseEnvelope {
       payload: content.dsse_envelope.payload.clone(),
       payload_type: content.dsse_envelope.payload_type.clone(),
-- 
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