From e5fb60ebd9e5114ed07596b3e4bc125c4654c8f7 Mon Sep 17 00:00:00 2001
From: Guillermo Orellana <172084+wiyarmir@users.noreply.github.com>
Date: Fri, 8 Sep 2023 13:09:55 +0200
Subject: [PATCH 1/2] make sha256 thread safe

moving the working arrays inside the function call prevents threading issues and doesn't require synchronisation
---
 .../kotlin/org/komputing/khash/sha256/Sha256.kt        | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt b/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt
index 15a9561..47f71b2 100644
--- a/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt
+++ b/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt
@@ -28,11 +28,6 @@ public object Sha256 {
         0x510e527f, -0x64fa9774, 0x1f83d9ab, 0x5be0cd19
     )
 
-    // Working arrays
-    private val W = IntArray(64)
-    private val H = IntArray(8)
-    private val TEMP = IntArray(8)
-
     /**
      * Hashes the given message with SHA-256 and returns the digest.
      *
@@ -40,6 +35,11 @@ public object Sha256 {
      * @return The digest's bytes.
      */
     public fun digest(message: ByteArray): ByteArray {
+        // Working arrays
+        private val W = IntArray(64)
+        private val H = IntArray(8)
+        private val TEMP = IntArray(8)
+    
         // Let H = H0
         H0.copy(0,
             H, 0, H0.size)

From 20c3afc786245537c451e65d956d30ded166b52f Mon Sep 17 00:00:00 2001
From: Guillermo Orellana <172084+wiyarmir@users.noreply.github.com>
Date: Fri, 8 Sep 2023 13:30:24 +0200
Subject: [PATCH 2/2] Update Sha256.kt

---
 .../commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt  | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt b/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt
index 47f71b2..295b21b 100644
--- a/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt
+++ b/sha256/src/commonMain/kotlin/org/komputing/khash/sha256/Sha256.kt
@@ -36,9 +36,9 @@ public object Sha256 {
      */
     public fun digest(message: ByteArray): ByteArray {
         // Working arrays
-        private val W = IntArray(64)
-        private val H = IntArray(8)
-        private val TEMP = IntArray(8)
+        val W = IntArray(64)
+        val H = IntArray(8)
+        val TEMP = IntArray(8)
     
         // Let H = H0
         H0.copy(0,