diff --git a/tests/test_downloads_tab_workflow_route.mjs b/tests/test_downloads_tab_workflow_route.mjs
index bb2dcd5..ddcf2d7 100644
--- a/tests/test_downloads_tab_workflow_route.mjs
+++ b/tests/test_downloads_tab_workflow_route.mjs
@@ -19,6 +19,7 @@ import {
 } from '../web/resolver/node_context_menu.js';
 import { startSplitterDrag } from '../web/resolver/utils/splitter_drag.js';
 import { normalizeDownloadCategoryValue } from '../web/resolver/utils/category_utils.js';
+import { normalizeSha256 } from '../web/resolver/utils/hash_utils.js';
 import { baseModelAliasMethods } from '../web/resolver/search/base_model_alias_methods.js';
 import { searchHashMethods } from '../web/resolver/search/search_hash_methods.js';
 import { missingModelStateMethods } from '../web/resolver/views/missing_model_state_methods.js';
@@ -34,6 +35,7 @@ import {
 } from '../web/resolver/custom_nodes/registry.js';
 
 void normalizeDownloadCategoryValue;
+void normalizeSha256;
 
 const projectRoot = path.resolve(import.meta.dirname, '..');
 const queueMethodsSource = fs.readFileSync(
diff --git a/tests/test_search_hash_methods.mjs b/tests/test_search_hash_methods.mjs
index cdd8f2c..eb0a3d4 100644
--- a/tests/test_search_hash_methods.mjs
+++ b/tests/test_search_hash_methods.mjs
@@ -2,6 +2,7 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 
 import { searchHashMethods } from '../web/resolver/search/search_hash_methods.js';
+import { normalizeSha256 } from '../web/resolver/utils/hash_utils.js';
 
 function createDialog(overrides = {}) {
   return { ...searchHashMethods, ...overrides };
@@ -10,6 +11,14 @@ function createDialog(overrides = {}) {
 const hashA = 'a'.repeat(64);
 const hashB = 'b'.repeat(64);
 
+test('shared SHA-256 normalization preserves the accepted input contract', () => {
+  assert.equal(normalizeSha256(`sha256:${hashA.toUpperCase()}`), hashA);
+  assert.equal(normalizeSha256('SHA256=' + hashB), hashB);
+  assert.equal(normalizeSha256('short'), '');
+  assert.equal(normalizeSha256(hashA + 'x'), '');
+  assert.equal(normalizeSha256(null), '');
+});
+
 test('search hash normalization accepts SHA-256 prefixes and rejects invalid values', () => {
   const dialog = createDialog();
   assert.equal(dialog.normalizeSearchResultSha256(`sha256:${hashA.toUpperCase()}`), hashA);
diff --git a/web/resolver/search/search_hash_methods.js b/web/resolver/search/search_hash_methods.js
index 3c6f529..bc4db1f 100644
--- a/web/resolver/search/search_hash_methods.js
+++ b/web/resolver/search/search_hash_methods.js
@@ -1,8 +1,8 @@
+import { normalizeSha256 } from '../utils/hash_utils.js';
+
 export const searchHashMethods = {
     normalizeSearchResultSha256(value = '') {
-        let text = String(value || '').trim();
-        text = text.replace(/^sha256[:=]/i, '').trim().toLowerCase();
-        return /^[a-f0-9]{64}$/.test(text) ? text : '';
+        return normalizeSha256(value);
     },
 
     getSearchResultSha256(result = {}) {
diff --git a/web/resolver/utils/hash_utils.js b/web/resolver/utils/hash_utils.js
new file mode 100644
index 0000000..71ad5e6
--- /dev/null
+++ b/web/resolver/utils/hash_utils.js
@@ -0,0 +1,5 @@
+export function normalizeSha256(value = '') {
+    let text = String(value || '').trim();
+    text = text.replace(/^sha256[:=]/i, '').trim().toLowerCase();
+    return /^[a-f0-9]{64}$/.test(text) ? text : '';
+}
diff --git a/web/resolver/views/model_hash_compare_methods.js b/web/resolver/views/model_hash_compare_methods.js
index cad85e9..a51e102 100644
--- a/web/resolver/views/model_hash_compare_methods.js
+++ b/web/resolver/views/model_hash_compare_methods.js
@@ -1,8 +1,8 @@
+import { normalizeSha256 } from '../utils/hash_utils.js';
+
 export const modelHashCompareMethods = {
     normalizeSha256ForCompare(value = '') {
-        let text = String(value || '').trim();
-        text = text.replace(/^sha256[:=]/i, '').trim().toLowerCase();
-        return /^[a-f0-9]{64}$/.test(text) ? text : '';
+        return normalizeSha256(value);
     },
 
     formatSha256Short(value = '') {