diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -873,6 +873,8 @@
     'DiffusionIdentityViewController' => 'applications/diffusion/controller/DiffusionIdentityViewController.php',
     'DiffusionInlineCommentController' => 'applications/diffusion/controller/DiffusionInlineCommentController.php',
     'DiffusionInternalAncestorsConduitAPIMethod' => 'applications/diffusion/conduit/DiffusionInternalAncestorsConduitAPIMethod.php',
+    'DiffusionInternalCommitSearchConduitAPIMethod' => 'applications/diffusion/conduit/DiffusionInternalCommitSearchConduitAPIMethod.php',
+    'DiffusionInternalCommitSearchEngine' => 'applications/audit/query/DiffusionInternalCommitSearchEngine.php',
     'DiffusionInternalGitRawDiffQueryConduitAPIMethod' => 'applications/diffusion/conduit/DiffusionInternalGitRawDiffQueryConduitAPIMethod.php',
     'DiffusionLastModifiedController' => 'applications/diffusion/controller/DiffusionLastModifiedController.php',
     'DiffusionLastModifiedQueryConduitAPIMethod' => 'applications/diffusion/conduit/DiffusionLastModifiedQueryConduitAPIMethod.php',
@@ -6973,6 +6975,8 @@
     'DiffusionIdentityViewController' => 'DiffusionController',
     'DiffusionInlineCommentController' => 'PhabricatorInlineCommentController',
     'DiffusionInternalAncestorsConduitAPIMethod' => 'DiffusionQueryConduitAPIMethod',
+    'DiffusionInternalCommitSearchConduitAPIMethod' => 'PhabricatorSearchEngineAPIMethod',
+    'DiffusionInternalCommitSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'DiffusionInternalGitRawDiffQueryConduitAPIMethod' => 'DiffusionQueryConduitAPIMethod',
     'DiffusionLastModifiedController' => 'DiffusionController',
     'DiffusionLastModifiedQueryConduitAPIMethod' => 'DiffusionQueryConduitAPIMethod',
diff --git a/src/applications/audit/query/DiffusionInternalCommitSearchEngine.php b/src/applications/audit/query/DiffusionInternalCommitSearchEngine.php
new file mode 100644
--- /dev/null
+++ b/src/applications/audit/query/DiffusionInternalCommitSearchEngine.php
@@ -0,0 +1,75 @@
+<?php
+
+final class DiffusionInternalCommitSearchEngine
+  extends PhabricatorApplicationSearchEngine {
+
+  public function getResultTypeDescription() {
+    return pht('Diffusion Raw Commits');
+  }
+
+  public function getApplicationClassName() {
+    return 'PhabricatorDiffusionApplication';
+  }
+
+  public function newQuery() {
+    return new DiffusionCommitQuery();
+  }
+
+  protected function buildQueryFromParameters(array $map) {
+    $query = $this->newQuery();
+
+    if ($map['repositoryPHIDs']) {
+      $query->withRepositoryPHIDs($map['repositoryPHIDs']);
+    }
+
+    return $query;
+  }
+
+  protected function buildCustomSearchFields() {
+    return array(
+      id(new PhabricatorSearchDatasourceField())
+        ->setLabel(pht('Repositories'))
+        ->setKey('repositoryPHIDs')
+        ->setDatasource(new DiffusionRepositoryFunctionDatasource())
+        ->setDescription(pht('Find commits in particular repositories.')),
+    );
+  }
+
+  protected function getURI($path) {
+    return null;
+  }
+
+  protected function renderResultList(
+    array $commits,
+    PhabricatorSavedQuery $query,
+    array $handles) {
+    return null;
+  }
+
+  protected function getObjectWireFieldsForConduit(
+    $object,
+    array $field_extensions,
+    array $extension_data) {
+
+    $commit = $object;
+    $viewer = $this->requireViewer();
+
+    $repository = $commit->getRepository();
+    $identifier = $commit->getCommitIdentifier();
+
+    id(new DiffusionRepositoryClusterEngine())
+      ->setViewer($viewer)
+      ->setRepository($repository)
+      ->synchronizeWorkingCopyBeforeRead();
+
+    $ref = id(new DiffusionLowLevelCommitQuery())
+      ->setRepository($repository)
+      ->withIdentifier($identifier)
+      ->execute();
+
+    return array(
+      'ref' => $ref->newDictionary(),
+    );
+  }
+
+}
diff --git a/src/applications/diffusion/conduit/DiffusionInternalCommitSearchConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionInternalCommitSearchConduitAPIMethod.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/conduit/DiffusionInternalCommitSearchConduitAPIMethod.php
@@ -0,0 +1,58 @@
+<?php
+
+final class DiffusionInternalCommitSearchConduitAPIMethod
+  extends PhabricatorSearchEngineAPIMethod {
+
+  public function getAPIMethodName() {
+    return 'internal.commit.search';
+  }
+
+  public function newSearchEngine() {
+    return new DiffusionInternalCommitSearchEngine();
+  }
+
+  public function getMethodSummary() {
+    return pht('Read raw information about commits.');
+  }
+
+  protected function newConduitCallProxyClient(ConduitAPIRequest $request) {
+    $viewer = $request->getViewer();
+
+    $constraints = $request->getValue('constraints');
+    if (is_array($constraints)) {
+      $repository_phids = idx($constraints, 'repositoryPHIDs');
+    } else {
+      $repository_phids = array();
+    }
+
+    $repository_phid = null;
+    if (is_array($repository_phids)) {
+      if (phutil_is_natural_list($repository_phids)) {
+        if (count($repository_phids) === 1) {
+          $value = head($repository_phids);
+          if (is_string($value)) {
+            $repository_phid = $value;
+          }
+        }
+      }
+    }
+
+    if ($repository_phid === null) {
+      throw new Exception(
+        pht(
+          'This internal method must be invoked with a "repositoryPHIDs" '.
+          'constraint with exactly one value.'));
+    }
+
+    $repository = id(new PhabricatorRepositoryQuery())
+      ->setViewer($viewer)
+      ->withPHIDs(array($repository_phid))
+      ->executeOne();
+    if (!$repository) {
+      return array();
+    }
+
+    return $repository->newConduitClientForRequest($request);
+  }
+
+}
diff --git a/src/applications/diffusion/data/DiffusionCommitHash.php b/src/applications/diffusion/data/DiffusionCommitHash.php
--- a/src/applications/diffusion/data/DiffusionCommitHash.php
+++ b/src/applications/diffusion/data/DiffusionCommitHash.php
@@ -34,4 +34,21 @@
     }
     return $hash_objects;
   }
+
+  public static function newFromDictionary(array $map) {
+    $hash_type = idx($map, 'type');
+    $hash_value = idx($map, 'value');
+
+    return id(new self())
+      ->setHashType($hash_type)
+      ->setHashValue($hash_value);
+  }
+
+  public function newDictionary() {
+    return array(
+      'type' => $this->hashType,
+      'value' => $this->hashValue,
+    );
+  }
+
 }
diff --git a/src/applications/diffusion/data/DiffusionCommitRef.php b/src/applications/diffusion/data/DiffusionCommitRef.php
--- a/src/applications/diffusion/data/DiffusionCommitRef.php
+++ b/src/applications/diffusion/data/DiffusionCommitRef.php
@@ -10,28 +10,52 @@
   private $committerEmail;
   private $hashes = array();
 
-  public static function newFromConduitResult(array $result) {
-    $ref = id(new DiffusionCommitRef())
-      ->setAuthorEpoch(idx($result, 'authorEpoch'))
-      ->setCommitterEmail(idx($result, 'committerEmail'))
-      ->setCommitterName(idx($result, 'committerName'))
-      ->setAuthorEmail(idx($result, 'authorEmail'))
-      ->setAuthorName(idx($result, 'authorName'))
-      ->setMessage(idx($result, 'message'));
-
-    $hashes = array();
-    foreach (idx($result, 'hashes', array()) as $hash_result) {
-      $hashes[] = id(new DiffusionCommitHash())
-        ->setHashType(idx($hash_result, 'type'))
-        ->setHashValue(idx($hash_result, 'value'));
+  public function newDictionary() {
+    $hashes = $this->getHashes();
+    $hashes = mpull($hashes, 'newDictionary');
+    $hashes = array_values($hashes);
+
+    return array(
+      'authorEpoch' => $this->authorEpoch,
+      'authorName' => $this->authorName,
+      'authorEmail' => $this->authorEmail,
+      'committerName' => $this->committerName,
+      'committerEmail' => $this->committerEmail,
+      'message' => $this->message,
+      'hashes' => $hashes,
+    );
+  }
+
+  public static function newFromDictionary(array $map) {
+    $hashes = idx($map, 'hashes', array());
+    foreach ($hashes as $key => $hash_map) {
+      $hashes[$key] = DiffusionCommitHash::newFromDictionary($hash_map);
     }
+    $hashes = array_values($hashes);
+
+    $author_epoch = idx($map, 'authorEpoch');
+    $author_name = idx($map, 'authorName');
+    $author_email = idx($map, 'authorEmail');
+    $committer_name = idx($map, 'committerName');
+    $committer_email = idx($map, 'committerEmail');
+    $message = idx($map, 'message');
 
-    $ref->setHashes($hashes);
+    return id(new self())
+      ->setAuthorEpoch($author_epoch)
+      ->setAuthorName($author_name)
+      ->setAuthorEmail($author_email)
+      ->setCommitterName($committer_name)
+      ->setCommitterEmail($committer_email)
+      ->setMessage($message)
+      ->setHashes($hashes);
+  }
 
-    return $ref;
+  public static function newFromConduitResult(array $result) {
+    return self::newFromDictionary($result);
   }
 
   public function setHashes(array $hashes) {
+    assert_instances_of($hashes, 'DiffusionCommitHash');
     $this->hashes = $hashes;
     return $this;
   }
diff --git a/src/applications/repository/storage/PhabricatorRepositoryCommitData.php b/src/applications/repository/storage/PhabricatorRepositoryCommitData.php
--- a/src/applications/repository/storage/PhabricatorRepositoryCommitData.php
+++ b/src/applications/repository/storage/PhabricatorRepositoryCommitData.php
@@ -92,4 +92,13 @@
     return array_values($holds);
   }
 
+  public function setCommitRef(DiffusionCommitRef $ref) {
+    $this->setCommitDetail('commitRef', $ref->newDictionary());
+  }
+
+  public function newCommitRef() {
+    $map = $this->getCommitDetail('commitRef', array());
+    return DiffusionCommitRef::neWFromDictionary($map);
+  }
+
 }