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diff --git a/pam/pam.h b/pam/pam.h
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+/*
+ * pam.h - Functions to let us call into libpam from Go.
+ *
+ * Copyright 2017 Google Inc.
+ * Author: Joe Richey (joerichey@google.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+#ifndef FSCRYPT_PAM_H
+#define FSCRYPT_PAM_H
+
+#include <security/pam_appl.h>
+
+// fscrypt_service is the display name of the service requesting the passphrase.
+const char* fscrypt_service;
+
+// pam_init initializes the pam_conv structure for use with our Go callbacks.
+void pam_init(struct pam_conv* conv);
+
+#endif