v4.19.13 snapshot.
diff --git a/include/linux/digsig.h b/include/linux/digsig.h
new file mode 100644
index 0000000..6f85a07
--- /dev/null
+++ b/include/linux/digsig.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2011 Nokia Corporation
+ * Copyright (C) 2011 Intel Corporation
+ *
+ * Author:
+ * Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
+ * <dmitry.kasatkin@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ */
+
+#ifndef _DIGSIG_H
+#define _DIGSIG_H
+
+#include <linux/key.h>
+
+enum pubkey_algo {
+ PUBKEY_ALGO_RSA,
+ PUBKEY_ALGO_MAX,
+};
+
+enum digest_algo {
+ DIGEST_ALGO_SHA1,
+ DIGEST_ALGO_SHA256,
+ DIGEST_ALGO_MAX
+};
+
+struct pubkey_hdr {
+ uint8_t version; /* key format version */
+ uint32_t timestamp; /* key made, always 0 for now */
+ uint8_t algo;
+ uint8_t nmpi;
+ char mpi[0];
+} __packed;
+
+struct signature_hdr {
+ uint8_t version; /* signature format version */
+ uint32_t timestamp; /* signature made */
+ uint8_t algo;
+ uint8_t hash;
+ uint8_t keyid[8];
+ uint8_t nmpi;
+ char mpi[0];
+} __packed;
+
+#if defined(CONFIG_SIGNATURE) || defined(CONFIG_SIGNATURE_MODULE)
+
+int digsig_verify(struct key *keyring, const char *sig, int siglen,
+ const char *digest, int digestlen);
+
+#else
+
+static inline int digsig_verify(struct key *keyring, const char *sig,
+ int siglen, const char *digest, int digestlen)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_SIGNATURE */
+
+#endif /* _DIGSIG_H */