v4.19.13 snapshot.
diff --git a/include/linux/cryptohash.h b/include/linux/cryptohash.h
new file mode 100644
index 0000000..f6ba4c3
--- /dev/null
+++ b/include/linux/cryptohash.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __CRYPTOHASH_H
+#define __CRYPTOHASH_H
+
+#include <uapi/linux/types.h>
+
+#define SHA_DIGEST_WORDS 5
+#define SHA_MESSAGE_BYTES (512 /*bits*/ / 8)
+#define SHA_WORKSPACE_WORDS 16
+
+void sha_init(__u32 *buf);
+void sha_transform(__u32 *digest, const char *data, __u32 *W);
+
+#endif