diff --git a/libc/include/sha1.h b/libc/include/sha1.h
new file mode 100644
index 0000000..f7ada46
--- /dev/null
+++ b/libc/include/sha1.h
@@ -0,0 +1,31 @@
+/*	$NetBSD: sha1.h,v 1.13 2005/12/26 18:41:36 perry Exp $	*/
+
+/*
+ * SHA-1 in C
+ * By Steve Reid <steve@edmweb.com>
+ * 100% Public Domain
+ */
+
+#ifndef _SYS_SHA1_H_
+#define	_SYS_SHA1_H_
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#define SHA1_DIGEST_LENGTH		20
+#define SHA1_DIGEST_STRING_LENGTH	41
+
+typedef struct {
+	uint32_t state[5];
+	uint32_t count[2];
+	u_char buffer[64];
+} SHA1_CTX;
+
+__BEGIN_DECLS
+void	SHA1Transform(uint32_t[5], const u_char[64]);
+void	SHA1Init(SHA1_CTX *);
+void	SHA1Update(SHA1_CTX *, const u_char *, u_int);
+void	SHA1Final(u_char[SHA1_DIGEST_LENGTH], SHA1_CTX *);
+__END_DECLS
+
+#endif /* _SYS_SHA1_H_ */