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diff --git a/genisoimage/sha512.h b/genisoimage/sha512.h
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+/* Declaration of functions and data types used for SHA512 sum computing
+   library functions.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+
+   Copied here from the GNU C Library version 2.7 on the 10 May 2009
+   by Steve McIntyre <93sam@debian.org>. This code was under GPL v2.1
+   in glibc, and that license gives us the option to use and
+   distribute the code under the terms of the GPL v2 instead. I'm
+   taking that option.
+
+   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; either version 2, or (at your option) any
+   later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _SHA512_H
+#define _SHA512_H 1
+
+#include <limits.h>
+#include <stdint.h>
+#include <stdio.h>
+
+
+/* Structure to save state of computation between the single steps.  */
+struct sha512_ctx
+{
+  uint64_t H[8];
+
+  uint64_t total[2];
+  uint64_t buflen;
+  char buffer[256] __attribute__ ((__aligned__ (__alignof__ (uint64_t))));
+};
+
+/* Initialize structure containing state of computation.
+   (FIPS 180-2: 5.3.3)  */
+extern void sha512_init_ctx (struct sha512_ctx *ctx) __THROW;
+
+/* Starting with the result of former calls of this function (or the
+   initialization function update the context for the next LEN bytes
+   starting at BUFFER.
+   It is NOT required that LEN is a multiple of 128.  */
+extern void sha512_process_bytes (const void *buffer, size_t len,
+				    struct sha512_ctx *ctx) __THROW;
+
+/* Process the remaining bytes in the buffer and put result from CTX
+   in first 64 bytes following RESBUF.
+
+   IMPORTANT: On some systems it is required that RESBUF is correctly
+   aligned for a 64 bits value.  */
+extern void *sha512_finish_ctx (struct sha512_ctx *ctx, void *resbuf)
+  __THROW;
+
+#endif /* sha512.h */