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diff --git a/libcrypt/sha512.h b/libcrypt/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.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 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) attribute_hidden;
+
+/* 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) attribute_hidden;
+
+/* 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)
+ attribute_hidden;
+
+#endif /* sha512.h */