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diff --git a/src/md5.h b/src/md5.h
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+/* md5.h - Declaration of functions and data types used for MD5 sum
+   computing library functions.
+   Copyright (C) 1995, 1996, 1999 Free Software Foundation, Inc.
+   NOTE: The canonical source of this file is maintained with the GNU C
+   Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef _MD5_H
+#define _MD5_H 1
+
+#include <limits.h>
+#include <stdint.h>
+typedef uint32_t md5_uint32;
+typedef uintptr_t md5_uintptr;
+
+/* Structure to save state of computation between the single steps.  */
+struct md5_ctx
+{
+  md5_uint32 A;
+  md5_uint32 B;
+  md5_uint32 C;
+  md5_uint32 D;
+
+  md5_uint32 total[2];
+  md5_uint32 buflen;
+  char buffer[128];
+};
+
+/*
+ * The following three functions are build up the low level used in
+ * the function `md5_buffer'.
+ */
+
+/* Initialize structure containing state of computation.
+   (RFC 1321, 3.3: Step 3)  */
+extern void md5_init_ctx (struct md5_ctx *ctx);
+
+/* 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 necessary that LEN is a multiple of 64!!! */
+extern void md5_process_block __P ((const void *buffer, size_t len,
+				    struct md5_ctx *ctx));
+
+/* 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 64.  */
+extern void md5_process_bytes __P ((const void *buffer, size_t len,
+				    struct md5_ctx *ctx));
+
+/* Process the remaining bytes in the buffer and put result from CTX
+   in first 16 bytes following RESBUF.  The result is always in little
+   endian byte order, so that a byte-wise output yields to the wanted
+   ASCII representation of the message digest.
+
+   IMPORTANT: On some systems it is required that RESBUF be correctly
+   aligned for a 32 bits value.  */
+extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf);
+
+
+/* Put result from CTX in first 16 bytes following RESBUF.  The result is
+   always in little endian byte order, so that a byte-wise output yields
+   to the wanted ASCII representation of the message digest.
+
+   IMPORTANT: On some systems it is required that RESBUF is correctly
+   aligned for a 32 bits value.  */
+extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf);
+
+
+/* Compute MD5 message digest for LEN bytes beginning at BUFFER.  The
+   result is always in little endian byte order, so that a byte-wise
+   output yields to the wanted ASCII representation of the message
+   digest.  */
+extern void *md5_buffer (const char *buffer, size_t len, void *resblock);
+
+/* The following is from gnupg-1.0.2's cipher/bithelp.h.  */
+/* Rotate a 32 bit integer by n bytes */
+#if defined __GNUC__ && defined __i386__
+static inline md5_uint32
+rol(md5_uint32 x, int n)
+{
+  __asm__("roll %%cl,%0"
+	  :"=r" (x)
+	  :"0" (x),"c" (n));
+  return x;
+}
+#else
+# define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
+#endif
+
+#endif