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diff --git a/src/pdflib/pdcore/pc_md5.h b/src/pdflib/pdcore/pc_md5.h
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+++ b/src/pdflib/pdcore/pc_md5.h
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+/* $Id: pc_md5.h,v 1.1 2008/10/17 06:10:43 scuri Exp $
+ *
+ * Header file for the PDFlib MD5 message digest routines
+ *
+ */
+
+/* This is a slightly modified version of the RSA reference
+ * implementation for MD5, which originally contained
+ * the following copyright notice:
+ */
+
+/*  Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+    rights reserved.
+
+    License to copy and use this software is granted provided that it
+    is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+    Algorithm" in all material mentioning or referencing this software
+    or this function.
+
+    License is also granted to make and use derivative works provided
+    that such works are identified as "derived from the RSA Data
+    Security, Inc. MD5 Message-Digest Algorithm" in all material
+    mentioning or referencing the derived work.
+
+    RSA Data Security, Inc. makes no representations concerning either
+    the merchantability of this software or the suitability of this
+    software for any particular purpose. It is provided "as is"
+    without express or implied warranty of any kind.
+
+    These notices must be retained in any copies of any part of this
+    documentation and/or software.
+ */
+
+
+/* we prefix our MD5 function and structure names with "pdc_", so you can
+ * link your program with another MD5 lib without troubles.
+ */
+#define MD5_Init	pdc_MD5_Init
+#define MD5_Update	pdc_MD5_Update
+#define MD5_Final	pdc_MD5_Final
+
+#define MD5_CTX		pdc_MD5_CTX
+
+typedef unsigned int MD5_UINT4;
+
+#define MD5_DIGEST_LENGTH	16
+
+
+/* MD5 context. */
+typedef struct {
+    MD5_UINT4 state[4];		/* state (ABCD) */
+    MD5_UINT4 count[2];		/* number of bits, modulo 2^64 (lsb first) */
+    unsigned char buffer[64];	/* input buffer */
+} MD5_CTX;
+
+void MD5_Init(MD5_CTX *context);
+void MD5_Update(
+	MD5_CTX *context, const unsigned char *input, unsigned int inputLen);
+void MD5_Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *context);