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diff --git a/lib/erl_interface/src/misc/eimd5.h b/lib/erl_interface/src/misc/eimd5.h
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+++ b/lib/erl_interface/src/misc/eimd5.h
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+/*
+ * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
+ */
+
+/* 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.
+ */
+
+#ifndef _EIMD5_H
+#define _EIMD5_H
+
+typedef unsigned UINT4;		/* Should be 32 bits. */
+typedef void *POINTER;
+
+
+/*
+ * MD5 context.
+ */
+
+typedef struct {
+    UINT4 state[4];		/* state (ABCD) */
+    UINT4 count[2];		/* number of bits, modulo 2^64 (lsb first) */
+    unsigned char buffer[64];	/* input buffer */
+} MD5_CTX;
+
+void ei_MD5Init(MD5_CTX *);
+void ei_MD5Update(MD5_CTX *, unsigned char *, unsigned int);
+void ei_MD5Final(unsigned char [16], MD5_CTX *);
+
+#endif /* _EIMD5_H */