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diff --git a/lib/md5.h b/lib/md5.h
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+/*
+ * MD5 hashing code copied from Lepton's crack <http://usuarios.lycos.es/reinob/>
+ *
+ * Adapted to be API-compatible with the previous (GPL-incompatible) code.
+ */
+
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+
+#ifndef _MD5_H
+#define _MD5_H
+
+#include <sys/types.h>
+#include <gmodule.h>
+#include <stdint.h>
+
+typedef uint8_t md5_byte_t;
+typedef struct MD5Context {
+	uint32_t buf[4];
+	uint32_t bits[2];
+	unsigned char in[64];
+} md5_state_t;
+
+G_MODULE_EXPORT void md5_init(struct MD5Context *context);
+G_MODULE_EXPORT void md5_append(struct MD5Context *context, const md5_byte_t *buf, unsigned int len);
+G_MODULE_EXPORT void md5_finish(struct MD5Context *context, md5_byte_t digest[16]);
+
+#endif