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diff --git a/src/lib/md5.h b/src/lib/md5.h
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+/*
+ * 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 MHD_MD5_H
+#define MHD_MD5_H
+
+#include "platform.h"
+
+#define MD5_BLOCK_SIZE              64
+#define MD5_DIGEST_SIZE             16
+#define MD5_DIGEST_STRING_LENGTH    (MD5_DIGEST_SIZE * 2 + 1)
+
+struct MD5Context
+{
+  uint32_t state[4];                    /* state */
+  uint64_t count;                       /* number of bits, mod 2^64 */
+  uint8_t buffer[MD5_BLOCK_SIZE];       /* input buffer */
+};
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void MD5Init(struct MD5Context *ctx);
+
+/*
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes.
+ */
+void MD5Update(struct MD5Context *ctx, const unsigned char *input, size_t len);
+
+/*
+ * Pad pad to 64-byte boundary with the bit pattern
+ * 1 0* (64-bit count of bits processed, MSB-first)
+ */
+void MD5Pad(struct MD5Context *ctx);
+
+/*
+ * Final wrapup--call MD5Pad, fill in digest and zero out ctx.
+ */
+void MD5Final(unsigned char digest[MD5_DIGEST_SIZE], struct MD5Context *ctx);
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data.  MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+void MD5Transform(uint32_t state[4], const uint8_t block[MD5_BLOCK_SIZE]);
+
+#endif /* !MHD_MD5_H */