/**
 * \file md5.h
 * This implementation of MD5 comes from the XYSSL project.
 */
#ifndef LIBMKV_MD5_H
#define LIBMKV_MD5_H

/**
 * \brief          MD5 context structure
 */
typedef struct {
	unsigned long total[2];		/*!< number of bytes processed  */
	unsigned long state[4];		/*!< intermediate digest state  */
	unsigned char buffer[64];	/*!< data block being processed */

	unsigned char ipad[64];		/*!< HMAC: inner padding        */
	unsigned char opad[64];		/*!< HMAC: outer padding        */
} md5_context;

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief          MD5 context setup
 *
 * \param ctx      context to be initialized
 */
	void md5_starts(md5_context * ctx);

/**
 * \brief          MD5 process buffer
 *
 * \param ctx      MD5 context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 */
	void md5_update(md5_context * ctx, unsigned char *input, int ilen);

/**
 * \brief          MD5 final digest
 *
 * \param ctx      MD5 context
 * \param output   MD5 checksum result
 */
	void md5_finish(md5_context * ctx, unsigned char output[16]);

/**
 * \brief          Output = MD5( input buffer )
 *
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 * \param output   MD5 checksum result
 */
	void md5(unsigned char *input, int ilen, unsigned char output[16]);

/**
 * \brief          Output = MD5( file contents )
 *
 * \param path     input file name
 * \param output   MD5 checksum result
 *
 * \return         0 if successful, 1 if fopen failed,
 *                 or 2 if fread failed
 */
	int md5_file(char *path, unsigned char output[16]);

/**
 * \brief          MD5 HMAC context setup
 *
 * \param ctx      HMAC context to be initialized
 * \param key      HMAC secret key
 * \param keylen   length of the HMAC key
 */
	void md5_hmac_starts(md5_context * ctx, unsigned char *key,
						 int keylen);

/**
 * \brief          MD5 HMAC process buffer
 *
 * \param ctx      HMAC context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 */
	void md5_hmac_update(md5_context * ctx, unsigned char *input,
						 int ilen);

/**
 * \brief          MD5 HMAC final digest
 *
 * \param ctx      HMAC context
 * \param output   MD5 HMAC checksum result
 */
	void md5_hmac_finish(md5_context * ctx, unsigned char output[16]);

/**
 * \brief          Output = HMAC-MD5( hmac key, input buffer )
 *
 * \param key      HMAC secret key
 * \param keylen   length of the HMAC key
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 * \param output   HMAC-MD5 result
 */
	void md5_hmac(unsigned char *key, int keylen,
				  unsigned char *input, int ilen,
				  unsigned char output[16]);

/**
 * \brief          Checkup routine
 *
 * \return         0 if successful, or 1 if the test failed
 */
	int md5_self_test(int verbose);

#ifdef __cplusplus
}
#endif
#endif							/* md5.h */
