hmac-md5.h
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hmac-md5.h
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	/* hmac-md5.h -- HMAC_MD5 functions
	* $Id: hmac-md5.h,v 1.2 2006/11/30 17:11:22 murch Exp $
	*/

	#ifndef HMAC_MD5_H
	#define HMAC_MD5_H 1

	#define HMAC_MD5_SIZE 16

	/* intermediate MD5 context */
	typedef struct HMAC_MD5_CTX_s {
	MD5_CTX ictx, octx;
	} HMAC_MD5_CTX;

	/* intermediate HMAC state
	* values stored in network byte order (Big Endian)
	*/
	typedef struct HMAC_MD5_STATE_s {
	UINT4 istate[4];
	UINT4 ostate[4];
	} HMAC_MD5_STATE;

	/* One step hmac computation
	*
	* digest may be same as text or key
	*/
	void hmac_md5(const unsigned char *text, int text_len,
	const unsigned char *key, int key_len,
	unsigned char digest[HMAC_MD5_SIZE]);

	/* create context from key
	*/
	void hmac_md5_init(HMAC_MD5_CTX *hmac,
	const unsigned char *key, int key_len);

	/* precalculate intermediate state from key
	*/
	void hmac_md5_precalc(HMAC_MD5_STATE *hmac,
	const unsigned char *key, int key_len);

	/* initialize context from intermediate state
	*/
	void hmac_md5_import(HMAC_MD5_CTX hmac, HMAC_MD5_STATE state);

	#define hmac_md5_update(hmac, text, text_len) MD5Update(&(hmac)->ictx, (text), (text_len))

	/* finish hmac from intermediate result. Intermediate result is zeroed.
	*/
	void hmac_md5_final(unsigned char digest[HMAC_MD5_SIZE],
	HMAC_MD5_CTX *hmac);

	#endif /* HMAC_MD5_H */