/*
 * px.h
 *		Header file for pgcrypto.
 * 
 * Copyright (c) 2001 Marko Kreen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: px.h,v 1.2 2001/09/23 04:12:44 momjian Exp $
 */

#ifndef __PX_H
#define __PX_H

#if 1

#define px_alloc(s) palloc(s)
#define px_realloc(p, s) prealloc(p, s)
#define px_free(p)  pfree(p)

#else

void *xalloc(size_t s);
void *xrealloc(void *p, size_t s);
void  xfree(void *p);

#define px_alloc(s) xalloc(s)
#define px_realloc(p, s) xrealloc(p, s)
#define px_free(p)  xfree(p)

#endif

/* max len of 'type' parms */
#define PX_MAX_NAMELEN      128

/* max salt returned */
#define PX_MAX_SALT_LEN		128


typedef struct px_digest PX_MD;
typedef struct px_alias PX_Alias;
typedef struct px_hmac PX_HMAC;
typedef struct px_cipher PX_Cipher;
typedef struct px_combo PX_Combo;

struct px_digest {
	uint (*result_size)(PX_MD *h);
	uint (*block_size)(PX_MD *h);
	void (*reset)(PX_MD *h);
	void (*update)(PX_MD *h, const uint8 *data, uint dlen);
	void (*finish)(PX_MD *h, uint8 *dst);
	void (*free)(PX_MD *h);
	/* private */
	union {
		uint code;
		const void *ptr;
	} p;
};

struct px_alias {
	char *alias;
	char *name;
};

struct px_hmac {
	uint (*result_size)(PX_HMAC *h);
	uint (*block_size)(PX_HMAC *h);
	void (*reset)(PX_HMAC *h);
	void (*update)(PX_HMAC *h, const uint8 *data, uint dlen);
	void (*finish)(PX_HMAC *h, uint8 *dst);
	void (*free)(PX_HMAC *h);
	void (*init)(PX_HMAC *h, const uint8 *key, uint klen);
	
	PX_MD *md;
	/* private */
	struct {
		uint8 *ipad;
		uint8 *opad;
	} p;
};

struct px_cipher {
	uint (*block_size)(PX_Cipher *c);
	uint (*key_size)(PX_Cipher *c);		/* max key len */
	uint (*iv_size)(PX_Cipher *c);
	
	int (*init)(PX_Cipher *c, const uint8 *key, uint klen, const uint8 *iv);
	int (*encrypt)(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res);
	int (*decrypt)(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res);
	void (*free)(PX_Cipher *c);
	/* private */
	void *ptr;
	int pstat; /* mcrypt uses it */
};

struct px_combo {
	int (*init)(PX_Combo *cx, const uint8 *key, uint klen,
			const uint8 *iv, uint ivlen);
	int (*encrypt)(PX_Combo *cx, const uint8 *data, uint dlen,
			uint8 *res, uint *rlen);
	int (*decrypt)(PX_Combo *cx, const uint8 *data, uint dlen,
			uint8 *res, uint *rlen);
	uint (*encrypt_len)(PX_Combo *cx, uint dlen);
	uint (*decrypt_len)(PX_Combo *cx, uint dlen);
	void (*free)(PX_Combo *cx);

	PX_Cipher *cipher;
	uint padding;
};

int px_find_digest(const char *name, PX_MD **res);
int px_find_hmac(const char *name, PX_HMAC **res);
int px_find_cipher(const char *name, PX_Cipher **res);
int px_find_combo(const char *name, PX_Combo **res);

int px_get_random_bytes(uint8 *dst, unsigned count);

const char *px_resolve_alias(const PX_Alias *aliases, const char *name);

#define px_md_result_size(md)		(md)->result_size(md)
#define px_md_block_size(md)		(md)->block_size(md)
#define px_md_reset(md)			(md)->reset(md)
#define px_md_update(md, data, dlen)	(md)->update(md, data, dlen)
#define px_md_finish(md, buf)		(md)->finish(md, buf)
#define px_md_free(md)			(md)->free(md)

#define px_hmac_result_size(hmac)	(hmac)->result_size(hmac)
#define px_hmac_block_size(hmac)	(hmac)->block_size(hmac)
#define px_hmac_reset(hmac)		(hmac)->reset(hmac)
#define px_hmac_init(hmac, key, klen)	(hmac)->init(hmac, key, klen)
#define px_hmac_update(hmac, data, dlen) (hmac)->update(hmac, data, dlen)
#define px_hmac_finish(hmac, buf)	(hmac)->finish(hmac, buf)
#define px_hmac_free(hmac)		(hmac)->free(hmac)


#define px_cipher_key_size(c)		(c)->key_size(c)
#define px_cipher_block_size(c)		(c)->block_size(c)
#define px_cipher_iv_size(c)		(c)->iv_size(c)
#define px_cipher_init(c, k, klen, iv)	(c)->init(c, k, klen, iv)
#define px_cipher_encrypt(c, data, dlen, res) \
					(c)->encrypt(c, data, dlen, res)
#define px_cipher_decrypt(c, data, dlen, res) \
					(c)->decrypt(c, data, dlen, res)
#define px_cipher_free(c)		(c)->free(c)


#define px_combo_encrypt_len(c, dlen)	(c)->encrypt_len(c, dlen)
#define px_combo_decrypt_len(c, dlen)	(c)->decrypt_len(c, dlen)
#define px_combo_init(c, key, klen, iv, ivlen) \
					(c)->init(c, key, klen, iv, ivlen)
#define px_combo_encrypt(c, data, dlen, res, rlen) \
					(c)->encrypt(c, data, dlen, res, rlen)
#define px_combo_decrypt(c, data, dlen, res, rlen) \
					(c)->decrypt(c, data, dlen, res, rlen)
#define px_combo_free(c)		(c)->free(c)


#endif /* __PX_H */

