px.h

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/*
 * 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.
 *
 * contrib/pgcrypto/px.h
 */

#ifndef __PX_H
#define __PX_H

#include <sys/types.h>
#include <sys/param.h>

/* keep debug messages? */
#define PX_DEBUG

/* a way to disable palloc
 * - useful if compiled into standalone
 */
#ifndef PX_OWN_ALLOC
#define px_alloc(s) palloc(s)
#define px_realloc(p, s) repalloc(p, s)
#define px_free(p)  pfree(p)
#else
void       *px_alloc(size_t s);
void       *px_realloc(void *p, size_t s);
void        px_free(void *p);
#endif

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

/* max salt returned */
#define PX_MAX_SALT_LEN     128

/*
 * PX error codes
 */
#define PXE_OK                      0
#define PXE_ERR_GENERIC             -1
#define PXE_NO_HASH                 -2
#define PXE_NO_CIPHER               -3
#define PXE_NOTBLOCKSIZE            -4
#define PXE_BAD_OPTION              -5
#define PXE_BAD_FORMAT              -6
#define PXE_KEY_TOO_BIG             -7
#define PXE_CIPHER_INIT             -8
#define PXE_HASH_UNUSABLE_FOR_HMAC  -9
#define PXE_DEV_READ_ERROR          -10
#define PXE_OSSL_RAND_ERROR         -11
#define PXE_BUG                     -12
#define PXE_ARGUMENT_ERROR          -13
#define PXE_UNKNOWN_SALT_ALGO       -14
#define PXE_BAD_SALT_ROUNDS         -15
#define PXE_MCRYPT_INTERNAL         -16
#define PXE_NO_RANDOM               -17
#define PXE_DECRYPT_FAILED          -18

#define PXE_MBUF_SHORT_READ         -50

#define PXE_PGP_CORRUPT_DATA        -100
#define PXE_PGP_CORRUPT_ARMOR       -101
#define PXE_PGP_UNSUPPORTED_COMPR   -102
#define PXE_PGP_UNSUPPORTED_CIPHER  -103
#define PXE_PGP_UNSUPPORTED_HASH    -104
#define PXE_PGP_COMPRESSION_ERROR   -105
#define PXE_PGP_NOT_TEXT            -106
#define PXE_PGP_UNEXPECTED_PKT      -107
#define PXE_PGP_NO_BIGNUM           -108
#define PXE_PGP_MATH_FAILED         -109
#define PXE_PGP_SHORT_ELGAMAL_KEY   -110
#define PXE_PGP_RSA_UNSUPPORTED     -111
#define PXE_PGP_UNKNOWN_PUBALGO     -112
#define PXE_PGP_WRONG_KEY           -113
#define PXE_PGP_MULTIPLE_KEYS       -114
#define PXE_PGP_EXPECT_PUBLIC_KEY   -115
#define PXE_PGP_EXPECT_SECRET_KEY   -116
#define PXE_PGP_NOT_V4_KEYPKT       -117
#define PXE_PGP_KEYPKT_CORRUPT      -118
#define PXE_PGP_NO_USABLE_KEY       -119
#define PXE_PGP_NEED_SECRET_PSW     -120
#define PXE_PGP_BAD_S2K_MODE        -121
#define PXE_PGP_UNSUPPORTED_PUBALGO -122
#define PXE_PGP_MULTIPLE_SUBKEYS    -123


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

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

struct px_hmac
{
    unsigned    (*result_size) (PX_HMAC *h);
    unsigned    (*block_size) (PX_HMAC *h);
    void        (*reset) (PX_HMAC *h);
    void        (*update) (PX_HMAC *h, const uint8 *data, unsigned dlen);
    void        (*finish) (PX_HMAC *h, uint8 *dst);
    void        (*free) (PX_HMAC *h);
    void        (*init) (PX_HMAC *h, const uint8 *key, unsigned klen);

    PX_MD      *md;
    /* private */
    struct
    {
        uint8      *ipad;
        uint8      *opad;
    }           p;
};

struct px_cipher
{
    unsigned    (*block_size) (PX_Cipher *c);
    unsigned    (*key_size) (PX_Cipher *c);     /* max key len */
    unsigned    (*iv_size) (PX_Cipher *c);

    int         (*init) (PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv);
    int         (*encrypt) (PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res);
    int         (*decrypt) (PX_Cipher *c, const uint8 *data, unsigned 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, unsigned klen,
                                     const uint8 *iv, unsigned ivlen);
    int         (*encrypt) (PX_Combo *cx, const uint8 *data, unsigned dlen,
                                        uint8 *res, unsigned *rlen);
    int         (*decrypt) (PX_Combo *cx, const uint8 *data, unsigned dlen,
                                        uint8 *res, unsigned *rlen);
    unsigned    (*encrypt_len) (PX_Combo *cx, unsigned dlen);
    unsigned    (*decrypt_len) (PX_Combo *cx, unsigned dlen);
    void        (*free) (PX_Combo *cx);

    PX_Cipher  *cipher;
    unsigned    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);
int         px_get_pseudo_random_bytes(uint8 *dst, unsigned count);
int         px_add_entropy(const uint8 *data, unsigned count);

unsigned    px_acquire_system_randomness(uint8 *dst);

const char *px_strerror(int err);

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

void        px_set_debug_handler(void (*handler) (const char *));

#ifdef PX_DEBUG
void
px_debug(const char *fmt,...)
__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
#else
#define px_debug(...)
#endif

#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 */