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postgresql/contrib/pgcrypto/px.h
Peter Eisentraut f5576a21b0 pgcrypto: Remove internal padding implementation 
Use the padding provided by OpenSSL instead of doing it ourselves.
The internal implementation was once applicable to the non-OpenSSL
code paths, but those have since been removed.  The padding algorithm
is still the same.

The OpenSSL padding implementation is stricter than the previous
internal one: Bad padding during decryption is now an error, and
encryption without padding now requires the input size to be a
multiple of the block size, otherwise it is also an error.
Previously, these cases silently proceeded, in spite of the
documentation saying otherwise.

Add some test cases about this, too.  (The test cases are in
rijndael.sql, but they apply to all encryption algorithms.)

Reviewed-by: Jacob Champion <pchampion@vmware.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/ba94c26b-0c58-c97e-7a44-f44e08b4cca2%40enterprisedb.com
2022-03-22 08:58:44 +01:00

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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/param.h>
/* keep debug messages? */
#define PX_DEBUG
/* 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
/* -4 is unused */
#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
/* -10 is unused */
/* -11 is unused */
#define PXE_BUG -12
#define PXE_ARGUMENT_ERROR -13
#define PXE_UNKNOWN_SALT_ALGO -14
#define PXE_BAD_SALT_ROUNDS -15
/* -16 is unused */
#define PXE_NO_RANDOM -17
#define PXE_DECRYPT_FAILED -18
#define PXE_ENCRYPT_FAILED -19
#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
/* -108 is unused */
#define PXE_PGP_MATH_FAILED -109
#define PXE_PGP_SHORT_ELGAMAL_KEY -110
/* -111 is unused */
#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, int padding, const uint8 *data, unsigned dlen, uint8 *res, unsigned *rlen);
int (*decrypt) (PX_Cipher *c, int padding, const uint8 *data, unsigned dlen, uint8 *res, unsigned *rlen);
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);
void px_THROW_ERROR(int err) pg_attribute_noreturn();
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 *));
void px_memset(void *ptr, int c, size_t len);
#ifdef PX_DEBUG
void px_debug(const char *fmt,...) pg_attribute_printf(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, padding, data, dlen, res, rlen) \
(c)->encrypt(c, padding, data, dlen, res, rlen)
#define px_cipher_decrypt(c, padding, data, dlen, res, rlen) \
(c)->decrypt(c, padding, data, dlen, res, rlen)
#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 */
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