postgresql/contrib/pgcrypto/openssl.c
Bruce Momjian 728fa75edc OpenSSL 0.9.6g in Debian/unstable stopped working with pgcrypto. This
is pgcrypto bug as it assumed too much about inner workings of OpenSSL.

Following patch stops pgcrypto using EVP* functions for ciphers and lets
it manage ciphers itself.

This patch supports Blowfish, DES and CAST5 algorithms.

Marko Kreen
2002-11-15 02:54:44 +00:00

541 lines
11 KiB
C

/*
* openssl.c
* Wrapper for OpenSSL library.
*
* 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: openssl.c,v 1.11 2002/11/15 02:54:44 momjian Exp $
*/
#include <postgres.h>
#include "px.h"
#include <openssl/evp.h>
/*
* Hashes
*/
static unsigned
digest_result_size(PX_MD * h)
{
return EVP_MD_CTX_size((EVP_MD_CTX *) h->p.ptr);
}
static unsigned
digest_block_size(PX_MD * h)
{
return EVP_MD_CTX_block_size((EVP_MD_CTX *) h->p.ptr);
}
static void
digest_reset(PX_MD * h)
{
EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
const EVP_MD *md;
md = EVP_MD_CTX_md(ctx);
EVP_DigestInit(ctx, md);
}
static void
digest_update(PX_MD * h, const uint8 *data, unsigned dlen)
{
EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
EVP_DigestUpdate(ctx, data, dlen);
}
static void
digest_finish(PX_MD * h, uint8 *dst)
{
EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
EVP_DigestFinal(ctx, dst, NULL);
}
static void
digest_free(PX_MD * h)
{
EVP_MD_CTX *ctx = (EVP_MD_CTX *) h->p.ptr;
px_free(ctx);
px_free(h);
}
static int px_openssl_initialized = 0;
/* PUBLIC functions */
int
px_find_digest(const char *name, PX_MD ** res)
{
const EVP_MD *md;
EVP_MD_CTX *ctx;
PX_MD *h;
if (!px_openssl_initialized)
{
px_openssl_initialized = 1;
OpenSSL_add_all_algorithms();
}
md = EVP_get_digestbyname(name);
if (md == NULL)
return -1;
ctx = px_alloc(sizeof(*ctx));
EVP_DigestInit(ctx, md);
h = px_alloc(sizeof(*h));
h->result_size = digest_result_size;
h->block_size = digest_block_size;
h->reset = digest_reset;
h->update = digest_update;
h->finish = digest_finish;
h->free = digest_free;
h->p.ptr = (void *) ctx;
*res = h;
return 0;
}
/*
* Ciphers
*
* The problem with OpenSSL is that the EVP* family
* of functions does not allow enough flexibility
* and forces some of the parameters (keylen,
* padding) to SSL defaults.
*
* So need to manage ciphers ourselves.
*/
struct ossl_cipher {
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);
int block_size;
int max_key_size;
int stream_cipher;
};
typedef struct
{
union
{
struct
{
BF_KEY key;
int num;
} bf;
struct
{
des_key_schedule key_schedule;
} des;
CAST_KEY cast_key;
} u;
uint8 key[EVP_MAX_KEY_LENGTH];
uint8 iv[EVP_MAX_IV_LENGTH];
unsigned klen;
unsigned init;
const struct ossl_cipher *ciph;
} ossldata;
/* generic */
static unsigned
gen_ossl_block_size(PX_Cipher * c)
{
ossldata *od = (ossldata *) c->ptr;
return od->ciph->block_size;
}
static unsigned
gen_ossl_key_size(PX_Cipher * c)
{
ossldata *od = (ossldata *) c->ptr;
return od->ciph->max_key_size;
}
static unsigned
gen_ossl_iv_size(PX_Cipher * c)
{
unsigned ivlen;
ossldata *od = (ossldata *) c->ptr;
ivlen = od->ciph->block_size;
return ivlen;
}
static void
gen_ossl_free(PX_Cipher * c)
{
ossldata *od = (ossldata *) c->ptr;
memset(od, 0, sizeof(*od));
pfree(od);
pfree(c);
}
/* Blowfish */
static int
bf_init(PX_Cipher * c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
BF_set_key(&od->u.bf.key, klen, key);
if (iv)
memcpy(od->iv, iv, BF_BLOCK);
else
memset(od->iv, 0, BF_BLOCK);
od->u.bf.num = 0;
return 0;
}
static int
bf_ecb_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
unsigned i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
BF_ecb_encrypt(data + i * bs, res + i * bs, &od->u.bf.key, BF_ENCRYPT);
return 0;
}
static int
bf_ecb_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
unsigned bs = gen_ossl_block_size(c),
i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
BF_ecb_encrypt(data + i * bs, res + i * bs, &od->u.bf.key, BF_DECRYPT);
return 0;
}
static int
bf_cbc_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
ossldata *od = c->ptr;
BF_cbc_encrypt(data, res, dlen, &od->u.bf.key, od->iv, BF_ENCRYPT);
return 0;
}
static int
bf_cbc_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
ossldata *od = c->ptr;
BF_cbc_encrypt(data, res, dlen, &od->u.bf.key, od->iv, BF_DECRYPT);
return 0;
}
static int
bf_cfb64_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
ossldata *od = c->ptr;
BF_cfb64_encrypt(data, res, dlen, &od->u.bf.key, od->iv,
&od->u.bf.num, BF_ENCRYPT);
return 0;
}
static int
bf_cfb64_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
ossldata *od = c->ptr;
BF_cfb64_encrypt(data, res, dlen, &od->u.bf.key, od->iv,
&od->u.bf.num, BF_DECRYPT);
return 0;
}
/* DES */
static int
ossl_des_init(PX_Cipher * c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
des_cblock xkey;
memset(&xkey, 0, sizeof(xkey));
memcpy(&xkey, key, klen > 8 ? 8 : klen);
des_set_key(&xkey, od->u.des.key_schedule);
memset(&xkey, 0, sizeof(xkey));
if (iv)
memcpy(od->iv, iv, 8);
else
memset(od->iv, 0, 8);
return 0;
}
static int
ossl_des_ecb_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen,
uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
unsigned i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
des_ecb_encrypt((des_cblock*)(data + i * bs),
(des_cblock*)(res + i * bs),
od->u.des.key_schedule, 1);
return 0;
}
static int
ossl_des_ecb_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen,
uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
unsigned i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
des_ecb_encrypt((des_cblock*)(data + i * bs),
(des_cblock*)(res + i * bs),
od->u.des.key_schedule, 0);
return 0;
}
static int
ossl_des_cbc_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen,
uint8 *res)
{
ossldata *od = c->ptr;
des_ncbc_encrypt(data, res, dlen, od->u.des.key_schedule,
(des_cblock*)od->iv, 1);
return 0;
}
static int
ossl_des_cbc_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen,
uint8 *res)
{
ossldata *od = c->ptr;
des_ncbc_encrypt(data, res, dlen, od->u.des.key_schedule,
(des_cblock*)od->iv, 0);
return 0;
}
/* CAST5 */
static int
ossl_cast_init(PX_Cipher * c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
unsigned bs = gen_ossl_block_size(c);
CAST_set_key(&od->u.cast_key, klen, key);
if (iv)
memcpy(od->iv, iv, bs);
else
memset(od->iv, 0, bs);
return 0;
}
static int
ossl_cast_ecb_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
ossldata *od = c->ptr;
const uint8 *end = data + dlen - bs;
for (; data <= end; data += bs, res += bs)
CAST_ecb_encrypt(data, res, &od->u.cast_key, CAST_ENCRYPT);
return 0;
}
static int
ossl_cast_ecb_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
ossldata *od = c->ptr;
const uint8 *end = data + dlen - bs;
for (; data <= end; data += bs, res += bs)
CAST_ecb_encrypt(data, res, &od->u.cast_key, CAST_DECRYPT);
return 0;
}
static int
ossl_cast_cbc_encrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
ossldata *od = c->ptr;
CAST_cbc_encrypt(data, res, dlen, &od->u.cast_key, od->iv, CAST_ENCRYPT);
return 0;
}
static int
ossl_cast_cbc_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen, uint8 *res)
{
ossldata *od = c->ptr;
CAST_cbc_encrypt(data, res, dlen, &od->u.cast_key, od->iv, CAST_DECRYPT);
return 0;
}
/*
* aliases
*/
static PX_Alias ossl_aliases[] = {
{"bf", "bf-cbc"},
{"blowfish", "bf-cbc"},
{"blowfish-cbc", "bf-cbc"},
{"blowfish-ecb", "bf-ecb"},
{"blowfish-cfb", "bf-cfb"},
{"des", "des-cbc"},
{"cast5", "cast5-cbc"},
{NULL}
};
static const struct ossl_cipher ossl_bf_cbc = {
bf_init, bf_cbc_encrypt, bf_cbc_decrypt,
64/8, 448/8, 0
};
static const struct ossl_cipher ossl_bf_ecb = {
bf_init, bf_ecb_encrypt, bf_ecb_decrypt,
64/8, 448/8, 0
};
static const struct ossl_cipher ossl_bf_cfb = {
bf_init, bf_cfb64_encrypt, bf_cfb64_decrypt,
64/8, 448/8, 1
};
static const struct ossl_cipher ossl_des_ecb = {
ossl_des_init, ossl_des_ecb_encrypt, ossl_des_ecb_decrypt,
64/8, 64/8, 0
};
static const struct ossl_cipher ossl_des_cbc = {
ossl_des_init, ossl_des_cbc_encrypt, ossl_des_cbc_decrypt,
64/8, 64/8, 0
};
static const struct ossl_cipher ossl_cast_ecb = {
ossl_cast_init, ossl_cast_ecb_encrypt, ossl_cast_ecb_decrypt,
64/8, 128/8, 0
};
static const struct ossl_cipher ossl_cast_cbc = {
ossl_cast_init, ossl_cast_cbc_encrypt, ossl_cast_cbc_decrypt,
64/8, 128/8, 0
};
/*
* Special handlers
*/
static const struct
{
const char *name;
const struct ossl_cipher *ciph;
} ossl_cipher_types[] =
{
{
"bf-cbc", &ossl_bf_cbc
},
{
"bf-ecb", &ossl_bf_ecb
},
{
"bf-cfb", &ossl_bf_cfb
},
{
"des-ecb", &ossl_des_ecb
},
{
"des-cbc", &ossl_des_cbc
},
{
"cast5-ecb", &ossl_cast_ecb
},
{
"cast5-cbc", &ossl_cast_cbc
},
{
NULL
}
};
/* PUBLIC functions */
int
px_find_cipher(const char *name, PX_Cipher ** res)
{
unsigned i;
PX_Cipher *c = NULL,
*csrc;
ossldata *od;
const struct ossl_cipher *ossl_ciph = NULL;
name = px_resolve_alias(ossl_aliases, name);
for (i = 0; ossl_cipher_types[i].name; i++) {
if (!strcmp(ossl_cipher_types[i].name, name)) {
ossl_ciph = ossl_cipher_types[i].ciph;
break;
}
}
if (ossl_ciph == NULL)
return -1;
od = px_alloc(sizeof(*od));
memset(od, 0, sizeof(*od));
od->ciph = ossl_ciph;
csrc = NULL;
c = px_alloc(sizeof(*c));
c->block_size = gen_ossl_block_size;
c->key_size = gen_ossl_key_size;
c->iv_size = gen_ossl_iv_size;
c->free = gen_ossl_free;
c->init = ossl_ciph->init;
c->encrypt = ossl_ciph->encrypt;
c->decrypt = ossl_ciph->decrypt;
c->ptr = od;
*res = c;
return 0;
}