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/*
* 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.
*
* contrib/pgcrypto/openssl.c
*/
#include "postgres.h"
#include "px.h"
#include <openssl/evp.h>
#include <openssl/blowfish.h>
#include <openssl/cast.h>
#include <openssl/des.h>
#include <openssl/rand.h>
#include <openssl/err.h>
/*
* Max lengths we might want to handle.
*/
#define MAX_KEY (512/8)
#define MAX_IV (128/8)
/*
* Compatibility with OpenSSL 0.9.6
*
* It needs AES and newer DES and digest API.
*/
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
/*
* Nothing needed for OpenSSL 0.9.7+
*/
#include <openssl/aes.h>
#else /* old OPENSSL */
/*
* Emulate OpenSSL AES.
*/
#include "rijndael.c"
#define AES_ENCRYPT 1
#define AES_DECRYPT 0
#define AES_KEY rijndael_ctx
static int
AES_set_encrypt_key(const uint8 *key, int kbits, AES_KEY *ctx)
{
aes_set_key(ctx, key, kbits, 1);
return 0;
}
static int
AES_set_decrypt_key(const uint8 *key, int kbits, AES_KEY *ctx)
{
aes_set_key(ctx, key, kbits, 0);
return 0;
}
static void
AES_ecb_encrypt(const uint8 *src, uint8 *dst, AES_KEY *ctx, int enc)
{
memcpy(dst, src, 16);
if (enc)
aes_ecb_encrypt(ctx, dst, 16);
else
aes_ecb_decrypt(ctx, dst, 16);
}
static void
AES_cbc_encrypt(const uint8 *src, uint8 *dst, int len, AES_KEY *ctx, uint8 *iv, int enc)
{
memcpy(dst, src, len);
if (enc)
{
aes_cbc_encrypt(ctx, iv, dst, len);
memcpy(iv, dst + len - 16, 16);
}
else
{
aes_cbc_decrypt(ctx, iv, dst, len);
memcpy(iv, src + len - 16, 16);
}
}
/*
* Emulate DES_* API
*/
#define DES_key_schedule des_key_schedule
#define DES_cblock des_cblock
#define DES_set_key(k, ks) \
des_set_key((k), *(ks))
#define DES_ecb_encrypt(i, o, k, e) \
des_ecb_encrypt((i), (o), *(k), (e))
#define DES_ncbc_encrypt(i, o, l, k, iv, e) \
des_ncbc_encrypt((i), (o), (l), *(k), (iv), (e))
#define DES_ecb3_encrypt(i, o, k1, k2, k3, e) \
des_ecb3_encrypt((des_cblock *)(i), (des_cblock *)(o), \
*(k1), *(k2), *(k3), (e))
#define DES_ede3_cbc_encrypt(i, o, l, k1, k2, k3, iv, e) \
des_ede3_cbc_encrypt((i), (o), \
(l), *(k1), *(k2), *(k3), (iv), (e))
/*
* Emulate newer digest API.
*/
static void
EVP_MD_CTX_init(EVP_MD_CTX *ctx)
{
memset(ctx, 0, sizeof(*ctx));
}
static int
EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
{
px_memset(ctx, 0, sizeof(*ctx));
return 1;
}
static int
EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *md, void *engine)
{
EVP_DigestInit(ctx, md);
return 1;
}
static int
EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *res, unsigned int *len)
{
EVP_DigestFinal(ctx, res, len);
return 1;
}
#endif /* old OpenSSL */
/*
* Provide SHA2 for older OpenSSL < 0.9.8
*/
#if OPENSSL_VERSION_NUMBER < 0x00908000L
#include "sha2.c"
#include "internal-sha2.c"
typedef void (*init_f) (PX_MD *md);
static int
compat_find_digest(const char *name, PX_MD **res)
{
init_f init = NULL;
if (pg_strcasecmp(name, "sha224") == 0)
init = init_sha224;
else if (pg_strcasecmp(name, "sha256") == 0)
init = init_sha256;
else if (pg_strcasecmp(name, "sha384") == 0)
init = init_sha384;
else if (pg_strcasecmp(name, "sha512") == 0)
init = init_sha512;
else
return PXE_NO_HASH;
*res = px_alloc(sizeof(PX_MD));
init(*res);
return 0;
}
#else
#define compat_find_digest(name, res) (PXE_NO_HASH)
#endif
/*
* Hashes
*/
typedef struct OSSLDigest
{
const EVP_MD *algo;
EVP_MD_CTX ctx;
} OSSLDigest;
static unsigned
digest_result_size(PX_MD *h)
{
OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
return EVP_MD_CTX_size(&digest->ctx);
}
static unsigned
digest_block_size(PX_MD *h)
{
OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
return EVP_MD_CTX_block_size(&digest->ctx);
}
static void
digest_reset(PX_MD *h)
{
OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
EVP_DigestInit_ex(&digest->ctx, digest->algo, NULL);
}
static void
digest_update(PX_MD *h, const uint8 *data, unsigned dlen)
{
OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
EVP_DigestUpdate(&digest->ctx, data, dlen);
}
static void
digest_finish(PX_MD *h, uint8 *dst)
{
OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
EVP_DigestFinal_ex(&digest->ctx, dst, NULL);
}
static void
digest_free(PX_MD *h)
{
OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
EVP_MD_CTX_cleanup(&digest->ctx);
px_free(digest);
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;
PX_MD *h;
OSSLDigest *digest;
if (!px_openssl_initialized)
{
px_openssl_initialized = 1;
OpenSSL_add_all_algorithms();
}
md = EVP_get_digestbyname(name);
if (md == NULL)
return compat_find_digest(name, res);
digest = px_alloc(sizeof(*digest));
digest->algo = md;
EVP_MD_CTX_init(&digest->ctx);
if (EVP_DigestInit_ex(&digest->ctx, digest->algo, NULL) == 0)
return -1;
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 *) digest;
*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;
struct
{
DES_key_schedule k1,
k2,
k3;
} des3;
CAST_KEY cast_key;
AES_KEY aes_key;
} u;
uint8 key[MAX_KEY];
uint8 iv[MAX_IV];
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;
px_memset(od, 0, sizeof(*od));
px_free(od);
px_free(c);
}
/* Blowfish */
/*
* Check if strong crypto is supported. Some openssl installations
* support only short keys and unfortunately BF_set_key does not return any
* error value. This function tests if is possible to use strong key.
*/
static int
bf_check_supported_key_len(void)
{
static const uint8 key[56] = {
0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87, 0x78, 0x69,
0x5a, 0x4b, 0x3c, 0x2d, 0x1e, 0x0f, 0x00, 0x11, 0x22, 0x33,
0x44, 0x55, 0x66, 0x77, 0x04, 0x68, 0x91, 0x04, 0xc2, 0xfd,
0x3b, 0x2f, 0x58, 0x40, 0x23, 0x64, 0x1a, 0xba, 0x61, 0x76,
0x1f, 0x1f, 0x1f, 0x1f, 0x0e, 0x0e, 0x0e, 0x0e, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
static const uint8 data[8] = {0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};
static const uint8 res[8] = {0xc0, 0x45, 0x04, 0x01, 0x2e, 0x4e, 0x1f, 0x53};
static uint8 out[8];
BF_KEY bf_key;
/* encrypt with 448bits key and verify output */
BF_set_key(&bf_key, 56, key);
BF_ecb_encrypt(data, out, &bf_key, BF_ENCRYPT);
if (memcmp(out, res, 8) != 0)
return 0; /* Output does not match -> strong cipher is
* not supported */
return 1;
}
static int
bf_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
static int bf_is_strong = -1;
/*
* Test if key len is supported. BF_set_key silently cut large keys and it
* could be a problem when user transfer crypted data from one server
* to another.
*/
if (bf_is_strong == -1)
bf_is_strong = bf_check_supported_key_len();
if (!bf_is_strong && klen > 16)
return PXE_KEY_TOO_BIG;
/* Key len is supported. We can use it. */
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;
}
/* DES3 */
static int
ossl_des3_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
DES_cblock xkey1,
xkey2,
xkey3;
memset(&xkey1, 0, sizeof(xkey1));
memset(&xkey2, 0, sizeof(xkey2));
memset(&xkey3, 0, sizeof(xkey3));
memcpy(&xkey1, key, klen > 8 ? 8 : klen);
if (klen > 8)
memcpy(&xkey2, key + 8, (klen - 8) > 8 ? 8 : (klen - 8));
if (klen > 16)
memcpy(&xkey3, key + 16, (klen - 16) > 8 ? 8 : (klen - 16));
DES_set_key(&xkey1, &od->u.des3.k1);
DES_set_key(&xkey2, &od->u.des3.k2);
DES_set_key(&xkey3, &od->u.des3.k3);
memset(&xkey1, 0, sizeof(xkey1));
memset(&xkey2, 0, sizeof(xkey2));
memset(&xkey3, 0, sizeof(xkey3));
if (iv)
memcpy(od->iv, iv, 8);
else
memset(od->iv, 0, 8);
return 0;
}
static int
ossl_des3_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_ecb3_encrypt((void *) (data + i * bs), (void *) (res + i * bs),
&od->u.des3.k1, &od->u.des3.k2, &od->u.des3.k3, 1);
return 0;
}
static int
ossl_des3_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_ecb3_encrypt((void *) (data + i * bs), (void *) (res + i * bs),
&od->u.des3.k1, &od->u.des3.k2, &od->u.des3.k3, 0);
return 0;
}
static int
ossl_des3_cbc_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
uint8 *res)
{
ossldata *od = c->ptr;
DES_ede3_cbc_encrypt(data, res, dlen,
&od->u.des3.k1, &od->u.des3.k2, &od->u.des3.k3,
(DES_cblock *) od->iv, 1);
return 0;
}
static int
ossl_des3_cbc_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
uint8 *res)
{
ossldata *od = c->ptr;
DES_ede3_cbc_encrypt(data, res, dlen,
&od->u.des3.k1, &od->u.des3.k2, &od->u.des3.k3,
(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;
}
/* AES */
static int
ossl_aes_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
unsigned bs = gen_ossl_block_size(c);
if (klen <= 128 / 8)
od->klen = 128 / 8;
else if (klen <= 192 / 8)
od->klen = 192 / 8;
else if (klen <= 256 / 8)
od->klen = 256 / 8;
else
return PXE_KEY_TOO_BIG;
memcpy(od->key, key, klen);
if (iv)
memcpy(od->iv, iv, bs);
else
memset(od->iv, 0, bs);
return 0;
}
static int
ossl_aes_key_init(ossldata *od, int type)
{
int err;
/*
* Strong key support could be missing on some openssl installations. We
* must check return value from set key function.
*/
if (type == AES_ENCRYPT)
err = AES_set_encrypt_key(od->key, od->klen * 8, &od->u.aes_key);
else
err = AES_set_decrypt_key(od->key, od->klen * 8, &od->u.aes_key);
if (err == 0)
{
od->init = 1;
return 0;
}
od->init = 0;
return PXE_KEY_TOO_BIG;
}
static int
ossl_aes_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;
int err;
if (!od->init)
if ((err = ossl_aes_key_init(od, AES_ENCRYPT)) != 0)
return err;
for (; data <= end; data += bs, res += bs)
AES_ecb_encrypt(data, res, &od->u.aes_key, AES_ENCRYPT);
return 0;
}
static int
ossl_aes_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;
int err;
if (!od->init)
if ((err = ossl_aes_key_init(od, AES_DECRYPT)) != 0)
return err;
for (; data <= end; data += bs, res += bs)
AES_ecb_encrypt(data, res, &od->u.aes_key, AES_DECRYPT);
return 0;
}
static int
ossl_aes_cbc_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
uint8 *res)
{
ossldata *od = c->ptr;
int err;
if (!od->init)
if ((err = ossl_aes_key_init(od, AES_ENCRYPT)) != 0)
return err;
AES_cbc_encrypt(data, res, dlen, &od->u.aes_key, od->iv, AES_ENCRYPT);
return 0;
}
static int
ossl_aes_cbc_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
uint8 *res)
{
ossldata *od = c->ptr;
int err;
if (!od->init)
if ((err = ossl_aes_key_init(od, AES_DECRYPT)) != 0)
return err;
AES_cbc_encrypt(data, res, dlen, &od->u.aes_key, od->iv, AES_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"},
{"3des", "des3-cbc"},
{"3des-ecb", "des3-ecb"},
{"3des-cbc", "des3-cbc"},
{"cast5", "cast5-cbc"},
{"aes", "aes-cbc"},
{"rijndael", "aes-cbc"},
{"rijndael-cbc", "aes-cbc"},
{"rijndael-ecb", "aes-ecb"},
{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_des3_ecb = {
ossl_des3_init, ossl_des3_ecb_encrypt, ossl_des3_ecb_decrypt,
64 / 8, 192 / 8, 0
};
static const struct ossl_cipher ossl_des3_cbc = {
ossl_des3_init, ossl_des3_cbc_encrypt, ossl_des3_cbc_decrypt,
64 / 8, 192 / 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
};
static const struct ossl_cipher ossl_aes_ecb = {
ossl_aes_init, ossl_aes_ecb_encrypt, ossl_aes_ecb_decrypt,
128 / 8, 256 / 8, 0
};
static const struct ossl_cipher ossl_aes_cbc = {
ossl_aes_init, ossl_aes_cbc_encrypt, ossl_aes_cbc_decrypt,
128 / 8, 256 / 8, 0
};
/*
* Special handlers
*/
struct ossl_cipher_lookup
{
const char *name;
const struct ossl_cipher *ciph;
};
static const struct ossl_cipher_lookup 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},
{"des3-ecb", &ossl_des3_ecb},
{"des3-cbc", &ossl_des3_cbc},
{"cast5-ecb", &ossl_cast_ecb},
{"cast5-cbc", &ossl_cast_cbc},
{"aes-ecb", &ossl_aes_ecb},
{"aes-cbc", &ossl_aes_cbc},
{NULL}
};
/* PUBLIC functions */
int
px_find_cipher(const char *name, PX_Cipher **res)
{
const struct ossl_cipher_lookup *i;
PX_Cipher *c = NULL;
ossldata *od;
name = px_resolve_alias(ossl_aliases, name);
for (i = ossl_cipher_types; i->name; i++)
if (strcmp(i->name, name) == 0)
break;
if (i->name == NULL)
return PXE_NO_CIPHER;
od = px_alloc(sizeof(*od));
memset(od, 0, sizeof(*od));
od->ciph = i->ciph;
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 = od->ciph->init;
c->encrypt = od->ciph->encrypt;
c->decrypt = od->ciph->decrypt;
c->ptr = od;
*res = c;
return 0;
}
static int openssl_random_init = 0;
/*
* OpenSSL random should re-feeded occasionally. From /dev/urandom
* preferably.
*/
static void
init_openssl_rand(void)
{
if (RAND_get_rand_method() == NULL)
RAND_set_rand_method(RAND_SSLeay());
openssl_random_init = 1;
}
int
px_get_random_bytes(uint8 *dst, unsigned count)
{
int res;
if (!openssl_random_init)
init_openssl_rand();
res = RAND_bytes(dst, count);
if (res == 1)
return count;
return PXE_OSSL_RAND_ERROR;
}
int
px_get_pseudo_random_bytes(uint8 *dst, unsigned count)
{
int res;
if (!openssl_random_init)
init_openssl_rand();
res = RAND_pseudo_bytes(dst, count);
if (res == 0 || res == 1)
return count;
return PXE_OSSL_RAND_ERROR;
}
int
px_add_entropy(const uint8 *data, unsigned count)
{
/*
* estimate 0 bits
*/
RAND_add(data, count, 0);
return 0;
}
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