mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-11-27 23:53:26 +08:00
f60845fde2
groupaccess.c loginrec.c monitor.c monitor_wrap.c session.c sshd.c sshlogin.c uidswap.c openbsd-compat/bsd-cygwin_util.c openbsd-compat/getrrsetbyname-ldns.c openbsd-compat/port-aix.c openbsd-compat/port-linux.c] Replace portable-specific instances of xfree with the equivalent calls to free.
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/* $OpenBSD: cipher-ctr.c,v 1.11 2010/10/01 23:05:32 djm Exp $ */
|
|
/*
|
|
* Copyright (c) 2003 Markus Friedl <markus@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
#include "includes.h"
|
|
|
|
#ifndef OPENSSL_HAVE_EVPCTR
|
|
#include <sys/types.h>
|
|
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "log.h"
|
|
|
|
/* compatibility with old or broken OpenSSL versions */
|
|
#include "openbsd-compat/openssl-compat.h"
|
|
|
|
#ifndef USE_BUILTIN_RIJNDAEL
|
|
#include <openssl/aes.h>
|
|
#endif
|
|
|
|
struct ssh_aes_ctr_ctx
|
|
{
|
|
AES_KEY aes_ctx;
|
|
u_char aes_counter[AES_BLOCK_SIZE];
|
|
};
|
|
|
|
/*
|
|
* increment counter 'ctr',
|
|
* the counter is of size 'len' bytes and stored in network-byte-order.
|
|
* (LSB at ctr[len-1], MSB at ctr[0])
|
|
*/
|
|
static void
|
|
ssh_ctr_inc(u_char *ctr, size_t len)
|
|
{
|
|
int i;
|
|
|
|
for (i = len - 1; i >= 0; i--)
|
|
if (++ctr[i]) /* continue on overflow */
|
|
return;
|
|
}
|
|
|
|
static int
|
|
ssh_aes_ctr(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
|
|
LIBCRYPTO_EVP_INL_TYPE len)
|
|
{
|
|
struct ssh_aes_ctr_ctx *c;
|
|
size_t n = 0;
|
|
u_char buf[AES_BLOCK_SIZE];
|
|
|
|
if (len == 0)
|
|
return (1);
|
|
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL)
|
|
return (0);
|
|
|
|
while ((len--) > 0) {
|
|
if (n == 0) {
|
|
AES_encrypt(c->aes_counter, buf, &c->aes_ctx);
|
|
ssh_ctr_inc(c->aes_counter, AES_BLOCK_SIZE);
|
|
}
|
|
*(dest++) = *(src++) ^ buf[n];
|
|
n = (n + 1) % AES_BLOCK_SIZE;
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
ssh_aes_ctr_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
|
|
int enc)
|
|
{
|
|
struct ssh_aes_ctr_ctx *c;
|
|
|
|
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
|
|
c = xmalloc(sizeof(*c));
|
|
EVP_CIPHER_CTX_set_app_data(ctx, c);
|
|
}
|
|
if (key != NULL)
|
|
AES_set_encrypt_key(key, EVP_CIPHER_CTX_key_length(ctx) * 8,
|
|
&c->aes_ctx);
|
|
if (iv != NULL)
|
|
memcpy(c->aes_counter, iv, AES_BLOCK_SIZE);
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
ssh_aes_ctr_cleanup(EVP_CIPHER_CTX *ctx)
|
|
{
|
|
struct ssh_aes_ctr_ctx *c;
|
|
|
|
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
|
|
memset(c, 0, sizeof(*c));
|
|
free(c);
|
|
EVP_CIPHER_CTX_set_app_data(ctx, NULL);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
void
|
|
ssh_aes_ctr_iv(EVP_CIPHER_CTX *evp, int doset, u_char * iv, size_t len)
|
|
{
|
|
struct ssh_aes_ctr_ctx *c;
|
|
|
|
if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL)
|
|
fatal("ssh_aes_ctr_iv: no context");
|
|
if (doset)
|
|
memcpy(c->aes_counter, iv, len);
|
|
else
|
|
memcpy(iv, c->aes_counter, len);
|
|
}
|
|
|
|
const EVP_CIPHER *
|
|
evp_aes_128_ctr(void)
|
|
{
|
|
static EVP_CIPHER aes_ctr;
|
|
|
|
memset(&aes_ctr, 0, sizeof(EVP_CIPHER));
|
|
aes_ctr.nid = NID_undef;
|
|
aes_ctr.block_size = AES_BLOCK_SIZE;
|
|
aes_ctr.iv_len = AES_BLOCK_SIZE;
|
|
aes_ctr.key_len = 16;
|
|
aes_ctr.init = ssh_aes_ctr_init;
|
|
aes_ctr.cleanup = ssh_aes_ctr_cleanup;
|
|
aes_ctr.do_cipher = ssh_aes_ctr;
|
|
#ifndef SSH_OLD_EVP
|
|
aes_ctr.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
|
|
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
|
|
#endif
|
|
return (&aes_ctr);
|
|
}
|
|
|
|
#endif /* OPENSSL_HAVE_EVPCTR */
|