+++ /dev/null
-/* $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"
-
-#if defined(WITH_OPENSSL) && !defined(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 /* defined(WITH_OPENSSL) && !defined(OPENSSL_HAVE_EVPCTR) */
return SSH_ERR_LIBCRYPTO_ERROR;
if ((size_t)evplen != len)
return SSH_ERR_INVALID_ARGUMENT;
-#ifndef OPENSSL_HAVE_EVPCTR
- if (c->evptype == evp_aes_128_ctr)
- ssh_aes_ctr_iv(cc->evp, 0, iv, len);
- else
-#endif
if (cipher_authlen(c)) {
if (!EVP_CIPHER_CTX_ctrl(cc->evp, EVP_CTRL_GCM_IV_GEN,
len, iv))
return SSH_ERR_LIBCRYPTO_ERROR;
if ((size_t)evplen != len)
return SSH_ERR_INVALID_ARGUMENT;
-#ifndef OPENSSL_HAVE_EVPCTR
- /* XXX iv arg is const, but ssh_aes_ctr_iv isn't */
- if (c->evptype == evp_aes_128_ctr)
- ssh_aes_ctr_iv(cc->evp, 1, (u_char *)iv, evplen);
- else
-#endif
if (cipher_authlen(c)) {
/* XXX iv arg is const, but EVP_CIPHER_CTX_ctrl isn't */
if (!EVP_CIPHER_CTX_ctrl(cc->evp,
projects / thirdparty / openssh-portable.git / commitdiff
