--- /dev/null
+/*
+ * Copyright (c) 2003 Markus Friedl. 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 ``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 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.
+ */
+#include "includes.h"
+RCSID("$OpenBSD: cipher-ctr.c,v 1.1 2003/05/17 04:27:52 markus Exp $");
+
+#include <openssl/evp.h>
+
+#include "log.h"
+#include "xmalloc.h"
+
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
+#include "rijndael.h"
+#define AES_KEY rijndael_ctx
+#define AES_BLOCK_SIZE 16
+#define AES_encrypt(a, b, c) rijndael_encrypt(c, a, b)
+#define AES_set_encrypt_key(a, b, c) rijndael_set_key(c, (char *)a, b, 1)
+#else
+#include <openssl/aes.h>
+#endif
+
+const EVP_CIPHER *evp_aes_128_ctr(void);
+void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
+
+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, u_int 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,
+ u_int len)
+{
+ struct ssh_aes_ctr_ctx *c;
+ u_int 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, ctx->key_len * 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));
+ xfree(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, u_int 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;
+ aes_ctr.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
+ EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
+ return (&aes_ctr);
+}
*/
#include "includes.h"
-RCSID("$OpenBSD: cipher.c,v 1.64 2003/05/15 03:08:29 markus Exp $");
+RCSID("$OpenBSD: cipher.c,v 1.65 2003/05/17 04:27:52 markus Exp $");
#include "xmalloc.h"
#include "log.h"
extern const EVP_CIPHER *evp_ssh1_bf(void);
extern const EVP_CIPHER *evp_ssh1_3des(void);
extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
+extern const EVP_CIPHER *evp_aes_128_ctr(void);
+extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
struct Cipher {
char *name;
{ "rijndael-cbc@lysator.liu.se",
SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
#endif
+ { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, evp_aes_128_ctr },
+ { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, evp_aes_128_ctr },
+ { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, evp_aes_128_ctr },
{ NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL }
};
ssh_rijndael_iv(&cc->evp, 0, iv, len);
else
#endif
+ if (c->evptype == evp_aes_128_ctr)
+ ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
+ else
memcpy(iv, cc->evp.iv, len);
break;
case SSH_CIPHER_3DES:
ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
else
#endif
+ if (c->evptype == evp_aes_128_ctr)
+ ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
+ else
memcpy(cc->evp.iv, iv, evplen);
break;
case SSH_CIPHER_3DES:
-/* $OpenBSD: myproposal.h,v 1.14 2002/04/03 09:26:11 markus Exp $ */
+/* $OpenBSD: myproposal.h,v 1.15 2003/05/17 04:27:52 markus Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
#define KEX_DEFAULT_PK_ALG "ssh-rsa,ssh-dss"
#define KEX_DEFAULT_ENCRYPT \
"aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour," \
- "aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se"
+ "aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se," \
+ "aes128-ctr,aes192-ctr,aes256-ctr"
#define KEX_DEFAULT_MAC \
"hmac-md5,hmac-sha1,hmac-ripemd160," \
"hmac-ripemd160@openssh.com," \
andersk / openssh.git / commitdiff
