1 files changed, 171 insertions, 0 deletions

diff --git a/cipher-3des1.c b/cipher-3des1.c
new file mode 100644
index 000000000..f9a352397
--- /dev/null
+++ b/cipher-3des1.c
@@ -0,0 +1,171 @@
+/*
+ * 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-3des1.c,v 1.1 2003/05/15 03:08:29 markus Exp $");
+
+#include <openssl/evp.h>
+#include "xmalloc.h"
+#include "log.h"
+
+/*
+ * This is used by SSH1:
+ *
+ * What kind of triple DES are these 2 routines?
+ *
+ * Why is there a redundant initialization vector?
+ *
+ * If only iv3 was used, then, this would till effect have been
+ * outer-cbc. However, there is also a private iv1 == iv2 which
+ * perhaps makes differential analysis easier. On the other hand, the
+ * private iv1 probably makes the CRC-32 attack ineffective. This is a
+ * result of that there is no longer any known iv1 to use when
+ * choosing the X block.
+ */
+struct ssh1_3des_ctx
+{
+        EVP_CIPHER_CTX  k1, k2, k3;
+};
+
+const EVP_CIPHER * evp_ssh1_3des(void);
+void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
+
+static int
+ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
+    int enc)
+{
+        struct ssh1_3des_ctx *c;
+        u_char *k1, *k2, *k3;
+
+        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)
+                return (1);
+        if (enc == -1)
+                enc = ctx->encrypt;
+        k1 = k2 = k3 = (u_char *) key;
+        k2 += 8;
+        if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) {
+                if (enc)
+                        k3 += 16;
+                else
+                        k1 += 16;
+        }
+        EVP_CIPHER_CTX_init(&c->k1);
+        EVP_CIPHER_CTX_init(&c->k2);
+        EVP_CIPHER_CTX_init(&c->k3);
+#ifdef SSH_OLD_EVP
+        EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc);
+        EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc);
+        EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc);
+#else
+        if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 ||
+            EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 ||
+            EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) {
+                memset(c, 0, sizeof(*c));
+                xfree(c);
+                EVP_CIPHER_CTX_set_app_data(ctx, NULL);
+                return (0);
+        }
+#endif
+        return (1);
+}
+
+static int
+ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len)
+{
+        struct ssh1_3des_ctx *c;
+
+        if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
+                error("ssh1_3des_cbc: no context");
+                return (0);
+        }
+#ifdef SSH_OLD_EVP
+        EVP_Cipher(&c->k1, dest, (u_char *)src, len);
+        EVP_Cipher(&c->k2, dest, dest, len);
+        EVP_Cipher(&c->k3, dest, dest, len);
+#else
+        if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 ||
+            EVP_Cipher(&c->k2, dest, dest, len) == 0 ||
+            EVP_Cipher(&c->k3, dest, dest, len) == 0)
+                return (0);
+#endif
+        return (1);
+}
+
+static int
+ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx)
+{
+        struct ssh1_3des_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
+ssh1_3des_iv(EVP_CIPHER_CTX *evp, int doset, u_char *iv, int len)
+{
+        struct ssh1_3des_ctx *c;
+
+        if (len != 24)
+                fatal("%s: bad 3des iv length: %d", __func__, len);
+        if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL)
+                fatal("%s: no 3des context", __func__);
+        if (doset) {
+                debug3("%s: Installed 3DES IV", __func__);
+                memcpy(c->k1.iv, iv, 8);
+                memcpy(c->k2.iv, iv + 8, 8);
+                memcpy(c->k3.iv, iv + 16, 8);
+        } else {
+                debug3("%s: Copying 3DES IV", __func__);
+                memcpy(iv, c->k1.iv, 8);
+                memcpy(iv + 8, c->k2.iv, 8);
+                memcpy(iv + 16, c->k3.iv, 8);
+        }
+}
+
+const EVP_CIPHER *
+evp_ssh1_3des(void)
+{
+        static EVP_CIPHER ssh1_3des;
+
+        memset(&ssh1_3des, 0, sizeof(EVP_CIPHER));
+        ssh1_3des.nid = NID_undef;
+        ssh1_3des.block_size = 8;
+        ssh1_3des.iv_len = 0;
+        ssh1_3des.key_len = 16;
+        ssh1_3des.init = ssh1_3des_init;
+        ssh1_3des.cleanup = ssh1_3des_cleanup;
+        ssh1_3des.do_cipher = ssh1_3des_cbc;
+#ifndef SSH_OLD_EVP
+        ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH;
+#endif
+        return (&ssh1_3des);
+}