+/* $OpenBSD: cipher.c,v 1.82 2009/01/26 09:58:15 markus Exp $ */
/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 1999 Niels Provos. All rights reserved.
+ * Copyright (c) 1999, 2000 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.
+ */
-cipher.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
+#include "includes.h"
-Created: Wed Apr 19 17:41:39 1995 ylo
+#include <sys/types.h>
-*/
+#include <openssl/md5.h>
-#include "includes.h"
-RCSID("$Id$");
+#include <string.h>
+#include <stdarg.h>
-#include "ssh.h"
+#include "xmalloc.h"
+#include "log.h"
#include "cipher.h"
-#ifdef HAVE_OPENSSL
-#include <openssl/md5.h>
+/* compatibility with old or broken OpenSSL versions */
+#include "openbsd-compat/openssl-compat.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;
+ int number; /* for ssh1 only */
+ u_int block_size;
+ u_int key_len;
+ u_int discard_len;
+ u_int cbc_mode;
+ const EVP_CIPHER *(*evptype)(void);
+} ciphers[] = {
+ { "none", SSH_CIPHER_NONE, 8, 0, 0, 0, EVP_enc_null },
+ { "des", SSH_CIPHER_DES, 8, 8, 0, 1, EVP_des_cbc },
+ { "3des", SSH_CIPHER_3DES, 8, 16, 0, 1, evp_ssh1_3des },
+ { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, 1, evp_ssh1_bf },
+
+ { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 1, EVP_des_ede3_cbc },
+ { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, 1, EVP_bf_cbc },
+ { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, 1, EVP_cast5_cbc },
+ { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, 0, EVP_rc4 },
+ { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, 0, EVP_rc4 },
+ { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, 0, EVP_rc4 },
+ { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 1, EVP_aes_128_cbc },
+ { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 1, EVP_aes_192_cbc },
+ { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
+ { "rijndael-cbc@lysator.liu.se",
+ SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
+ { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, evp_aes_128_ctr },
+ { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, evp_aes_128_ctr },
+ { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, evp_aes_128_ctr },
+#ifdef USE_CIPHER_ACSS
+ { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, 0, EVP_acss },
#endif
-#ifdef HAVE_SSL
-#include <ssl/md5.h>
-#endif
-
-/*
- * What kind of tripple 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.
- */
-void
-SSH_3CBC_ENCRYPT(des_key_schedule ks1,
- des_key_schedule ks2, des_cblock *iv2,
- des_key_schedule ks3, des_cblock *iv3,
- void *dest, void *src,
- unsigned int len)
-{
- des_cblock iv1;
+ { NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, NULL }
+};
- memcpy(&iv1, iv2, 8);
+/*--*/
- des_cbc_encrypt(src, dest, len, ks1, &iv1, DES_ENCRYPT);
- memcpy(&iv1, dest + len - 8, 8);
+u_int
+cipher_blocksize(const Cipher *c)
+{
+ return (c->block_size);
+}
- des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_DECRYPT);
- memcpy(iv2, &iv1, 8); /* Note how iv1 == iv2 on entry and exit. */
+u_int
+cipher_keylen(const Cipher *c)
+{
+ return (c->key_len);
+}
- des_cbc_encrypt(dest, dest, len, ks3, iv3, DES_ENCRYPT);
- memcpy(iv3, dest + len - 8, 8);
+u_int
+cipher_get_number(const Cipher *c)
+{
+ return (c->number);
}
-void
-SSH_3CBC_DECRYPT(des_key_schedule ks1,
- des_key_schedule ks2, des_cblock *iv2,
- des_key_schedule ks3, des_cblock *iv3,
- void *dest, void *src,
- unsigned int len)
+u_int
+cipher_is_cbc(const Cipher *c)
{
- des_cblock iv1;
+ return (c->cbc_mode);
+}
- memcpy(&iv1, iv2, 8);
+u_int
+cipher_mask_ssh1(int client)
+{
+ u_int mask = 0;
+ mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
+ mask |= 1 << SSH_CIPHER_BLOWFISH;
+ if (client) {
+ mask |= 1 << SSH_CIPHER_DES;
+ }
+ return mask;
+}
- des_cbc_encrypt(src, dest, len, ks3, iv3, DES_DECRYPT);
- memcpy(iv3, src + len - 8, 8);
+Cipher *
+cipher_by_name(const char *name)
+{
+ Cipher *c;
+ for (c = ciphers; c->name != NULL; c++)
+ if (strcmp(c->name, name) == 0)
+ return c;
+ return NULL;
+}
- des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_ENCRYPT);
- memcpy(iv2, dest + len - 8, 8);
+Cipher *
+cipher_by_number(int id)
+{
+ Cipher *c;
+ for (c = ciphers; c->name != NULL; c++)
+ if (c->number == id)
+ return c;
+ return NULL;
+}
- des_cbc_encrypt(dest, dest, len, ks1, &iv1, DES_DECRYPT);
- /* memcpy(&iv1, iv2, 8); */ /* Note how iv1 == iv2 on entry and exit. */
+#define CIPHER_SEP ","
+int
+ciphers_valid(const char *names)
+{
+ Cipher *c;
+ char *cipher_list, *cp;
+ char *p;
+
+ if (names == NULL || strcmp(names, "") == 0)
+ return 0;
+ cipher_list = cp = xstrdup(names);
+ for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
+ (p = strsep(&cp, CIPHER_SEP))) {
+ c = cipher_by_name(p);
+ if (c == NULL || c->number != SSH_CIPHER_SSH2) {
+ debug("bad cipher %s [%s]", p, names);
+ xfree(cipher_list);
+ return 0;
+ } else {
+ debug3("cipher ok: %s [%s]", p, names);
+ }
+ }
+ debug3("ciphers ok: [%s]", names);
+ xfree(cipher_list);
+ return 1;
}
/*
- * SSH uses a variation on Blowfish, all bytes must be swapped before
- * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
+ * Parses the name of the cipher. Returns the number of the corresponding
+ * cipher, or -1 on error.
*/
-static
-void
-swap_bytes(const unsigned char *src, unsigned char *dst_, int n)
+
+int
+cipher_number(const char *name)
{
- u_int32_t *dst = (u_int32_t *)dst_; /* dst must be properly aligned. */
- union {
- u_int32_t i;
- char c[4];
- } t;
-
- /* Process 8 bytes every lap. */
- for (n = n / 8; n > 0; n--)
- {
- t.c[3] = *src++;
- t.c[2] = *src++;
- t.c[1] = *src++;
- t.c[0] = *src++;
- *dst++ = t.i;
-
- t.c[3] = *src++;
- t.c[2] = *src++;
- t.c[1] = *src++;
- t.c[0] = *src++;
- *dst++ = t.i;
- }
+ Cipher *c;
+ if (name == NULL)
+ return -1;
+ for (c = ciphers; c->name != NULL; c++)
+ if (strcasecmp(c->name, name) == 0)
+ return c->number;
+ return -1;
}
-void (*cipher_attack_detected)(const char *fmt, ...) = fatal;
+char *
+cipher_name(int id)
+{
+ Cipher *c = cipher_by_number(id);
+ return (c==NULL) ? "<unknown>" : c->name;
+}
-static inline
void
-detect_cbc_attack(const unsigned char *src,
- unsigned int len)
+cipher_init(CipherContext *cc, Cipher *cipher,
+ const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
+ int do_encrypt)
{
- return;
-
- log("CRC-32 CBC insertion attack detected");
- cipher_attack_detected("CRC-32 CBC insertion attack detected");
+ static int dowarn = 1;
+#ifdef SSH_OLD_EVP
+ EVP_CIPHER *type;
+#else
+ const EVP_CIPHER *type;
+ int klen;
+#endif
+ u_char *junk, *discard;
+
+ if (cipher->number == SSH_CIPHER_DES) {
+ if (dowarn) {
+ error("Warning: use of DES is strongly discouraged "
+ "due to cryptographic weaknesses");
+ dowarn = 0;
+ }
+ if (keylen > 8)
+ keylen = 8;
+ }
+ cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
+
+ if (keylen < cipher->key_len)
+ fatal("cipher_init: key length %d is insufficient for %s.",
+ keylen, cipher->name);
+ if (iv != NULL && ivlen < cipher->block_size)
+ fatal("cipher_init: iv length %d is insufficient for %s.",
+ ivlen, cipher->name);
+ cc->cipher = cipher;
+
+ type = (*cipher->evptype)();
+
+ EVP_CIPHER_CTX_init(&cc->evp);
+#ifdef SSH_OLD_EVP
+ if (type->key_len > 0 && type->key_len != keylen) {
+ debug("cipher_init: set keylen (%d -> %d)",
+ type->key_len, keylen);
+ type->key_len = keylen;
+ }
+ EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
+ (do_encrypt == CIPHER_ENCRYPT));
+#else
+ if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
+ (do_encrypt == CIPHER_ENCRYPT)) == 0)
+ fatal("cipher_init: EVP_CipherInit failed for %s",
+ cipher->name);
+ klen = EVP_CIPHER_CTX_key_length(&cc->evp);
+ if (klen > 0 && keylen != (u_int)klen) {
+ debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
+ if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
+ fatal("cipher_init: set keylen failed (%d -> %d)",
+ klen, keylen);
+ }
+ if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
+ fatal("cipher_init: EVP_CipherInit: set key failed for %s",
+ cipher->name);
+#endif
+
+ if (cipher->discard_len > 0) {
+ junk = xmalloc(cipher->discard_len);
+ discard = xmalloc(cipher->discard_len);
+ if (EVP_Cipher(&cc->evp, discard, junk,
+ cipher->discard_len) == 0)
+ fatal("evp_crypt: EVP_Cipher failed during discard");
+ memset(discard, 0, cipher->discard_len);
+ xfree(junk);
+ xfree(discard);
+ }
}
-/* Names of all encryption algorithms. These must match the numbers defined
- int cipher.h. */
-static char *cipher_names[] =
+void
+cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
{
- "none",
- "idea",
- "des",
- "3des",
- "tss",
- "rc4",
- "blowfish"
-};
-
-/* Returns a bit mask indicating which ciphers are supported by this
- implementation. The bit mask has the corresponding bit set of each
- supported cipher. */
+ if (len % cc->cipher->block_size)
+ fatal("cipher_encrypt: bad plaintext length %d", len);
+ if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
+ fatal("evp_crypt: EVP_Cipher failed");
+}
-unsigned int cipher_mask()
+void
+cipher_cleanup(CipherContext *cc)
{
- unsigned int mask = 0;
- mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */
- mask |= 1 << SSH_CIPHER_BLOWFISH;
- return mask;
+ if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
+ error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
}
-/* Returns the name of the cipher. */
+/*
+ * Selects the cipher, and keys if by computing the MD5 checksum of the
+ * passphrase and using the resulting 16 bytes as the key.
+ */
-const
-char *cipher_name(int cipher)
+void
+cipher_set_key_string(CipherContext *cc, Cipher *cipher,
+ const char *passphrase, int do_encrypt)
{
- if (cipher < 0 || cipher >= sizeof(cipher_names) / sizeof(cipher_names[0]) ||
- cipher_names[cipher] == NULL)
- fatal("cipher_name: bad cipher number: %d", cipher);
- return cipher_names[cipher];
+ MD5_CTX md;
+ u_char digest[16];
+
+ MD5_Init(&md);
+ MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
+ MD5_Final(digest, &md);
+
+ cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
+
+ memset(digest, 0, sizeof(digest));
+ memset(&md, 0, sizeof(md));
}
-/* Parses the name of the cipher. Returns the number of the corresponding
- cipher, or -1 on error. */
+/*
+ * Exports an IV from the CipherContext required to export the key
+ * state back from the unprivileged child to the privileged parent
+ * process.
+ */
int
-cipher_number(const char *name)
+cipher_get_keyiv_len(const CipherContext *cc)
{
- int i;
- for (i = 0; i < sizeof(cipher_names) / sizeof(cipher_names[0]); i++)
- if (strcmp(cipher_names[i], name) == 0 &&
- (cipher_mask() & (1 << i)))
- return i;
- return -1;
+ Cipher *c = cc->cipher;
+ int ivlen;
+
+ if (c->number == SSH_CIPHER_3DES)
+ ivlen = 24;
+ else
+ ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
+ return (ivlen);
}
-/* Selects the cipher, and keys if by computing the MD5 checksum of the
- passphrase and using the resulting 16 bytes as the key. */
-
-void cipher_set_key_string(CipherContext *context, int cipher,
- const char *passphrase, int for_encryption)
+void
+cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
{
- MD5_CTX md;
- unsigned char digest[16];
-
- MD5_Init(&md);
- MD5_Update(&md, (const unsigned char *)passphrase, strlen(passphrase));
- MD5_Final(digest, &md);
-
- cipher_set_key(context, cipher, digest, 16, for_encryption);
-
- memset(digest, 0, sizeof(digest));
- memset(&md, 0, sizeof(md));
+ Cipher *c = cc->cipher;
+ int evplen;
+
+ switch (c->number) {
+ case SSH_CIPHER_SSH2:
+ case SSH_CIPHER_DES:
+ case SSH_CIPHER_BLOWFISH:
+ evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
+ if (evplen <= 0)
+ return;
+ if ((u_int)evplen != len)
+ fatal("%s: wrong iv length %d != %d", __func__,
+ evplen, len);
+#ifdef USE_BUILTIN_RIJNDAEL
+ if (c->evptype == evp_rijndael)
+ 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:
+ ssh1_3des_iv(&cc->evp, 0, iv, 24);
+ break;
+ default:
+ fatal("%s: bad cipher %d", __func__, c->number);
+ }
}
-/* Selects the cipher to use and sets the key. */
-
-void cipher_set_key(CipherContext *context, int cipher,
- const unsigned char *key, int keylen, int for_encryption)
+void
+cipher_set_keyiv(CipherContext *cc, u_char *iv)
{
- unsigned char padded[32];
-
- /* Set cipher type. */
- context->type = cipher;
-
- /* Get 32 bytes of key data. Pad if necessary. (So that code below does
- not need to worry about key size). */
- memset(padded, 0, sizeof(padded));
- memcpy(padded, key, keylen < sizeof(padded) ? keylen : sizeof(padded));
-
- /* Initialize the initialization vector. */
- switch (cipher)
- {
- case SSH_CIPHER_NONE:
- /* Has to stay for authfile saving of private key with no passphrase */
- break;
-
- case SSH_CIPHER_3DES:
- /* Note: the least significant bit of each byte of key is parity,
- and must be ignored by the implementation. 16 bytes of key are
- used (first and last keys are the same). */
- if (keylen < 16)
- error("Key length %d is insufficient for 3DES.", keylen);
- des_set_key((void*)padded, context->u.des3.key1);
- des_set_key((void*)(padded + 8), context->u.des3.key2);
- if (keylen <= 16)
- des_set_key((void*)padded, context->u.des3.key3);
- else
- des_set_key((void*)(padded + 16), context->u.des3.key3);
- memset(context->u.des3.iv2, 0, sizeof(context->u.des3.iv2));
- memset(context->u.des3.iv3, 0, sizeof(context->u.des3.iv3));
- break;
-
- case SSH_CIPHER_BLOWFISH:
- BF_set_key(&context->u.bf.key, keylen, padded);
- memset(context->u.bf.iv, 0, 8);
- break;
-
- default:
- fatal("cipher_set_key: unknown cipher: %d", cipher);
- }
- memset(padded, 0, sizeof(padded));
+ Cipher *c = cc->cipher;
+ int evplen = 0;
+
+ switch (c->number) {
+ case SSH_CIPHER_SSH2:
+ case SSH_CIPHER_DES:
+ case SSH_CIPHER_BLOWFISH:
+ evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
+ if (evplen == 0)
+ return;
+#ifdef USE_BUILTIN_RIJNDAEL
+ if (c->evptype == evp_rijndael)
+ 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:
+ ssh1_3des_iv(&cc->evp, 1, iv, 24);
+ break;
+ default:
+ fatal("%s: bad cipher %d", __func__, c->number);
+ }
}
-/* Encrypts data using the cipher. */
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
+#define EVP_X_STATE(evp) &(evp).c
+#define EVP_X_STATE_LEN(evp) sizeof((evp).c)
+#else
+#define EVP_X_STATE(evp) (evp).cipher_data
+#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
+#endif
-void cipher_encrypt(CipherContext *context, unsigned char *dest,
- const unsigned char *src, unsigned int len)
+int
+cipher_get_keycontext(const CipherContext *cc, u_char *dat)
{
- if ((len & 7) != 0)
- fatal("cipher_encrypt: bad plaintext length %d", len);
-
- switch (context->type)
- {
- case SSH_CIPHER_NONE:
- memcpy(dest, src, len);
- break;
-
- case SSH_CIPHER_3DES:
- SSH_3CBC_ENCRYPT(context->u.des3.key1,
- context->u.des3.key2, &context->u.des3.iv2,
- context->u.des3.key3, &context->u.des3.iv3,
- dest, (void*)src, len);
- break;
-
- case SSH_CIPHER_BLOWFISH:
- swap_bytes(src, dest, len);
- BF_cbc_encrypt(dest, dest, len,
- &context->u.bf.key, context->u.bf.iv, BF_ENCRYPT);
- swap_bytes(dest, dest, len);
- break;
-
- default:
- fatal("cipher_encrypt: unknown cipher: %d", context->type);
- }
+ Cipher *c = cc->cipher;
+ int plen = 0;
+
+ if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
+ plen = EVP_X_STATE_LEN(cc->evp);
+ if (dat == NULL)
+ return (plen);
+ memcpy(dat, EVP_X_STATE(cc->evp), plen);
+ }
+ return (plen);
}
-
-/* Decrypts data using the cipher. */
-void cipher_decrypt(CipherContext *context, unsigned char *dest,
- const unsigned char *src, unsigned int len)
+void
+cipher_set_keycontext(CipherContext *cc, u_char *dat)
{
- if ((len & 7) != 0)
- fatal("cipher_decrypt: bad ciphertext length %d", len);
-
- switch (context->type)
- {
- case SSH_CIPHER_NONE:
- memcpy(dest, src, len);
- break;
-
- case SSH_CIPHER_3DES:
- /* CRC-32 attack? */
- SSH_3CBC_DECRYPT(context->u.des3.key1,
- context->u.des3.key2, &context->u.des3.iv2,
- context->u.des3.key3, &context->u.des3.iv3,
- dest, (void*)src, len);
- break;
-
- case SSH_CIPHER_BLOWFISH:
- detect_cbc_attack(src, len);
- swap_bytes(src, dest, len);
- BF_cbc_encrypt((void*)dest, dest, len,
- &context->u.bf.key, context->u.bf.iv, BF_DECRYPT);
- swap_bytes(dest, dest, len);
- break;
-
- default:
- fatal("cipher_decrypt: unknown cipher: %d", context->type);
- }
+ Cipher *c = cc->cipher;
+ int plen;
+
+ if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
+ plen = EVP_X_STATE_LEN(cc->evp);
+ memcpy(EVP_X_STATE(cc->evp), dat, plen);
+ }
}
andersk / openssh.git / blobdiff