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13ae44ce58
[cipher.c cipher.h packet.c]
Work around the CPNI-957037 Plaintext Recovery Attack by always
reading 256K of data on packet size or HMAC errors (in CBC mode only).
Help, feedback and ok djm@
Feedback from Martin Albrecht and Paterson Kenny
93 lines
3.7 KiB
C
93 lines
3.7 KiB
C
/* $OpenBSD: cipher.h,v 1.37 2009/01/26 09:58:15 markus Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CIPHER_H
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#define CIPHER_H
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#include <openssl/evp.h>
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/*
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* Cipher types for SSH-1. New types can be added, but old types should not
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* be removed for compatibility. The maximum allowed value is 31.
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*/
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#define SSH_CIPHER_SSH2 -3
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#define SSH_CIPHER_INVALID -2 /* No valid cipher selected. */
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#define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
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#define SSH_CIPHER_NONE 0 /* no encryption */
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#define SSH_CIPHER_IDEA 1 /* IDEA CFB */
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#define SSH_CIPHER_DES 2 /* DES CBC */
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#define SSH_CIPHER_3DES 3 /* 3DES CBC */
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#define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */
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#define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */
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#define SSH_CIPHER_BLOWFISH 6
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#define SSH_CIPHER_RESERVED 7
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#define SSH_CIPHER_MAX 31
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#define CIPHER_ENCRYPT 1
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#define CIPHER_DECRYPT 0
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typedef struct Cipher Cipher;
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typedef struct CipherContext CipherContext;
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struct Cipher;
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struct CipherContext {
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int plaintext;
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EVP_CIPHER_CTX evp;
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Cipher *cipher;
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};
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u_int cipher_mask_ssh1(int);
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Cipher *cipher_by_name(const char *);
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Cipher *cipher_by_number(int);
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int cipher_number(const char *);
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char *cipher_name(int);
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int ciphers_valid(const char *);
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void cipher_init(CipherContext *, Cipher *, const u_char *, u_int,
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const u_char *, u_int, int);
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void cipher_crypt(CipherContext *, u_char *, const u_char *, u_int);
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void cipher_cleanup(CipherContext *);
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void cipher_set_key_string(CipherContext *, Cipher *, const char *, int);
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u_int cipher_blocksize(const Cipher *);
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u_int cipher_keylen(const Cipher *);
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u_int cipher_is_cbc(const Cipher *);
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u_int cipher_get_number(const Cipher *);
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void cipher_get_keyiv(CipherContext *, u_char *, u_int);
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void cipher_set_keyiv(CipherContext *, u_char *);
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int cipher_get_keyiv_len(const CipherContext *);
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int cipher_get_keycontext(const CipherContext *, u_char *);
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void cipher_set_keycontext(CipherContext *, u_char *);
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#endif /* CIPHER_H */
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