cipher.h

/* $OpenBSD: cipher.h,v 1.49 2016/08/03 05:41:57 djm Exp $ */

/*
 * Author: Tatu Ylonen <[email protected]>
 * Copyright (c) 1995 Tatu Ylonen <[email protected]>, 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) 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.
 */

#ifndef CIPHER_H
#define CIPHER_H

#include <sys/types.h>
#include <openssl/evp.h>
#include "cipher-chachapoly.h"
#include "cipher-aesctr.h"

/*
 * Cipher types for SSH-1.  New types can be added, but old types should not
 * be removed for compatibility.  The maximum allowed value is 31.
 */
#define SSH_CIPHER_SSH2     -3
#define SSH_CIPHER_INVALID  -2  /* No valid cipher selected. */
#define SSH_CIPHER_NOT_SET  -1  /* None selected (invalid number). */
#define SSH_CIPHER_NONE     0   /* no encryption */
#define SSH_CIPHER_IDEA     1   /* IDEA CFB */
#define SSH_CIPHER_DES      2   /* DES CBC */
#define SSH_CIPHER_3DES     3   /* 3DES CBC */
#define SSH_CIPHER_BROKEN_TSS   4   /* TRI's Simple Stream encryption CBC */
#define SSH_CIPHER_BROKEN_RC4   5   /* Alleged RC4 */
#define SSH_CIPHER_BLOWFISH 6
#define SSH_CIPHER_RESERVED 7
#define SSH_CIPHER_MAX      31

#define CIPHER_ENCRYPT      1
#define CIPHER_DECRYPT      0

struct sshcipher;
struct sshcipher_ctx;

void ssh_aes_ctr_thread_destroy(EVP_CIPHER_CTX *ctx); // defined in cipher-ctr-mt.c
void ssh_aes_ctr_thread_reconstruction(EVP_CIPHER_CTX *ctx);

u_int    cipher_mask_ssh1(int);
struct sshcipher *cipher_by_name(const char *);
const struct sshcipher *cipher_by_number(int);
int  cipher_number(const char *);
char    *cipher_name(int);
const char *cipher_warning_message(const struct sshcipher_ctx *);
int  ciphers_valid(const char *);
char    *cipher_alg_list(char, int);
int  cipher_init(struct sshcipher_ctx **, const struct sshcipher *,
    const u_char *, u_int, const u_char *, u_int, int);
int  cipher_crypt(struct sshcipher_ctx *, u_int, u_char *, const u_char *,
    u_int, u_int, u_int);
int  cipher_get_length(struct sshcipher_ctx *, u_int *, u_int,
    const u_char *, u_int);
void     cipher_free(struct sshcipher_ctx *);
int  cipher_set_key_string(struct sshcipher_ctx **,
    const struct sshcipher *, const char *, int);
u_int    cipher_blocksize(const struct sshcipher *);
u_int    cipher_keylen(const struct sshcipher *);
u_int    cipher_seclen(const struct sshcipher *);
u_int    cipher_authlen(const struct sshcipher *);
u_int    cipher_ivlen(const struct sshcipher *);
u_int    cipher_is_cbc(const struct sshcipher *);
void     cipher_reset_multithreaded(void);

const char *cipher_ctx_name(const struct sshcipher_ctx *);
u_int    cipher_ctx_is_plaintext(struct sshcipher_ctx *);
u_int    cipher_ctx_get_number(struct sshcipher_ctx *);

u_int    cipher_get_number(const struct sshcipher *);
int  cipher_get_keyiv(struct sshcipher_ctx *, u_char *, u_int);
int  cipher_set_keyiv(struct sshcipher_ctx *, const u_char *);
int  cipher_get_keyiv_len(const struct sshcipher_ctx *);
int  cipher_get_keycontext(const struct sshcipher_ctx *, u_char *);
void     cipher_set_keycontext(struct sshcipher_ctx *, const u_char *);

#endif              /* CIPHER_H */