libssh 0.5.2

include/libssh/crypto.h

00001 /*
00002  * This file is part of the SSH Library
00003  *
00004  * Copyright (c) 2003,2009 by Aris Adamantiadis
00005  *
00006  * The SSH Library is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 2.1 of the License, or (at your
00009  * option) any later version.
00010  *
00011  * The SSH Library is distributed in the hope that it will be useful, but
00012  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
00013  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00014  * License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with the SSH Library; see the file COPYING.  If not, write to
00018  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00019  * MA 02111-1307, USA.
00020  */
00021 
00022 /*
00023  * crypto.h is an include file for internal cryptographic structures of libssh
00024  */
00025 
00026 #ifndef _CRYPTO_H_
00027 #define _CRYPTO_H_
00028 
00029 #include "config.h"
00030 
00031 #ifdef HAVE_LIBGCRYPT
00032 #include <gcrypt.h>
00033 #endif
00034 #include "libssh/wrapper.h"
00035 
00036 #ifdef cbc_encrypt
00037 #undef cbc_encrypt
00038 #endif
00039 #ifdef cbc_decrypt
00040 #undef cbc_decrypt
00041 #endif
00042 
00043 struct ssh_crypto_struct {
00044     bignum e,f,x,k,y;
00045     unsigned char session_id[SHA_DIGEST_LEN];
00046 
00047     unsigned char encryptIV[SHA_DIGEST_LEN*2];
00048     unsigned char decryptIV[SHA_DIGEST_LEN*2];
00049 
00050     unsigned char decryptkey[SHA_DIGEST_LEN*2];
00051     unsigned char encryptkey[SHA_DIGEST_LEN*2];
00052 
00053     unsigned char encryptMAC[SHA_DIGEST_LEN];
00054     unsigned char decryptMAC[SHA_DIGEST_LEN];
00055     unsigned char hmacbuf[EVP_MAX_MD_SIZE];
00056     struct crypto_struct *in_cipher, *out_cipher; /* the cipher structures/objects */
00057     ssh_string server_pubkey;
00058     const char *server_pubkey_type;
00059     int do_compress_out; /* idem */
00060     int do_compress_in; /* don't set them, set the option instead */
00061     int delayed_compress_in; /* Use of zlib@openssh.org */
00062     int delayed_compress_out;
00063     void *compress_out_ctx; /* don't touch it */
00064     void *compress_in_ctx; /* really, don't */
00065 };
00066 
00067 struct crypto_struct {
00068     const char *name; /* ssh name of the algorithm */
00069     unsigned int blocksize; /* blocksize of the algo */
00070     unsigned int keylen; /* length of the key structure */
00071 #ifdef HAVE_LIBGCRYPT
00072     gcry_cipher_hd_t *key;
00073 #elif defined HAVE_LIBCRYPTO
00074     void *key; /* a key buffer allocated for the algo */
00075 #endif
00076     unsigned int keysize; /* bytes of key used. != keylen */
00077 #ifdef HAVE_LIBGCRYPT
00078     /* sets the new key for immediate use */
00079     int (*set_encrypt_key)(struct crypto_struct *cipher, void *key, void *IV);
00080     int (*set_decrypt_key)(struct crypto_struct *cipher, void *key, void *IV);
00081     void (*cbc_encrypt)(struct crypto_struct *cipher, void *in, void *out,
00082         unsigned long len);
00083     void (*cbc_decrypt)(struct crypto_struct *cipher, void *in, void *out,
00084         unsigned long len);
00085 #elif defined HAVE_LIBCRYPTO
00086     /* sets the new key for immediate use */
00087     int (*set_encrypt_key)(struct crypto_struct *cipher, void *key);
00088     int (*set_decrypt_key)(struct crypto_struct *cipher, void *key);
00089     void (*cbc_encrypt)(struct crypto_struct *cipher, void *in, void *out,
00090         unsigned long len, void *IV);
00091     void (*cbc_decrypt)(struct crypto_struct *cipher, void *in, void *out,
00092         unsigned long len, void *IV);
00093 #endif
00094 };
00095 
00096 /* vim: set ts=2 sw=2 et cindent: */
00097 #endif /* _CRYPTO_H_ */