libssh: /build/libssh/src/libssh-0.8.2/include/libssh/crypto.h Source File

libssh 0.8.2 The SSH library

crypto.h
1 /*
2 * This file is part of the SSH Library
3 *
4 * Copyright (c) 2003-2009 by Aris Adamantiadis
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /*
22 * crypto.h is an include file for internal cryptographic structures of libssh
23 */
24
25 #ifndef _CRYPTO_H_
26 #define _CRYPTO_H_
27
28 #include "config.h"
29
30 #ifdef HAVE_LIBGCRYPT
31 #include <gcrypt.h>
32 #endif
33 #include "libssh/wrapper.h"
34
35 #ifdef cbc_encrypt
36 #undef cbc_encrypt
37 #endif
38 #ifdef cbc_decrypt
39 #undef cbc_decrypt
40 #endif
41
42 #ifdef HAVE_OPENSSL_ECDH_H
43 #include <openssl/ecdh.h>
44 #endif
45 #include "libssh/ecdh.h"
46 #include "libssh/kex.h"
47 #include "libssh/curve25519.h"
48
49 #define DIGEST_MAX_LEN 64
50
51 enum ssh_key_exchange_e {
52 /* diffie-hellman-group1-sha1 */
53 SSH_KEX_DH_GROUP1_SHA1=1,
54 /* diffie-hellman-group14-sha1 */
55 SSH_KEX_DH_GROUP14_SHA1,
56 /* ecdh-sha2-nistp256 */
57 SSH_KEX_ECDH_SHA2_NISTP256,
58 /* ecdh-sha2-nistp384 */
59 SSH_KEX_ECDH_SHA2_NISTP384,
60 /* ecdh-sha2-nistp521 */
61 SSH_KEX_ECDH_SHA2_NISTP521,
62 /* curve25519-sha256@libssh.org */
63 SSH_KEX_CURVE25519_SHA256_LIBSSH_ORG,
64 /* curve25519-sha256 */
65 SSH_KEX_CURVE25519_SHA256
66 };
67
68 enum ssh_cipher_e {
69 SSH_NO_CIPHER=0,
70 SSH_BLOWFISH_CBC,
71 SSH_3DES_CBC,
72 SSH_AES128_CBC,
73 SSH_AES192_CBC,
74 SSH_AES256_CBC,
75 SSH_AES128_CTR,
76 SSH_AES192_CTR,
77 SSH_AES256_CTR
78 };
79
80 struct ssh_crypto_struct {
81 bignum e,f,x,k,y;
82 #ifdef HAVE_ECDH
83 #ifdef HAVE_OPENSSL_ECC
84 EC_KEY *ecdh_privkey;
85 #elif defined HAVE_GCRYPT_ECC
86 gcry_sexp_t ecdh_privkey;
87 #elif defined HAVE_LIBMBEDCRYPTO
88 mbedtls_ecp_keypair *ecdh_privkey;
89 #endif
90 ssh_string ecdh_client_pubkey;
91 ssh_string ecdh_server_pubkey;
92 #endif
93 #ifdef HAVE_CURVE25519
94 ssh_curve25519_privkey curve25519_privkey;
95 ssh_curve25519_pubkey curve25519_client_pubkey;
96 ssh_curve25519_pubkey curve25519_server_pubkey;
97 #endif
98 ssh_string dh_server_signature; /* information used by dh_handshake. */
99 size_t digest_len; /* len of all the fields below */
100 unsigned char *session_id;
101 unsigned char *secret_hash; /* Secret hash is same as session id until re-kex */
102 unsigned char *encryptIV;
103 unsigned char *decryptIV;
104 unsigned char *decryptkey;
105 unsigned char *encryptkey;
106 unsigned char *encryptMAC;
107 unsigned char *decryptMAC;
108 unsigned char hmacbuf[DIGEST_MAX_LEN];
109 struct ssh_cipher_struct *in_cipher, *out_cipher; /* the cipher structures/objects */
110 enum ssh_hmac_e in_hmac, out_hmac; /* the MAC algorithms used */
111
112 ssh_key server_pubkey;
113 int do_compress_out; /* idem */
114 int do_compress_in; /* don't set them, set the option instead */
115 int delayed_compress_in; /* Use of zlib@openssh.org */
116 int delayed_compress_out;
117 void *compress_out_ctx; /* don't touch it */
118 void *compress_in_ctx; /* really, don't */
119 /* kex sent by server, client, and mutually elected methods */
120 struct ssh_kex_struct server_kex;
121 struct ssh_kex_struct client_kex;
122 char *kex_methods[SSH_KEX_METHODS];
123 enum ssh_key_exchange_e kex_type;
124 enum ssh_mac_e mac_type; /* Mac operations to use for key gen */
125 };
126
127 struct ssh_cipher_struct {
128 const char *name; /* ssh name of the algorithm */
129 unsigned int blocksize; /* blocksize of the algo */
130 enum ssh_cipher_e ciphertype;
131 uint32_t lenfield_blocksize; /* blocksize of the packet length field */
132 size_t keylen; /* length of the key structure */
133 #ifdef HAVE_LIBGCRYPT
134 gcry_cipher_hd_t *key;
135 #elif defined HAVE_LIBCRYPTO
136 struct ssh_3des_key_schedule *des3_key;
137 struct ssh_aes_key_schedule *aes_key;
138 const EVP_CIPHER *cipher;
139 EVP_CIPHER_CTX *ctx;
140 #elif defined HAVE_LIBMBEDCRYPTO
141 mbedtls_cipher_context_t encrypt_ctx;
142 mbedtls_cipher_context_t decrypt_ctx;
143 mbedtls_cipher_type_t type;
144 #endif
145 struct chacha20_poly1305_keysched *chacha20_schedule;
146 unsigned int keysize; /* bytes of key used. != keylen */
147 size_t tag_size; /* overhead required for tag */
148 /* sets the new key for immediate use */
149 int (*set_encrypt_key)(struct ssh_cipher_struct *cipher, void *key, void *IV);
150 int (*set_decrypt_key)(struct ssh_cipher_struct *cipher, void *key, void *IV);
151 void (*encrypt)(struct ssh_cipher_struct *cipher, void *in, void *out,
152 unsigned long len);
153 void (*decrypt)(struct ssh_cipher_struct *cipher, void *in, void *out,
154 unsigned long len);
155 void (*aead_encrypt)(struct ssh_cipher_struct *cipher, void *in, void *out,
156 size_t len, uint8_t *mac, uint64_t seq);
157 int (*aead_decrypt_length)(struct ssh_cipher_struct *cipher, void *in,
158 uint8_t *out, size_t len, uint64_t seq);
159 int (*aead_decrypt)(struct ssh_cipher_struct *cipher, void *complete_packet, uint8_t *out,
160 size_t encrypted_size, uint64_t seq);
161 void (*cleanup)(struct ssh_cipher_struct *cipher);
162 };
163
164 const struct ssh_cipher_struct *ssh_get_chacha20poly1305_cipher(void);
165
166 #endif /* _CRYPTO_H_ */
ssh_kex_struct
Definition: kex.h:29
ssh_key_struct
Definition: pki.h:42
ssh_crypto_struct
Definition: crypto.h:80
ssh_string_struct
Definition: string.h:29
chacha20_poly1305_keysched
Definition: chachapoly.c:32
ssh_cipher_struct
Definition: crypto.h:127