Remove rc4.h.
[paraslash.git] / crypt.h
1 /*
2 * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file crypt.h Prototypes for paraslash crypto functions. */
8
9 /** Opaque structure for public and private keys. */
10 struct asymmetric_key;
11
12 int pub_encrypt(struct asymmetric_key *pub, unsigned char *inbuf,
13 unsigned len, unsigned char *outbuf);
14 int priv_decrypt(const char *key_file, unsigned char *outbuf,
15 unsigned char *inbuf, int inlen);
16 int get_asymmetric_key(const char *key_file, int private,
17 struct asymmetric_key **result);
18 void free_asymmetric_key(struct asymmetric_key *key);
19
20 void get_random_bytes_or_die(unsigned char *buf, int num);
21 void init_random_seed_or_die(void);
22
23 /** Opaque structure for stream cipher crypto. */
24 struct stream_cipher;
25
26 /** Number of bytes of the session key. */
27 #define SESSION_KEY_LEN 32
28
29 /**
30 * Used on the server-side for client-server communication encryption.
31 *
32 * The traffic between (the forked child of) para_server and the remote client
33 * process is crypted by a symmetric session key. This structure contains the
34 * keys for the stream cipher and the file descriptor for which these keys
35 * should be used.
36 */
37 struct stream_cipher_context {
38 /** The socket file descriptor. */
39 int fd;
40 /** Key used for receiving data. */
41 struct stream_cipher *recv;
42 /** Key used for sending data. */
43 struct stream_cipher *send;
44 };
45
46 struct stream_cipher *sc_new(const unsigned char *data, int len);
47 void sc_free(struct stream_cipher *sc);
48
49 int sc_send_bin_buffer(struct stream_cipher_context *scc, const char *buf,
50 size_t len);
51 int sc_send_buffer(struct stream_cipher_context *scc, const char *buf);
52 __printf_2_3 int sc_send_va_buffer(struct stream_cipher_context *scc,
53 const char *fmt, ...);
54 int sc_recv_bin_buffer(struct stream_cipher_context *scc, char *buf,
55 size_t size);
56 int sc_recv_buffer(struct stream_cipher_context *scc, char *buf, size_t size);
57
58 /** \cond used to distinguish between loading of private/public key */
59 #define LOAD_PUBLIC_KEY 0
60 #define LOAD_PRIVATE_KEY 1
61 #define CHALLENGE_SIZE 64
62 /** \endcond **/