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 Public crypto interface. */
   8
   9
  10 /** \cond used to distinguish between loading of private/public key */
  11 #define LOAD_PUBLIC_KEY 0
  12 #define LOAD_PRIVATE_KEY 1
  13 #define CHALLENGE_SIZE 64
  14 /** \endcond **/
  15
  16 /* asymetric (public key) crypto */
  17
  18 /** Opaque structure for public and private keys. */
  19 struct asymmetric_key;
  20
  21 int pub_encrypt(struct asymmetric_key *pub, unsigned char *inbuf,
  22                 unsigned len, unsigned char *outbuf);
  23 int priv_decrypt(const char *key_file, unsigned char *outbuf,
  24                 unsigned char *inbuf, int inlen);
  25 int get_asymmetric_key(const char *key_file, int private,
  26                 struct asymmetric_key **result);
  27 void free_asymmetric_key(struct asymmetric_key *key);
  28
  29 /* random numbers */
  30 void get_random_bytes_or_die(unsigned char *buf, int num);
  31 void init_random_seed_or_die(void);
  32
  33 /* stream cipher declarations and prototypes */
  34
  35 /** Opaque structure for stream ciphers. */
  36 struct stream_cipher;
  37 /** Number of bytes of the session key for stream ciphers. */
  38 #define SESSION_KEY_LEN 32
  39 /**
  40  * Used for client-server communication encryption.
  41  *
  42  * The traffic between (the forked child of) para_server and the remote client
  43  * process is crypted by a symmetric session key. This structure contains the
  44  * keys for the stream cipher and the file descriptor for which these keys
  45  * should be used.
  46  */
  47 struct stream_cipher_context {
  48         /** The socket file descriptor. */
  49         int fd;
  50         /** Key used for receiving data. */
  51         struct stream_cipher *recv;
  52         /** Key used for sending data. */
  53         struct stream_cipher *send;
  54 };
  55 struct stream_cipher *sc_new(const unsigned char *data, int len);
  56 void sc_free(struct stream_cipher *sc);
  57 int sc_send_bin_buffer(struct stream_cipher_context *scc, const char *buf,
  58                 size_t len);
  59 int sc_send_buffer(struct stream_cipher_context *scc, const char *buf);
  60 __printf_2_3 int sc_send_va_buffer(struct stream_cipher_context *scc,
  61                 const char *fmt, ...);
  62 int sc_recv_bin_buffer(struct stream_cipher_context *scc, char *buf,
  63                 size_t size);
  64 int sc_recv_buffer(struct stream_cipher_context *scc, char *buf, size_t size);
  65
  66 /* hashing */
  67
  68 /** Size of the hash value in bytes. */
  69 #define HASH_SIZE 20
  70
  71 void hash_function(const char *data, unsigned long len, unsigned char *hash);
  72 void hash_to_asc(unsigned char *hash, char *asc);
  73 int hash_compare(unsigned char *h1, unsigned char *h2);