-
-/** Information about one encrypted connection. */
-struct crypt_data {
- /** Function used to decrypt received data. */
- crypt_function *recv;
- /** Function used to encrypt data to be sent. */
- crypt_function *send;
- /**
- * Context-dependent data (crypt keys), passed verbatim to the above
- * crypt functions.
- */
- void *private_data;
-};
-/** Array holding per fd crypt data. */
-static struct crypt_data *crypt_data_array;
-/** Current size of the crypt data array. */
-static unsigned cda_size = 0;
-
-/**
- * Activate encryption for one file descriptor.
- *
- * \param fd The file descriptor.
- * \param recv_f The function used for decrypting received data.
- * \param send_f The function used for encrypting before sending.
- * \param private_data User data supplied by the caller.
- */
-void enable_crypt(int fd, crypt_function *recv_f, crypt_function *send_f,
- void *private_data)
-{
- if (fd + 1 > cda_size) {
- crypt_data_array = para_realloc(crypt_data_array,
- (fd + 1) * sizeof(struct crypt_data));
- memset(crypt_data_array + cda_size, 0,
- (fd + 1 - cda_size) * sizeof(struct crypt_data));
- cda_size = fd + 1;
- }
- crypt_data_array[fd].recv = recv_f;
- crypt_data_array[fd].send = send_f;
- crypt_data_array[fd].private_data = private_data;
- PARA_INFO_LOG("rc4 encryption activated for fd %d\n", fd);
-}
-
-/**
- * Deactivate encryption for a given fd.
- *
- * \param fd The file descriptor.
- *
- * This must be called if and only if \p fd was activated via enable_crypt().
- */
-void disable_crypt(int fd)
-{
- if (cda_size < fd + 1)
- return;
- crypt_data_array[fd].recv = NULL;
- crypt_data_array[fd].send = NULL;
- crypt_data_array[fd].private_data = NULL;
-}
-