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/* XChat-WDK
* Copyright (c) 2010 Berke Viktor.
*
* Use of OpenSSL SHA256 interface: http://adamlamers.com/?p=5
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <malloc.h>
#include <errno.h>
#include <openssl/sha.h>
#include "xchat-plugin.h"
#define BUFSIZE 32768
static xchat_plugin *ph; /* plugin handle */
void
sha256_hash_string (unsigned char hash[SHA256_DIGEST_LENGTH], char outputBuffer[65])
{
int i = 0;
for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
{
sprintf(outputBuffer + (i * 2), "%02x", hash[i]);
}
outputBuffer[64] = 0;
}
void
sha256 (char *string, char outputBuffer[65])
{
int i;
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
SHA256_Init (&sha256);
SHA256_Update (&sha256, string, strlen(string));
SHA256_Final (hash, &sha256);
for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
{
sprintf (outputBuffer + (i * 2), "%02x", hash[i]);
}
outputBuffer[64] = 0;
}
int
sha256_file (char *path, char outputBuffer[65])
{
int bytesRead;
unsigned char *buffer;
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
FILE *file = fopen (path, "rb");
if (!file)
{
return -534;
}
SHA256_Init (&sha256);
buffer = malloc (BUFSIZE);
bytesRead = 0;
if (!buffer)
{
return ENOMEM;
}
while ((bytesRead = fread (buffer, 1, BUFSIZE, file)))
{
SHA256_Update (&sha256, buffer, bytesRead);
}
SHA256_Final (hash, &sha256);
sha256_hash_string (hash, outputBuffer);
fclose (file);
free (buffer);
return 0;
}
int
dccrecv_cb(char *word[], void *userdata)
{
unsigned char sum[65];
sha256_file (word[2], sum);
/* try to print the checksum in the privmsg tab of the sender */
xchat_set_context (ph, xchat_find_context (ph, NULL, word[3]));
xchat_printf (ph, "SHA-256 checksum for %s (local): %s\n", word[1], sum);
return XCHAT_EAT_NONE;
}
int
dccoffer_cb(char *word[], void *userdata)
{
unsigned char sum[65];
sha256_file (word[3], sum);
xchat_commandf (ph, "raw PRIVMSG %s :SHA-256 checksum for %s (remote): %s", word[2], word[1], sum);
return XCHAT_EAT_NONE;
}
int
xchat_plugin_init (xchat_plugin *plugin_handle, char **plugin_name, char **plugin_desc, char **plugin_version, char *arg)
{
ph = plugin_handle;
*plugin_name = "Checksum";
*plugin_desc = "Calculate checksum for DCC file transfers";
*plugin_version = "1.1";
xchat_hook_print (ph, "DCC RECV Complete", XCHAT_PRI_NORM, dccrecv_cb, NULL);
xchat_hook_print (ph, "DCC Offer", XCHAT_PRI_NORM, dccoffer_cb, NULL);
xchat_print (ph, "Checksum plugin loaded\n");
return 1;
}
int
xchat_plugin_deinit (void)
{
xchat_print (ph, "Checksum plugin unloaded\n");
return 1;
}
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