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@moyix
Last active Sep 3, 2021
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JtR cracker for Copilot slur list hash format
/*
* Copilot cracker for JtR. Hacked together during August of 2021 by
* Brendan Dolan-Gavitt <mooyix at gmail.com>
*
* This software is Copyright (c) 2021, Brendan Dolan-Gavitt <mooyix at gmail.com>
* and it is hereby released to the general public under the following terms:
* Redistribution and use in source and binary forms, with or without
* modification, are permitted.
*
* Most of the file ripped off from pst_fmt_plug.c by Dhiru Kholia
*/
#if FMT_EXTERNS_H
extern struct fmt_main fmt_copilot;
#elif FMT_REGISTERS_H
john_register_one(&fmt_copilot);
#else
#include <string.h>
#include "arch.h"
#include "misc.h"
#include "common.h"
#include "formats.h"
#include "crc32.h"
#define FORMAT_LABEL "COPILOT"
#define FORMAT_NAME "dumb JS FP hash"
#define FORMAT_TAG "$copilot$"
#define FORMAT_TAG_LEN (sizeof(FORMAT_TAG)-1)
#define ALGORITHM_NAME "32/" ARCH_BITS_STR
#define BENCHMARK_COMMENT ""
#define BENCHMARK_LENGTH 0x107
#define PLAINTEXT_LENGTH 64
#define BINARY_SIZE 4
#define SALT_SIZE 0
#define BINARY_ALIGN sizeof(uint32_t)
#define SALT_ALIGN 1
#define MIN_KEYS_PER_CRYPT 1
#define MAX_KEYS_PER_CRYPT 1024
static struct fmt_tests tests[] = {
{"$copilot$d9b3eb62", "openwall"},
{"$copilot$5e69d01f", "password"},
{"$copilot$4db3af78", "xxx"},
{"$copilot$6c9866cb", "XYz123"},
{"$copilot$31868dc2", "thisisalongstring"},
{"$copilot$e2ff5182", "copilot"},
{"$copilot$b2b25b07", "qrsqrt"},
{NULL}
};
static char (*saved_key)[PLAINTEXT_LENGTH + 1];
static uint32_t (*crypt_out);
static void init(struct fmt_main *self)
{
saved_key = mem_calloc(self->params.max_keys_per_crypt,
sizeof(*saved_key));
crypt_out = mem_calloc(self->params.max_keys_per_crypt,
sizeof(*crypt_out));
}
static void done(void)
{
MEM_FREE(crypt_out);
MEM_FREE(saved_key);
}
static int valid(char *ciphertext, struct fmt_main *self)
{
char *p;
int extra;
if (strncmp(ciphertext, FORMAT_TAG, FORMAT_TAG_LEN))
return 0;
p = ciphertext + FORMAT_TAG_LEN;
if (hexlenl(p, &extra) != BINARY_SIZE * 2 || extra)
return 0;
return 1;
}
static void set_key(char *key, int index) {
strnzcpyn(saved_key[index], key, sizeof(*saved_key));
}
static int cmp_all(void *binary, int count)
{
uint32_t crc=*((uint32_t*)binary), i;
for (i = 0; i < count; ++i)
if (crc == crypt_out[i]) return 1;
return 0;
}
static int cmp_one(void *binary, int index)
{
return *((uint32_t*)binary) == crypt_out[index];
}
static int cmp_exact(char *source, int index)
{
return 1;
}
static int obfuscateWord(unsigned char *e) {
uint32_t t = 352960512;
unsigned char c;
while ((c = *e++)) {
t = (t*33) ^ c;
}
return t;
}
static int crypt_all(int *pcount, struct db_salt *salt)
{
const int count = *pcount;
int i;
for (i = 0; i < count; ++i) {
unsigned char *p = (unsigned char*)saved_key[i];
crypt_out[i] = obfuscateWord(p);
}
return count;
}
static void *get_binary(char *ciphertext)
{
static uint32_t *out;
if (!out)
out = mem_alloc_tiny(sizeof(uint32_t), MEM_ALIGN_WORD);
sscanf(&ciphertext[FORMAT_TAG_LEN], "%x", out);
return out;
}
static char *get_key(int index)
{
return saved_key[index];
}
#define COMMON_GET_HASH_VAR crypt_out
#include "common-get-hash.h"
struct fmt_main fmt_copilot = {
{
FORMAT_LABEL,
FORMAT_NAME,
ALGORITHM_NAME,
BENCHMARK_COMMENT,
BENCHMARK_LENGTH,
0,
PLAINTEXT_LENGTH,
BINARY_SIZE,
BINARY_ALIGN,
SALT_SIZE,
SALT_ALIGN,
MIN_KEYS_PER_CRYPT,
MAX_KEYS_PER_CRYPT,
FMT_CASE | FMT_TRUNC | FMT_8_BIT | FMT_NOT_EXACT,
{ NULL },
{ FORMAT_TAG },
tests
}, {
init,
done,
fmt_default_reset,
fmt_default_prepare,
valid,
fmt_default_split,
get_binary,
fmt_default_salt,
{ NULL },
fmt_default_source,
{
fmt_default_binary_hash_0,
fmt_default_binary_hash_1,
fmt_default_binary_hash_2,
fmt_default_binary_hash_3,
fmt_default_binary_hash_4,
fmt_default_binary_hash_5,
fmt_default_binary_hash_6
},
fmt_default_salt_hash,
NULL,
fmt_default_set_salt,
set_key,
get_key,
fmt_default_clear_keys,
crypt_all,
{
#define COMMON_GET_HASH_LINK
#include "common-get-hash.h"
},
cmp_all,
cmp_one,
cmp_exact
}
};
#endif /* plugin stanza */
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