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adxcrypt_fmt_plug.c
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adxcrypt_fmt_plug.c
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/*
* JtR format to crack the IBM/Toshiba 4960 OS ADXCRYPT hashes.
*
* This software is Copyright (c) 2018, Dhiru Kholia <dhiru.kholia 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.
*
* The ADXCRYPT algorithm was reverse engineered by Dhiru Kholia on
* 15-August-2018.
*/
#if FMT_EXTERNS_H
extern struct fmt_main fmt_adxcrypt;
#elif FMT_REGISTERS_H
john_register_one(&fmt_adxcrypt);
#else
#include <string.h>
#ifdef _OPENMP
#include <omp.h>
#endif
#define OMP_SCALE 512 // tuned on i7-7820HQ
#include "formats.h"
#include "misc.h"
#include "common.h"
#include "formats.h"
#include "params.h"
#include "options.h"
#include "johnswap.h"
#define FORMAT_LABEL "adxcrypt"
#define FORMAT_NAME "IBM/Toshiba 4690"
#define FORMAT_TAG "$adxcrypt$"
#define FORMAT_TAG_LEN (sizeof(FORMAT_TAG)-1)
#define ALGORITHM_NAME "ADXCRYPT 32/" ARCH_BITS_STR
#define BENCHMARK_COMMENT ""
#define BENCHMARK_LENGTH 7
#define PLAINTEXT_LENGTH 8
#define BINARY_SIZE 8
#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 256
static struct fmt_tests adxcrypt_tests[] = {
{"$adxcrypt$54886955", "99999999"}, // default credentials
{"$adxcrypt$54886955", "786r"}, // collided password, works fine on a real system
{"$adxcrypt$43891846", "30"},
{"$adxcrypt$43691826", "31"},
{"$adxcrypt$43391806", "32"},
{NULL}
};
static char (*saved_key)[PLAINTEXT_LENGTH + 1];
static uint32_t (*crypt_out)[BINARY_SIZE / sizeof(uint32_t)];
static void init(struct fmt_main *self)
{
omp_autotune(self, OMP_SCALE);
saved_key = mem_calloc(self->params.max_keys_per_crypt,
sizeof(*saved_key));
crypt_out = mem_calloc(self->params.max_keys_per_crypt,
sizeof(*crypt_out));
}
static void done(void)
{
MEM_FREE(crypt_out);
MEM_FREE(saved_key);
}
static int valid(char *ciphertext, struct fmt_main *self)
{
int extra;
if (strncmp(ciphertext, FORMAT_TAG, FORMAT_TAG_LEN))
return 0;
// not strictly true
if (hexlenl(ciphertext + FORMAT_TAG_LEN, &extra) != 4 * 2 || extra)
goto err;
return 1;
err:
return 0;
}
static void *get_binary(char *ciphertext)
{
static union {
unsigned char c[BINARY_SIZE+1];
ARCH_WORD dummy;
} buf;
unsigned char *out = buf.c;
char *p;
p = strrchr(ciphertext, '$') + 1;
memcpy(out, p, 8);
return out;
}
#define COMMON_GET_HASH_VAR crypt_out
#include "common-get-hash.h"
/*
* This code looks weird as it is actually cleaned-up decompiled code.
*
* Known plain text = 30
* Cipher text = 43891846
*
* Known plain text = 31
* Cipher text = 43691826
*
* Known plain text = 32
* Cipher text = 43391806
*/
static void adxcrypt(char *input, unsigned char *output, int16_t length)
{
char *in;
int count;
int32_t idx;
uint32_t a, b;
union {
char b[8];
uint32_t w[2];
} buffer;
// setup work buffer
if (length > 0)
memcpy(buffer.b, input, length);
else
return; // -1100;
// handle "padding"
count = length;
while (count < 8) {
if (count < 8 && length > 0) {
in = input;
idx = 0;
do {
++idx;
buffer.b[count] = (*in++) + count;
count++;
} while (count < 8 && length > idx);
}
}
// loop
idx = 0;
#if ARCH_LITTLE_ENDIAN==1
a = (buffer.w[0] + buffer.w[1]) ^ 0xBEEFFACE;
#else
a = JOHNSWAP((buffer.w[0] + buffer.w[1]) ^ 0xCEFAEFBE);
#endif
do {
if ( (a & 0xF) <= 9 )
b = a & 0xF;
else
b = (a & 0xF) - 7;
++idx;
*output++ = b + 48;
a >>= 4;
} while ( idx < 8 );
}
static int crypt_all(int *pcount, struct db_salt *salt)
{
const int count = *pcount;
int index;
#ifdef _OPENMP
#pragma omp parallel for
#endif
for (index = 0; index < count; index++) {
adxcrypt(saved_key[index], (unsigned char*)crypt_out[index], strlen(saved_key[index]));
}
return count;
}
static int cmp_all(void *binary, int count)
{
int index;
for (index = 0; index < count; index++)
if (!memcmp(binary, crypt_out[index], ARCH_SIZE))
return 1;
return 0;
}
static int cmp_one(void *binary, int index)
{
return !memcmp(binary, crypt_out[index], BINARY_SIZE);
}
static int cmp_exact(char *source, int index)
{
return 1;
}
static void adxcrypt_set_key(char *key, int index)
{
strnzcpy(saved_key[index], key, sizeof(*saved_key));
}
static char *get_key(int index)
{
return saved_key[index];
}
struct fmt_main fmt_adxcrypt = {
{
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_OMP | FMT_NOT_EXACT,
{ NULL },
{ FORMAT_TAG },
adxcrypt_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,
adxcrypt_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 */