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AES Crypt Plugin: Replaced naive with true UTF8 to UTF16 conversion, reduced max password length to 128 and improved performance

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This commit is contained in:
Jens Steube 2021-05-21 22:12:32 +02:00
parent df8a773341
commit 0a6080505b
3 changed files with 23 additions and 38 deletions
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45
OpenCL/m22400-pure.cl
View File

@ -26,7 +26,7 @@ typedef struct aescrypt
typedef struct aescrypt_tmp
{
u32 pass[144];
u32 pass[80];
int len;
} aescrypt_tmp_t;
@ -50,36 +50,13 @@ KERNEL_FQ void m22400_init (KERN_ATTR_TMPS_ESALT (aescrypt_tmp_t, aescrypt_t))
s[2] = salt_bufs[SALT_POS].salt_buf[2];
s[3] = salt_bufs[SALT_POS].salt_buf[3];
// convert password to utf16le:
const u32 pw_len = pws[gid].pw_len;
const u32 pw_len_utf16le = pw_len * 2;
u32 w[80] = { 0 };
u32 w[144] = { 0 };
for (u32 i = 0, j = 0; i < 64; i += 4, j += 8)
for (u32 i = 0, j = 0; i < pw_len; i += 4, j += 1)
{
u32 in[4];
in[0] = pws[gid].i[i + 0];
in[1] = pws[gid].i[i + 1];
in[2] = pws[gid].i[i + 2];
in[3] = pws[gid].i[i + 3];
u32 out0[4];
u32 out1[4];
make_utf16le_S (in, out0, out1);
w[j + 0] = hc_swap32_S (out0[0]);
w[j + 1] = hc_swap32_S (out0[1]);
w[j + 2] = hc_swap32_S (out0[2]);
w[j + 3] = hc_swap32_S (out0[3]);
w[j + 4] = hc_swap32_S (out1[0]);
w[j + 5] = hc_swap32_S (out1[1]);
w[j + 6] = hc_swap32_S (out1[2]);
w[j + 7] = hc_swap32_S (out1[3]);
w[j] = hc_swap32_S (pws[gid].i[j]);
}
// sha256:
@ -88,7 +65,7 @@ KERNEL_FQ void m22400_init (KERN_ATTR_TMPS_ESALT (aescrypt_tmp_t, aescrypt_t))
sha256_init (&ctx);
sha256_update (&ctx, s, 32);
sha256_update (&ctx, w, pw_len_utf16le);
sha256_update (&ctx, w, pw_len);
sha256_final (&ctx);
// set tmps:
@ -110,7 +87,7 @@ KERNEL_FQ void m22400_init (KERN_ATTR_TMPS_ESALT (aescrypt_tmp_t, aescrypt_t))
w[6] = ctx.h[6];
w[7] = ctx.h[7];
const u32 final_len = 32 + pw_len_utf16le;
const u32 final_len = 32 + pw_len;
const u32 idx_floor = (final_len / 64) * 16;
const u32 idx_ceil = ((final_len & 63) >= 56) ? idx_floor + 16 : idx_floor;
@ -123,7 +100,7 @@ KERNEL_FQ void m22400_init (KERN_ATTR_TMPS_ESALT (aescrypt_tmp_t, aescrypt_t))
#ifdef _unroll
#pragma unroll
#endif
for (u32 i = 0; i < 144; i++)
for (u32 i = 0; i < 80; i++)
{
tmps[gid].pass[i] = w[i];
}
@ -139,17 +116,17 @@ KERNEL_FQ void m22400_loop (KERN_ATTR_TMPS_ESALT (aescrypt_tmp_t, aescrypt_t))
// init
u32 w[144];
u32 w[80];
#ifdef _unroll
#pragma unroll
#endif
for (u32 i = 0; i < 144; i++)
for (u32 i = 0; i < 80; i++)
{
w[i] = tmps[gid].pass[i];
}
const int pw_len = tmps[gid].len;
const int len = tmps[gid].len;
// main loop
@ -174,7 +151,7 @@ KERNEL_FQ void m22400_loop (KERN_ATTR_TMPS_ESALT (aescrypt_tmp_t, aescrypt_t))
int left;
int idx;
for (left = pw_len, idx = 0; left >= 56; left -= 64, idx += 16)
for (left = len, idx = 0; left >= 56; left -= 64, idx += 16)
{
w0[0] = w[idx + 0];
w0[1] = w[idx + 1];

14
src/modules/module_22400.c
View File

@ -20,7 +20,8 @@ static const u32 HASH_CATEGORY = HASH_CATEGORY_FDE;
static const char *HASH_NAME = "AES Crypt (SHA256)";
static const u64 KERN_TYPE = 22400;
static const u32 OPTI_TYPE = 0;
static const u64 OPTS_TYPE = OPTS_TYPE_PT_GENERATE_LE;
static const u64 OPTS_TYPE = OPTS_TYPE_PT_GENERATE_LE
| OPTS_TYPE_POST_AMP_UTF16LE;
static const u32 SALT_TYPE = SALT_TYPE_EMBEDDED;
static const char *ST_PASS = "hashcat";
static const char *ST_HASH = "$aescrypt$1*efc648908ca7ec727f37f3316dfd885c*eff5c87a35545406a57b56de57bd0554*3a66401271aec08cbd10cf2070332214093a33f36bd0dced4a4bb09fab817184*6a3c49fea0cafb19190dc4bdadb787e73b1df244c51780beef912598bd3bdf7e";
@ -54,13 +55,20 @@ typedef struct aescrypt
typedef struct aescrypt_tmp
{
u32 pass[144];
u32 pass[80];
int len;
} aescrypt_tmp_t;
static const char *SIGNATURE_AESCRYPT = "$aescrypt$";
u32 module_pw_max (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
{
const u32 pw_max = 128;
return pw_max;
}
char *module_jit_build_options (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra, MAYBE_UNUSED const hashes_t *hashes, MAYBE_UNUSED const hc_device_param_t *device_param)
{
char *jit_build_options = NULL;
@ -338,7 +346,7 @@ void module_init (module_ctx_t *module_ctx)
module_ctx->module_potfile_disable = MODULE_DEFAULT;
module_ctx->module_potfile_keep_all_hashes = MODULE_DEFAULT;
module_ctx->module_pwdump_column = MODULE_DEFAULT;
module_ctx->module_pw_max = MODULE_DEFAULT;
module_ctx->module_pw_max = module_pw_max;
module_ctx->module_pw_min = MODULE_DEFAULT;
module_ctx->module_salt_max = MODULE_DEFAULT;
module_ctx->module_salt_min = MODULE_DEFAULT;

2
tools/test_modules/m22400.pm
View File

@ -12,7 +12,7 @@ use Digest::SHA qw (sha256);
use Digest::HMAC qw (hmac_hex);
use Encode;
sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
sub module_constraints { [[0, 128], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
sub module_generate_hash
{