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it's possible to crack scrypt on GPU even with higher scrypt setting

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the trick is to intentionally under-utilize the GPU warps
120H/s on my 4*1080: https://pastebin.com/z124G2cN
This commit is contained in:
Jens Steube 2017-06-04 15:49:09 +02:00
parent 0c5b53d266
commit 3d888b6b2d
3 changed files with 27 additions and 19 deletions
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4
hashcat.hctune
View File

@ -473,6 +473,6 @@ DEVICE_TYPE_CPU * 8900 1 1
DEVICE_TYPE_CPU * 9300 1 1 1
DEVICE_TYPE_CPU * 15700 1 1 1
DEVICE_TYPE_GPU * 8900 1 8 1
DEVICE_TYPE_GPU * 9300 1 8 1
DEVICE_TYPE_GPU * 8900 1 16 1
DEVICE_TYPE_GPU * 9300 1 16 1
DEVICE_TYPE_GPU * 15700 1 1 1

20
src/interface.c
View File

@ -23515,9 +23515,23 @@ u32 hashconfig_get_kernel_threads (hashcat_ctx_t *hashcat_ctx, const hc_device_p
u32 kernel_threads = MIN (KERNEL_THREADS_MAX, device_param->device_maxworkgroup_size);
if (hashconfig->hash_mode == 8900) kernel_threads = 64; // Scrypt
if (hashconfig->hash_mode == 9300) kernel_threads = 64; // Scrypt
if (hashconfig->hash_mode == 15700) kernel_threads = 64; // Scrypt
if ((hashconfig->hash_mode == 8900) || (hashconfig->hash_mode == 9300) || (hashconfig->hash_mode == 15700))
{
const hashes_t *hashes = hashcat_ctx->hashes;
const u32 scrypt_r = hashes->salts_buf[0].scrypt_r;
const u32 scrypt_p = hashes->salts_buf[0].scrypt_p;
const u32 scrypt_l = scrypt_r * scrypt_p;
if (scrypt_l)
{
kernel_threads = 256 / scrypt_l;
}
else
{
kernel_threads = 256;
}
}
if (device_param->device_type & CL_DEVICE_TYPE_CPU)
{

22
src/opencl.c
View File

@ -3685,11 +3685,12 @@ int opencl_session_begin (hashcat_ctx_t *hashcat_ctx)
hashconfig->tmp_size = scrypt_tmp_size;
u32 tmto_start = 0;
u32 tmto_stop = 10;
u32 tmto_stop = 5;
if (user_options->scrypt_tmto)
{
tmto_start = user_options->scrypt_tmto;
tmto_stop = user_options->scrypt_tmto;
}
else
{
@ -3718,17 +3719,6 @@ int opencl_session_begin (hashcat_ctx_t *hashcat_ctx)
tmto_start = 4;
}
}
else if (hashconfig->hash_mode == 15700)
{
if (device_param->device_vendor_id == VENDOR_ID_AMD)
{
tmto_start = 5;
}
else if (device_param->device_vendor_id == VENDOR_ID_NV)
{
tmto_start = 6;
}
}
}
const u32 kernel_power_max = device_param->hardware_power * device_param->kernel_accel_max;
@ -3772,9 +3762,11 @@ int opencl_session_begin (hashcat_ctx_t *hashcat_ctx)
+ size_tm
+ size_tmps;
bool not_enough_memory = true;
u32 tmto;
for (tmto = tmto_start; tmto < tmto_stop; tmto++)
for (tmto = tmto_start; tmto <= tmto_stop; tmto++)
{
size_scrypt = (128 * scrypt_r) * scrypt_N;
@ -3801,10 +3793,12 @@ int opencl_session_begin (hashcat_ctx_t *hashcat_ctx)
scrypt_tmto_final = tmto;
}
not_enough_memory = false;
break;
}
if (tmto == tmto_stop)
if (not_enough_memory == true)
{
event_log_error (hashcat_ctx, "Cannot allocate enough device memory.");