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Code Issues Releases Wiki Activity

Reduce false positive reports from -m 21800

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This commit is contained in:
Jens Steube 2021-11-22 19:58:08 +01:00
parent b86f30c940
commit 3310707eb4
1 changed files with 22 additions and 3 deletions
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25
OpenCL/m21800-pure.cl
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@ -580,7 +580,7 @@ KERNEL_FQ void m21800_comp (KERN_ATTR_TMPS_ESALT (electrum_tmp_t, electrum_t))
#define OUT_SIZE 1024 #define OUT_SIZE 1024
u8 tmp[OUT_SIZE] = { 0 }; u8 tmp[OUT_SIZE];
infstream.avail_out = OUT_SIZE; infstream.avail_out = OUT_SIZE;
infstream.next_out = tmp; infstream.next_out = tmp;
@ -599,6 +599,25 @@ KERNEL_FQ void m21800_comp (KERN_ATTR_TMPS_ESALT (electrum_tmp_t, electrum_t))
return; return;
} }
for (int i = 1; i < infstream.total_out; i++)
{
if (tmp[i] == '\t') continue;
if (tmp[i] == '\r') continue;
if (tmp[i] == '\n') continue;
if (tmp[i] < 0x20)
{
// https://datatracker.ietf.org/doc/html/rfc7159
// 7. Strings
// All Unicode characters may be placed within the
// quotation marks, except for the characters that must be escaped:
// quotation mark, reverse solidus, and the control characters (U+0000
// through U+001F).
if (tmp[i - 1] != '\\') return;
}
}
/* /*
* Check with some strange signature. * Check with some strange signature.
* The main problem is that the (invalid) decrypted data processed by zlib often results in random patterns but with low entropy, * The main problem is that the (invalid) decrypted data processed by zlib often results in random patterns but with low entropy,
@ -619,7 +638,7 @@ KERNEL_FQ void m21800_comp (KERN_ATTR_TMPS_ESALT (electrum_tmp_t, electrum_t))
int qcnt2 = 0; int qcnt2 = 0;
int ccnt2 = 0; int ccnt2 = 0;
for (int i = 1; i < 1024; i++) for (int i = 1; i < infstream.total_out; i++)
{ {
if (tmp[i] == '"') qcnt2++; if (tmp[i] == '"') qcnt2++;
if (tmp[i] == ':') ccnt2++; if (tmp[i] == ':') ccnt2++;
@ -627,7 +646,7 @@ KERNEL_FQ void m21800_comp (KERN_ATTR_TMPS_ESALT (electrum_tmp_t, electrum_t))
if ((qcnt1 >= 1) && (ccnt1 >= 1) && (qcnt2 >= 4) && (ccnt2 >= 3)) if ((qcnt1 >= 1) && (ccnt1 >= 1) && (qcnt2 >= 4) && (ccnt2 >= 3))
{ {
const float entropy = hc_get_entropy ((const u32 *) tmp, 256); const float entropy = hc_get_entropy ((const u32 *) tmp, infstream.total_out / 4);
if ((entropy >= MIN_ENTROPY) && (entropy <= MAX_ENTROPY)) if ((entropy >= MIN_ENTROPY) && (entropy <= MAX_ENTROPY))
{ {