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RAS MD5 Tweaks; #359

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Disable Fist Byte Correction on MD5 password hash following observations based on real world system;

Improve BPTC127x77 Decoder Logic;

Tweak Debug code to show checksum diff if there is no actual diff;
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lwvmobile
2026-09-04 21:36:45 -04:00
parent f2254f413a
commit fb3dc75c47
3 changed files with 181 additions and 101 deletions
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27
src/crypt-md5.c
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@@ -432,19 +432,22 @@ void ras_effective_key_creation(dsd_state * state, char * input)
ctx.digest[6] += 2;
}
//SEED low5 non-zero value (no change to 5-bit EMB checksum mod 31)
if ((ctx.digest[0] & 0x1F) == 0)
{
fprintf (stderr, " Byte %d: %02X -> %02X; ", 1, ctx.digest[0], ctx.digest[0]+2);
ctx.digest[0] += 2;
}
//UPDATE: I have now observed a system that has a 5-bit differential value of 0
//so that means that the low5 effective key value can be either 0, or 0x1F
//SEED low5 plus 1F (no change to 5-bit EMB checksum mod 31)
else if ((ctx.digest[0] & 0x1F) == 0x1F)
{
fprintf (stderr, " Byte %d: %02X -> %02X; ", 1, ctx.digest[0], ctx.digest[0]+2);
ctx.digest[0] += 2;
}
// //SEED low5 non-zero value (no change to 5-bit EMB checksum mod 31)
// if ((ctx.digest[0] & 0x1F) == 0)
// {
// fprintf (stderr, " Byte %d: %02X -> %02X; ", 1, ctx.digest[0], ctx.digest[0]+2);
// ctx.digest[0] += 2;
// }
// //SEED low5 plus 1F (no change to 5-bit EMB checksum mod 31)
// else if ((ctx.digest[0] & 0x1F) == 0x1F)
// {
// fprintf (stderr, " Byte %d: %02X -> %02X; ", 1, ctx.digest[0], ctx.digest[0]+2);
// ctx.digest[0] += 2;
// }
unsigned long long int effective_key = 0;
for (int i = 0; i < 7; i++)