Hello,
I've recently encountered some kind of undefined behaviour and tried to ask
a question
<http://stackoverflow.com/questions/39251961/cryptography-bizzare-behaviour-in-release-mode>
on Stackoverflow. The answers were kind of expected...
I have a few programs in one solution and have another library using
CryptoPP classes and adding functionality.
After days of debugging and checking out various possible causes, I've came
to the conclusion that either something is wrong in the "UncheckedSetKey"
function or I am still clueless.
Debugging simultaneously with two Visual Studios (2015 - SP3) through the
same solution with different programs it showed that the values show a
first difference at this line:
while (true)
{
rk[keylen/4] = rk[0] ^ _mm_extract_epi32(_mm_aeskeygenassist_si128(temp,
0), 3) ^ *(rc++); //<--- Here
While this loop is being run quite a few times, it appears to be that the
array/pointer to array "rc" is out of bounds. The array itself is declared
and initialized with 10 values.
static const word32 rcLE[] = {
0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80,
0x1B, 0x36, /* for 128-bit blocks, Rijndael never uses more than 10
rcon values */
};
const word32 *rc = rcLE;
Obviously it appears that some random memory area is being accessed.
I cannot spot any kind of error or misuse of CryptoPP in the "faulty"
program.
Strange enough, the other programs do not seem to have any issues.
This behaviour is the same in 32 AND 64-bit.
Do I see this right ? Or are there by chance some wrong settings / compiler
flags causing this ?
Regards,
Florian
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