AESCryptoDemo question of strength.

I want to use AES 256bits encryption.

In the function AESCryptoDemoin fileDRBG.cpp 

DRBG::DRBG(GlobalContext & gc) :
   Crypto("DRBG"), context(gc), rngCtx(NULL) {
   int rc = hu_RngDrbgCreate(HU_DRBG_HASH, 112, false, 0, NULL, NULL, &rngCtx,
context.ctx());
  maybeLog("DRBGCreate", rc);
}

To change the 256 bit encryption just change 112 to 256?

I also need to change in the application user interface

QString ApplicationUI::generate() {
DRBG drbg(globalContext);
QByteArray buffer(16, 0);
int rc = drbg.getBytes(buffer);
if (rc != SB_SUCCESS) {
toast(
QString("Could not generate random bytes %1").arg(
SBError::getErrorText(rc)));
return "";
}
return toHex(buffer);
}

TO

QByteArray buffer(32, 0);

Oh Yes - only the key should change its size - not the IV. (IV must remain in the block size).

I have a bunch of changes planned for the demo... The community is open...

That is to say: you need to use iv.length () - enough to ensure that the iv is the right length. (an easy way to lead to the corruption of memory NOT to use the length of the buffer you are referring to...)

Tags: BlackBerry Developers

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