Salt Explanation. | Bitcointalksearch.org

I have added several print statements throughout the source code to follow the path of encryption/decryption on the wallet. My questions are as follows:

   1. Why is the salt not the same in the bitcoin source code as the python program below? 6ec1691c413b52bb vs 0x26cde4d5880(salt)

Using bitcoin2john.py, I get the following string from wallet.dat.
$bitcoin
$64$
e8a8aa1de3da38001410635516891bc3d092063bd386acd867df457c8d842beb
$16$
6ec1691c413b52bb
$83782
$96$
d307ed1e99a72541b60cbcd6b9636e3f1d26b2311eb781f0c6d8b659895e5fe7b53af45edb312c3 764df8ccaac7b8a74
$66$
03fffeb3444e21170d74dcc58290e0914e59ec2b51dfac6a67465ba6dd6a7d262d

I have set several stream statements in the function to follow the path in crypter.cpp: The source code was pulled from github bitcoin source code location.

bool CCrypter::SetKeyFromPassphrase(const SecureString& strKeyData, const std::vector& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod)
{
   int roundcount = nRounds;
   int cryptokeysize = WALLET_CRYPTO_KEY_SIZE;
   int derivationmethod = nDerivationMethod;

   std::ofstream file3;
   file3.open ("C:\\workspace\\bitcoin\\usr\\local\\3.txt");
   file3 << "Made it here...Line3. (chsalt, strKeyData, nRounds, vchKey.data(), vchIV.data() \n";
   file3 << (int)roundcount;
   file3 << "(nrounds)\n";
   file3 << (int)cryptokeysize;
   file3 << "(keysize)\n";
   file3 << (int)derivationmethod;
   file3 << "(derivations)\n";

   if (nRounds < 1 )
   return false;

   int i = 0;
   if (nDerivationMethod == 0)
   i = BytesToKeySHA512AES(chSalt, strKeyData, nRounds, vchKey.data(), vchIV.data());

   file3 << i;
   file3 << "(nderivationmethod)\n";
   file3 << &vchKey;
   file3 << "(vchKey- memory cleanse)\n";
   file3 << vchKey.size();
   file3 << "(key size)\n";
   file3 << &vchIV;
   file3 << "(iv- memory cleanse)\n";
   file3 << vchIV.size();
   file3 << "(iv size)\n";
   file3 << &chSalt;
   file3 << "(salt)\n";
   file3 << chSalt.size();
   file3 << "(salt size)\n";
   file3 << &strKeyData;
   file3 << "(strkey)\n";
   file3 << strKeyData.size();
   file3 << "(strKeyData size)\n";

   if (i != (int)WALLET_CRYPTO_KEY_SIZE)
   {
   file3 << &vchKey;
   file3 << "(vchKey- memory cleanse2)\n";
   file3 << vchKey.size();
   file3 << "(key size2)\n";

   file3 << &vchIV;
   file3 << "(iv- memory cleanse2)\n";
   file3 << vchIV.size();
   file3 << "(iv size2)\n";

   memory_cleanse(vchKey.data(), vchKey.size());
   memory_cleanse(vchIV.data(), vchIV.size());
   return false;
   }

   file3 << (int)derivationmethod;
   file3 << "(derivation)\n";

   fKeySet = true;

   file3 << fKeySet;
   file3 << "(fKeySet)\n";
   file3.close();
   return true;
}

The results are as follows:
Made it here...Line3. (chsalt, strKeyData, nRounds, vchKey.data(), vchIV.data()
83782(nrounds)
32(keysize)
0(derivations)
32(nderivationmethod)
0xbd8edfa270(vchKey- memory cleanse)
32(key size)
0xbd8edfa288(iv- memory cleanse)
16(iv size)
0x26cde4d5880(salt)
8(salt size)
0xbd8edfa9c0(strkey)
16(strKeyData size)
0(derivation)
1(fKeySet)

Topic: Salt Explanation. (Read 175 times)