CWE-ou-minkata/Sources/Plasma/NucleusLib/pnEncryption/plChallengeHash.cpp

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*==LICENSE==*/

#include "plChallengeHash.h"
#include "pnUtils/pnUtils.h"

ShaDigest fSeed;

void CryptCreateRandomSeed(size_t length, uint8_t* data)
{
    uint32_t seedIdx = 0;
    uint32_t dataIdx = 0;
    uint32_t cur = 0;
    uint32_t end = max(length, sizeof(ShaDigest));

    // Combine seed with input data
    for (; cur < end; cur++) {
        fSeed[seedIdx] ^= data[dataIdx];

        if (++seedIdx >= sizeof(ShaDigest))
            seedIdx = 0;
        if (++dataIdx >= length)
            dataIdx = 0;
    }

    ((uint32_t*)fSeed)[2] ^= (uint32_t)((uintptr_t)&length);
    ((uint32_t*)fSeed)[3] ^= (uint32_t)length;
    ((uint32_t*)fSeed)[4] ^= (uint32_t)((uintptr_t)data);

    // Hash seed
    plSHAChecksum sum(sizeof(ShaDigest), (uint8_t*)fSeed);
    ShaDigest digest;
    memcpy(digest, sum.GetValue(), sizeof(ShaDigest));

    seedIdx = 0;
    dataIdx = 0;
    cur = 0;

    // Update output with contents of digest
    for (; cur < end; cur++) {
        data[dataIdx] ^= digest[seedIdx];

        if (++seedIdx >= sizeof(ShaDigest))
            seedIdx = 0;
        if (++dataIdx >= length)
            dataIdx = 0;
    }

    // Combine seed with digest
    for (size_t i = 0; i < sizeof(ShaDigest); i++) {
        fSeed[i] ^= digest[i];
    }
}

void CryptHashPassword(const plString& username, const plString& password, ShaDigest dest)
{
    plStringStream buf;
    buf << password.Left(password.GetSize() - 1) << '\0';
    buf << username.ToLower().Left(username.GetSize() - 1) << '\0';
    plStringBuffer<uint16_t> result = buf.GetString().ToUtf16();
    plSHAChecksum sum(result.GetSize() * sizeof(uint16_t), (uint8_t*)result.GetData());

    memcpy(dest, sum.GetValue(), sizeof(ShaDigest));
}

void CryptHashPasswordChallenge(uint32_t clientChallenge, uint32_t serverChallenge, ShaDigest namePassHash, ShaDigest challengeHash)
{
    plSHAChecksum sum;

    sum.Start();
    sum.AddTo(sizeof(uint32_t), (uint8_t*)&clientChallenge);
    sum.AddTo(sizeof(uint32_t), (uint8_t*)&serverChallenge);
    sum.AddTo(sizeof(ShaDigest), namePassHash);
    sum.Finish();

    memcpy(challengeHash, sum.GetValue(), sizeof(ShaDigest));
}