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

/*==LICENSE==*

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*==LICENSE==*/
#include "plChecksum.h"
#include "hsStream.h"

#include <cstring>


static uint8_t IHexCharToInt(char c)
{
    switch( c )
    {
        // yes, it's ugly, but it'll be fast :)
        case '0': return 0;
        case '1': return 1;
        case '2': return 2;
        case '3': return 3;
        case '4': return 4;
        case '5': return 5;
        case '6': return 6;
        case '7': return 7;
        case '8': return 8;
        case '9': return 9;

        case 'a': return 10;
        case 'b': return 11;
        case 'c': return 12;
        case 'd': return 13;
        case 'e': return 14;
        case 'f': return 15;

        case 'A': return 10;
        case 'B': return 11;
        case 'C': return 12;
        case 'D': return 13;
        case 'E': return 14;
        case 'F': return 15;
    }

    return 0xff;
}

plChecksum::plChecksum(unsigned int bufsize, const char* buffer)
{
    unsigned int wndsz = GetWindowSize(),i = 0;
    fSum = 0;

    const char* bufferAbsEnd = buffer + bufsize;
    const char* bufferEnvenEnd = buffer + bufsize - (bufsize % wndsz);

    while (buffer < bufferEnvenEnd)
    {
        fSum += hsToLE32(*((SumStorage*)buffer));
        buffer += wndsz;
    }

    SumStorage last = 0;
    while (buffer < bufferAbsEnd)
    {
        ((char*)&last)[i % wndsz] = *buffer;
        buffer++;
    }
    fSum+= hsToLE32(last);
}

//============================================================================

plMD5Checksum::plMD5Checksum(size_t size, uint8_t* buffer)
{
    fValid = false;
    Start();
    AddTo(size, buffer);
    Finish();
}

plMD5Checksum::plMD5Checksum()
{
    Clear();
}

plMD5Checksum::plMD5Checksum(const plMD5Checksum& rhs)
{
    memset(&fContext, 0, sizeof(fContext));
    memcpy(fChecksum, rhs.fChecksum, sizeof(fChecksum));
    fValid = rhs.fValid;
}

plMD5Checksum::plMD5Checksum(const plFileName& fileName)
{
    CalcFromFile(fileName);
}

plMD5Checksum::plMD5Checksum(hsStream* stream)
{
    CalcFromStream(stream);
}

void plMD5Checksum::Clear()
{
    memset(&fContext, 0, sizeof(fContext));
    memset(fChecksum, 0, sizeof(fChecksum));
    fValid = false;
}

void plMD5Checksum::CalcFromFile(const plFileName& fileName)
{
    hsUNIXStream s;
    fValid = false;

    if (s.Open(fileName))
    {
        CalcFromStream(&s);
        s.Close();
    }
}

void plMD5Checksum::CalcFromStream(hsStream* stream)
{
    uint32_t sPos = stream->GetPosition();
    unsigned loadLen = 1024 * 1024;
    Start();

    uint8_t *buf = new uint8_t[loadLen];

    while (int read = stream->Read(loadLen, buf))
        AddTo(read, buf);
    delete[] buf;

    Finish();
    stream->SetPosition(sPos);
}

void plMD5Checksum::Start()
{
    MD5_Init(&fContext);
    fValid = false;
}

void plMD5Checksum::AddTo(size_t size, const uint8_t* buffer)
{
    MD5_Update(&fContext, buffer, size);
}

void plMD5Checksum::Finish()
{
    MD5_Final(fChecksum, &fContext);
    fValid = true;
    memset(&fContext, 0, sizeof(fContext));
}

const char* plMD5Checksum::GetAsHexString() const
{
    const int   kHexStringSize = (2 * MD5_DIGEST_LENGTH) + 1;
    static char tempString[kHexStringSize];

    int     i;
    char    *ptr;


    hsAssert(fValid, "Trying to get string version of invalid checksum");

    for (i = 0, ptr = tempString; i < sizeof(fChecksum); i++, ptr += 2)
        sprintf(ptr, "%02x", fChecksum[i]);

    *ptr = 0;

    return tempString;
}

void plMD5Checksum::SetFromHexString(const char* string)
{
    const char  *ptr;
    int         i;


    hsAssert(strlen(string) == 2 * MD5_DIGEST_LENGTH, "Invalid string in MD5Checksum Set()");

    for (i = 0, ptr = string; i < sizeof(fChecksum); i++, ptr += 2)
        fChecksum[i] = (IHexCharToInt(ptr[0]) << 4) | IHexCharToInt(ptr[1]);

    fValid = true;
}

void plMD5Checksum::SetValue(uint8_t* checksum)
{
    fValid = true;
    memcpy(fChecksum, checksum, sizeof(fChecksum));
}

bool plMD5Checksum::operator==(const plMD5Checksum& rhs) const
{
    return (fValid && rhs.fValid && memcmp(fChecksum, rhs.fChecksum, sizeof(fChecksum)) == 0);
}

//============================================================================

plSHAChecksum::plSHAChecksum(size_t size, uint8_t* buffer)
{
    fValid = false;
    Start();
    AddTo(size, buffer);
    Finish();
}

plSHAChecksum::plSHAChecksum()
{
    Clear();
}

plSHAChecksum::plSHAChecksum(const plSHAChecksum& rhs)
{
    memset(&fContext, 0, sizeof(fContext));
    memcpy(fChecksum, rhs.fChecksum, sizeof(fChecksum));
    fValid = rhs.fValid;
}

plSHAChecksum::plSHAChecksum(const plFileName& fileName)
{
    CalcFromFile(fileName);
}

plSHAChecksum::plSHAChecksum(hsStream* stream)
{
    CalcFromStream(stream);
}

void plSHAChecksum::Clear()
{
    memset(&fContext, 0, sizeof(fContext));
    memset(fChecksum, 0, sizeof(fChecksum));
    fValid = false;
}

void plSHAChecksum::CalcFromFile(const plFileName& fileName)
{
    hsUNIXStream s;
    fValid = false;

    if (s.Open(fileName))
    {
        CalcFromStream(&s);
        s.Close();
    }
}

void plSHAChecksum::CalcFromStream(hsStream* stream)
{
    uint32_t sPos = stream->GetPosition();
    unsigned loadLen = 1024 * 1024;
    Start();

    uint8_t* buf = new uint8_t[loadLen];

    while (int read = stream->Read(loadLen, buf))
    {
        AddTo( read, buf );
    }
    delete[] buf;

    Finish();
    stream->SetPosition(sPos);
}

void plSHAChecksum::Start()
{
    SHA_Init(&fContext);
    fValid = false;
}

void plSHAChecksum::AddTo(size_t size, const uint8_t* buffer)
{
    SHA_Update(&fContext, buffer, size);
}

void plSHAChecksum::Finish()
{
    SHA_Final(fChecksum, &fContext);
    fValid = true;
    memset(&fContext, 0, sizeof(fContext));
}

const char* plSHAChecksum::GetAsHexString() const
{
    const int kHexStringSize = (2 * SHA_DIGEST_LENGTH) + 1;
    static char tempString[kHexStringSize];

    int i;
    char* ptr;

    hsAssert(fValid, "Trying to get string version of invalid checksum");

    for (i = 0, ptr = tempString; i < sizeof(fChecksum); i++, ptr += 2)
        sprintf(ptr, "%02x", fChecksum[i]);

    *ptr = 0;

    return tempString;
}

void plSHAChecksum::SetFromHexString(const char* string)
{
    const char* ptr;
    int         i;

    hsAssert(strlen(string) == (2 * SHA_DIGEST_LENGTH), "Invalid string in SHAChecksum Set()");

    for (i = 0, ptr = string; i < sizeof(fChecksum); i++, ptr += 2)
        fChecksum[i] = (IHexCharToInt(ptr[0]) << 4) | IHexCharToInt(ptr[1]);

    fValid = true;
}

void plSHAChecksum::SetValue(uint8_t* checksum)
{
    fValid = true;
    memcpy(fChecksum, checksum, sizeof(fChecksum));
}

bool plSHAChecksum::operator==(const plSHAChecksum& rhs) const
{
    return (fValid && rhs.fValid && memcmp(fChecksum, rhs.fChecksum, sizeof(fChecksum)) == 0);
}

//============================================================================

plSHA1Checksum::plSHA1Checksum(size_t size, const uint8_t* buffer)
{
    fValid = false;
    Start();
    AddTo(size, buffer);
    Finish();
}

plSHA1Checksum::plSHA1Checksum()
{
    Clear();
}

plSHA1Checksum::plSHA1Checksum(const plSHA1Checksum& rhs)
{
    memset(&fContext, 0, sizeof(fContext));
    memcpy(fChecksum, rhs.fChecksum, sizeof(fChecksum));
    fValid = rhs.fValid;
}

plSHA1Checksum::plSHA1Checksum(const plFileName& fileName)
{
    CalcFromFile(fileName);
}

plSHA1Checksum::plSHA1Checksum(hsStream* stream)
{
    CalcFromStream(stream);
}

void plSHA1Checksum::Clear()
{
    memset(fChecksum, 0, sizeof(fChecksum));
    fValid = false;
    memset(&fContext, 0, sizeof(fContext));
}

void plSHA1Checksum::CalcFromFile(const plFileName& fileName)
{
    hsUNIXStream s;
    fValid = false;

    if (s.Open(fileName))
    {
        CalcFromStream(&s);
        s.Close();
    }
}

void plSHA1Checksum::CalcFromStream(hsStream* stream)
{
    uint32_t sPos = stream->GetPosition();
    unsigned loadLen = 1024 * 1024;
    Start();

    uint8_t* buf = new uint8_t[loadLen];

    while (int read = stream->Read(loadLen, buf))
    {
        AddTo( read, buf );
    }
    delete[] buf;

    Finish();
    stream->SetPosition(sPos);
}

void plSHA1Checksum::Start()
{
    SHA1_Init(&fContext);
    fValid = false;
}

void plSHA1Checksum::AddTo(size_t size, const uint8_t* buffer)
{
    SHA1_Update(&fContext, buffer, size);
}

void plSHA1Checksum::Finish()
{
    SHA1_Final(fChecksum, &fContext);
    fValid = true;
    memset(&fContext, 0, sizeof(fContext));
}

const char* plSHA1Checksum::GetAsHexString() const
{
    const int kHexStringSize = (2 * SHA_DIGEST_LENGTH) + 1;
    static char tempString[kHexStringSize];

    int i;
    char* ptr;

    hsAssert(fValid, "Trying to get string version of invalid checksum");

    for (i = 0, ptr = tempString; i < sizeof(fChecksum); i++, ptr += 2)
        sprintf(ptr, "%02x", fChecksum[i]);

    *ptr = 0;

    return tempString;
}

void plSHA1Checksum::SetFromHexString(const char* string)
{
    const char* ptr;
    int         i;

    hsAssert(strlen(string) == (2 * SHA_DIGEST_LENGTH), "Invalid string in SHA1Checksum Set()");

    for (i = 0, ptr = string; i < sizeof(fChecksum); i++, ptr += 2)
        fChecksum[i] = (IHexCharToInt(ptr[0]) << 4) | IHexCharToInt(ptr[1]);

    fValid = true;
}

void plSHA1Checksum::SetValue(uint8_t* checksum)
{
    fValid = true;
    memcpy(fChecksum, checksum, sizeof(fChecksum));
}

bool plSHA1Checksum::operator==(const plSHA1Checksum& rhs) const
{
    return (fValid && rhs.fValid && memcmp(fChecksum, rhs.fChecksum, sizeof(fChecksum)) == 0);
}