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This commit is contained in:
Igor Pavlov
2010-03-15 00:00:00 +00:00
committed by Kornel Lesiński
parent db5eb6d638
commit 993daef9cb
74 changed files with 5177 additions and 1736 deletions
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CPP/7zip/Crypto/ZipCrypto.cpp
+41 -81
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@@ -15,18 +15,26 @@ namespace NZip {
void CCipher::UpdateKeys(Byte b)
{
Keys[0] = CRC_UPDATE_BYTE(Keys[0], b);
Keys[1] += Keys[0] & 0xff;
Keys[1] = Keys[1] * 134775813L + 1;
Keys[1] = (Keys[1] + (Keys[0] & 0xFF)) * 0x8088405 + 1;
Keys[2] = CRC_UPDATE_BYTE(Keys[2], (Byte)(Keys[1] >> 24));
}
void CCipher::SetPassword(const Byte *password, UInt32 passwordLen)
STDMETHODIMP CCipher::CryptoSetPassword(const Byte *password, UInt32 passwordLen)
{
Keys[0] = 305419896L;
Keys[1] = 591751049L;
Keys[2] = 878082192L;
for (UInt32 i = 0; i < passwordLen; i++)
Keys[0] = 0x12345678;
Keys[1] = 0x23456789;
Keys[2] = 0x34567890;
UInt32 i;
for (i = 0; i < passwordLen; i++)
UpdateKeys(password[i]);
for (i = 0; i < 3; i++)
Keys2[i] = Keys[i];
return S_OK;
}
STDMETHODIMP CCipher::Init()
{
return S_OK;
}
Byte CCipher::DecryptByteSpec()
@@ -35,94 +43,46 @@ Byte CCipher::DecryptByteSpec()
return (Byte)((temp * (temp ^ 1)) >> 8);
}
Byte CCipher::DecryptByte(Byte b)
HRESULT CEncoder::WriteHeader(ISequentialOutStream *outStream, UInt32 crc)
{
Byte c = (Byte)(b ^ DecryptByteSpec());
UpdateKeys(c);
return c;
}
Byte CCipher::EncryptByte(Byte b)
{
Byte c = (Byte)(b ^ DecryptByteSpec());
UpdateKeys(b);
return c;
}
void CCipher::DecryptHeader(Byte *buf)
{
for (unsigned i = 0; i < kHeaderSize; i++)
buf[i] = DecryptByte(buf[i]);
}
void CCipher::EncryptHeader(Byte *buf)
{
for (unsigned i = 0; i < kHeaderSize; i++)
buf[i] = EncryptByte(buf[i]);
}
STDMETHODIMP CEncoder::CryptoSetPassword(const Byte *data, UInt32 size)
{
_cipher.SetPassword(data, size);
return S_OK;
}
STDMETHODIMP CEncoder::CryptoSetCRC(UInt32 crc)
{
_crc = crc;
return S_OK;
}
STDMETHODIMP CEncoder::Init()
{
return S_OK;
}
HRESULT CEncoder::WriteHeader(ISequentialOutStream *outStream)
{
Byte header[kHeaderSize];
g_RandomGenerator.Generate(header, kHeaderSize - 2);
header[kHeaderSize - 1] = Byte(_crc >> 24);
header[kHeaderSize - 2] = Byte(_crc >> 16);
_cipher.EncryptHeader(header);
return WriteStream(outStream, header, kHeaderSize);
Byte h[kHeaderSize];
g_RandomGenerator.Generate(h, kHeaderSize - 2);
h[kHeaderSize - 1] = (Byte)(crc >> 24);
h[kHeaderSize - 2] = (Byte)(crc >> 16);
RestoreKeys();
Filter(h, kHeaderSize);
return WriteStream(outStream, h, kHeaderSize);
}
STDMETHODIMP_(UInt32) CEncoder::Filter(Byte *data, UInt32 size)
{
UInt32 i;
for (i = 0; i < size; i++)
data[i] = _cipher.EncryptByte(data[i]);
return i;
}
STDMETHODIMP CDecoder::CryptoSetPassword(const Byte *data, UInt32 size)
{
_cipher.SetPassword(data, size);
return S_OK;
for (UInt32 i = 0; i < size; i++)
{
Byte b = data[i];
data[i] = (Byte)(b ^ DecryptByteSpec());;
UpdateKeys(b);
}
return size;
}
HRESULT CDecoder::ReadHeader(ISequentialInStream *inStream)
{
Byte header[kHeaderSize];
RINOK(ReadStream_FAIL(inStream, header, kHeaderSize));
_cipher.DecryptHeader(header);
return S_OK;
}
STDMETHODIMP CDecoder::Init()
{
Byte h[kHeaderSize];
RINOK(ReadStream_FAIL(inStream, h, kHeaderSize));
RestoreKeys();
Filter(h, kHeaderSize);
return S_OK;
}
STDMETHODIMP_(UInt32) CDecoder::Filter(Byte *data, UInt32 size)
{
UInt32 i;
for (i = 0; i < size; i++)
data[i] = _cipher.DecryptByte(data[i]);
return i;
for (UInt32 i = 0; i < size; i++)
{
Byte c = (Byte)(data[i] ^ DecryptByteSpec());
UpdateKeys(c);
data[i] = c;
}
return size;
}
}}