@David Nice! Stored that somewhere...
degski
On Sunday, September 16, 2012 1:35:18 PM UTC+3, David Irvine wrote:
> Here is an XOR filter if you wish to use xor in a transformation chain.
>
> const size_t kPadSize(YOURPADSIZEHERE);
>
> class XORFilter : public CryptoPP::Bufferless<CryptoPP::Filter> {
> public:
> XORFilter(CryptoPP::BufferedTransformation *attachment,
> byte *pad,
> const size_t &pad_size = kPadSize)
> : pad_(pad), count_(0), kPadSize_(pad_size) {
> CryptoPP::Filter::Detach(attachment);
> }
> size_t Put2(const byte* in_string,
> size_t length,
> int message_end,
> bool blocking) {
> if (length == 0) {
> return AttachedTransformation()->Put2(in_string, length, message_end,
> blocking);
> }
> boost::scoped_array<byte> buffer(new byte[length]);
>
> size_t i(0);
> for (; i != length; ++i) {
> buffer[i] = in_string[i] ^ pad_[count_ % kPadSize_];
> ++count_;
> }
>
> return AttachedTransformation()->Put2(buffer.get(), length, message_end,
> blocking);
> }
> bool IsolatedFlush(bool, bool) { return false; }
>
> private:
> XORFilter &operator = (const XORFilter&);
> XORFilter(const XORFilter&);
> byte *pad_;
> size_t count_;
> const size_t kPadSize_;
> };
>
> Best Regards
> David Irvine
>
>
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>
>
> On Sun, Sep 16, 2012 at 11:30 AM, degski <[email protected]
> <javascript:>>wrote:
>
>> Hi Shahram,
>>
>> This might not be what you mean, but the xor function is C/C++ is like:
>>
>> int x = 6544654, y = 9684296;
>>
>> x ^= y;
>>
>>
>> x now contains the xored value of x with y. For your strings, just do it
>> byte by byte.
>>
>> Cheers,
>>
>>
>> degski
>>
>>
>> On 16 September 2012 12:21, Shahram <[email protected] <javascript:>>wrote:
>>
>>> "Dear Jay Jay
>>>
>>> Thanks for your quick reply. But What I want is close to what you
>>> suggest. That's part of an SIP protocol with a "SHA256" hash function. I
>>> couldn't find XOR function in Crypto++ with the specification that I've
>>> mentioned before. Is it possible for you to help me in this way? Thanks
>>> again.
>>>
>>> On Sunday, September 16, 2012 12:00:02 AM UTC-7, Jay Jay wrote:
>>>>
>>>> I take it you want to encrypt a username with a password. Why roll your
>>>> own? DefaultEncryptorWithMAC will do this for you:
>>>>
>>>> Use like:
>>>>
>>>> template < typename F >
>>>> const string EncryptString ( const string& instr, const string&
>>>> passPhrase ) {
>>>>
>>>> string outstr;
>>>>
>>>> try {
>>>>
>>>> DefaultEncryptorWithMAC Encryptor ( passPhrase.c_str ( ), new F
>>>> ( new StringSink ( outstr ), false ) );
>>>> Encryptor.Put ( ( byte* ) instr.c_str ( ), instr.size ( ) );
>>>> Encryptor.MessageEnd ( );
>>>> }
>>>>
>>>> catch ( std::exception& e ) {
>>>>
>>>> cout << e.what ( ) << endl;
>>>>
>>>> exit ( 0 );
>>>> }
>>>>
>>>> return outstr;
>>>> }
>>>>
>>>> Where F is either HexEncoder or Base64Encoder.
>>>>
>>>> So call
>>>>
>>>> const string encrypted_username ( EncryptString<Base64Encoder> (
>>>> username, password ) );
>>>>
>>>> Cheers,
>>>>
>>>>
>>>> degski
>>>>
>>>> On 16 September 2012 09:21, Shahram <[email protected]> wrote:
>>>>
>>>>> Dear All
>>>>>
>>>>> Would you please help me to know how can I have a function with the
>>>>> following specification:
>>>>>
>>>>> Inputs: string username, password;
>>>>> output string F(username, password) = username XOR hash (password)
>>>>> where hash= SHA256 or anything else.
>>>>>
>>>>> And I need also to have and write the output down in hex . Thanks in
>>>>> advance.
>>>>>
>>>>> Regards
>>>>> Shahram
>>>>>
>>>>> --
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>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> "When I see a bird that walks like a duck and swims like a duck and
>>>> quacks like a duck, I call that bird a duck."
>>>>
>>>> - *James Whitcomb Riley*
>>>>
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>>
>>
>>
>>
>> --
>> "When I see a bird that walks like a duck and swims like a duck and
>> quacks like a duck, I call that bird a duck."
>>
>> - *James Whitcomb Riley*
>>
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