Done!! Now item 4) of my first post works fine.
Here is a part of my Signature.cpp :
static CryptoPP::AutoSeededRandomPool rng; //this fixed rng
troblues as David Irvine suggested
void Signature::SignHash() //method declared in my
Signature.h file
{
[...]
static RSA::PrivateKey RSAprivate;
RSAprivate.GenerateRandomWithKeySize(rng,1536);
static RSA::PublicKey RSApublic; //keys
created inside the method as Fraser suggested
//and not declared inside the class as Ingo Naumann suggested
[...]
}
I'm not sure that the key pair is generated only once ( as I want). I'm
going to verify that key pair is not re-generated every time i call the
method , because I have to sign every file with the same RSAprivate.
Thanks Everybody!!
Now I'm going to work on item 5) of my first post: perform the integrity
check of files (created/hashed/signed). I think that, because of I declared
my key pair as local static variables, I must implement a method
Signature::IntegrityCheck() inside my Signature.cpp, because outside of it
the keys will not be visible.......
Il giorno sabato 14 luglio 2012 21:44:24 UTC+2, Michele ha scritto:
>
> Ok David, now i'm deleting RNG from class members. I'm not sure that I've
> understand your example but i will try...
>
> Il giorno sabato 14 luglio 2012 19:08:07 UTC+2, David Irvine ha scritto:
>>
>> It seems you may not be using the RNG correctly. It's generally preferred
>> to have on per thread at least (or a global if you like). i.e. in test.cpp
>> you will see how this was done. In your case I am not sure you should have
>> a class member RNG used as you have. This can cause all sorts of issues
>> with threading and protection of the os provided generator etc.
>>
>> static OFB_Mode<AES>::Encryption s_globalRNG;
>>
>> RandomNumberGenerator & GlobalRNG()
>> {
>> return s_globalRNG;
>> }
>>
>> See the docs here http://www.cryptopp.com/wiki/RandomNumberGenerator
>>
>> Best Regards
>> David Irvine
>>
>>
>> On Sat, Jul 14, 2012 at 5:53 PM, Michele <[email protected]>wrote:
>>
>>> RSA::PrivateKey RSAprivate;
>>> string DigitalSIgn;
>>>
>>
>>
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