OK, now i'm sure that i generate a pair RSAprivate/RSApublic of valid keys.
My new signing function is:
void Sign::SignHash( string Digest)
{
RSASS < PSS , SHA1 >::Signer Signer(RSAprivate);
StringSource( Digest, true, new SignerFilter( RNG, Signer, new
StringSink(Sign ) ) );
}
It crashes again in a Segmentation fault; i tried to fix this using
Redirector (as my previous post)...another Segmentation fault...
Il giorno sabato 14 luglio 2012 16:02:33 UTC+2, Michele ha scritto:
>
> Hi Fraser, you are right!!
>
> I've just tried ( sorry for my english) your "checking code" and the
> result is false twice. So i modified my code with that you suggested, in
> previous email:
>
> [...]
>
> 1. RSA::PrivateKey RSAprivate;
> 2. RSAprivate.GenerateRandomWithKeySize(RNG,2048);
> 3. RSA::PublicKey RSApublic(RSAprivate);
>
> [...]
>
> Now it can't compile because of an error in 2.line : "expected contructor,
> destructor, or type conversion before ' . ' token". Now i'm reading keys
> and formats to fix this... thanks for your help!
>
> Cheers, Michele.
>
>
> Il giorno sabato 14 luglio 2012 15:06:12 UTC+2, Fraser ha scritto:
>>
>> Hi Michele,
>>
>> Yes, you're only constructing the private key here, and then initialising
>> the public key with an invalid private key, which makes the public key
>> invalid also. The keys are not being *generated* here.
>>
>> Inside Signature::SignHash, try adding the following to check:
>>
>> bool valid_private(RSAprivate.Validate(RNG, 0));
>> bool valid_public(RSApublic.Validate(RNG, 0));
>> if (!valid_private || !valid_public) {
>> std::cerr << std::boolalpha << "Valid private key: " << valid_private
>> << " Valid public key: " << valid_public << '\n';
>> return;
>> }
>>
>> So, somewhere before you first use the keys, you need to generate them,
>> as per my previous email. For more info, see
>> http://www.cryptopp.com/wiki/Keys_and_Formats#Generating.2C_Validating.2C_Saving.2C_and_Loading_Keys
>>
>> Cheers,
>> Fraser.
>>
>>
>> On 14/07/2012 09:47, Michele wrote:
>>
>> Yes, before calling Signature::SignHash i generate my keys with that code
>>
>> CryptoPP::RSA::PrivateKey RSAPrivate; //private key
>> generating
>> CryptoPP::RSA::PublicKey RSAPublic(RSAPrivate); //public key
>> generating
>>
>> I took this code in a wiki sample and i tested it in a stand alone
>> project and it worked. Your advice is to modify this code with that you
>> wrote?
>>
>> Cheers, Michele
>>
>> Il giorno sabato 14 luglio 2012 02:56:48 UTC+2, Fraser ha scritto:
>>>
>>> Hi Michele,
>>>
>>> I take it that before you call Signature::SignHash, you *are*generating
>>> your private and public keys? Something like:
>>>
>>> RSAprivate.GenerateRandomWithKeySize(RNG, 2048);
>>> RSApublic = CryptoPP::RSA::PublicKey(RSAprivate);
>>>
>>> Cheers,
>>> Fraser.
>>>
>>> On 13/07/2012 10:56, Michele wrote:
>>>
>>> Hi,
>>> I'm working on a simple project on KDevelop (linux Slackware virtual
>>> machine, on a Windows 7 host). I have to write a C++ code that : 1) creates
>>> a folder; 2) creates a number of text files in that folder; 3) Calculates a
>>> hash of each file with RIPEMD128; 4) Signs each hash with RSA ; 5)performs
>>> an integrity check if requested.
>>> I'm using Cryptopp 5.6.1 for RIPEMD128 and RSA functions.
>>> I realized and tested points 1) 2) and 3). I realized and tested point
>>> 4) following CryptoPP Signature Scheme Wiki:
>>> http://www.cryptopp.com/wiki/RSA_Signature_Schemes, and it works fine.
>>> Now i'm trying to integrate point 4) with the project and i realized the
>>> following "signing function":
>>>
>>> CrypoPP::AutoSeededRandomPool RNG;
>>>
>>> CryptoPP::RSA::PrivateKey RSAprivate;
>>> CryptoPP::RSA::PublicKey RSApublic ( RSAprivate);
>>>
>>> void Signature::SignHash(string Hash)
>>> {
>>> string Digest = Hash;
>>> string Signature = "";
>>>
>>> CryptoPP::RSASS<Cryptopp::PSS,CryptoPP::SHA1>::Signer
>>> signer(RSAprivate);
>>> cout << "cotrol point 1";
>>>
>>> CryptoPP::StringSource( Digest,true , new CryptoPP::SignerFilter (
>>> RNG , signer, new CryptoPP::StringSink ( Signature ) ) );
>>> cout << "control point 2";
>>> }
>>>
>>> If i launch the program it prints control point 1 and then it crashes
>>> in a Segmentation fault (bin/sh: line 1 3216 Segmentation fault
>>> /root/<directory>/debug/. /src/<project>) !!
>>> I'm a new user of C++ and Slackware and i don't know how to solve this
>>> problem ( I think that segmentation fault derives from a memory and/or a
>>> C++ contructor/destructor problem....... )
>>>
>>> Anyone can help me to solve this fault?
>>> --
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>>> To unsubscribe, send an email to
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>>>
>>>
>>>
>>> --
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>>
>>
>>
>>
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