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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>>
>>
>>
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