I save and load the compressed version of EC keys in BaseEncoded form:
void Security::SavePublicKeyinFile (string pub){ //pub--> name of the file
to be saved
Base64Encoder pubkeysink(new FileSink(pub.c_str()));
publicKey.GetGroupParameters().GetCurve().EncodePoint(pubkeysink,publicKey.GetPublicElement(),true);
pubkeysink.MessageEnd(); // Need to flush Base64Encoders buffer
}
void Security::LoadPublicKeyfromFile (ECDSA<ECP, SHA1>::PublicKey
&SubjectPublicKey, char* pub){ //pub--> name of the file to be loaded
FileSource pubSrc(pub, true, new Base64Decoder);
ECP::Point pp;
SubjectPublicKey.AccessGroupParameters().Initialize(CryptoPP::ASN1::secp224r1());
SubjectPublicKey.GetGroupParameters().GetCurve().DecodePoint(pp,pubSrc,SubjectPublicKey.GetGroupParameters().GetCurve().EncodedPointSize(true));
SubjectPublicKey.SetPublicElement(pp);
}
/Amin
On Monday, September 19, 2011 12:19:53 AM UTC+2, Niij wrote:
>
> Hi,
>
> I'm in the same situation as you but with EC scheme, I used Harry's
> code (http://groups.google.com/group/cryptopp-users/browse_thread/
> thread/e58e46f0e8558f2b/022e858d15529859?lnk=gst&q=How+to+save+public
> +key+and+private+key+for+#022e858d15529859<http://groups.google.com/group/cryptopp-users/browse_thread/thread/e58e46f0e8558f2b/022e858d15529859?lnk=gst&q=How+to+save+public+key+and+private+key+for+#022e858d15529859>)
>
>
> to get the private and public key written on files and now I 'd like
> to Load the public key from the public.key file using the Load()
> method from PublicKey class
>
> Here is the portion of my code :
> CryptoPP::ECIES < ECC_ALGORITHM >::Encryptor Encryptor
> (publicKey);
>
> // Public Key Loading
>
> std::ifstream file2("Public.key", std::ios::in);
> string public_k;
> if(file2)
> {
> getline(file2, public_k); // put the first line on
> "public_k"
> cout << "the public key " << public_k << endl ; //
> display the line
> file2.close();
> }
> else
> cerr << "impossible to open the file!" << endl;
>
> publicKey.Load(public_k);
>
> -------------
>
> After compiling I got the following error :
> error: no matching function for call to
> ‘CryptoPP::DL_PublicKey_EC<CryptoPP::ECP>::Load(std::string&)’
> /usr/include/cryptopp/asn.h:240: note: candidates are: void
> CryptoPP::ASN1CryptoMaterial<BASE>::Load(CryptoPP::BufferedTransformation&)
>
> [with BASE = CryptoPP::PublicKey]
>
> The problem seems to be the choice of the parameter type for Load() ,
> which should be BufferedTransformation&. How can I convert from
> string to this type then ?
>
> thanks for help.
>
>
>
>
>
>
>
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