Hi all,
I want to implement a sign scheme using Elliptic curves with following
code:
-----------------------------------------------------------------------------------------
class A {
public:
A();
~A();
string encryptSignFromHash(string &resultStr, ECIES<ECP>::PrivateKey
&privateKey);
private :
ECIES<ECP>::PrivateKey privateKey;
ECIES<ECP>::PublicKey publicKey;
AutoSeededRandomPool rng;
void initPublicKey(ECIES<ECP>::PrivateKey &privateKey);
};
string A::encryptSignFromHash(string &str,
ECIES<ECP>::PrivateKey
&privateKey) {
privateKey.Initialize(rng, ASN1::secp256r1()); //
<----------------------------------- pb here when two following lines
are in constructor !!
privateKey.MakePublicKey(publicKey);
// Signing a message
ECDSA<ECP>::Signer signer(privateKey);
string signature;
StringSink * stringSink = new StringSink(signature);
SignerFilter * signerFilter = new SignerFilter(rng, signer,
stringSink);
// encrypt message
StringSource(str, true, signerFilter);
// ...
}
-----------------------------------------------------------------------------------------
Doing so, I get a new private/public key each time I sign a document
but that is not what I want !
Of course, I tried to put the two following lines in the constructor
of A():
-----------------------------------------------------------------------------------------
privateKey.Initialize(rng, ASN1::secp256r1());
privateKey.MakePublicKey(publicKey);
-----------------------------------------------------------------------------------------
... but it did not work, and I got this error message:
-----------------------------------------------------------------------------------------
" terminate called after throwing an instance of
'CryptoPP::CryptoMaterial::InvalidMaterial'
what(): CryptoMaterial: this object contains invalid values "
-----------------------------------------------------------------------------------------
What is the reason?
How can I make it so that I create and init a private/public key pair
only once for all before signing several documents?
Thank you very much for your help
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