Hi all,
We are trying to sign a message with the ECDSA algorithm, for that we
want to use a key we have inside a file. We have already done the same
thing for the RSA_PKCS1 and the RSA_PSS algorithms and with these
both algorithms it works very well ! But with ECDSA it doesn’t work
and we don’t understand why. Actually, we always have a data abort at
run time…
You can find below the code for RSA_PKCS1 and RSA_PSS and also the
code we try to do to use ECDSA.
/////////////////////////////////////////////
// encryption: RSASSA_PKCS1_V1_5_SIGNATURE //
/////////////////////////////////////////////
if(hashIndex==SHA1_HASH &&
encryptIndex==RSASSA_PKCS1_V1_5_SIGNATURE)
{
CryptoPP::RandomPool randomPool;
CryptoPP::FileSource privFile(keyFileName.c_str(), true,
new CryptoPP::HexDecoder);
CryptoPP::RSASS<CryptoPP::PKCS1v15,
CryptoPP::SHA1>::Signer priv(privFile);
priv.SignMessage (randomPool, (const byte *)pMsgBuffer,
msgLength,(byte *) pCertificateBuffer);
}
//////////////////////////////////////
// encryption: RSASSA_PSS_SIGNATURE //
//////////////////////////////////////
if(hashIndex==SHA1_HASH && encryptIndex==RSASSA_PSS_SIGNATURE)
{
CryptoPP::RandomPool randomPool;
CryptoPP::FileSource privFile(keyFileName.c_str(), true,
new CryptoPP::HexDecoder);
CryptoPP::RSASS<CryptoPP::PSS, CryptoPP::SHA1>::Signer
priv(privFile);
priv.SignMessage (randomPool, (const byte *)pMsgBuffer,
msgLength,(byte *) pCertificateBuffer);
}
/////////////////////////////////
// encryption: ECDSA_SIGNATURE //
/////////////////////////////////
if(hashIndex==SHA1_HASH && encryptIndex==ECDSA_SIGNATURE)
{
CryptoPP::RandomPool randomPool;
CryptoPP::FileSource privFile(keyFileName.c_str(), true,
new CryptoPP::HexDecoder);
CryptoPP::ECDSA<ECP,SHA1>::Signer priv(privFile);
priv.SignMessage (randomPool, (const byte *)pMsgBuffer,
msgLength,(byte *) pCertificateBuffer);
}
We have also tried to find another way to use this algorithm: in using
this kind of code for example:
ECIES<ECP>::PrivateKey privateKey;
ByteQueue bq;
StringSource(base32encodedKey, true, new Base32Decoder(new
Redirector(bq)));
privateKey.Load(bq);
But it doesn’t work better because we don’t know how to use our own
key.
Can you help us? Can't we use the same method as for PSS/PKCS ?
We are working with the CryptoPP version 5.5.2 and Visual studio 2005.
Regards,
Julie
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