Hi,
I am new to cryptopp and have been struggling for a while with the creation
of private keys for ECDSA signing.
I have a private key in the format
"E4A6CFB431471CFCAE491FD566D19C87082CF9FA7722D7FA24B2B3F5669DBEFB". This is
stored as a string.
I want to use this to sign a text block using ECDSA. My code looks a bit
like this
string Sig::genSignature(const string& privKeyIn, const string& messageIn)
{
AutoSeededRandomPool prng;
ECDSA<ECP, SHA256>::PrivateKey privateKey;
privateKey.AccessGroupParameters().Initialize(ASN1::secp256r1());
privateKey.Load(StringSource(privKeyIn, true, NULL).Ref());
//privateKey.Save(privateKeyBQ);
//privateKey.SetPrivateExponent(CryptoPP::Integer("4127861661178866478914975717021461"));
ECDSA<ECP, SHA256>::Signer signer(privateKey);
// Determine maximum size, allocate a string with that size
size_t siglen = signer.MaxSignatureLength();
string signature(siglen, 0x00);
byte message[] = "test";
unsigned int messageLen = sizeof(message);
// Sign, and trim signature to actual size
siglen = signer.SignMessage(prng, (const byte *) messageIn.data(), (size_t)
messageIn.length(), (byte*)signature.data());
signature.resize(siglen);
cout << signature.data() << endl;
return signature;
}
This code generates the following error in Visual studio on the when I try
to do privateKey.load(...)
First-chance exception at 0x7693C42D in DLLTest.exe: Microsoft C++ exception
: CryptoPP::BERDecodeErr at memory location 0x0033EEA8.
Unhandled exception at 0x7693C42D in DLLTest.exe: Microsoft C++ exception:
CryptoPP::BERDecodeErr at memory location 0x0033EEA8.
I amg uessing I am doing somethign a bit stupid... any help would be
great???
PS I had a similar issue using ECDH for GMAC generation but ghot round this
by saving the key as a SECByteBlock but this 'trick' doesnt seem to work in
this case.
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