I am computing a SignatureValue from a couple of digests and my private key
and the resultant keystring is much shorter than I am expecting. The
returned keystring length is 128 but the string is only 20 chars:
My code that I am using is below. The argv is a vector containg two digest
values in Base64 format. The returned string from my method below I then
convert into a Base64 string before writing to the XML etc...
Can anyone please advise why I am getting a short signature value string?
CString CDigitalCerts::ComputeSignatureValue( vector<SDigestValue>&
vecBuffers )
{
unsigned char* pszSig;
unsigned int unLen = 0;
if ( !m_pKey )
{
ReadPKCS12();
}
if ( m_pKey )
{
EVP_MD_CTX ctx;
EVP_MD_CTX_init( &ctx );
int res = EVP_SignInit_ex( &ctx, EVP_sha1(), NULL );
int nSigSize = EVP_PKEY_size( m_pKey );
pszSig = new unsigned char[ nSigSize * 2 ];
// Feed buffers in to be signed:
size_t nCount = vecBuffers.size();
for ( int n = 0; n < nCount; ++n )
{
char* szBuffer = vecBuffers[n].sDigest.GetBuffer(0);
res = EVP_SignUpdate( &ctx, szBuffer, strlen(szBuffer)
);
}
// Compute signature:
res = EVP_SignFinal( &ctx, pszSig, &unLen, m_pKey );
if ( res != 0 )
{
// ???
}
}
pszSig[ unLen ] = '\0';
CString sSigVal( pszSig );
delete[] pszSig;
return sSigVal;
}
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