// EGPublicKey::CopyFromPrivateKey
// Copies public key from a private key. Existing key (if any) is replaced. This
// method takes the binary rep of the private key and drops the private portion
// to generate the public key.
void
EGPublicKey::CopyFromPrivateKey(const EGPrivateKey& theKeyR)
{
ClearLocal();
try
{
ByteQueue aPrivQueue;
aPrivQueue.Put(theKeyR.GetKey(), theKeyR.GetKeyLen());
aPrivQueue.Close();
ElGamalVerifier aKey(aPrivQueue);
ByteQueue aPubQueue;
aKey.DEREncode(aPubQueue);
aPubQueue.Close();
AllocKeyBuf(aPubQueue.MaxRetrieveable());
aPubQueue.Get(mKey, mKeyLen);
}
catch (Exception& anEx)
{
WDBG_AH("EGPublicKey::CopyFromPrivateKey Caught CryptoLib exception: " << anEx.what());
#ifndef _WONCRYPT_NOEXCEPTIONS
throw WONCrypt::CryptException(WONCommon::ExCryptoLib, __LINE__, __FILE__, anEx.what());
#else
Invalidate();
#endif
}
}
// EGPublicKey::Dump
// Streaming method. Outputs key to specfied stream. Outputs key length followed
// by each factor of the key.
void
EGPublicKey::Dump(std::ostream& os) const
{
// Output KeyLen followed by P, G, and Y
try
{
ByteQueue aQueue;
aQueue.Put(mKey, mKeyLen);
aQueue.Close();
Integer p, q, g, y;
BERSequenceDecoder aDecoder(aQueue);
p.BERDecode(aDecoder);
q.BERDecode(aDecoder);
g.BERDecode(aDecoder);
y.BERDecode(aDecoder);
os << "(Len=" << mKeyLen << " P=" << p << " Q=" << q << " G=" << g
<< " Y=" << y << ')';
}
catch (Exception& anEx)
{
WDBG_AH("EGPublicKey::Dump Caught CryptoLib exception: " << anEx.what());
os << "(EGPublicKey Exception: " << anEx.what() << ')';
}
}
// EGPublicKey::AllocateSig
// Allocates the mSigP member if needed. Feeds binary rep of key into the
// ElGamalVerifier class from Crypto++.
void
EGPublicKey::AllocateSig() const
{
WTRACE("EGPublicKey::AllocateSig");
if (! mSigP)
{
WDBG_LL("EGPublicKey::AllocateSig Allocating crypt object.");
ByteQueue aQueue;
aQueue.Put(mKey, mKeyLen);
aQueue.Close();
mSigP = new ElGamalVerifier(aQueue);
}
}
// EGPublicKey::AllocateCrypt
// Allocates the mCryptP member if needed. Manually decodes binary rep into factors
// and feeds appropriate factor to the ElGamalEncryptor class from Crypto++.
void
EGPublicKey::AllocateCrypt() const
{
WTRACE("EGPublicKey::AllocateCrypt");
if (! mCryptP)
{
WDBG_LL("EGPublicKey::AllocateCrypt Allocating crypt object.");
ByteQueue aQueue;
aQueue.Put(mKey, mKeyLen);
aQueue.Close();
// *HACK*
// Manually build the ElGamalEncryptor object. See notes at
// top of this file.
Integer p, q, g, y;
BERSequenceDecoder seq(aQueue);
p.BERDecode(seq);
q.BERDecode(seq);
g.BERDecode(seq);
y.BERDecode(seq);
mCryptP = new ElGamalEncryptor(p, g, y);
}
}
