// 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::Encrypt
// Encrypts a block of data of the specified length using ElGamal encryption for this
// key. Returns allocated block/len of encrypted data.
EGPublicKey::CryptReturn
EGPublicKey::Encrypt(const void* theMsgP, unsigned long theLen) const
{
WTRACE("EGPublicKey::Encrypt");
// Sanity check
if ((! theMsgP) || (theLen == 0))
{
WDBG_LM("EGPublicKey::Encrypt No data to encrypt");
return CryptReturn(NULL,0);
}
try
{
// Allocate crypt object if needed
AllocateCrypt();
// Encrypt the data
ByteQueue aQueue;
EncryptData(aQueue, reinterpret_cast<const unsigned char*>(theMsgP), theLen);
// Build return
WDBG_LL("EGPublicKey::Encrypt Building return values.");
unsigned long anOutLen = aQueue.MaxRetrieveable();
if (anOutLen == 0)
{
WDBG_LM("EGPublicKey::Encrypt Encrypt failed, no data.");
return CryptReturn(NULL, 0);
}
auto_ptr<unsigned char> anOutP(new unsigned char [anOutLen]);
aQueue.Get(anOutP.get(), anOutLen);
WDBG_LM("EGPublicKey::Encrypt Encrypted, out block len=" << anOutLen);
return CryptReturn(anOutP.release(), anOutLen);
}
catch (Exception& anEx)
{
// Little trick here, construct a CryptException to auto log the failure!
WDBG_AH("EGPublicKey::Encrypt Caught CryptoLib exception: " << anEx.what());
#ifndef _WONCRYPT_NOEXCEPTIONS
WONCrypt::CryptException aLog(WONCommon::ExCryptoLib, __LINE__, __FILE__, anEx.what());
#endif
return CryptReturn(NULL,0);
}
}