C++ (Cpp) MaxPlainTextLength Examples

Example #1

File: pubkey.cpp Project: AmesianX/encryption-library

void EncryptorTemplate<P,F>::Encrypt(RandomNumberGenerator &rng, const byte *plainText, unsigned int plainTextLength, byte *cipherText)
{
	assert(plainTextLength <= MaxPlainTextLength());

	SecByteBlock paddedBlock(PaddedBlockByteLength());
	pad.Pad(rng, plainText, plainTextLength, paddedBlock, PaddedBlockBitLength());
	f.ApplyFunction(Integer(paddedBlock, paddedBlock.size)).Encode(cipherText, CipherTextLength());
}

Example #2

File: elgamal.cpp Project: SOLARIC/world-opponent-network

unsigned int ElGamalDecryptor::Decrypt(const byte *cipherText, byte *plainText)
{
	Integer a(cipherText, modulusLen);
	Integer b(cipherText+modulusLen, modulusLen);
	Integer m;

	RawDecrypt(a, b, m);
	m.Encode(plainText, 1);
	unsigned int plainTextLength = plainText[0];
	if (plainTextLength > MaxPlainTextLength())
		return 0;
	m >>= 8;
	m.Encode(plainText, plainTextLength);
	return plainTextLength;
}

Example #3

File: elgamal.cpp Project: SOLARIC/world-opponent-network

void ElGamalEncryptor::Encrypt(RandomNumberGenerator &rng, const byte *plainText, unsigned int plainTextLength, byte *cipherText)
{
	assert(plainTextLength <= MaxPlainTextLength());

	SecByteBlock block(modulusLen-1);
	rng.GetBlock(block, modulusLen-2-plainTextLength);
	memcpy(block+modulusLen-2-plainTextLength, plainText, plainTextLength);
	block[modulusLen-2] = plainTextLength;

	Integer m(block, modulusLen-1);
	Integer a,b;
	RawEncrypt(Integer(rng, ExponentBitLength()), m, a, b);

	a.Encode(cipherText, modulusLen);
	b.Encode(cipherText+modulusLen, modulusLen);
}