C++ (Cpp) RandomNumberGenerator::GetBlock示例

void OAEP<H,MGF,P,PLen>::Pad(RandomNumberGenerator &rng, const byte *input, unsigned int inputLength, byte *oaepBlock, unsigned int oaepBlockLen) const
{
	assert (inputLength <= MaxUnpaddedLength(oaepBlockLen));

	// convert from bit length to byte length
	if (oaepBlockLen % 8 != 0)
	{
		oaepBlock[0] = 0;
		oaepBlock++;
	}
	oaepBlockLen /= 8;

	const unsigned int hLen = H::DIGESTSIZE;
	const unsigned int seedLen = hLen, dbLen = oaepBlockLen-seedLen;
	byte *const maskedSeed = oaepBlock;
	byte *const maskedDB = oaepBlock+seedLen;

	// DB = pHash || 00 ... || 01 || M
	memcpy(maskedDB, PHash<H,P,PLen>(), hLen);
	memset(maskedDB+hLen, 0, dbLen-hLen-inputLength-1);
	maskedDB[dbLen-inputLength-1] = 0x01;
	memcpy(maskedDB+dbLen-inputLength, input, inputLength);

	rng.GetBlock(maskedSeed, seedLen);
	MGF::GenerateAndMask(maskedDB, dbLen, maskedSeed, seedLen);
	MGF::GenerateAndMask(maskedSeed, seedLen, maskedDB, dbLen);
}

示例#2

显示文件

文件： elgamal.cpp 项目： 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);
}