Users of OldRandomPool must use the new interface. All that means is they must call IncorporateEntropy instead of Put, and GenerateBlock instead of Get
The existing interface still exists. The new interface is routed into the old methods. Without the new interface, using OldRandPool could result in:
$ ./cryptest.exe v
terminate called after throwing an instance of CryptoPP::NotImplemented
what(): RandomNumberGenerator: IncorporateEntropy not implemented
Aborted (core dumped)
RandomPool used to be a PGP-style deterministic generator and folks used it as a key generation function. At Crypto++ 5.5 the design changed to harden it agianst rollback attacks. The design change resulted in an upgrade barrier. That is, some folks are stuck at Crypto++ 4.2 or Crypto++ 5.2 because they must interoperate with existing software.
Below is the test program we used for the test vector. It was run against Crypto++ 5.4.
RandomPool prng;
SecByteBlock seed(0x00, 384), result(64);
prng.Put(seed, seed.size());
prng.GenerateBlock(result, result.size());
HexEncoder encoder(new FileSink(std::cout));
std::cout << "RandomPool: ";
encoder.Put(result, sizeof(result));
std::cout << std::endl;
