The cryptonote whitepaper says
First, the input is hashed using Keccak [KECCAK] with parameters b = 1600 and c = 512. [..]
That's nothing else as hashing the input with SHA3. The size of a SHA3 hash is 512 bit = 64 byte. The paper continues
[..] The bytes 64..191 are extracted from the Keccak final state and split into 8 blocks of 16 bytes each.
How can I extract the bytes from 64 to 191 when the size of the hash is only 64 byte?
Edit: Does Keccak final state refer to the internal state of the SHA3 algorithm and not to the output? If yes that leads to the question how can I get this value when I use a normal SHA3 hashing function that just returns the output. Or - oh my gosh - do I need to implement SHA3 by my own?