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/*
* SHAKE-128 and SHAKE-256 as XOFs
*
* (C) 2016-2023 Jack Lloyd
* 2022-2023 Fabian Albert, Michael Boric, René Meusel - Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/shake_xof.h>
#include <botan/assert.h>
namespace Botan {
SHAKE_XOF::SHAKE_XOF(size_t capacity) : m_keccak(capacity, 0b1111, 4), m_output_generated(false) {
BOTAN_ASSERT_NOMSG(capacity == 256 || capacity == 512);
}
void SHAKE_XOF::reset() {
m_keccak.clear();
m_output_generated = false;
}
void SHAKE_XOF::add_data(std::span<const uint8_t> input) {
BOTAN_STATE_CHECK(!m_output_generated);
m_keccak.absorb(input);
}
void SHAKE_XOF::generate_bytes(std::span<uint8_t> output) {
if(!m_output_generated) {
m_output_generated = true;
m_keccak.finish();
}
m_keccak.squeeze(output);
}
} // namespace Botan