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f4bd312180
* Integrate Kyber-AVX2 into PQClean * Fix types and formatting in Kyber * Workaround a valgrind crash * Remove comment in shuffle.s * Remove some extraneous truncations * fixup! Fix types and formatting in Kyber
64 lines
2.6 KiB
C
64 lines
2.6 KiB
C
#include "fips202.h"
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#include "symmetric.h"
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#include <stdlib.h>
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/*************************************************
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* Name: kyber_shake128_absorb
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*
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* Description: Absorb step of the SHAKE128 specialized for the Kyber context.
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* Arguments: - keccak_state *s: pointer to (uninitialized) output Keccak state
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* - const uint8_t *input: pointer to KYBER_SYMBYTES input to be absorbed into s
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* - uint8_t i additional byte of input
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* - uint8_t j additional byte of input
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_kyber_shake128_absorb(keccak_state *s, const uint8_t *input, uint8_t x, uint8_t y) {
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size_t i;
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uint8_t extseed[KYBER_SYMBYTES + 2];
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for (i = 0; i < KYBER_SYMBYTES; i++) {
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extseed[i] = input[i];
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}
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extseed[i++] = x;
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extseed[i] = y;
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shake128_absorb(s, extseed, KYBER_SYMBYTES + 2);
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}
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/*************************************************
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* Name: kyber_shake128_squeezeblocks
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*
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* Description: Squeeze step of SHAKE128 XOF. Squeezes full blocks of SHAKE128_RATE bytes each.
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* Modifies the state. Can be called multiple times to keep squeezing,
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* i.e., is incremental.
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*
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* Arguments: - uint8_t *output: pointer to output blocks
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* - unsigned long long nblocks: number of blocks to be squeezed (written to output)
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* - keccak_state *s: pointer to in/output Keccak state
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_kyber_shake128_squeezeblocks(uint8_t *output, size_t nblocks, keccak_state *s) {
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shake128_squeezeblocks(output, nblocks, s);
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}
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/*************************************************
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* Name: shake256_prf
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*
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* Description: Usage of SHAKE256 as a PRF, concatenates secret and public input
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* and then generates outlen bytes of SHAKE256 output
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*
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* Arguments: - uint8_t *output: pointer to output
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* - size_t outlen: number of requested output bytes
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* - const uint8_t * key: pointer to the key (of length KYBER_SYMBYTES)
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* - const uint8_t nonce: single-byte nonce (public PRF input)
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_shake256_prf(uint8_t *output, size_t outlen, const uint8_t *key, uint8_t nonce) {
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uint8_t extkey[KYBER_SYMBYTES + 1];
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size_t i;
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for (i = 0; i < KYBER_SYMBYTES; i++) {
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extkey[i] = key[i];
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}
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extkey[i] = nonce;
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shake256(output, outlen, extkey, KYBER_SYMBYTES + 1);
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}
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