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588 lines
18 KiB
C
588 lines
18 KiB
C
/* Based on the public domain implementation in
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* crypto_hash/keccakc512/simple/ from http://bench.cr.yp.to/supercop.html
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* by Ronny Van Keer
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* and the public domain "TweetFips202" implementation
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* from https://twitter.com/tweetfips202
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* by Gilles Van Assche, Daniel J. Bernstein, and Peter Schwabe */
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#include "fips202.h"
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#include <stddef.h>
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#include <stdint.h>
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#define NROUNDS 24
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#define ROL(a, offset) (((a) << (offset)) ^ ((a) >> (64 - (offset))))
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/*************************************************
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* Name: load64
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*
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* Description: Load 8 bytes into uint64_t in little-endian order
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*
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* Arguments: - const unsigned char *x: pointer to input byte array
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*
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* Returns the loaded 64-bit unsigned integer
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**************************************************/
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static uint64_t load64(const unsigned char *x) {
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unsigned int i;
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uint64_t r = 0;
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for (i = 0; i < 8; ++i) {
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r |= (uint64_t)x[i] << 8 * i;
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}
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return r;
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}
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/*************************************************
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* Name: store64
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*
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* Description: Store a 64-bit integer to a byte array in little-endian order
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*
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* Arguments: - uint8_t *x: pointer to the output byte array
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* - uint64_t u: input 64-bit unsigned integer
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**************************************************/
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static void store64(uint8_t *x, uint64_t u) {
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unsigned int i;
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for (i = 0; i < 8; ++i) {
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x[i] = u >> 8 * i;
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}
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}
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/* Keccak round constants */
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static const uint64_t KeccakF_RoundConstants[NROUNDS] = {
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(uint64_t)0x0000000000000001ULL, (uint64_t)0x0000000000008082ULL,
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(uint64_t)0x800000000000808aULL, (uint64_t)0x8000000080008000ULL,
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(uint64_t)0x000000000000808bULL, (uint64_t)0x0000000080000001ULL,
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(uint64_t)0x8000000080008081ULL, (uint64_t)0x8000000000008009ULL,
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(uint64_t)0x000000000000008aULL, (uint64_t)0x0000000000000088ULL,
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(uint64_t)0x0000000080008009ULL, (uint64_t)0x000000008000000aULL,
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(uint64_t)0x000000008000808bULL, (uint64_t)0x800000000000008bULL,
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(uint64_t)0x8000000000008089ULL, (uint64_t)0x8000000000008003ULL,
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(uint64_t)0x8000000000008002ULL, (uint64_t)0x8000000000000080ULL,
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(uint64_t)0x000000000000800aULL, (uint64_t)0x800000008000000aULL,
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(uint64_t)0x8000000080008081ULL, (uint64_t)0x8000000000008080ULL,
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(uint64_t)0x0000000080000001ULL, (uint64_t)0x8000000080008008ULL};
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/*************************************************
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* Name: KeccakF1600_StatePermute
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*
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* Description: The Keccak F1600 Permutation
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*
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* Arguments: - uint64_t *state: pointer to input/output Keccak state
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**************************************************/
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static void KeccakF1600_StatePermute(uint64_t *state) {
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int round;
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uint64_t Aba, Abe, Abi, Abo, Abu;
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uint64_t Aga, Age, Agi, Ago, Agu;
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uint64_t Aka, Ake, Aki, Ako, Aku;
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uint64_t Ama, Ame, Ami, Amo, Amu;
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uint64_t Asa, Ase, Asi, Aso, Asu;
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uint64_t BCa, BCe, BCi, BCo, BCu;
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uint64_t Da, De, Di, Do, Du;
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uint64_t Eba, Ebe, Ebi, Ebo, Ebu;
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uint64_t Ega, Ege, Egi, Ego, Egu;
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uint64_t Eka, Eke, Eki, Eko, Eku;
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uint64_t Ema, Eme, Emi, Emo, Emu;
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uint64_t Esa, Ese, Esi, Eso, Esu;
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// copyFromState(A, state)
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Aba = state[0];
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Abe = state[1];
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Abi = state[2];
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Abo = state[3];
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Abu = state[4];
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Aga = state[5];
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Age = state[6];
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Agi = state[7];
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Ago = state[8];
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Agu = state[9];
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Aka = state[10];
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Ake = state[11];
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Aki = state[12];
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Ako = state[13];
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Aku = state[14];
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Ama = state[15];
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Ame = state[16];
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Ami = state[17];
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Amo = state[18];
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Amu = state[19];
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Asa = state[20];
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Ase = state[21];
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Asi = state[22];
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Aso = state[23];
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Asu = state[24];
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for (round = 0; round < NROUNDS; round += 2) {
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// prepareTheta
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BCa = Aba ^ Aga ^ Aka ^ Ama ^ Asa;
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BCe = Abe ^ Age ^ Ake ^ Ame ^ Ase;
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BCi = Abi ^ Agi ^ Aki ^ Ami ^ Asi;
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BCo = Abo ^ Ago ^ Ako ^ Amo ^ Aso;
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BCu = Abu ^ Agu ^ Aku ^ Amu ^ Asu;
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// thetaRhoPiChiIotaPrepareTheta(round , A, E)
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Da = BCu ^ ROL(BCe, 1);
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De = BCa ^ ROL(BCi, 1);
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Di = BCe ^ ROL(BCo, 1);
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Do = BCi ^ ROL(BCu, 1);
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Du = BCo ^ ROL(BCa, 1);
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Aba ^= Da;
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BCa = Aba;
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Age ^= De;
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BCe = ROL(Age, 44);
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Aki ^= Di;
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BCi = ROL(Aki, 43);
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Amo ^= Do;
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BCo = ROL(Amo, 21);
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Asu ^= Du;
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BCu = ROL(Asu, 14);
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Eba = BCa ^ ((~BCe) & BCi);
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Eba ^= KeccakF_RoundConstants[round];
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Ebe = BCe ^ ((~BCi) & BCo);
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Ebi = BCi ^ ((~BCo) & BCu);
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Ebo = BCo ^ ((~BCu) & BCa);
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Ebu = BCu ^ ((~BCa) & BCe);
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Abo ^= Do;
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BCa = ROL(Abo, 28);
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Agu ^= Du;
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BCe = ROL(Agu, 20);
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Aka ^= Da;
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BCi = ROL(Aka, 3);
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Ame ^= De;
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BCo = ROL(Ame, 45);
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Asi ^= Di;
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BCu = ROL(Asi, 61);
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Ega = BCa ^ ((~BCe) & BCi);
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Ege = BCe ^ ((~BCi) & BCo);
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Egi = BCi ^ ((~BCo) & BCu);
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Ego = BCo ^ ((~BCu) & BCa);
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Egu = BCu ^ ((~BCa) & BCe);
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Abe ^= De;
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BCa = ROL(Abe, 1);
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Agi ^= Di;
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BCe = ROL(Agi, 6);
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Ako ^= Do;
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BCi = ROL(Ako, 25);
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Amu ^= Du;
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BCo = ROL(Amu, 8);
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Asa ^= Da;
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BCu = ROL(Asa, 18);
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Eka = BCa ^ ((~BCe) & BCi);
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Eke = BCe ^ ((~BCi) & BCo);
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Eki = BCi ^ ((~BCo) & BCu);
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Eko = BCo ^ ((~BCu) & BCa);
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Eku = BCu ^ ((~BCa) & BCe);
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Abu ^= Du;
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BCa = ROL(Abu, 27);
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Aga ^= Da;
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BCe = ROL(Aga, 36);
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Ake ^= De;
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BCi = ROL(Ake, 10);
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Ami ^= Di;
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BCo = ROL(Ami, 15);
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Aso ^= Do;
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BCu = ROL(Aso, 56);
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Ema = BCa ^ ((~BCe) & BCi);
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Eme = BCe ^ ((~BCi) & BCo);
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Emi = BCi ^ ((~BCo) & BCu);
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Emo = BCo ^ ((~BCu) & BCa);
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Emu = BCu ^ ((~BCa) & BCe);
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Abi ^= Di;
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BCa = ROL(Abi, 62);
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Ago ^= Do;
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BCe = ROL(Ago, 55);
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Aku ^= Du;
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BCi = ROL(Aku, 39);
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Ama ^= Da;
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BCo = ROL(Ama, 41);
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Ase ^= De;
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BCu = ROL(Ase, 2);
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Esa = BCa ^ ((~BCe) & BCi);
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Ese = BCe ^ ((~BCi) & BCo);
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Esi = BCi ^ ((~BCo) & BCu);
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Eso = BCo ^ ((~BCu) & BCa);
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Esu = BCu ^ ((~BCa) & BCe);
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// prepareTheta
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BCa = Eba ^ Ega ^ Eka ^ Ema ^ Esa;
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BCe = Ebe ^ Ege ^ Eke ^ Eme ^ Ese;
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BCi = Ebi ^ Egi ^ Eki ^ Emi ^ Esi;
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BCo = Ebo ^ Ego ^ Eko ^ Emo ^ Eso;
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BCu = Ebu ^ Egu ^ Eku ^ Emu ^ Esu;
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// thetaRhoPiChiIotaPrepareTheta(round+1, E, A)
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Da = BCu ^ ROL(BCe, 1);
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De = BCa ^ ROL(BCi, 1);
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Di = BCe ^ ROL(BCo, 1);
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Do = BCi ^ ROL(BCu, 1);
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Du = BCo ^ ROL(BCa, 1);
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Eba ^= Da;
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BCa = Eba;
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Ege ^= De;
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BCe = ROL(Ege, 44);
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Eki ^= Di;
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BCi = ROL(Eki, 43);
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Emo ^= Do;
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BCo = ROL(Emo, 21);
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Esu ^= Du;
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BCu = ROL(Esu, 14);
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Aba = BCa ^ ((~BCe) & BCi);
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Aba ^= KeccakF_RoundConstants[round + 1];
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Abe = BCe ^ ((~BCi) & BCo);
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Abi = BCi ^ ((~BCo) & BCu);
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Abo = BCo ^ ((~BCu) & BCa);
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Abu = BCu ^ ((~BCa) & BCe);
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Ebo ^= Do;
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BCa = ROL(Ebo, 28);
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Egu ^= Du;
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BCe = ROL(Egu, 20);
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Eka ^= Da;
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BCi = ROL(Eka, 3);
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Eme ^= De;
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BCo = ROL(Eme, 45);
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Esi ^= Di;
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BCu = ROL(Esi, 61);
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Aga = BCa ^ ((~BCe) & BCi);
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Age = BCe ^ ((~BCi) & BCo);
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Agi = BCi ^ ((~BCo) & BCu);
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Ago = BCo ^ ((~BCu) & BCa);
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Agu = BCu ^ ((~BCa) & BCe);
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Ebe ^= De;
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BCa = ROL(Ebe, 1);
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Egi ^= Di;
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BCe = ROL(Egi, 6);
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Eko ^= Do;
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BCi = ROL(Eko, 25);
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Emu ^= Du;
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BCo = ROL(Emu, 8);
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Esa ^= Da;
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BCu = ROL(Esa, 18);
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Aka = BCa ^ ((~BCe) & BCi);
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Ake = BCe ^ ((~BCi) & BCo);
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Aki = BCi ^ ((~BCo) & BCu);
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Ako = BCo ^ ((~BCu) & BCa);
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Aku = BCu ^ ((~BCa) & BCe);
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Ebu ^= Du;
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BCa = ROL(Ebu, 27);
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Ega ^= Da;
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BCe = ROL(Ega, 36);
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Eke ^= De;
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BCi = ROL(Eke, 10);
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Emi ^= Di;
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BCo = ROL(Emi, 15);
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Eso ^= Do;
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BCu = ROL(Eso, 56);
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Ama = BCa ^ ((~BCe) & BCi);
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Ame = BCe ^ ((~BCi) & BCo);
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Ami = BCi ^ ((~BCo) & BCu);
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Amo = BCo ^ ((~BCu) & BCa);
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Amu = BCu ^ ((~BCa) & BCe);
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Ebi ^= Di;
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BCa = ROL(Ebi, 62);
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Ego ^= Do;
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BCe = ROL(Ego, 55);
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Eku ^= Du;
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BCi = ROL(Eku, 39);
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Ema ^= Da;
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BCo = ROL(Ema, 41);
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Ese ^= De;
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BCu = ROL(Ese, 2);
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Asa = BCa ^ ((~BCe) & BCi);
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Ase = BCe ^ ((~BCi) & BCo);
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Asi = BCi ^ ((~BCo) & BCu);
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Aso = BCo ^ ((~BCu) & BCa);
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Asu = BCu ^ ((~BCa) & BCe);
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}
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// copyToState(state, A)
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state[0] = Aba;
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state[1] = Abe;
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state[2] = Abi;
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state[3] = Abo;
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state[4] = Abu;
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state[5] = Aga;
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state[6] = Age;
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state[7] = Agi;
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state[8] = Ago;
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state[9] = Agu;
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state[10] = Aka;
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state[11] = Ake;
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state[12] = Aki;
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state[13] = Ako;
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state[14] = Aku;
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state[15] = Ama;
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state[16] = Ame;
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state[17] = Ami;
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state[18] = Amo;
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state[19] = Amu;
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state[20] = Asa;
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state[21] = Ase;
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state[22] = Asi;
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state[23] = Aso;
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state[24] = Asu;
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}
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/*************************************************
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* Name: keccak_absorb
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*
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* Description: Absorb step of Keccak;
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* non-incremental, starts by zeroeing the state.
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*
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* Arguments: - uint64_t *s: pointer to (uninitialized) output Keccak state
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* - unsigned int r: rate in bytes (e.g., 168 for SHAKE128)
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* - const unsigned char *m: pointer to input to be absorbed into s
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* - unsigned long long mlen: length of input in bytes
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* - unsigned char p: domain-separation byte for different
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* Keccak-derived functions
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**************************************************/
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static void keccak_absorb(uint64_t *s, unsigned int r, const unsigned char *m,
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unsigned long long mlen, unsigned char p) {
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unsigned int i;
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unsigned char t[200];
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/* Zero state */
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for (i = 0; i < 25; ++i) {
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s[i] = 0;
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}
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while (mlen >= r) {
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for (i = 0; i < r / 8; ++i) {
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s[i] ^= load64(m + 8 * i);
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}
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KeccakF1600_StatePermute(s);
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mlen -= r;
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m += r;
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}
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for (i = 0; i < r; ++i) {
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t[i] = 0;
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}
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for (i = 0; i < mlen; ++i) {
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t[i] = m[i];
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}
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t[i] = p;
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t[r - 1] |= 128;
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for (i = 0; i < r / 8; ++i) {
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s[i] ^= load64(t + 8 * i);
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}
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}
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/*************************************************
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* Name: keccak_squeezeblocks
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*
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* Description: Squeeze step of Keccak. Squeezes full blocks of r bytes each.
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* Modifies the state. Can be called multiple times to keep
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* squeezing, i.e., is incremental.
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*
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* Arguments: - unsigned char *h: pointer to output blocks
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* - unsigned long long int nblocks: number of blocks to be
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* squeezed (written to h)
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* - uint64_t *s: pointer to input/output Keccak state
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* - unsigned int r: rate in bytes (e.g., 168 for SHAKE128)
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**************************************************/
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static void keccak_squeezeblocks(unsigned char *h, unsigned long nblocks,
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uint64_t *s, unsigned int r) {
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unsigned int i;
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while (nblocks > 0) {
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KeccakF1600_StatePermute(s);
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for (i = 0; i < (r >> 3); i++) {
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store64(h + 8 * i, s[i]);
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}
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h += r;
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nblocks--;
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}
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}
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/*************************************************
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* Name: shake128_absorb
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*
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* Description: Absorb step of the SHAKE128 XOF.
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* non-incremental, starts by zeroeing the state.
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*
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* Arguments: - uint64_t *s: pointer to (uninitialized) output Keccak state
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* - const unsigned char *input: pointer to input to be absorbed
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* into s
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* - unsigned long long inlen: length of input in bytes
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**************************************************/
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void shake128_absorb(uint64_t *s, const unsigned char *input,
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unsigned long long inlen) {
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keccak_absorb(s, SHAKE128_RATE, input, inlen, 0x1F);
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}
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/*************************************************
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* Name: shake128_squeezeblocks
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*
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* Description: Squeeze step of SHAKE128 XOF. Squeezes full blocks of
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* SHAKE128_RATE bytes each. Modifies the state. Can be called
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* multiple times to keep squeezing, i.e., is incremental.
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*
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* Arguments: - unsigned char *output: pointer to output blocks
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* - unsigned long long nblocks: number of blocks to be squeezed
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* (written to output)
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* - uint64_t *s: pointer to input/output Keccak state
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**************************************************/
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void shake128_squeezeblocks(unsigned char *output, unsigned long nblocks,
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uint64_t *s) {
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keccak_squeezeblocks(output, nblocks, s, SHAKE128_RATE);
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}
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/*************************************************
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* Name: shake256_absorb
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*
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* Description: Absorb step of the SHAKE256 XOF.
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* non-incremental, starts by zeroeing the state.
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*
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* Arguments: - uint64_t *s: pointer to (uninitialized) output Keccak state
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* - const unsigned char *input: pointer to input to be absorbed
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* into s
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* - unsigned long long inlen: length of input in bytes
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**************************************************/
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void shake256_absorb(uint64_t *s, const unsigned char *input,
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unsigned long long inlen) {
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keccak_absorb(s, SHAKE256_RATE, input, inlen, 0x1F);
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}
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/*************************************************
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* Name: shake256_squeezeblocks
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*
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* Description: Squeeze step of SHAKE256 XOF. Squeezes full blocks of
|
|
* SHAKE256_RATE bytes each. Modifies the state. Can be called
|
|
* multiple times to keep squeezing, i.e., is incremental.
|
|
*
|
|
* Arguments: - unsigned char *output: pointer to output blocks
|
|
* - unsigned long long nblocks: number of blocks to be squeezed
|
|
* (written to output)
|
|
* - uint64_t *s: pointer to input/output Keccak state
|
|
**************************************************/
|
|
void shake256_squeezeblocks(unsigned char *output, unsigned long nblocks,
|
|
uint64_t *s) {
|
|
keccak_squeezeblocks(output, nblocks, s, SHAKE256_RATE);
|
|
}
|
|
|
|
/*************************************************
|
|
* Name: shake128
|
|
*
|
|
* Description: SHAKE128 XOF with non-incremental API
|
|
*
|
|
* Arguments: - unsigned char *output: pointer to output
|
|
* - unsigned long long outlen: requested output length in bytes
|
|
* - const unsigned char *input: pointer to input
|
|
* - unsigned long long inlen: length of input in bytes
|
|
**************************************************/
|
|
void shake128(unsigned char *output, unsigned long long outlen,
|
|
const unsigned char *input, unsigned long long inlen) {
|
|
unsigned int i;
|
|
unsigned long nblocks = outlen / SHAKE128_RATE;
|
|
unsigned char t[SHAKE128_RATE];
|
|
uint64_t s[25];
|
|
|
|
shake128_absorb(s, input, inlen);
|
|
shake128_squeezeblocks(output, nblocks, s);
|
|
|
|
output += nblocks * SHAKE128_RATE;
|
|
outlen -= nblocks * SHAKE128_RATE;
|
|
|
|
if (outlen) {
|
|
shake128_squeezeblocks(t, 1, s);
|
|
for (i = 0; i < outlen; ++i) {
|
|
output[i] = t[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
/*************************************************
|
|
* Name: shake256
|
|
*
|
|
* Description: SHAKE256 XOF with non-incremental API
|
|
*
|
|
* Arguments: - unsigned char *output: pointer to output
|
|
* - unsigned long long outlen: requested output length in bytes
|
|
* - const unsigned char *input: pointer to input
|
|
* - unsigned long long inlen: length of input in bytes
|
|
**************************************************/
|
|
void shake256(unsigned char *output, unsigned long long outlen,
|
|
const unsigned char *input, unsigned long long inlen) {
|
|
unsigned int i;
|
|
unsigned long nblocks = outlen / SHAKE256_RATE;
|
|
unsigned char t[SHAKE256_RATE];
|
|
uint64_t s[25];
|
|
|
|
shake256_absorb(s, input, inlen);
|
|
shake256_squeezeblocks(output, nblocks, s);
|
|
|
|
output += nblocks * SHAKE256_RATE;
|
|
outlen -= nblocks * SHAKE256_RATE;
|
|
|
|
if (outlen) {
|
|
shake256_squeezeblocks(t, 1, s);
|
|
for (i = 0; i < outlen; ++i) {
|
|
output[i] = t[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
/*************************************************
|
|
* Name: sha3_256
|
|
*
|
|
* Description: SHA3-256 with non-incremental API
|
|
*
|
|
* Arguments: - unsigned char *output: pointer to output
|
|
* - const unsigned char *input: pointer to input
|
|
* - unsigned long long inlen: length of input in bytes
|
|
**************************************************/
|
|
void sha3_256(unsigned char *output, const unsigned char *input,
|
|
unsigned long long inlen) {
|
|
uint64_t s[25];
|
|
unsigned char t[SHA3_256_RATE];
|
|
size_t i;
|
|
|
|
/* Absorb input */
|
|
keccak_absorb(s, SHA3_256_RATE, input, inlen, 0x06);
|
|
|
|
/* Squeeze output */
|
|
keccak_squeezeblocks(t, 1, s, SHA3_256_RATE);
|
|
|
|
for (i = 0; i < 32; i++) {
|
|
output[i] = t[i];
|
|
}
|
|
}
|
|
|
|
/*************************************************
|
|
* Name: sha3_512
|
|
*
|
|
* Description: SHA3-512 with non-incremental API
|
|
*
|
|
* Arguments: - unsigned char *output: pointer to output
|
|
* - const unsigned char *input: pointer to input
|
|
* - unsigned long long inlen: length of input in bytes
|
|
**************************************************/
|
|
void sha3_512(unsigned char *output, const unsigned char *input,
|
|
unsigned long long inlen) {
|
|
uint64_t s[25];
|
|
unsigned char t[SHA3_512_RATE];
|
|
size_t i;
|
|
|
|
/* Absorb input */
|
|
keccak_absorb(s, SHA3_512_RATE, input, inlen, 0x06);
|
|
|
|
/* Squeeze output */
|
|
keccak_squeezeblocks(t, 1, s, SHA3_512_RATE);
|
|
|
|
for (i = 0; i < 64; i++) {
|
|
output[i] = t[i];
|
|
}
|
|
}
|