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pqc/crypto_sign/dilithium2/clean/poly.c
John M. Schanck 52750b86b1 Pull Dilithium changes from upstream
2021-02-09 10:43:16 -05:00

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#include "ntt.h"
#include "params.h"
#include "poly.h"
#include "reduce.h"
#include "rounding.h"
#include "symmetric.h"
#include <stdint.h>
#define DBENCH_START()
#define DBENCH_STOP(t)
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_reduce
*
* Description: Inplace reduction of all coefficients of polynomial to
* representative in [-6283009,6283007].
*
* Arguments: - poly *a: pointer to input/output polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_reduce(poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
a->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_reduce32(a->coeffs[i]);
}
DBENCH_STOP(*tred);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_caddq
*
* Description: For all coefficients of in/out polynomial add Q if
* coefficient is negative.
*
* Arguments: - poly *a: pointer to input/output polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_caddq(poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
a->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_caddq(a->coeffs[i]);
}
DBENCH_STOP(*tred);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_freeze
*
* Description: Inplace reduction of all coefficients of polynomial to
* standard representatives.
*
* Arguments: - poly *a: pointer to input/output polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_freeze(poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
a->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_freeze(a->coeffs[i]);
}
DBENCH_STOP(*tred);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_add
*
* Description: Add polynomials. No modular reduction is performed.
*
* Arguments: - poly *c: pointer to output polynomial
* - const poly *a: pointer to first summand
* - const poly *b: pointer to second summand
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_add(poly *c, const poly *a, const poly *b) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
c->coeffs[i] = a->coeffs[i] + b->coeffs[i];
}
DBENCH_STOP(*tadd);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_sub
*
* Description: Subtract polynomials. No modular reduction is
* performed.
*
* Arguments: - poly *c: pointer to output polynomial
* - const poly *a: pointer to first input polynomial
* - const poly *b: pointer to second input polynomial to be
* subtraced from first input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_sub(poly *c, const poly *a, const poly *b) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
c->coeffs[i] = a->coeffs[i] - b->coeffs[i];
}
DBENCH_STOP(*tadd);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_shiftl
*
* Description: Multiply polynomial by 2^D without modular reduction. Assumes
* input coefficients to be less than 2^{31-D} in absolute value.
*
* Arguments: - poly *a: pointer to input/output polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_shiftl(poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
a->coeffs[i] <<= D;
}
DBENCH_STOP(*tmul);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_ntt
*
* Description: Inplace forward NTT. Coefficients can grow by
* 8*Q in absolute value.
*
* Arguments: - poly *a: pointer to input/output polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_ntt(poly *a) {
DBENCH_START();
PQCLEAN_DILITHIUM2_CLEAN_ntt(a->coeffs);
DBENCH_STOP(*tmul);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_invntt_tomont
*
* Description: Inplace inverse NTT and multiplication by 2^{32}.
* Input coefficients need to be less than Q in absolute
* value and output coefficients are again bounded by Q.
*
* Arguments: - poly *a: pointer to input/output polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_invntt_tomont(poly *a) {
DBENCH_START();
PQCLEAN_DILITHIUM2_CLEAN_invntt_tomont(a->coeffs);
DBENCH_STOP(*tmul);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_pointwise_montgomery
*
* Description: Pointwise multiplication of polynomials in NTT domain
* representation and multiplication of resulting polynomial
* by 2^{-32}.
*
* Arguments: - poly *c: pointer to output polynomial
* - const poly *a: pointer to first input polynomial
* - const poly *b: pointer to second input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_pointwise_montgomery(poly *c, const poly *a, const poly *b) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
c->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_montgomery_reduce((int64_t)a->coeffs[i] * b->coeffs[i]);
}
DBENCH_STOP(*tmul);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_power2round
*
* Description: For all coefficients c of the input polynomial,
* compute c0, c1 such that c mod Q = c1*2^D + c0
* with -2^{D-1} < c0 <= 2^{D-1}. Assumes coefficients to be
* standard representatives.
*
* Arguments: - poly *a1: pointer to output polynomial with coefficients c1
* - poly *a0: pointer to output polynomial with coefficients c0
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_power2round(poly *a1, poly *a0, const poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
a1->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_power2round(&a0->coeffs[i], a->coeffs[i]);
}
DBENCH_STOP(*tround);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_decompose
*
* Description: For all coefficients c of the input polynomial,
* compute high and low bits c0, c1 such c mod Q = c1*ALPHA + c0
* with -ALPHA/2 < c0 <= ALPHA/2 except c1 = (Q-1)/ALPHA where we
* set c1 = 0 and -ALPHA/2 <= c0 = c mod Q - Q < 0.
* Assumes coefficients to be standard representatives.
*
* Arguments: - poly *a1: pointer to output polynomial with coefficients c1
* - poly *a0: pointer to output polynomial with coefficients c0
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_decompose(poly *a1, poly *a0, const poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
a1->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_decompose(&a0->coeffs[i], a->coeffs[i]);
}
DBENCH_STOP(*tround);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_make_hint
*
* Description: Compute hint polynomial. The coefficients of which indicate
* whether the low bits of the corresponding coefficient of
* the input polynomial overflow into the high bits.
*
* Arguments: - poly *h: pointer to output hint polynomial
* - const poly *a0: pointer to low part of input polynomial
* - const poly *a1: pointer to high part of input polynomial
*
* Returns number of 1 bits.
**************************************************/
unsigned int PQCLEAN_DILITHIUM2_CLEAN_poly_make_hint(poly *h, const poly *a0, const poly *a1) {
unsigned int i, s = 0;
DBENCH_START();
for (i = 0; i < N; ++i) {
h->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_make_hint(a0->coeffs[i], a1->coeffs[i]);
s += h->coeffs[i];
}
DBENCH_STOP(*tround);
return s;
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_use_hint
*
* Description: Use hint polynomial to correct the high bits of a polynomial.
*
* Arguments: - poly *b: pointer to output polynomial with corrected high bits
* - const poly *a: pointer to input polynomial
* - const poly *h: pointer to input hint polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_use_hint(poly *b, const poly *a, const poly *h) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N; ++i) {
b->coeffs[i] = PQCLEAN_DILITHIUM2_CLEAN_use_hint(a->coeffs[i], h->coeffs[i]);
}
DBENCH_STOP(*tround);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_chknorm
*
* Description: Check infinity norm of polynomial against given bound.
* Assumes input coefficients were reduced by PQCLEAN_DILITHIUM2_CLEAN_reduce32().
*
* Arguments: - const poly *a: pointer to polynomial
* - int32_t B: norm bound
*
* Returns 0 if norm is strictly smaller than B <= (Q-1)/8 and 1 otherwise.
**************************************************/
int PQCLEAN_DILITHIUM2_CLEAN_poly_chknorm(const poly *a, int32_t B) {
unsigned int i;
int32_t t;
DBENCH_START();
if (B > (Q - 1) / 8) {
return 1;
}
/* It is ok to leak which coefficient violates the bound since
the probability for each coefficient is independent of secret
data but we must not leak the sign of the centralized representative. */
for (i = 0; i < N; ++i) {
/* Absolute value */
t = a->coeffs[i] >> 31;
t = a->coeffs[i] - (t & 2 * a->coeffs[i]);
if (t >= B) {
DBENCH_STOP(*tsample);
return 1;
}
}
DBENCH_STOP(*tsample);
return 0;
}
/*************************************************
* Name: rej_uniform
*
* Description: Sample uniformly random coefficients in [0, Q-1] by
* performing rejection sampling on array of random bytes.
*
* Arguments: - int32_t *a: pointer to output array (allocated)
* - unsigned int len: number of coefficients to be sampled
* - const uint8_t *buf: array of random bytes
* - unsigned int buflen: length of array of random bytes
*
* Returns number of sampled coefficients. Can be smaller than len if not enough
* random bytes were given.
**************************************************/
static unsigned int rej_uniform(int32_t *a,
unsigned int len,
const uint8_t *buf,
unsigned int buflen) {
unsigned int ctr, pos;
uint32_t t;
DBENCH_START();
ctr = pos = 0;
while (ctr < len && pos + 3 <= buflen) {
t = buf[pos++];
t |= (uint32_t)buf[pos++] << 8;
t |= (uint32_t)buf[pos++] << 16;
t &= 0x7FFFFF;
if (t < Q) {
a[ctr++] = t;
}
}
DBENCH_STOP(*tsample);
return ctr;
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_uniform
*
* Description: Sample polynomial with uniformly random coefficients
* in [0,Q-1] by performing rejection sampling on the
* output stream of SHAKE256(seed|nonce) or AES256CTR(seed,nonce).
*
* Arguments: - poly *a: pointer to output polynomial
* - const uint8_t seed[]: byte array with seed of length SEEDBYTES
* - uint16_t nonce: 2-byte nonce
**************************************************/
#define POLY_UNIFORM_NBLOCKS ((768 + STREAM128_BLOCKBYTES - 1)/STREAM128_BLOCKBYTES)
void PQCLEAN_DILITHIUM2_CLEAN_poly_uniform(poly *a,
const uint8_t seed[SEEDBYTES],
uint16_t nonce) {
unsigned int i, ctr, off;
unsigned int buflen = POLY_UNIFORM_NBLOCKS * STREAM128_BLOCKBYTES;
uint8_t buf[POLY_UNIFORM_NBLOCKS * STREAM128_BLOCKBYTES + 2];
stream128_state state;
stream128_init(&state, seed, nonce);
stream128_squeezeblocks(buf, POLY_UNIFORM_NBLOCKS, &state);
ctr = rej_uniform(a->coeffs, N, buf, buflen);
while (ctr < N) {
off = buflen % 3;
for (i = 0; i < off; ++i) {
buf[i] = buf[buflen - off + i];
}
stream128_squeezeblocks(buf + off, 1, &state);
buflen = STREAM128_BLOCKBYTES + off;
ctr += rej_uniform(a->coeffs + ctr, N - ctr, buf, buflen);
}
stream128_release(&state);
}
/*************************************************
* Name: rej_eta
*
* Description: Sample uniformly random coefficients in [-ETA, ETA] by
* performing rejection sampling on array of random bytes.
*
* Arguments: - int32_t *a: pointer to output array (allocated)
* - unsigned int len: number of coefficients to be sampled
* - const uint8_t *buf: array of random bytes
* - unsigned int buflen: length of array of random bytes
*
* Returns number of sampled coefficients. Can be smaller than len if not enough
* random bytes were given.
**************************************************/
static unsigned int rej_eta(int32_t *a,
unsigned int len,
const uint8_t *buf,
unsigned int buflen) {
unsigned int ctr, pos;
uint32_t t0, t1;
DBENCH_START();
ctr = pos = 0;
while (ctr < len && pos < buflen) {
t0 = buf[pos] & 0x0F;
t1 = buf[pos++] >> 4;
if (t0 < 15) {
t0 = t0 - (205 * t0 >> 10) * 5;
a[ctr++] = 2 - t0;
}
if (t1 < 15 && ctr < len) {
t1 = t1 - (205 * t1 >> 10) * 5;
a[ctr++] = 2 - t1;
}
}
DBENCH_STOP(*tsample);
return ctr;
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_poly_uniform_eta
*
* Description: Sample polynomial with uniformly random coefficients
* in [-ETA,ETA] by performing rejection sampling on the
* output stream from SHAKE256(seed|nonce) or AES256CTR(seed,nonce).
*
* Arguments: - poly *a: pointer to output polynomial
* - const uint8_t seed[]: byte array with seed of length CRHBYTES
* - uint16_t nonce: 2-byte nonce
**************************************************/
#define POLY_UNIFORM_ETA_NBLOCKS ((136 + STREAM256_BLOCKBYTES - 1)/STREAM256_BLOCKBYTES)
void PQCLEAN_DILITHIUM2_CLEAN_poly_uniform_eta(poly *a,
const uint8_t seed[CRHBYTES],
uint16_t nonce) {
unsigned int ctr;
unsigned int buflen = POLY_UNIFORM_ETA_NBLOCKS * STREAM256_BLOCKBYTES;
uint8_t buf[POLY_UNIFORM_ETA_NBLOCKS * STREAM256_BLOCKBYTES];
stream256_state state;
stream256_init(&state, seed, nonce);
stream256_squeezeblocks(buf, POLY_UNIFORM_ETA_NBLOCKS, &state);
ctr = rej_eta(a->coeffs, N, buf, buflen);
while (ctr < N) {
stream256_squeezeblocks(buf, 1, &state);
ctr += rej_eta(a->coeffs + ctr, N - ctr, buf, STREAM256_BLOCKBYTES);
}
stream256_release(&state);
}
/*************************************************
* Name: poly_uniform_gamma1m1
*
* Description: Sample polynomial with uniformly random coefficients
* in [-(GAMMA1 - 1), GAMMA1] by unpacking output stream
* of SHAKE256(seed|nonce) or AES256CTR(seed,nonce).
*
* Arguments: - poly *a: pointer to output polynomial
* - const uint8_t seed[]: byte array with seed of length CRHBYTES
* - uint16_t nonce: 16-bit nonce
**************************************************/
#define POLY_UNIFORM_GAMMA1_NBLOCKS ((POLYZ_PACKEDBYTES + STREAM256_BLOCKBYTES - 1)/STREAM256_BLOCKBYTES)
void PQCLEAN_DILITHIUM2_CLEAN_poly_uniform_gamma1(poly *a,
const uint8_t seed[CRHBYTES],
uint16_t nonce) {
uint8_t buf[POLY_UNIFORM_GAMMA1_NBLOCKS * STREAM256_BLOCKBYTES];
stream256_state state;
stream256_init(&state, seed, nonce);
stream256_squeezeblocks(buf, POLY_UNIFORM_GAMMA1_NBLOCKS, &state);
stream256_release(&state);
PQCLEAN_DILITHIUM2_CLEAN_polyz_unpack(a, buf);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_challenge
*
* Description: Implementation of H. Samples polynomial with TAU nonzero
* coefficients in {-1,1} using the output stream of
* SHAKE256(seed).
*
* Arguments: - poly *c: pointer to output polynomial
* - const uint8_t mu[]: byte array containing seed of length SEEDBYTES
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_poly_challenge(poly *c, const uint8_t seed[SEEDBYTES]) {
unsigned int i, b, pos;
uint64_t signs;
uint8_t buf[SHAKE256_RATE];
shake256incctx state;
shake256_inc_init(&state);
shake256_inc_absorb(&state, seed, SEEDBYTES);
shake256_inc_finalize(&state);
shake256_inc_squeeze(buf, sizeof buf, &state);
signs = 0;
for (i = 0; i < 8; ++i) {
signs |= (uint64_t)buf[i] << 8 * i;
}
pos = 8;
for (i = 0; i < N; ++i) {
c->coeffs[i] = 0;
}
for (i = N - TAU; i < N; ++i) {
do {
if (pos >= SHAKE256_RATE) {
shake256_inc_squeeze(buf, sizeof buf, &state);
pos = 0;
}
b = buf[pos++];
} while (b > i);
c->coeffs[i] = c->coeffs[b];
c->coeffs[b] = 1 - 2 * (signs & 1);
signs >>= 1;
}
shake256_inc_ctx_release(&state);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyeta_pack
*
* Description: Bit-pack polynomial with coefficients in [-ETA,ETA].
*
* Arguments: - uint8_t *r: pointer to output byte array with at least
* POLYETA_PACKEDBYTES bytes
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyeta_pack(uint8_t *r, const poly *a) {
unsigned int i;
uint8_t t[8];
DBENCH_START();
for (i = 0; i < N / 8; ++i) {
t[0] = (uint8_t) (ETA - a->coeffs[8 * i + 0]);
t[1] = (uint8_t) (ETA - a->coeffs[8 * i + 1]);
t[2] = (uint8_t) (ETA - a->coeffs[8 * i + 2]);
t[3] = (uint8_t) (ETA - a->coeffs[8 * i + 3]);
t[4] = (uint8_t) (ETA - a->coeffs[8 * i + 4]);
t[5] = (uint8_t) (ETA - a->coeffs[8 * i + 5]);
t[6] = (uint8_t) (ETA - a->coeffs[8 * i + 6]);
t[7] = (uint8_t) (ETA - a->coeffs[8 * i + 7]);
r[3 * i + 0] = (t[0] >> 0) | (t[1] << 3) | (t[2] << 6);
r[3 * i + 1] = (t[2] >> 2) | (t[3] << 1) | (t[4] << 4) | (t[5] << 7);
r[3 * i + 2] = (t[5] >> 1) | (t[6] << 2) | (t[7] << 5);
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyeta_unpack
*
* Description: Unpack polynomial with coefficients in [-ETA,ETA].
*
* Arguments: - poly *r: pointer to output polynomial
* - const uint8_t *a: byte array with bit-packed polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyeta_unpack(poly *r, const uint8_t *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N / 8; ++i) {
r->coeffs[8 * i + 0] = (a[3 * i + 0] >> 0) & 7;
r->coeffs[8 * i + 1] = (a[3 * i + 0] >> 3) & 7;
r->coeffs[8 * i + 2] = ((a[3 * i + 0] >> 6) | (a[3 * i + 1] << 2)) & 7;
r->coeffs[8 * i + 3] = (a[3 * i + 1] >> 1) & 7;
r->coeffs[8 * i + 4] = (a[3 * i + 1] >> 4) & 7;
r->coeffs[8 * i + 5] = ((a[3 * i + 1] >> 7) | (a[3 * i + 2] << 1)) & 7;
r->coeffs[8 * i + 6] = (a[3 * i + 2] >> 2) & 7;
r->coeffs[8 * i + 7] = (a[3 * i + 2] >> 5) & 7;
r->coeffs[8 * i + 0] = ETA - r->coeffs[8 * i + 0];
r->coeffs[8 * i + 1] = ETA - r->coeffs[8 * i + 1];
r->coeffs[8 * i + 2] = ETA - r->coeffs[8 * i + 2];
r->coeffs[8 * i + 3] = ETA - r->coeffs[8 * i + 3];
r->coeffs[8 * i + 4] = ETA - r->coeffs[8 * i + 4];
r->coeffs[8 * i + 5] = ETA - r->coeffs[8 * i + 5];
r->coeffs[8 * i + 6] = ETA - r->coeffs[8 * i + 6];
r->coeffs[8 * i + 7] = ETA - r->coeffs[8 * i + 7];
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyt1_pack
*
* Description: Bit-pack polynomial t1 with coefficients fitting in 10 bits.
* Input coefficients are assumed to be standard representatives.
*
* Arguments: - uint8_t *r: pointer to output byte array with at least
* POLYT1_PACKEDBYTES bytes
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyt1_pack(uint8_t *r, const poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N / 4; ++i) {
r[5 * i + 0] = (uint8_t) (a->coeffs[4 * i + 0] >> 0);
r[5 * i + 1] = (uint8_t) ((a->coeffs[4 * i + 0] >> 8) | (a->coeffs[4 * i + 1] << 2));
r[5 * i + 2] = (uint8_t) ((a->coeffs[4 * i + 1] >> 6) | (a->coeffs[4 * i + 2] << 4));
r[5 * i + 3] = (uint8_t) ((a->coeffs[4 * i + 2] >> 4) | (a->coeffs[4 * i + 3] << 6));
r[5 * i + 4] = (uint8_t) (a->coeffs[4 * i + 3] >> 2);
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyt1_unpack
*
* Description: Unpack polynomial t1 with 10-bit coefficients.
* Output coefficients are standard representatives.
*
* Arguments: - poly *r: pointer to output polynomial
* - const uint8_t *a: byte array with bit-packed polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyt1_unpack(poly *r, const uint8_t *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N / 4; ++i) {
r->coeffs[4 * i + 0] = ((a[5 * i + 0] >> 0) | ((uint32_t)a[5 * i + 1] << 8)) & 0x3FF;
r->coeffs[4 * i + 1] = ((a[5 * i + 1] >> 2) | ((uint32_t)a[5 * i + 2] << 6)) & 0x3FF;
r->coeffs[4 * i + 2] = ((a[5 * i + 2] >> 4) | ((uint32_t)a[5 * i + 3] << 4)) & 0x3FF;
r->coeffs[4 * i + 3] = ((a[5 * i + 3] >> 6) | ((uint32_t)a[5 * i + 4] << 2)) & 0x3FF;
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyt0_pack
*
* Description: Bit-pack polynomial t0 with coefficients in ]-2^{D-1}, 2^{D-1}].
*
* Arguments: - uint8_t *r: pointer to output byte array with at least
* POLYT0_PACKEDBYTES bytes
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyt0_pack(uint8_t *r, const poly *a) {
unsigned int i;
uint32_t t[8];
DBENCH_START();
for (i = 0; i < N / 8; ++i) {
t[0] = (1 << (D - 1)) - a->coeffs[8 * i + 0];
t[1] = (1 << (D - 1)) - a->coeffs[8 * i + 1];
t[2] = (1 << (D - 1)) - a->coeffs[8 * i + 2];
t[3] = (1 << (D - 1)) - a->coeffs[8 * i + 3];
t[4] = (1 << (D - 1)) - a->coeffs[8 * i + 4];
t[5] = (1 << (D - 1)) - a->coeffs[8 * i + 5];
t[6] = (1 << (D - 1)) - a->coeffs[8 * i + 6];
t[7] = (1 << (D - 1)) - a->coeffs[8 * i + 7];
r[13 * i + 0] = (uint8_t) t[0];
r[13 * i + 1] = (uint8_t) (t[0] >> 8);
r[13 * i + 1] |= (uint8_t) (t[1] << 5);
r[13 * i + 2] = (uint8_t) (t[1] >> 3);
r[13 * i + 3] = (uint8_t) (t[1] >> 11);
r[13 * i + 3] |= (uint8_t) (t[2] << 2);
r[13 * i + 4] = (uint8_t) (t[2] >> 6);
r[13 * i + 4] |= (uint8_t) (t[3] << 7);
r[13 * i + 5] = (uint8_t) (t[3] >> 1);
r[13 * i + 6] = (uint8_t) (t[3] >> 9);
r[13 * i + 6] |= (uint8_t) (t[4] << 4);
r[13 * i + 7] = (uint8_t) (t[4] >> 4);
r[13 * i + 8] = (uint8_t) (t[4] >> 12);
r[13 * i + 8] |= (uint8_t) (t[5] << 1);
r[13 * i + 9] = (uint8_t) (t[5] >> 7);
r[13 * i + 9] |= (uint8_t) (t[6] << 6);
r[13 * i + 10] = (uint8_t) (t[6] >> 2);
r[13 * i + 11] = (uint8_t) (t[6] >> 10);
r[13 * i + 11] |= (uint8_t) (t[7] << 3);
r[13 * i + 12] = (uint8_t) (t[7] >> 5);
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyt0_unpack
*
* Description: Unpack polynomial t0 with coefficients in ]-2^{D-1}, 2^{D-1}].
*
* Arguments: - poly *r: pointer to output polynomial
* - const uint8_t *a: byte array with bit-packed polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyt0_unpack(poly *r, const uint8_t *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N / 8; ++i) {
r->coeffs[8 * i + 0] = a[13 * i + 0];
r->coeffs[8 * i + 0] |= (uint32_t)a[13 * i + 1] << 8;
r->coeffs[8 * i + 0] &= 0x1FFF;
r->coeffs[8 * i + 1] = a[13 * i + 1] >> 5;
r->coeffs[8 * i + 1] |= (uint32_t)a[13 * i + 2] << 3;
r->coeffs[8 * i + 1] |= (uint32_t)a[13 * i + 3] << 11;
r->coeffs[8 * i + 1] &= 0x1FFF;
r->coeffs[8 * i + 2] = a[13 * i + 3] >> 2;
r->coeffs[8 * i + 2] |= (uint32_t)a[13 * i + 4] << 6;
r->coeffs[8 * i + 2] &= 0x1FFF;
r->coeffs[8 * i + 3] = a[13 * i + 4] >> 7;
r->coeffs[8 * i + 3] |= (uint32_t)a[13 * i + 5] << 1;
r->coeffs[8 * i + 3] |= (uint32_t)a[13 * i + 6] << 9;
r->coeffs[8 * i + 3] &= 0x1FFF;
r->coeffs[8 * i + 4] = a[13 * i + 6] >> 4;
r->coeffs[8 * i + 4] |= (uint32_t)a[13 * i + 7] << 4;
r->coeffs[8 * i + 4] |= (uint32_t)a[13 * i + 8] << 12;
r->coeffs[8 * i + 4] &= 0x1FFF;
r->coeffs[8 * i + 5] = a[13 * i + 8] >> 1;
r->coeffs[8 * i + 5] |= (uint32_t)a[13 * i + 9] << 7;
r->coeffs[8 * i + 5] &= 0x1FFF;
r->coeffs[8 * i + 6] = a[13 * i + 9] >> 6;
r->coeffs[8 * i + 6] |= (uint32_t)a[13 * i + 10] << 2;
r->coeffs[8 * i + 6] |= (uint32_t)a[13 * i + 11] << 10;
r->coeffs[8 * i + 6] &= 0x1FFF;
r->coeffs[8 * i + 7] = a[13 * i + 11] >> 3;
r->coeffs[8 * i + 7] |= (uint32_t)a[13 * i + 12] << 5;
r->coeffs[8 * i + 7] &= 0x1FFF;
r->coeffs[8 * i + 0] = (1 << (D - 1)) - r->coeffs[8 * i + 0];
r->coeffs[8 * i + 1] = (1 << (D - 1)) - r->coeffs[8 * i + 1];
r->coeffs[8 * i + 2] = (1 << (D - 1)) - r->coeffs[8 * i + 2];
r->coeffs[8 * i + 3] = (1 << (D - 1)) - r->coeffs[8 * i + 3];
r->coeffs[8 * i + 4] = (1 << (D - 1)) - r->coeffs[8 * i + 4];
r->coeffs[8 * i + 5] = (1 << (D - 1)) - r->coeffs[8 * i + 5];
r->coeffs[8 * i + 6] = (1 << (D - 1)) - r->coeffs[8 * i + 6];
r->coeffs[8 * i + 7] = (1 << (D - 1)) - r->coeffs[8 * i + 7];
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyz_pack
*
* Description: Bit-pack polynomial with coefficients
* in [-(GAMMA1 - 1), GAMMA1].
*
* Arguments: - uint8_t *r: pointer to output byte array with at least
* POLYZ_PACKEDBYTES bytes
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyz_pack(uint8_t *r, const poly *a) {
unsigned int i;
uint32_t t[4];
DBENCH_START();
for (i = 0; i < N / 4; ++i) {
t[0] = GAMMA1 - a->coeffs[4 * i + 0];
t[1] = GAMMA1 - a->coeffs[4 * i + 1];
t[2] = GAMMA1 - a->coeffs[4 * i + 2];
t[3] = GAMMA1 - a->coeffs[4 * i + 3];
r[9 * i + 0] = (uint8_t) t[0];
r[9 * i + 1] = (uint8_t) (t[0] >> 8);
r[9 * i + 2] = (uint8_t) (t[0] >> 16);
r[9 * i + 2] |= (uint8_t) (t[1] << 2);
r[9 * i + 3] = (uint8_t) (t[1] >> 6);
r[9 * i + 4] = (uint8_t) (t[1] >> 14);
r[9 * i + 4] |= (uint8_t) (t[2] << 4);
r[9 * i + 5] = (uint8_t) (t[2] >> 4);
r[9 * i + 6] = (uint8_t) (t[2] >> 12);
r[9 * i + 6] |= (uint8_t) (t[3] << 6);
r[9 * i + 7] = (uint8_t) (t[3] >> 2);
r[9 * i + 8] = (uint8_t) (t[3] >> 10);
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyz_unpack
*
* Description: Unpack polynomial z with coefficients
* in [-(GAMMA1 - 1), GAMMA1].
*
* Arguments: - poly *r: pointer to output polynomial
* - const uint8_t *a: byte array with bit-packed polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyz_unpack(poly *r, const uint8_t *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N / 4; ++i) {
r->coeffs[4 * i + 0] = a[9 * i + 0];
r->coeffs[4 * i + 0] |= (uint32_t)a[9 * i + 1] << 8;
r->coeffs[4 * i + 0] |= (uint32_t)a[9 * i + 2] << 16;
r->coeffs[4 * i + 0] &= 0x3FFFF;
r->coeffs[4 * i + 1] = a[9 * i + 2] >> 2;
r->coeffs[4 * i + 1] |= (uint32_t)a[9 * i + 3] << 6;
r->coeffs[4 * i + 1] |= (uint32_t)a[9 * i + 4] << 14;
r->coeffs[4 * i + 1] &= 0x3FFFF;
r->coeffs[4 * i + 2] = a[9 * i + 4] >> 4;
r->coeffs[4 * i + 2] |= (uint32_t)a[9 * i + 5] << 4;
r->coeffs[4 * i + 2] |= (uint32_t)a[9 * i + 6] << 12;
r->coeffs[4 * i + 2] &= 0x3FFFF;
r->coeffs[4 * i + 3] = a[9 * i + 6] >> 6;
r->coeffs[4 * i + 3] |= (uint32_t)a[9 * i + 7] << 2;
r->coeffs[4 * i + 3] |= (uint32_t)a[9 * i + 8] << 10;
r->coeffs[4 * i + 3] &= 0x3FFFF;
r->coeffs[4 * i + 0] = GAMMA1 - r->coeffs[4 * i + 0];
r->coeffs[4 * i + 1] = GAMMA1 - r->coeffs[4 * i + 1];
r->coeffs[4 * i + 2] = GAMMA1 - r->coeffs[4 * i + 2];
r->coeffs[4 * i + 3] = GAMMA1 - r->coeffs[4 * i + 3];
}
DBENCH_STOP(*tpack);
}
/*************************************************
* Name: PQCLEAN_DILITHIUM2_CLEAN_polyw1_pack
*
* Description: Bit-pack polynomial w1 with coefficients in [0,15] or [0,43].
* Input coefficients are assumed to be standard representatives.
*
* Arguments: - uint8_t *r: pointer to output byte array with at least
* POLYW1_PACKEDBYTES bytes
* - const poly *a: pointer to input polynomial
**************************************************/
void PQCLEAN_DILITHIUM2_CLEAN_polyw1_pack(uint8_t *r, const poly *a) {
unsigned int i;
DBENCH_START();
for (i = 0; i < N / 4; ++i) {
r[3 * i + 0] = (uint8_t) a->coeffs[4 * i + 0];
r[3 * i + 0] |= (uint8_t) (a->coeffs[4 * i + 1] << 6);
r[3 * i + 1] = (uint8_t) (a->coeffs[4 * i + 1] >> 2);
r[3 * i + 1] |= (uint8_t) (a->coeffs[4 * i + 2] << 4);
r[3 * i + 2] = (uint8_t) (a->coeffs[4 * i + 2] >> 4);
r[3 * i + 2] |= (uint8_t) (a->coeffs[4 * i + 3] << 2);
}
DBENCH_STOP(*tpack);
}
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