172 lines
6.0 KiB
C
172 lines
6.0 KiB
C
#include <stdio.h>
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#include "polyvec.h"
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#include "fips202.h"
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#include "cbd.h"
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#include "reduce.h"
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/*************************************************
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* Name: polyvec_compress
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*
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* Description: Compress and serialize vector of polynomials
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*
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* Arguments: - unsigned char *r: pointer to output byte array
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* - const polyvec *a: pointer to input vector of polynomials
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**************************************************/
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void polyvec_compress(unsigned char *r, const polyvec *a)
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{
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int i,j,k;
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uint16_t t[8];
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for(i=0;i<KYBER_K;i++)
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{
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for(j=0;j<KYBER_N/8;j++)
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{
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for(k=0;k<8;k++)
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t[k] = ((((uint32_t)freeze(a->vec[i].coeffs[8*j+k]) << 11) + KYBER_Q/2)/ KYBER_Q) & 0x7ff;
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r[11*j+ 0] = t[0] & 0xff;
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r[11*j+ 1] = (t[0] >> 8) | ((t[1] & 0x1f) << 3);
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r[11*j+ 2] = (t[1] >> 5) | ((t[2] & 0x03) << 6);
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r[11*j+ 3] = (t[2] >> 2) & 0xff;
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r[11*j+ 4] = (t[2] >> 10) | ((t[3] & 0x7f) << 1);
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r[11*j+ 5] = (t[3] >> 7) | ((t[4] & 0x0f) << 4);
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r[11*j+ 6] = (t[4] >> 4) | ((t[5] & 0x01) << 7);
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r[11*j+ 7] = (t[5] >> 1) & 0xff;
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r[11*j+ 8] = (t[5] >> 9) | ((t[6] & 0x3f) << 2);
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r[11*j+ 9] = (t[6] >> 6) | ((t[7] & 0x07) << 5);
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r[11*j+10] = (t[7] >> 3);
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}
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r += 352;
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}
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}
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/*************************************************
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* Name: polyvec_decompress
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*
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* Description: De-serialize and decompress vector of polynomials;
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* approximate inverse of polyvec_compress
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*
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* Arguments: - polyvec *r: pointer to output vector of polynomials
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* - unsigned char *a: pointer to input byte array
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**************************************************/
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void polyvec_decompress(polyvec *r, const unsigned char *a)
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{
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int i,j;
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for(i=0;i<KYBER_K;i++)
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{
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for(j=0;j<KYBER_N/8;j++)
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{
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r->vec[i].coeffs[8*j+0] = (((a[11*j+ 0] | (((uint32_t)a[11*j+ 1] & 0x07) << 8)) * KYBER_Q) +1024) >> 11;
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r->vec[i].coeffs[8*j+1] = ((((a[11*j+ 1] >> 3) | (((uint32_t)a[11*j+ 2] & 0x3f) << 5)) * KYBER_Q) +1024) >> 11;
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r->vec[i].coeffs[8*j+2] = ((((a[11*j+ 2] >> 6) | (((uint32_t)a[11*j+ 3] & 0xff) << 2) | (((uint32_t)a[11*j+ 4] & 0x01) << 10)) * KYBER_Q) + 1024) >> 11;
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r->vec[i].coeffs[8*j+3] = ((((a[11*j+ 4] >> 1) | (((uint32_t)a[11*j+ 5] & 0x0f) << 7)) * KYBER_Q) + 1024) >> 11;
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r->vec[i].coeffs[8*j+4] = ((((a[11*j+ 5] >> 4) | (((uint32_t)a[11*j+ 6] & 0x7f) << 4)) * KYBER_Q) + 1024) >> 11;
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r->vec[i].coeffs[8*j+5] = ((((a[11*j+ 6] >> 7) | (((uint32_t)a[11*j+ 7] & 0xff) << 1) | (((uint32_t)a[11*j+ 8] & 0x03) << 9)) * KYBER_Q) + 1024) >> 11;
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r->vec[i].coeffs[8*j+6] = ((((a[11*j+ 8] >> 2) | (((uint32_t)a[11*j+ 9] & 0x1f) << 6)) * KYBER_Q) + 1024) >> 11;
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r->vec[i].coeffs[8*j+7] = ((((a[11*j+ 9] >> 5) | (((uint32_t)a[11*j+10] & 0xff) << 3)) * KYBER_Q) + 1024) >> 11;
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}
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a += 352;
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}
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}
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/*************************************************
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* Name: polyvec_tobytes
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*
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* Description: Serialize vector of polynomials
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*
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* Arguments: - unsigned char *r: pointer to output byte array
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* - const polyvec *a: pointer to input vector of polynomials
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**************************************************/
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void polyvec_tobytes(unsigned char *r, const polyvec *a)
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{
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int i;
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for(i=0;i<KYBER_K;i++)
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poly_tobytes(r+i*KYBER_POLYBYTES, &a->vec[i]);
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}
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/*************************************************
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* Name: polyvec_frombytes
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*
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* Description: De-serialize vector of polynomials;
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* inverse of polyvec_tobytes
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*
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* Arguments: - unsigned char *r: pointer to output byte array
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* - const polyvec *a: pointer to input vector of polynomials
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**************************************************/
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void polyvec_frombytes(polyvec *r, const unsigned char *a)
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{
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int i;
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for(i=0;i<KYBER_K;i++)
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poly_frombytes(&r->vec[i], a+i*KYBER_POLYBYTES);
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}
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/*************************************************
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* Name: polyvec_ntt
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*
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* Description: Apply forward NTT to all elements of a vector of polynomials
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*
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* Arguments: - polyvec *r: pointer to in/output vector of polynomials
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**************************************************/
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void polyvec_ntt(polyvec *r)
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{
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int i;
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for(i=0;i<KYBER_K;i++)
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poly_ntt(&r->vec[i]);
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}
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/*************************************************
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* Name: polyvec_invntt
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*
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* Description: Apply inverse NTT to all elements of a vector of polynomials
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*
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* Arguments: - polyvec *r: pointer to in/output vector of polynomials
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**************************************************/
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void polyvec_invntt(polyvec *r)
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{
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int i;
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for(i=0;i<KYBER_K;i++)
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poly_invntt(&r->vec[i]);
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}
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/*************************************************
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* Name: polyvec_pointwise_acc
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*
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* Description: Pointwise multiply elements of a and b and accumulate into r
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const polyvec *a: pointer to first input vector of polynomials
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* - const polyvec *b: pointer to second input vector of polynomials
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**************************************************/
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void polyvec_pointwise_acc(poly *r, const polyvec *a, const polyvec *b)
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{
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int i,j;
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uint16_t t;
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for(j=0;j<KYBER_N;j++)
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{
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t = montgomery_reduce(4613* (uint32_t)b->vec[0].coeffs[j]); // 4613 = 2^{2*18} % q
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r->coeffs[j] = montgomery_reduce(a->vec[0].coeffs[j] * t);
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for(i=1;i<KYBER_K;i++)
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{
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t = montgomery_reduce(4613* (uint32_t)b->vec[i].coeffs[j]);
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r->coeffs[j] += montgomery_reduce(a->vec[i].coeffs[j] * t);
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}
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r->coeffs[j] = barrett_reduce(r->coeffs[j]);
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}
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}
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/*************************************************
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* Name: polyvec_add
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*
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* Description: Add vectors of polynomials
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*
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* Arguments: - polyvec *r: pointer to output vector of polynomials
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* - const polyvec *a: pointer to first input vector of polynomials
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* - const polyvec *b: pointer to second input vector of polynomials
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**************************************************/
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void polyvec_add(polyvec *r, const polyvec *a, const polyvec *b)
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{
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int i;
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for(i=0;i<KYBER_K;i++)
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poly_add(&r->vec[i], &a->vec[i], &b->vec[i]);
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}
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