262 lines
8.5 KiB
C
262 lines
8.5 KiB
C
#include "packing.h"
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#include "params.h"
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#include "poly.h"
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#include "polyvec.h"
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_CLEAN_pack_pk
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*
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* Description: Bit-pack public key pk = (rho, t1).
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*
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* Arguments: - uint8_t pk[]: output byte array
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* - const uint8_t rho[]: byte array containing rho
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* - const polyveck *t1: pointer to vector t1
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**************************************************/
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void PQCLEAN_DILITHIUM2_CLEAN_pack_pk(uint8_t pk[PQCLEAN_DILITHIUM2_CLEAN_CRYPTO_PUBLICKEYBYTES],
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const uint8_t rho[SEEDBYTES],
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const polyveck *t1) {
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unsigned int i;
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for (i = 0; i < SEEDBYTES; ++i) {
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pk[i] = rho[i];
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}
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pk += SEEDBYTES;
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for (i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyt1_pack(pk + i * POLYT1_PACKEDBYTES, &t1->vec[i]);
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}
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_CLEAN_unpack_pk
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*
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* Description: Unpack public key pk = (rho, t1).
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*
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* Arguments: - const uint8_t rho[]: output byte array for rho
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* - const polyveck *t1: pointer to output vector t1
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* - uint8_t pk[]: byte array containing bit-packed pk
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**************************************************/
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void PQCLEAN_DILITHIUM2_CLEAN_unpack_pk(uint8_t rho[SEEDBYTES],
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polyveck *t1,
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const uint8_t pk[PQCLEAN_DILITHIUM2_CLEAN_CRYPTO_PUBLICKEYBYTES]) {
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unsigned int i;
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for (i = 0; i < SEEDBYTES; ++i) {
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rho[i] = pk[i];
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}
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pk += SEEDBYTES;
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for (i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyt1_unpack(&t1->vec[i], pk + i * POLYT1_PACKEDBYTES);
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}
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_CLEAN_pack_sk
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*
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* Description: Bit-pack secret key sk = (rho, tr, key, t0, s1, s2).
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*
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* Arguments: - uint8_t sk[]: output byte array
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* - const uint8_t rho[]: byte array containing rho
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* - const uint8_t tr[]: byte array containing tr
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* - const uint8_t key[]: byte array containing key
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* - const polyveck *t0: pointer to vector t0
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* - const polyvecl *s1: pointer to vector s1
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* - const polyveck *s2: pointer to vector s2
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**************************************************/
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void PQCLEAN_DILITHIUM2_CLEAN_pack_sk(uint8_t sk[PQCLEAN_DILITHIUM2_CLEAN_CRYPTO_SECRETKEYBYTES],
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const uint8_t rho[SEEDBYTES],
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const uint8_t tr[SEEDBYTES],
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const uint8_t key[SEEDBYTES],
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const polyveck *t0,
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const polyvecl *s1,
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const polyveck *s2) {
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unsigned int i;
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for (i = 0; i < SEEDBYTES; ++i) {
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sk[i] = rho[i];
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}
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sk += SEEDBYTES;
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for (i = 0; i < SEEDBYTES; ++i) {
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sk[i] = key[i];
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}
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sk += SEEDBYTES;
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for (i = 0; i < SEEDBYTES; ++i) {
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sk[i] = tr[i];
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}
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sk += SEEDBYTES;
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for (i = 0; i < L; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyeta_pack(sk + i * POLYETA_PACKEDBYTES, &s1->vec[i]);
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}
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sk += L * POLYETA_PACKEDBYTES;
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for (i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyeta_pack(sk + i * POLYETA_PACKEDBYTES, &s2->vec[i]);
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}
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sk += K * POLYETA_PACKEDBYTES;
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for (i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyt0_pack(sk + i * POLYT0_PACKEDBYTES, &t0->vec[i]);
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}
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_CLEAN_unpack_sk
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*
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* Description: Unpack secret key sk = (rho, tr, key, t0, s1, s2).
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*
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* Arguments: - const uint8_t rho[]: output byte array for rho
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* - const uint8_t tr[]: output byte array for tr
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* - const uint8_t key[]: output byte array for key
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* - const polyveck *t0: pointer to output vector t0
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* - const polyvecl *s1: pointer to output vector s1
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* - const polyveck *s2: pointer to output vector s2
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* - uint8_t sk[]: byte array containing bit-packed sk
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**************************************************/
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void PQCLEAN_DILITHIUM2_CLEAN_unpack_sk(uint8_t rho[SEEDBYTES],
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uint8_t tr[SEEDBYTES],
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uint8_t key[SEEDBYTES],
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polyveck *t0,
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polyvecl *s1,
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polyveck *s2,
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const uint8_t sk[PQCLEAN_DILITHIUM2_CLEAN_CRYPTO_SECRETKEYBYTES]) {
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unsigned int i;
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for (i = 0; i < SEEDBYTES; ++i) {
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rho[i] = sk[i];
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}
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sk += SEEDBYTES;
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for (i = 0; i < SEEDBYTES; ++i) {
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key[i] = sk[i];
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}
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sk += SEEDBYTES;
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for (i = 0; i < SEEDBYTES; ++i) {
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tr[i] = sk[i];
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}
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sk += SEEDBYTES;
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for (i = 0; i < L; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyeta_unpack(&s1->vec[i], sk + i * POLYETA_PACKEDBYTES);
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}
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sk += L * POLYETA_PACKEDBYTES;
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for (i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyeta_unpack(&s2->vec[i], sk + i * POLYETA_PACKEDBYTES);
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}
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sk += K * POLYETA_PACKEDBYTES;
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for (i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyt0_unpack(&t0->vec[i], sk + i * POLYT0_PACKEDBYTES);
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}
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_CLEAN_pack_sig
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*
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* Description: Bit-pack signature sig = (c, z, h).
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*
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* Arguments: - uint8_t sig[]: output byte array
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* - const uint8_t *c: pointer to PQCLEAN_DILITHIUM2_CLEAN_challenge hash length SEEDBYTES
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* - const polyvecl *z: pointer to vector z
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* - const polyveck *h: pointer to hint vector h
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**************************************************/
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void PQCLEAN_DILITHIUM2_CLEAN_pack_sig(uint8_t sig[PQCLEAN_DILITHIUM2_CLEAN_CRYPTO_BYTES],
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const uint8_t c[SEEDBYTES],
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const polyvecl *z,
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const polyveck *h) {
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unsigned int i, j, k;
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for (i = 0; i < SEEDBYTES; ++i) {
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sig[i] = c[i];
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}
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sig += SEEDBYTES;
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for (i = 0; i < L; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyz_pack(sig + i * POLYZ_PACKEDBYTES, &z->vec[i]);
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}
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sig += L * POLYZ_PACKEDBYTES;
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/* Encode h */
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for (i = 0; i < OMEGA + K; ++i) {
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sig[i] = 0;
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}
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k = 0;
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for (i = 0; i < K; ++i) {
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for (j = 0; j < N; ++j) {
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if (h->vec[i].coeffs[j] != 0) {
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sig[k++] = (uint8_t) j;
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}
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}
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sig[OMEGA + i] = (uint8_t) k;
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}
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_CLEAN_unpack_sig
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*
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* Description: Unpack signature sig = (c, z, h).
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*
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* Arguments: - uint8_t *c: pointer to output PQCLEAN_DILITHIUM2_CLEAN_challenge hash
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* - polyvecl *z: pointer to output vector z
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* - polyveck *h: pointer to output hint vector h
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* - const uint8_t sig[]: byte array containing
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* bit-packed signature
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*
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* Returns 1 in case of malformed signature; otherwise 0.
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**************************************************/
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int PQCLEAN_DILITHIUM2_CLEAN_unpack_sig(uint8_t c[SEEDBYTES],
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polyvecl *z,
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polyveck *h,
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const uint8_t sig[PQCLEAN_DILITHIUM2_CLEAN_CRYPTO_BYTES]) {
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unsigned int i, j, k;
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for (i = 0; i < SEEDBYTES; ++i) {
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c[i] = sig[i];
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}
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sig += SEEDBYTES;
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for (i = 0; i < L; ++i) {
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PQCLEAN_DILITHIUM2_CLEAN_polyz_unpack(&z->vec[i], sig + i * POLYZ_PACKEDBYTES);
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}
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sig += L * POLYZ_PACKEDBYTES;
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/* Decode h */
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k = 0;
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for (i = 0; i < K; ++i) {
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for (j = 0; j < N; ++j) {
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h->vec[i].coeffs[j] = 0;
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}
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if (sig[OMEGA + i] < k || sig[OMEGA + i] > OMEGA) {
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return 1;
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}
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for (j = k; j < sig[OMEGA + i]; ++j) {
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/* Coefficients are ordered for strong unforgeability */
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if (j > k && sig[j] <= sig[j - 1]) {
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return 1;
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}
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h->vec[i].coeffs[sig[j]] = 1;
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}
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k = sig[OMEGA + i];
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}
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/* Extra indices are zero for strong unforgeability */
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for (j = k; j < OMEGA; ++j) {
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if (sig[j]) {
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return 1;
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}
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}
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return 0;
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}
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