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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include <stdbool.h>
#include "blapi.h"
#include "secerr.h"
#include "secitem.h"
#include "kyber-pqcrystals-ref.h"
#include "kyber.h"
/* Consistency check between kyber-pqcrystals-ref.h and kyber.h */
PR_STATIC_ASSERT(KYBER768_PUBLIC_KEY_BYTES == pqcrystals_kyber768_PUBLICKEYBYTES);
PR_STATIC_ASSERT(KYBER768_PRIVATE_KEY_BYTES == pqcrystals_kyber768_SECRETKEYBYTES);
PR_STATIC_ASSERT(KYBER768_CIPHERTEXT_BYTES == pqcrystals_kyber768_CIPHERTEXTBYTES);
PR_STATIC_ASSERT(KYBER_SHARED_SECRET_BYTES == pqcrystals_kyber768_BYTES);
PR_STATIC_ASSERT(KYBER_KEYPAIR_COIN_BYTES == pqcrystals_kyber768_KEYPAIRCOINBYTES);
PR_STATIC_ASSERT(KYBER_ENC_COIN_BYTES == pqcrystals_kyber768_ENCCOINBYTES);
static bool
valid_params(KyberParams params)
{
switch (params) {
case params_kyber768_round3:
case params_kyber768_round3_test_mode:
return true;
default:
return false;
}
}
static bool
valid_pubkey(KyberParams params, const SECItem *pubkey)
{
switch (params) {
case params_kyber768_round3:
case params_kyber768_round3_test_mode:
return pubkey && pubkey->len == KYBER768_PUBLIC_KEY_BYTES;
default:
return false;
}
}
static bool
valid_privkey(KyberParams params, const SECItem *privkey)
{
switch (params) {
case params_kyber768_round3:
case params_kyber768_round3_test_mode:
return privkey && privkey->len == KYBER768_PRIVATE_KEY_BYTES;
default:
return false;
}
}
static bool
valid_ciphertext(KyberParams params, const SECItem *ciphertext)
{
switch (params) {
case params_kyber768_round3:
case params_kyber768_round3_test_mode:
return ciphertext && ciphertext->len == KYBER768_CIPHERTEXT_BYTES;
default:
return false;
}
}
static bool
valid_secret(KyberParams params, const SECItem *secret)
{
switch (params) {
case params_kyber768_round3:
case params_kyber768_round3_test_mode:
return secret && secret->len == KYBER_SHARED_SECRET_BYTES;
default:
return false;
}
}
static bool
valid_keypair_seed(KyberParams params, const SECItem *seed)
{
switch (params) {
case params_kyber768_round3:
case params_kyber768_round3_test_mode:
return !seed || seed->len == KYBER_KEYPAIR_COIN_BYTES;
default:
return false;
}
}
static bool
valid_enc_seed(KyberParams params, const SECItem *seed)
{
switch (params) {
case params_kyber768_round3:
return !seed;
case params_kyber768_round3_test_mode:
return !seed || seed->len == KYBER_SHARED_SECRET_BYTES;
default:
return false;
}
}
SECStatus
Kyber_NewKey(KyberParams params, const SECItem *keypair_seed, SECItem *privkey, SECItem *pubkey)
{
if (!valid_params(params)) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return SECFailure;
}
if (!(valid_keypair_seed(params, keypair_seed) && valid_privkey(params, privkey) && valid_pubkey(params, pubkey))) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
uint8_t randbuf[KYBER_KEYPAIR_COIN_BYTES];
uint8_t *coins;
if (keypair_seed) {
coins = keypair_seed->data;
} else {
if (RNG_GenerateGlobalRandomBytes(randbuf, sizeof randbuf) != SECSuccess) {
PORT_SetError(SEC_ERROR_NEED_RANDOM);
return SECFailure;
}
coins = randbuf;
}
NSS_CLASSIFY(coins, KYBER_KEYPAIR_COIN_BYTES);
if (params == params_kyber768_round3 || params == params_kyber768_round3_test_mode) {
pqcrystals_kyber768_ref_keypair_derand(pubkey->data, privkey->data, coins);
} else {
/* unreachable */
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
NSS_DECLASSIFY(pubkey->data, pubkey->len);
return SECSuccess;
}
SECStatus
Kyber_Encapsulate(KyberParams params, const SECItem *enc_seed, const SECItem *pubkey, SECItem *ciphertext, SECItem *secret)
{
if (!valid_params(params)) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return SECFailure;
}
if (!(valid_enc_seed(params, enc_seed) && valid_pubkey(params, pubkey) && valid_ciphertext(params, ciphertext) && valid_secret(params, secret))) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
uint8_t randbuf[KYBER_ENC_COIN_BYTES];
uint8_t *coins;
if (enc_seed) {
coins = enc_seed->data;
} else {
if (RNG_GenerateGlobalRandomBytes(randbuf, sizeof randbuf) != SECSuccess) {
PORT_SetError(SEC_ERROR_NEED_RANDOM);
return SECFailure;
}
coins = randbuf;
}
NSS_CLASSIFY(coins, KYBER_ENC_COIN_BYTES);
if (params == params_kyber768_round3 || params == params_kyber768_round3_test_mode) {
pqcrystals_kyber768_ref_enc_derand(ciphertext->data, secret->data, pubkey->data, coins);
} else {
/* unreachable */
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
return SECSuccess;
}
SECStatus
Kyber_Decapsulate(KyberParams params, const SECItem *privkey, const SECItem *ciphertext, SECItem *secret)
{
if (!valid_params(params)) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return SECFailure;
}
if (!(valid_privkey(params, privkey) && valid_ciphertext(params, ciphertext) && valid_secret(params, secret))) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (params == params_kyber768_round3 || params == params_kyber768_round3_test_mode) {
pqcrystals_kyber768_ref_dec(secret->data, ciphertext->data, privkey->data);
} else {
// unreachable
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
return SECSuccess;
}
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