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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h> /* memset */
#include "internal/ffc.h"
#ifndef FIPS_MODE
# include <openssl/asn1.h> /* ffc_params_print */
#endif
void ffc_params_init(FFC_PARAMS *params)
{
memset(params, 0, sizeof(FFC_PARAMS));
params->pcounter = -1;
params->gindex = FFC_UNVERIFIABLE_GINDEX;
}
void ffc_params_cleanup(FFC_PARAMS *params)
{
BN_free(params->p);
BN_free(params->q);
BN_free(params->g);
BN_free(params->j);
OPENSSL_free(params->seed);
ffc_params_init(params);
}
void ffc_params_set0_pqg(FFC_PARAMS *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
if (p != NULL && p != d->p) {
BN_free(d->p);
d->p = p;
}
if (q != NULL && q != d->q) {
BN_free(d->q);
d->q = q;
}
if (g != NULL && g != d->g) {
BN_free(d->g);
d->g = g;
}
}
void ffc_params_get0_pqg(const FFC_PARAMS *d, const BIGNUM **p,
const BIGNUM **q, const BIGNUM **g)
{
if (p != NULL)
*p = d->p;
if (q != NULL)
*q = d->q;
if (g != NULL)
*g = d->g;
}
/* j is the 'cofactor' that is optionally output for ASN1. */
void ffc_params_set0_j(FFC_PARAMS *d, BIGNUM *j)
{
BN_free(d->j);
d->j = NULL;
if (j != NULL)
d->j = j;
}
int ffc_params_set_validate_params(FFC_PARAMS *params,
const unsigned char *seed, size_t seedlen,
int counter)
{
if (params == NULL)
return 0;
if (params->seed != NULL)
OPENSSL_free(params->seed);
if (seed != NULL && seedlen > 0) {
params->seed = OPENSSL_memdup(seed, seedlen);
if (params->seed == NULL)
return 0;
params->seedlen = seedlen;
} else {
params->seed = NULL;
params->seedlen = 0;
}
params->pcounter = counter;
return 1;
}
void ffc_params_get_validate_params(const FFC_PARAMS *params,
unsigned char **seed, size_t *seedlen,
int *pcounter)
{
if (seed != NULL)
*seed = params->seed;
if (seedlen != NULL)
*seedlen = params->seedlen;
if (pcounter != NULL)
*pcounter = params->pcounter;
}
static int ffc_bn_cpy(BIGNUM **dst, const BIGNUM *src)
{
BIGNUM *a;
/*
* If source is read only just copy the pointer, so
* we don't have to reallocate it.
*/
if (src == NULL)
a = NULL;
else if (BN_get_flags(src, BN_FLG_STATIC_DATA)
&& !BN_get_flags(src, BN_FLG_MALLOCED))
a = (BIGNUM *)src;
else if ((a = BN_dup(src)) == NULL)
return 0;
BN_clear_free(*dst);
*dst = a;
return 1;
}
int ffc_params_copy(FFC_PARAMS *dst, const FFC_PARAMS *src)
{
if (!ffc_bn_cpy(&dst->p, src->p)
|| !ffc_bn_cpy(&dst->g, src->g)
|| !ffc_bn_cpy(&dst->q, src->q)
|| !ffc_bn_cpy(&dst->j, src->j))
return 0;
OPENSSL_free(dst->seed);
dst->seedlen = src->seedlen;
if (src->seed != NULL) {
dst->seed = OPENSSL_memdup(src->seed, src->seedlen);
if (dst->seed == NULL)
return 0;
} else {
dst->seed = NULL;
}
dst->pcounter = src->pcounter;
return 1;
}
int ffc_params_cmp(const FFC_PARAMS *a, const FFC_PARAMS *b, int ignore_q)
{
return BN_cmp(a->p, b->p) == 0
&& BN_cmp(a->g, b->g) == 0
&& (ignore_q || BN_cmp(a->q, b->q) == 0); /* Note: q may be NULL */
}
#ifndef FIPS_MODE
int ffc_params_print(BIO *bp, const FFC_PARAMS *ffc, int indent)
{
if (!ASN1_bn_print(bp, "prime P:", ffc->p, NULL, indent))
goto err;
if (!ASN1_bn_print(bp, "generator G:", ffc->g, NULL, indent))
goto err;
if (ffc->q != NULL
&& !ASN1_bn_print(bp, "subgroup order Q:", ffc->q, NULL, indent))
goto err;
if (ffc->j != NULL
&& !ASN1_bn_print(bp, "subgroup factor:", ffc->j, NULL, indent))
goto err;
if (ffc->seed != NULL) {
size_t i;
BIO_indent(bp, indent, 128);
BIO_puts(bp, "seed:");
for (i = 0; i < ffc->seedlen; i++) {
if ((i % 15) == 0) {
if (BIO_puts(bp, "\n") <= 0
|| !BIO_indent(bp, indent + 4, 128))
goto err;
}
if (BIO_printf(bp, "%02x%s", ffc->seed[i],
((i + 1) == ffc->seedlen) ? "" : ":") <= 0)
goto err;
}
if (BIO_write(bp, "\n", 1) <= 0)
return 0;
}
if (ffc->pcounter != -1) {
BIO_indent(bp, indent, 128);
if (BIO_printf(bp, "counter: %d\n", ffc->pcounter) <= 0)
goto err;
}
return 1;
err:
return 0;
}
#endif /* FIPS_MODE */
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