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/*
* Copyright 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 <openssl/core_names.h>
#include <openssl/params.h>
#include "crypto/rsa.h"
/*
* The intention with the "backend" source file is to offer backend support
* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
* implementations alike.
*/
DEFINE_STACK_OF(BIGNUM)
static int collect_numbers(STACK_OF(BIGNUM) *numbers,
const OSSL_PARAM params[], const char *names[])
{
const OSSL_PARAM *p = NULL;
int i;
if (numbers == NULL)
return 0;
for (i = 0; names[i] != NULL; i++){
p = OSSL_PARAM_locate_const(params, names[i]);
if (p != NULL) {
BIGNUM *tmp = NULL;
if (!OSSL_PARAM_get_BN(p, &tmp)
|| sk_BIGNUM_push(numbers, tmp) == 0)
return 0;
}
}
return 1;
}
int rsa_fromdata(RSA *rsa, const OSSL_PARAM params[])
{
const OSSL_PARAM *param_n, *param_e, *param_d;
BIGNUM *n = NULL, *e = NULL, *d = NULL;
STACK_OF(BIGNUM) *factors = NULL, *exps = NULL, *coeffs = NULL;
int is_private = 0;
if (rsa == NULL)
return 0;
param_n = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_N);
param_e = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E);
param_d = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_D);
if ((param_n != NULL && !OSSL_PARAM_get_BN(param_n, &n))
|| (param_e != NULL && !OSSL_PARAM_get_BN(param_e, &e))
|| (param_d != NULL && !OSSL_PARAM_get_BN(param_d, &d)))
goto err;
is_private = (d != NULL);
if (!RSA_set0_key(rsa, n, e, d))
goto err;
n = e = d = NULL;
if (is_private) {
if (!collect_numbers(factors = sk_BIGNUM_new_null(), params,
rsa_mp_factor_names)
|| !collect_numbers(exps = sk_BIGNUM_new_null(), params,
rsa_mp_exp_names)
|| !collect_numbers(coeffs = sk_BIGNUM_new_null(), params,
rsa_mp_coeff_names))
goto err;
/* It's ok if this private key just has n, e and d */
if (sk_BIGNUM_num(factors) != 0
&& !rsa_set0_all_params(rsa, factors, exps, coeffs))
goto err;
}
sk_BIGNUM_free(factors);
sk_BIGNUM_free(exps);
sk_BIGNUM_free(coeffs);
return 1;
err:
BN_free(n);
BN_free(e);
BN_free(d);
sk_BIGNUM_pop_free(factors, BN_free);
sk_BIGNUM_pop_free(exps, BN_free);
sk_BIGNUM_pop_free(coeffs, BN_free);
return 0;
}
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