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/*
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* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/core_numbers.h>
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#include <openssl/core_names.h>
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/params.h>
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#include <openssl/types.h>
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#include "internal/param_build.h"
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#include "prov/implementations.h"
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#include "prov/providercommon.h"
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#include "crypto/rsa.h"
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static OSSL_OP_keymgmt_importkey_fn rsa_importkey;
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static OSSL_OP_keymgmt_exportkey_fn rsa_exportkey;
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static OSSL_OP_keymgmt_get_key_params_fn rsa_get_key_params;
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DEFINE_STACK_OF(BIGNUM)
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DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)
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static int collect_numbers(STACK_OF(BIGNUM) *numbers,
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const OSSL_PARAM params[], const char *key)
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{
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const OSSL_PARAM *p = NULL;
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if (numbers == NULL)
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return 0;
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for (p = params; (p = OSSL_PARAM_locate_const(p, key)) != NULL; p++) {
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BIGNUM *tmp = NULL;
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if (!OSSL_PARAM_get_BN(p, &tmp))
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return 0;
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sk_BIGNUM_push(numbers, tmp);
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}
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return 1;
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}
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static int params_to_key(RSA *rsa, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_n, *param_e, *param_d;
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BIGNUM *n = NULL, *e = NULL, *d = NULL;
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STACK_OF(BIGNUM) *factors = NULL, *exps = NULL, *coeffs = NULL;
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int is_private = 0;
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if (rsa == NULL)
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return 0;
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param_n = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_N);
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param_e = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E);
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param_d = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_D);
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if ((param_n != NULL && !OSSL_PARAM_get_BN(param_n, &n))
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|| (param_e != NULL && !OSSL_PARAM_get_BN(param_e, &e))
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|| (param_d != NULL && !OSSL_PARAM_get_BN(param_d, &d)))
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goto err;
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is_private = (d != NULL);
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if (!RSA_set0_key(rsa, n, e, d))
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goto err;
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n = e = d = NULL;
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if (is_private) {
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if (!collect_numbers(factors = sk_BIGNUM_new_null(), params,
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OSSL_PKEY_PARAM_RSA_FACTOR)
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|| !collect_numbers(exps = sk_BIGNUM_new_null(), params,
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OSSL_PKEY_PARAM_RSA_EXPONENT)
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|| !collect_numbers(coeffs = sk_BIGNUM_new_null(), params,
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OSSL_PKEY_PARAM_RSA_COEFFICIENT))
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goto err;
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/* It's ok if this private key just has n, e and d */
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if (sk_BIGNUM_num(factors) != 0
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&& !rsa_set0_all_params(rsa, factors, exps, coeffs))
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goto err;
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}
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sk_BIGNUM_free(factors);
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sk_BIGNUM_free(exps);
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sk_BIGNUM_free(coeffs);
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return 1;
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err:
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BN_free(n);
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BN_free(e);
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BN_free(d);
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sk_BIGNUM_pop_free(factors, BN_free);
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sk_BIGNUM_pop_free(exps, BN_free);
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sk_BIGNUM_pop_free(coeffs, BN_free);
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return 0;
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}
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static int export_numbers(OSSL_PARAM_BLD *tmpl, const char *key,
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STACK_OF(BIGNUM_const) *numbers)
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{
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int i, nnum;
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if (numbers == NULL)
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return 0;
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nnum = sk_BIGNUM_const_num(numbers);
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for (i = 0; i < nnum; i++) {
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if (!ossl_param_bld_push_BN(tmpl, key,
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sk_BIGNUM_const_value(numbers, i)))
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return 0;
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}
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return 1;
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}
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static int key_to_params(RSA *rsa, OSSL_PARAM_BLD *tmpl)
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{
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int ret = 0;
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const BIGNUM *rsa_d = NULL, *rsa_n = NULL, *rsa_e = NULL;
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STACK_OF(BIGNUM_const) *factors = sk_BIGNUM_const_new_null();
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STACK_OF(BIGNUM_const) *exps = sk_BIGNUM_const_new_null();
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STACK_OF(BIGNUM_const) *coeffs = sk_BIGNUM_const_new_null();
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if (rsa == NULL || factors == NULL || exps == NULL || coeffs == NULL)
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goto err;
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RSA_get0_key(rsa, &rsa_n, &rsa_e, &rsa_d);
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rsa_get0_all_params(rsa, factors, exps, coeffs);
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if (rsa_n != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_RSA_N, rsa_n))
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goto err;
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if (rsa_e != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_RSA_E, rsa_e))
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goto err;
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if (rsa_d != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_RSA_D, rsa_d))
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goto err;
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if (!export_numbers(tmpl, OSSL_PKEY_PARAM_RSA_FACTOR, factors)
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|| !export_numbers(tmpl, OSSL_PKEY_PARAM_RSA_EXPONENT, exps)
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|| !export_numbers(tmpl, OSSL_PKEY_PARAM_RSA_COEFFICIENT, coeffs))
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goto err;
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ret = 1;
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err:
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sk_BIGNUM_const_free(factors);
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sk_BIGNUM_const_free(exps);
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sk_BIGNUM_const_free(coeffs);
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return ret;
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}
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static void *rsa_importkey(void *provctx, const OSSL_PARAM params[])
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{
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RSA *rsa;
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if ((rsa = RSA_new()) == NULL
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|| !params_to_key(rsa, params)) {
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RSA_free(rsa);
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rsa = NULL;
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}
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return rsa;
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}
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static int rsa_exportkey(void *key, OSSL_CALLBACK *param_callback, void *cbarg)
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{
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RSA *rsa = key;
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OSSL_PARAM_BLD tmpl;
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OSSL_PARAM *params = NULL;
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int ret;
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ossl_param_bld_init(&tmpl);
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if (rsa == NULL
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|| !key_to_params(rsa, &tmpl)
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|| (params = ossl_param_bld_to_param(&tmpl)) == NULL)
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return 0;
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ret = param_callback(params, cbarg);
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ossl_param_bld_free(params);
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return ret;
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}
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/*
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* This provider can export everything in an RSA key, so we use the exact
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* same type description for export as for import. Other providers might
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* choose to import full keys, but only export the public parts, and will
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* therefore have the importkey_types and importkey_types functions return
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* different arrays.
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*/
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static const OSSL_PARAM rsa_key_types[] = {
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_N, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_D, NULL, 0),
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/* We tolerate up to 10 factors... */
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
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/* ..., up to 10 CRT exponents... */
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
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/* ..., and up to 9 CRT coefficients */
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
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};
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/*
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* We lied about the amount of factors, exponents and coefficients, the
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* export and import functions can really deal with an infinite amount
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* of these numbers. However, RSA keys with too many primes are futile,
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* so we at least pretend to have some limits.
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*/
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static const OSSL_PARAM *rsa_exportkey_types(void)
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{
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return rsa_key_types;
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}
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static const OSSL_PARAM *rsa_importkey_types(void)
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{
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return rsa_key_types;
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}
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static int rsa_get_key_params(void *key, OSSL_PARAM params[])
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{
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RSA *rsa = key;
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OSSL_PARAM *p;
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if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
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&& !OSSL_PARAM_set_int(p, RSA_bits(rsa)))
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return 0;
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if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
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&& !OSSL_PARAM_set_int(p, RSA_security_bits(rsa)))
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return 0;
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if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
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&& !OSSL_PARAM_set_int(p, RSA_size(rsa)))
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return 0;
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return 1;
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}
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const OSSL_DISPATCH rsa_keymgmt_functions[] = {
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{ OSSL_FUNC_KEYMGMT_IMPORTKEY, (void (*)(void))rsa_importkey },
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{ OSSL_FUNC_KEYMGMT_IMPORTKEY_TYPES, (void (*)(void))rsa_importkey_types },
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{ OSSL_FUNC_KEYMGMT_EXPORTKEY, (void (*)(void))rsa_exportkey },
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{ OSSL_FUNC_KEYMGMT_EXPORTKEY_TYPES, (void (*)(void))rsa_exportkey_types },
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{ OSSL_FUNC_KEYMGMT_FREEKEY, (void (*)(void))RSA_free },
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{ OSSL_FUNC_KEYMGMT_GET_KEY_PARAMS, (void (*) (void))rsa_get_key_params },
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{ 0, NULL }
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};
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