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/*
* Copyright 2025 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
typedef enum OPTION_choice {
OPT_COMMON,
OPT_PROV_ENUM,
OPT_CIPHER,
OPT_SKEYOPT, OPT_SKEYMGMT, OPT_GENKEY
} OPTION_CHOICE;
const OPTIONS skeyutl_options[] = {
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
{"skeyopt", OPT_SKEYOPT, 's', "Key options as opt:value for opaque keys handling"},
{"skeymgmt", OPT_SKEYMGMT, 's', "Symmetric key management name for opaque keys handling"},
{"genkey", OPT_GENKEY, '-', "Generate an opaque symmetric key"},
{"cipher", OPT_CIPHER, 's', "The cipher to generate key for"},
OPT_PROV_OPTIONS,
{NULL}
};
int skeyutl_main(int argc, char **argv)
{
EVP_CIPHER *cipher = NULL;
int ret = 1;
OPTION_CHOICE o;
int genkey = 0;
char *prog, *ciphername = NULL;
STACK_OF(OPENSSL_STRING) *skeyopts = NULL;
const char *skeymgmt = NULL;
EVP_SKEY *skey = NULL;
EVP_SKEYMGMT *mgmt = NULL;
prog = opt_init(argc, argv, skeyutl_options);
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
case OPT_EOF:
case OPT_ERR:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto end;
case OPT_HELP:
opt_help(skeyutl_options);
ret = 0;
goto end;
case OPT_GENKEY:
genkey = 1;
break;
case OPT_CIPHER:
ciphername = opt_arg();
break;
case OPT_SKEYOPT:
if ((skeyopts == NULL &&
(skeyopts = sk_OPENSSL_STRING_new_null()) == NULL) ||
sk_OPENSSL_STRING_push(skeyopts, opt_arg()) == 0) {
BIO_printf(bio_err, "%s: out of memory\n", prog);
goto end;
}
break;
case OPT_SKEYMGMT:
skeymgmt = opt_arg();
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto end;
break;
}
}
/* Get the cipher name, either from progname (if set) or flag. */
if (!opt_cipher_any(ciphername, &cipher))
goto opthelp;
if (cipher == NULL && skeymgmt == NULL) {
BIO_printf(bio_err, "Either -skeymgmt -or -cipher option should be specified\n");
goto end;
}
if (genkey) {
OSSL_PARAM *params = NULL;
mgmt = EVP_SKEYMGMT_fetch(app_get0_libctx(),
skeymgmt ? skeymgmt : EVP_CIPHER_name(cipher),
app_get0_propq());
if (mgmt == NULL)
goto end;
params = app_params_new_from_opts(skeyopts,
EVP_SKEYMGMT_get0_gen_settable_params(mgmt));
skey = EVP_SKEY_generate(app_get0_libctx(),
skeymgmt ? skeymgmt : EVP_CIPHER_name(cipher),
app_get0_propq(), params);
OSSL_PARAM_free(params);
if (skey == NULL) {
BIO_printf(bio_err, "Error creating opaque key for skeymgmt %s\n",
skeymgmt ? skeymgmt : EVP_CIPHER_name(cipher));
ERR_print_errors(bio_err);
} else {
const char *key_name = EVP_SKEY_get0_key_id(skey);
BIO_printf(bio_out, "An opaque key identified by %s is created\n",
key_name ? key_name : "<unknown>");
BIO_printf(bio_out, "Provider: %s\n", EVP_SKEY_get0_provider_name(skey));
BIO_printf(bio_out, "Key management: %s\n", EVP_SKEY_get0_skeymgmt_name(skey));
ret = 0;
}
goto end;
} else {
BIO_printf(bio_err, "Key generation is the only supported operation as of now\n");
}
end:
ERR_print_errors(bio_err);
sk_OPENSSL_STRING_free(skeyopts);
EVP_SKEYMGMT_free(mgmt);
EVP_SKEY_free(skey);
EVP_CIPHER_free(cipher);
return ret;
}
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