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/*
* Copyright 2019-2025 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 <string.h>
#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include <openssl/params.h>
typedef enum OPTION_choice {
OPT_COMMON,
OPT_KDFOPT, OPT_BIN, OPT_KEYLEN, OPT_OUT,
OPT_CIPHER, OPT_DIGEST, OPT_MAC,
OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS kdf_options[] = {
{OPT_HELP_STR, 1, '-', "Usage: %s [options] kdf_name\n"},
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
{"kdfopt", OPT_KDFOPT, 's', "KDF algorithm control parameters in n:v form"},
{"cipher", OPT_CIPHER, 's', "Cipher"},
{"digest", OPT_DIGEST, 's', "Digest"},
{"mac", OPT_MAC, 's', "MAC"},
{OPT_MORE_STR, 1, '-', "See 'Supported Controls' in the EVP_KDF_ docs\n"},
{"keylen", OPT_KEYLEN, 's', "The size of the output derived key"},
OPT_SECTION("Output"),
{"out", OPT_OUT, '>', "Output to filename rather than stdout"},
{"binary", OPT_BIN, '-',
"Output in binary format (default is hexadecimal)"},
OPT_PROV_OPTIONS,
OPT_PARAMETERS(),
{"kdf_name", 0, 0, "Name of the KDF algorithm"},
{NULL}
};
static char *alloc_kdf_algorithm_name(STACK_OF(OPENSSL_STRING) **optp,
const char *name, const char *arg)
{
size_t len = strlen(name) + strlen(arg) + 2;
char *res;
if (*optp == NULL)
*optp = sk_OPENSSL_STRING_new_null();
if (*optp == NULL)
return NULL;
res = app_malloc(len, "algorithm name");
BIO_snprintf(res, len, "%s:%s", name, arg);
if (sk_OPENSSL_STRING_push(*optp, res))
return res;
OPENSSL_free(res);
return NULL;
}
int kdf_main(int argc, char **argv)
{
int ret = 1, out_bin = 0;
OPTION_CHOICE o;
STACK_OF(OPENSSL_STRING) *opts = NULL;
char *prog, *hexout = NULL;
const char *outfile = NULL;
unsigned char *dkm_bytes = NULL;
int dkm_len = 0;
BIO *out = NULL;
EVP_KDF *kdf = NULL;
EVP_KDF_CTX *ctx = NULL;
char *digest = NULL, *cipher = NULL, *mac = NULL;
prog = opt_init(argc, argv, kdf_options);
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
default:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto err;
case OPT_HELP:
opt_help(kdf_options);
ret = 0;
goto err;
case OPT_BIN:
out_bin = 1;
break;
case OPT_KEYLEN:
dkm_len = atoi(opt_arg());
break;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_KDFOPT:
if (opts == NULL)
opts = sk_OPENSSL_STRING_new_null();
if (opts == NULL || !sk_OPENSSL_STRING_push(opts, opt_arg()))
goto opthelp;
break;
case OPT_CIPHER:
OPENSSL_free(cipher);
cipher = alloc_kdf_algorithm_name(&opts, "cipher", opt_arg());
if (cipher == NULL)
goto opthelp;
break;
case OPT_DIGEST:
OPENSSL_free(digest);
digest = alloc_kdf_algorithm_name(&opts, "digest", opt_arg());
if (digest == NULL)
goto opthelp;
break;
case OPT_MAC:
OPENSSL_free(mac);
mac = alloc_kdf_algorithm_name(&opts, "mac", opt_arg());
if (mac == NULL)
goto opthelp;
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto err;
break;
}
}
/* One argument, the KDF name. */
argc = opt_num_rest();
argv = opt_rest();
if (argc != 1)
goto opthelp;
if ((kdf = EVP_KDF_fetch(app_get0_libctx(), argv[0],
app_get0_propq())) == NULL) {
BIO_printf(bio_err, "Invalid KDF name %s\n", argv[0]);
goto opthelp;
}
ctx = EVP_KDF_CTX_new(kdf);
if (ctx == NULL)
goto err;
if (opts != NULL) {
int ok = 1;
OSSL_PARAM *params =
app_params_new_from_opts(opts, EVP_KDF_settable_ctx_params(kdf));
if (params == NULL)
goto err;
if (!EVP_KDF_CTX_set_params(ctx, params)) {
BIO_printf(bio_err, "KDF parameter error\n");
ERR_print_errors(bio_err);
ok = 0;
}
app_params_free(params);
if (!ok)
goto err;
}
out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
if (out == NULL)
goto err;
if (dkm_len <= 0) {
BIO_printf(bio_err, "Invalid derived key length.\n");
goto err;
}
dkm_bytes = app_malloc(dkm_len, "out buffer");
if (dkm_bytes == NULL)
goto err;
if (!EVP_KDF_derive(ctx, dkm_bytes, dkm_len, NULL)) {
BIO_printf(bio_err, "EVP_KDF_derive failed\n");
goto err;
}
if (out_bin) {
BIO_write(out, dkm_bytes, dkm_len);
} else {
hexout = OPENSSL_buf2hexstr(dkm_bytes, dkm_len);
if (hexout == NULL) {
BIO_printf(bio_err, "Memory allocation failure\n");
goto err;
}
BIO_printf(out, "%s\n\n", hexout);
}
ret = 0;
err:
if (ret != 0)
ERR_print_errors(bio_err);
OPENSSL_clear_free(dkm_bytes, dkm_len);
sk_OPENSSL_STRING_free(opts);
EVP_KDF_free(kdf);
EVP_KDF_CTX_free(ctx);
BIO_free(out);
OPENSSL_free(hexout);
OPENSSL_free(cipher);
OPENSSL_free(digest);
OPENSSL_free(mac);
return ret;
}
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