crypto/openssl/apps/kdf.c

   1 /*
   2  * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11
  12 #include "apps.h"
  13 #include "progs.h"
  14 #include <openssl/bio.h>
  15 #include <openssl/err.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/kdf.h>
  18 #include <openssl/params.h>
  19
  20 typedef enum OPTION_choice {
  21     OPT_COMMON,
  22     OPT_KDFOPT, OPT_BIN, OPT_KEYLEN, OPT_OUT,
  23     OPT_CIPHER, OPT_DIGEST, OPT_MAC,
  24     OPT_PROV_ENUM
  25 } OPTION_CHOICE;
  26
  27 const OPTIONS kdf_options[] = {
  28     {OPT_HELP_STR, 1, '-', "Usage: %s [options] kdf_name\n"},
  29
  30     OPT_SECTION("General"),
  31     {"help", OPT_HELP, '-', "Display this summary"},
  32     {"kdfopt", OPT_KDFOPT, 's', "KDF algorithm control parameters in n:v form"},
  33     {"cipher", OPT_CIPHER, 's', "Cipher"},
  34     {"digest", OPT_DIGEST, 's', "Digest"},
  35     {"mac", OPT_MAC, 's', "MAC"},
  36     {OPT_MORE_STR, 1, '-', "See 'Supported Controls' in the EVP_KDF_ docs\n"},
  37     {"keylen", OPT_KEYLEN, 's', "The size of the output derived key"},
  38
  39     OPT_SECTION("Output"),
  40     {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
  41     {"binary", OPT_BIN, '-',
  42         "Output in binary format (default is hexadecimal)"},
  43
  44     OPT_PROV_OPTIONS,
  45
  46     OPT_PARAMETERS(),
  47     {"kdf_name", 0, 0, "Name of the KDF algorithm"},
  48     {NULL}
  49 };
  50
  51 static char *alloc_kdf_algorithm_name(STACK_OF(OPENSSL_STRING) **optp,
  52                                       const char *name, const char *arg)
  53 {
  54     size_t len = strlen(name) + strlen(arg) + 2;
  55     char *res;
  56
  57     if (*optp == NULL)
  58         *optp = sk_OPENSSL_STRING_new_null();
  59     if (*optp == NULL)
  60         return NULL;
  61
  62     res = app_malloc(len, "algorithm name");
  63     BIO_snprintf(res, len, "%s:%s", name, arg);
  64     if (sk_OPENSSL_STRING_push(*optp, res))
  65         return res;
  66     OPENSSL_free(res);
  67     return NULL;
  68 }
  69
  70 int kdf_main(int argc, char **argv)
  71 {
  72     int ret = 1, out_bin = 0;
  73     OPTION_CHOICE o;
  74     STACK_OF(OPENSSL_STRING) *opts = NULL;
  75     char *prog, *hexout = NULL;
  76     const char *outfile = NULL;
  77     unsigned char *dkm_bytes = NULL;
  78     size_t dkm_len = 0;
  79     BIO *out = NULL;
  80     EVP_KDF *kdf = NULL;
  81     EVP_KDF_CTX *ctx = NULL;
  82     char *digest = NULL, *cipher = NULL, *mac = NULL;
  83
  84     prog = opt_init(argc, argv, kdf_options);
  85     while ((o = opt_next()) != OPT_EOF) {
  86         switch (o) {
  87         default:
  88 opthelp:
  89             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  90             goto err;
  91         case OPT_HELP:
  92             opt_help(kdf_options);
  93             ret = 0;
  94             goto err;
  95         case OPT_BIN:
  96             out_bin = 1;
  97             break;
  98         case OPT_KEYLEN:
  99             dkm_len = (size_t)atoi(opt_arg());
 100             break;
 101         case OPT_OUT:
 102             outfile = opt_arg();
 103             break;
 104         case OPT_KDFOPT:
 105             if (opts == NULL)
 106                 opts = sk_OPENSSL_STRING_new_null();
 107             if (opts == NULL || !sk_OPENSSL_STRING_push(opts, opt_arg()))
 108                 goto opthelp;
 109             break;
 110         case OPT_CIPHER:
 111             OPENSSL_free(cipher);
 112             cipher = alloc_kdf_algorithm_name(&opts, "cipher", opt_arg());
 113             if (cipher == NULL)
 114                 goto opthelp;
 115             break;
 116         case OPT_DIGEST:
 117             OPENSSL_free(digest);
 118             digest = alloc_kdf_algorithm_name(&opts, "digest", opt_arg());
 119             if (digest == NULL)
 120                 goto opthelp;
 121             break;
 122         case OPT_MAC:
 123             OPENSSL_free(mac);
 124             mac = alloc_kdf_algorithm_name(&opts, "mac", opt_arg());
 125             if (mac == NULL)
 126                 goto opthelp;
 127             break;
 128         case OPT_PROV_CASES:
 129             if (!opt_provider(o))
 130                 goto err;
 131             break;
 132         }
 133     }
 134
 135     /* One argument, the KDF name. */
 136     argc = opt_num_rest();
 137     argv = opt_rest();
 138     if (argc != 1)
 139         goto opthelp;
 140
 141     if ((kdf = EVP_KDF_fetch(app_get0_libctx(), argv[0],
 142                              app_get0_propq())) == NULL) {
 143         BIO_printf(bio_err, "Invalid KDF name %s\n", argv[0]);
 144         goto opthelp;
 145     }
 146
 147     ctx = EVP_KDF_CTX_new(kdf);
 148     if (ctx == NULL)
 149         goto err;
 150
 151     if (opts != NULL) {
 152         int ok = 1;
 153         OSSL_PARAM *params =
 154             app_params_new_from_opts(opts, EVP_KDF_settable_ctx_params(kdf));
 155
 156         if (params == NULL)
 157             goto err;
 158
 159         if (!EVP_KDF_CTX_set_params(ctx, params)) {
 160             BIO_printf(bio_err, "KDF parameter error\n");
 161             ERR_print_errors(bio_err);
 162             ok = 0;
 163         }
 164         app_params_free(params);
 165         if (!ok)
 166             goto err;
 167     }
 168
 169     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 170     if (out == NULL)
 171         goto err;
 172
 173     if (dkm_len <= 0) {
 174         BIO_printf(bio_err, "Invalid derived key length.\n");
 175         goto err;
 176     }
 177     dkm_bytes = app_malloc(dkm_len, "out buffer");
 178     if (dkm_bytes == NULL)
 179         goto err;
 180
 181     if (!EVP_KDF_derive(ctx, dkm_bytes, dkm_len, NULL)) {
 182         BIO_printf(bio_err, "EVP_KDF_derive failed\n");
 183         goto err;
 184     }
 185
 186     if (out_bin) {
 187         BIO_write(out, dkm_bytes, dkm_len);
 188     } else {
 189         hexout = OPENSSL_buf2hexstr(dkm_bytes, dkm_len);
 190         if (hexout == NULL) {
 191             BIO_printf(bio_err, "Memory allocation failure\n");
 192             goto err;
 193         }
 194         BIO_printf(out, "%s\n\n", hexout);
 195     }
 196
 197     ret = 0;
 198 err:
 199     if (ret != 0)
 200         ERR_print_errors(bio_err);
 201     OPENSSL_clear_free(dkm_bytes, dkm_len);
 202     sk_OPENSSL_STRING_free(opts);
 203     EVP_KDF_free(kdf);
 204     EVP_KDF_CTX_free(ctx);
 205     BIO_free(out);
 206     OPENSSL_free(hexout);
 207     OPENSSL_free(cipher);
 208     OPENSSL_free(digest);
 209     OPENSSL_free(mac);
 210     return ret;
 211 }