apps/genpkey.c

   1 /*
   2  * Copyright 2006-2021 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 <stdio.h>
  11 #include <string.h>
  12 #include "apps.h"
  13 #include "progs.h"
  14 #include <openssl/pem.h>
  15 #include <openssl/err.h>
  16 #include <openssl/evp.h>
  17
  18 static int init_keygen_file(EVP_PKEY_CTX **pctx, const char *file, ENGINE *e,
  19                             OSSL_LIB_CTX *libctx, const char *propq);
  20 static int genpkey_cb(EVP_PKEY_CTX *ctx);
  21
  22 typedef enum OPTION_choice {
  23     OPT_COMMON,
  24     OPT_ENGINE, OPT_OUTFORM, OPT_OUT, OPT_PASS, OPT_PARAMFILE,
  25     OPT_ALGORITHM, OPT_PKEYOPT, OPT_GENPARAM, OPT_TEXT, OPT_CIPHER,
  26     OPT_CONFIG,
  27     OPT_PROV_ENUM
  28 } OPTION_CHOICE;
  29
  30 const OPTIONS genpkey_options[] = {
  31     OPT_SECTION("General"),
  32     {"help", OPT_HELP, '-', "Display this summary"},
  33 #ifndef OPENSSL_NO_ENGINE
  34     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  35 #endif
  36     {"paramfile", OPT_PARAMFILE, '<', "Parameters file"},
  37     {"algorithm", OPT_ALGORITHM, 's', "The public key algorithm"},
  38     {"pkeyopt", OPT_PKEYOPT, 's',
  39      "Set the public key algorithm option as opt:value"},
  40      OPT_CONFIG_OPTION,
  41
  42     OPT_SECTION("Output"),
  43     {"out", OPT_OUT, '>', "Output file"},
  44     {"outform", OPT_OUTFORM, 'F', "output format (DER or PEM)"},
  45     {"pass", OPT_PASS, 's', "Output file pass phrase source"},
  46     {"genparam", OPT_GENPARAM, '-', "Generate parameters, not key"},
  47     {"text", OPT_TEXT, '-', "Print the in text"},
  48     {"", OPT_CIPHER, '-', "Cipher to use to encrypt the key"},
  49
  50     OPT_PROV_OPTIONS,
  51
  52     /* This is deliberately last. */
  53     {OPT_HELP_STR, 1, 1,
  54      "Order of options may be important!  See the documentation.\n"},
  55     {NULL}
  56 };
  57
  58 int genpkey_main(int argc, char **argv)
  59 {
  60     CONF *conf = NULL;
  61     BIO *in = NULL, *out = NULL;
  62     ENGINE *e = NULL;
  63     EVP_PKEY *pkey = NULL;
  64     EVP_PKEY_CTX *ctx = NULL;
  65     char *outfile = NULL, *passarg = NULL, *pass = NULL, *prog, *p;
  66     const char *ciphername = NULL, *paramfile = NULL, *algname = NULL;
  67     EVP_CIPHER *cipher = NULL;
  68     OPTION_CHOICE o;
  69     int outformat = FORMAT_PEM, text = 0, ret = 1, rv, do_param = 0;
  70     int private = 0, i, m;
  71     OSSL_LIB_CTX *libctx = app_get0_libctx();
  72     STACK_OF(OPENSSL_STRING) *keyopt = NULL;
  73
  74     prog = opt_init(argc, argv, genpkey_options);
  75     keyopt = sk_OPENSSL_STRING_new_null();
  76     if (keyopt == NULL)
  77         goto end;
  78     while ((o = opt_next()) != OPT_EOF) {
  79         switch (o) {
  80         case OPT_EOF:
  81         case OPT_ERR:
  82  opthelp:
  83             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  84             goto end;
  85         case OPT_HELP:
  86             ret = 0;
  87             opt_help(genpkey_options);
  88             goto end;
  89         case OPT_OUTFORM:
  90             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
  91                 goto opthelp;
  92             break;
  93         case OPT_OUT:
  94             outfile = opt_arg();
  95             break;
  96         case OPT_PASS:
  97             passarg = opt_arg();
  98             break;
  99         case OPT_ENGINE:
 100             e = setup_engine(opt_arg(), 0);
 101             break;
 102         case OPT_PARAMFILE:
 103             if (do_param == 1)
 104                 goto opthelp;
 105             paramfile = opt_arg();
 106             break;
 107         case OPT_ALGORITHM:
 108             algname = opt_arg();
 109             break;
 110         case OPT_PKEYOPT:
 111             if (!sk_OPENSSL_STRING_push(keyopt, opt_arg()))
 112                 goto end;
 113             break;
 114         case OPT_GENPARAM:
 115             do_param = 1;
 116             break;
 117         case OPT_TEXT:
 118             text = 1;
 119             break;
 120         case OPT_CIPHER:
 121             ciphername = opt_unknown();
 122             break;
 123         case OPT_CONFIG:
 124             conf = app_load_config_modules(opt_arg());
 125             if (conf == NULL)
 126                 goto end;
 127             break;
 128         case OPT_PROV_CASES:
 129             if (!opt_provider(o))
 130                 goto end;
 131             break;
 132         }
 133     }
 134
 135     /* No extra arguments. */
 136     argc = opt_num_rest();
 137     if (argc != 0)
 138         goto opthelp;
 139
 140     /* Fetch cipher, etc. */
 141     if (paramfile != NULL) {
 142         if (!init_keygen_file(&ctx, paramfile, e, libctx, app_get0_propq()))
 143             goto end;
 144     }
 145     if (algname != NULL) {
 146         if (!init_gen_str(&ctx, algname, e, do_param, libctx, app_get0_propq()))
 147             goto end;
 148     }
 149     if (ctx == NULL)
 150         goto opthelp;
 151
 152     for (i = 0; i < sk_OPENSSL_STRING_num(keyopt); i++) {
 153         p = sk_OPENSSL_STRING_value(keyopt, i);
 154         if (pkey_ctrl_string(ctx, p) <= 0) {
 155             BIO_printf(bio_err, "%s: Error setting %s parameter:\n", prog, p);
 156             ERR_print_errors(bio_err);
 157             goto end;
 158         }
 159     }
 160     if (ciphername != NULL) {
 161         if (!opt_cipher(ciphername, &cipher) || do_param == 1)
 162             goto opthelp;
 163         m = EVP_CIPHER_mode(cipher);
 164         if (m == EVP_CIPH_GCM_MODE || m == EVP_CIPH_CCM_MODE
 165                 || m == EVP_CIPH_XTS_MODE || m == EVP_CIPH_OCB_MODE) {
 166             BIO_printf(bio_err, "%s: cipher mode not supported\n", prog);
 167             goto end;
 168         }
 169     }
 170
 171     private = do_param ? 0 : 1;
 172
 173     if (!app_passwd(passarg, NULL, &pass, NULL)) {
 174         BIO_puts(bio_err, "Error getting password\n");
 175         goto end;
 176     }
 177
 178     out = bio_open_owner(outfile, outformat, private);
 179     if (out == NULL)
 180         goto end;
 181
 182     EVP_PKEY_CTX_set_cb(ctx, genpkey_cb);
 183     EVP_PKEY_CTX_set_app_data(ctx, bio_err);
 184
 185     if (do_param) {
 186         if (EVP_PKEY_paramgen(ctx, &pkey) <= 0) {
 187             BIO_puts(bio_err, "Error generating parameters\n");
 188             ERR_print_errors(bio_err);
 189             goto end;
 190         }
 191     } else {
 192         if (EVP_PKEY_keygen(ctx, &pkey) <= 0) {
 193             BIO_puts(bio_err, "Error generating key\n");
 194             ERR_print_errors(bio_err);
 195             goto end;
 196         }
 197     }
 198
 199     if (do_param) {
 200         rv = PEM_write_bio_Parameters(out, pkey);
 201     } else if (outformat == FORMAT_PEM) {
 202         assert(private);
 203         rv = PEM_write_bio_PrivateKey(out, pkey, cipher, NULL, 0, NULL, pass);
 204     } else if (outformat == FORMAT_ASN1) {
 205         assert(private);
 206         rv = i2d_PrivateKey_bio(out, pkey);
 207     } else {
 208         BIO_printf(bio_err, "Bad format specified for key\n");
 209         goto end;
 210     }
 211
 212     ret = 0;
 213
 214     if (rv <= 0) {
 215         BIO_puts(bio_err, "Error writing key\n");
 216         ERR_print_errors(bio_err);
 217         ret = 1;
 218     }
 219
 220     if (text) {
 221         if (do_param)
 222             rv = EVP_PKEY_print_params(out, pkey, 0, NULL);
 223         else
 224             rv = EVP_PKEY_print_private(out, pkey, 0, NULL);
 225
 226         if (rv <= 0) {
 227             BIO_puts(bio_err, "Error printing key\n");
 228             ERR_print_errors(bio_err);
 229             ret = 1;
 230         }
 231     }
 232
 233  end:
 234     sk_OPENSSL_STRING_free(keyopt);
 235     EVP_PKEY_free(pkey);
 236     EVP_PKEY_CTX_free(ctx);
 237     EVP_CIPHER_free(cipher);
 238     BIO_free_all(out);
 239     BIO_free(in);
 240     release_engine(e);
 241     OPENSSL_free(pass);
 242     NCONF_free(conf);
 243     return ret;
 244 }
 245
 246 static int init_keygen_file(EVP_PKEY_CTX **pctx, const char *file, ENGINE *e,
 247                             OSSL_LIB_CTX *libctx, const char *propq)
 248 {
 249     BIO *pbio;
 250     EVP_PKEY *pkey = NULL;
 251     EVP_PKEY_CTX *ctx = NULL;
 252     if (*pctx) {
 253         BIO_puts(bio_err, "Parameters already set!\n");
 254         return 0;
 255     }
 256
 257     pbio = BIO_new_file(file, "r");
 258     if (pbio == NULL) {
 259         BIO_printf(bio_err, "Can't open parameter file %s\n", file);
 260         return 0;
 261     }
 262
 263     pkey = PEM_read_bio_Parameters_ex(pbio, NULL, libctx, propq);
 264     BIO_free(pbio);
 265
 266     if (pkey == NULL) {
 267         BIO_printf(bio_err, "Error reading parameter file %s\n", file);
 268         return 0;
 269     }
 270
 271     if (e != NULL)
 272         ctx = EVP_PKEY_CTX_new(pkey, e);
 273     else
 274         ctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);
 275     if (ctx == NULL)
 276         goto err;
 277     if (EVP_PKEY_keygen_init(ctx) <= 0)
 278         goto err;
 279     EVP_PKEY_free(pkey);
 280     *pctx = ctx;
 281     return 1;
 282
 283  err:
 284     BIO_puts(bio_err, "Error initializing context\n");
 285     ERR_print_errors(bio_err);
 286     EVP_PKEY_CTX_free(ctx);
 287     EVP_PKEY_free(pkey);
 288     return 0;
 289
 290 }
 291
 292 int init_gen_str(EVP_PKEY_CTX **pctx,
 293                  const char *algname, ENGINE *e, int do_param,
 294                  OSSL_LIB_CTX *libctx, const char *propq)
 295 {
 296     EVP_PKEY_CTX *ctx = NULL;
 297     int pkey_id;
 298
 299     if (*pctx) {
 300         BIO_puts(bio_err, "Algorithm already set!\n");
 301         return 0;
 302     }
 303
 304     pkey_id = get_legacy_pkey_id(libctx, algname, e);
 305     if (pkey_id != NID_undef)
 306         ctx = EVP_PKEY_CTX_new_id(pkey_id, e);
 307     else
 308         ctx = EVP_PKEY_CTX_new_from_name(libctx, algname, propq);
 309
 310     if (ctx == NULL)
 311         goto err;
 312     if (do_param) {
 313         if (EVP_PKEY_paramgen_init(ctx) <= 0)
 314             goto err;
 315     } else {
 316         if (EVP_PKEY_keygen_init(ctx) <= 0)
 317             goto err;
 318     }
 319
 320     *pctx = ctx;
 321     return 1;
 322
 323  err:
 324     BIO_printf(bio_err, "Error initializing %s context\n", algname);
 325     ERR_print_errors(bio_err);
 326     EVP_PKEY_CTX_free(ctx);
 327     return 0;
 328
 329 }
 330
 331 static int genpkey_cb(EVP_PKEY_CTX *ctx)
 332 {
 333     char c = '*';
 334     BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
 335     int p;
 336     p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
 337     if (p == 0)
 338         c = '.';
 339     if (p == 1)
 340         c = '+';
 341     if (p == 2)
 342         c = '*';
 343     if (p == 3)
 344         c = '\n';
 345     BIO_write(b, &c, 1);
 346     (void)BIO_flush(b);
 347     return 1;
 348 }