1 /* $OpenBSD: rsa.c,v 1.20 2025/01/02 12:31:44 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <openssl/opensslconf.h> 60 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <time.h> 65 66 #include "apps.h" 67 68 #include <openssl/bio.h> 69 #include <openssl/bn.h> 70 #include <openssl/err.h> 71 #include <openssl/evp.h> 72 #include <openssl/pem.h> 73 #include <openssl/rsa.h> 74 #include <openssl/x509.h> 75 76 static struct { 77 int check; 78 const EVP_CIPHER *enc; 79 char *infile; 80 int informat; 81 int modulus; 82 int noout; 83 char *outfile; 84 int outformat; 85 char *passargin; 86 char *passargout; 87 int pubin; 88 int pubout; 89 int pvk_encr; 90 int text; 91 } cfg; 92 93 static int 94 rsa_opt_cipher(int argc, char **argv, int *argsused) 95 { 96 char *name = argv[0]; 97 98 if (*name++ != '-') 99 return (1); 100 101 if ((cfg.enc = EVP_get_cipherbyname(name)) == NULL) { 102 fprintf(stderr, "Invalid cipher '%s'\n", name); 103 return (1); 104 } 105 106 *argsused = 1; 107 return (0); 108 } 109 110 static const struct option rsa_options[] = { 111 { 112 .name = "check", 113 .desc = "Check consistency of RSA private key", 114 .type = OPTION_FLAG, 115 .opt.flag = &cfg.check, 116 }, 117 { 118 .name = "in", 119 .argname = "file", 120 .desc = "Input file (default stdin)", 121 .type = OPTION_ARG, 122 .opt.arg = &cfg.infile, 123 }, 124 { 125 .name = "inform", 126 .argname = "format", 127 .desc = "Input format (DER, NET or PEM (default))", 128 .type = OPTION_ARG_FORMAT, 129 .opt.value = &cfg.informat, 130 }, 131 { 132 .name = "modulus", 133 .desc = "Print the RSA key modulus", 134 .type = OPTION_FLAG, 135 .opt.flag = &cfg.modulus, 136 }, 137 { 138 .name = "noout", 139 .desc = "Do not print encoded version of the key", 140 .type = OPTION_FLAG, 141 .opt.flag = &cfg.noout, 142 }, 143 { 144 .name = "out", 145 .argname = "file", 146 .desc = "Output file (default stdout)", 147 .type = OPTION_ARG, 148 .opt.arg = &cfg.outfile, 149 }, 150 { 151 .name = "outform", 152 .argname = "format", 153 .desc = "Output format (DER, NET or PEM (default PEM))", 154 .type = OPTION_ARG_FORMAT, 155 .opt.value = &cfg.outformat, 156 }, 157 { 158 .name = "passin", 159 .argname = "src", 160 .desc = "Input file passphrase source", 161 .type = OPTION_ARG, 162 .opt.arg = &cfg.passargin, 163 }, 164 { 165 .name = "passout", 166 .argname = "src", 167 .desc = "Output file passphrase source", 168 .type = OPTION_ARG, 169 .opt.arg = &cfg.passargout, 170 }, 171 { 172 .name = "pubin", 173 .desc = "Expect a public key (default private key)", 174 .type = OPTION_VALUE, 175 .value = 1, 176 .opt.value = &cfg.pubin, 177 }, 178 { 179 .name = "pubout", 180 .desc = "Output a public key (default private key)", 181 .type = OPTION_VALUE, 182 .value = 1, 183 .opt.value = &cfg.pubout, 184 }, 185 { 186 .name = "pvk-none", 187 .type = OPTION_VALUE, 188 .value = 0, 189 .opt.value = &cfg.pvk_encr, 190 }, 191 { 192 .name = "pvk-strong", 193 .type = OPTION_VALUE, 194 .value = 2, 195 .opt.value = &cfg.pvk_encr, 196 }, 197 { 198 .name = "pvk-weak", 199 .type = OPTION_VALUE, 200 .value = 1, 201 .opt.value = &cfg.pvk_encr, 202 }, 203 { 204 .name = "RSAPublicKey_in", 205 .type = OPTION_VALUE, 206 .value = 2, 207 .opt.value = &cfg.pubin, 208 }, 209 { 210 .name = "RSAPublicKey_out", 211 .type = OPTION_VALUE, 212 .value = 2, 213 .opt.value = &cfg.pubout, 214 }, 215 { 216 .name = "text", 217 .desc = "Print in plain text in addition to encoded", 218 .type = OPTION_FLAG, 219 .opt.flag = &cfg.text, 220 }, 221 { 222 .name = NULL, 223 .type = OPTION_ARGV_FUNC, 224 .opt.argvfunc = rsa_opt_cipher, 225 }, 226 { NULL } 227 }; 228 229 static void 230 rsa_usage(void) 231 { 232 int n = 0; 233 234 fprintf(stderr, 235 "usage: rsa [-ciphername] [-check] [-in file] " 236 "[-inform fmt]\n" 237 " [-modulus] [-noout] [-out file] [-outform fmt] " 238 "[-passin src]\n" 239 " [-passout src] [-pubin] [-pubout] [-text]\n\n"); 240 options_usage(rsa_options); 241 fprintf(stderr, "\n"); 242 243 fprintf(stderr, "Valid ciphername values:\n\n"); 244 OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, show_cipher, &n); 245 fprintf(stderr, "\n"); 246 } 247 248 int 249 rsa_main(int argc, char **argv) 250 { 251 int ret = 1; 252 RSA *rsa = NULL; 253 int i; 254 BIO *out = NULL; 255 char *passin = NULL, *passout = NULL; 256 257 if (pledge("stdio cpath wpath rpath tty", NULL) == -1) { 258 perror("pledge"); 259 exit(1); 260 } 261 262 memset(&cfg, 0, sizeof(cfg)); 263 cfg.pvk_encr = 2; 264 cfg.informat = FORMAT_PEM; 265 cfg.outformat = FORMAT_PEM; 266 267 if (options_parse(argc, argv, rsa_options, NULL, NULL) != 0) { 268 rsa_usage(); 269 goto end; 270 } 271 272 if (!app_passwd(bio_err, cfg.passargin, cfg.passargout, 273 &passin, &passout)) { 274 BIO_printf(bio_err, "Error getting passwords\n"); 275 goto end; 276 } 277 if (cfg.check && cfg.pubin) { 278 BIO_printf(bio_err, "Only private keys can be checked\n"); 279 goto end; 280 } 281 out = BIO_new(BIO_s_file()); 282 283 { 284 EVP_PKEY *pkey; 285 286 if (cfg.pubin) { 287 int tmpformat = -1; 288 if (cfg.pubin == 2) { 289 if (cfg.informat == FORMAT_PEM) 290 tmpformat = FORMAT_PEMRSA; 291 else if (cfg.informat == FORMAT_ASN1) 292 tmpformat = FORMAT_ASN1RSA; 293 } else 294 tmpformat = cfg.informat; 295 296 pkey = load_pubkey(bio_err, cfg.infile, 297 tmpformat, 1, passin, "Public Key"); 298 } else 299 pkey = load_key(bio_err, cfg.infile, 300 cfg.informat, 1, passin, "Private Key"); 301 302 if (pkey != NULL) 303 rsa = EVP_PKEY_get1_RSA(pkey); 304 EVP_PKEY_free(pkey); 305 } 306 307 if (rsa == NULL) { 308 ERR_print_errors(bio_err); 309 goto end; 310 } 311 if (cfg.outfile == NULL) { 312 BIO_set_fp(out, stdout, BIO_NOCLOSE); 313 } else { 314 if (BIO_write_filename(out, cfg.outfile) <= 0) { 315 perror(cfg.outfile); 316 goto end; 317 } 318 } 319 320 if (cfg.text) 321 if (!RSA_print(out, rsa, 0)) { 322 perror(cfg.outfile); 323 ERR_print_errors(bio_err); 324 goto end; 325 } 326 if (cfg.modulus) { 327 BIO_printf(out, "Modulus="); 328 BN_print(out, RSA_get0_n(rsa)); 329 BIO_printf(out, "\n"); 330 } 331 if (cfg.check) { 332 int r = RSA_check_key(rsa); 333 334 if (r == 1) 335 BIO_printf(out, "RSA key ok\n"); 336 else if (r == 0) { 337 unsigned long err; 338 339 while ((err = ERR_peek_error()) != 0 && 340 ERR_GET_LIB(err) == ERR_LIB_RSA && 341 ERR_GET_FUNC(err) == RSA_F_RSA_CHECK_KEY && 342 ERR_GET_REASON(err) != ERR_R_MALLOC_FAILURE) { 343 BIO_printf(out, "RSA key error: %s\n", 344 ERR_reason_error_string(err)); 345 ERR_get_error(); /* remove e from error 346 * stack */ 347 } 348 } 349 if (r == -1 || ERR_peek_error() != 0) { /* should happen only if 350 * r == -1 */ 351 ERR_print_errors(bio_err); 352 goto end; 353 } 354 } 355 if (cfg.noout) { 356 ret = 0; 357 goto end; 358 } 359 BIO_printf(bio_err, "writing RSA key\n"); 360 if (cfg.outformat == FORMAT_ASN1) { 361 if (cfg.pubout || cfg.pubin) { 362 if (cfg.pubout == 2) 363 i = i2d_RSAPublicKey_bio(out, rsa); 364 else 365 i = i2d_RSA_PUBKEY_bio(out, rsa); 366 } else 367 i = i2d_RSAPrivateKey_bio(out, rsa); 368 } else if (cfg.outformat == FORMAT_PEM) { 369 if (cfg.pubout || cfg.pubin) { 370 if (cfg.pubout == 2) 371 i = PEM_write_bio_RSAPublicKey(out, rsa); 372 else 373 i = PEM_write_bio_RSA_PUBKEY(out, rsa); 374 } else 375 i = PEM_write_bio_RSAPrivateKey(out, rsa, 376 cfg.enc, NULL, 0, NULL, passout); 377 #if !defined(OPENSSL_NO_DSA) && !defined(OPENSSL_NO_RC4) 378 } else if (cfg.outformat == FORMAT_MSBLOB || 379 cfg.outformat == FORMAT_PVK) { 380 EVP_PKEY *pk; 381 pk = EVP_PKEY_new(); 382 EVP_PKEY_set1_RSA(pk, rsa); 383 if (cfg.outformat == FORMAT_PVK) 384 i = i2b_PVK_bio(out, pk, cfg.pvk_encr, 0, 385 passout); 386 else if (cfg.pubin || cfg.pubout) 387 i = i2b_PublicKey_bio(out, pk); 388 else 389 i = i2b_PrivateKey_bio(out, pk); 390 EVP_PKEY_free(pk); 391 #endif 392 } else { 393 BIO_printf(bio_err, 394 "bad output format specified for outfile\n"); 395 goto end; 396 } 397 if (i <= 0) { 398 BIO_printf(bio_err, "unable to write key\n"); 399 ERR_print_errors(bio_err); 400 } else 401 ret = 0; 402 403 end: 404 BIO_free_all(out); 405 RSA_free(rsa); 406 free(passin); 407 free(passout); 408 409 return (ret); 410 } 411