1 /* 2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 <openssl/opensslconf.h> 11 #ifdef OPENSSL_NO_DSA 12 NON_EMPTY_TRANSLATION_UNIT 13 #else 14 15 # include <stdio.h> 16 # include <string.h> 17 # include <sys/types.h> 18 # include <sys/stat.h> 19 # include "apps.h" 20 # include "progs.h" 21 # include <openssl/bio.h> 22 # include <openssl/err.h> 23 # include <openssl/bn.h> 24 # include <openssl/dsa.h> 25 # include <openssl/x509.h> 26 # include <openssl/pem.h> 27 28 typedef enum OPTION_choice { 29 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, 30 OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, 31 OPT_R_ENUM 32 } OPTION_CHOICE; 33 34 const OPTIONS gendsa_options[] = { 35 {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"}, 36 {OPT_HELP_STR, 1, '-', "Valid options are:\n"}, 37 {"help", OPT_HELP, '-', "Display this summary"}, 38 {"out", OPT_OUT, '>', "Output the key to the specified file"}, 39 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"}, 40 OPT_R_OPTIONS, 41 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"}, 42 # ifndef OPENSSL_NO_ENGINE 43 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"}, 44 # endif 45 {NULL} 46 }; 47 48 int gendsa_main(int argc, char **argv) 49 { 50 ENGINE *e = NULL; 51 BIO *out = NULL, *in = NULL; 52 DSA *dsa = NULL; 53 const EVP_CIPHER *enc = NULL; 54 char *dsaparams = NULL; 55 char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog; 56 OPTION_CHOICE o; 57 int ret = 1, private = 0; 58 const BIGNUM *p = NULL; 59 60 prog = opt_init(argc, argv, gendsa_options); 61 while ((o = opt_next()) != OPT_EOF) { 62 switch (o) { 63 case OPT_EOF: 64 case OPT_ERR: 65 opthelp: 66 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); 67 goto end; 68 case OPT_HELP: 69 ret = 0; 70 opt_help(gendsa_options); 71 goto end; 72 case OPT_OUT: 73 outfile = opt_arg(); 74 break; 75 case OPT_PASSOUT: 76 passoutarg = opt_arg(); 77 break; 78 case OPT_ENGINE: 79 e = setup_engine(opt_arg(), 0); 80 break; 81 case OPT_R_CASES: 82 if (!opt_rand(o)) 83 goto end; 84 break; 85 case OPT_CIPHER: 86 if (!opt_cipher(opt_unknown(), &enc)) 87 goto end; 88 break; 89 } 90 } 91 argc = opt_num_rest(); 92 argv = opt_rest(); 93 private = 1; 94 95 if (argc != 1) 96 goto opthelp; 97 dsaparams = *argv; 98 99 if (!app_passwd(NULL, passoutarg, NULL, &passout)) { 100 BIO_printf(bio_err, "Error getting password\n"); 101 goto end; 102 } 103 104 in = bio_open_default(dsaparams, 'r', FORMAT_PEM); 105 if (in == NULL) 106 goto end2; 107 108 if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) { 109 BIO_printf(bio_err, "unable to load DSA parameter file\n"); 110 goto end; 111 } 112 BIO_free(in); 113 in = NULL; 114 115 out = bio_open_owner(outfile, FORMAT_PEM, private); 116 if (out == NULL) 117 goto end2; 118 119 DSA_get0_pqg(dsa, &p, NULL, NULL); 120 121 if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS) 122 BIO_printf(bio_err, 123 "Warning: It is not recommended to use more than %d bit for DSA keys.\n" 124 " Your key size is %d! Larger key size may behave not as expected.\n", 125 OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p)); 126 127 BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p)); 128 if (!DSA_generate_key(dsa)) 129 goto end; 130 131 assert(private); 132 if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout)) 133 goto end; 134 ret = 0; 135 end: 136 if (ret != 0) 137 ERR_print_errors(bio_err); 138 end2: 139 BIO_free(in); 140 BIO_free_all(out); 141 DSA_free(dsa); 142 release_engine(e); 143 OPENSSL_free(passout); 144 return ret; 145 } 146 #endif 147