1 /* 2 * Copyright 1995-2020 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 #include <stdio.h> 12 #include <string.h> 13 #include <sys/types.h> 14 #include <sys/stat.h> 15 #include "apps.h" 16 #include "progs.h" 17 #include <openssl/bio.h> 18 #include <openssl/err.h> 19 #include <openssl/bn.h> 20 #include <openssl/dsa.h> 21 #include <openssl/x509.h> 22 #include <openssl/pem.h> 23 24 typedef enum OPTION_choice { 25 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, 26 OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, 27 OPT_R_ENUM 28 } OPTION_CHOICE; 29 30 const OPTIONS gendsa_options[] = { 31 {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"}, 32 {OPT_HELP_STR, 1, '-', "Valid options are:\n"}, 33 {"help", OPT_HELP, '-', "Display this summary"}, 34 {"out", OPT_OUT, '>', "Output the key to the specified file"}, 35 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"}, 36 OPT_R_OPTIONS, 37 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"}, 38 #ifndef OPENSSL_NO_ENGINE 39 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"}, 40 #endif 41 {NULL} 42 }; 43 44 int gendsa_main(int argc, char **argv) 45 { 46 ENGINE *e = NULL; 47 BIO *out = NULL, *in = NULL; 48 DSA *dsa = NULL; 49 const EVP_CIPHER *enc = NULL; 50 char *dsaparams = NULL; 51 char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog; 52 OPTION_CHOICE o; 53 int ret = 1, private = 0; 54 const BIGNUM *p = NULL; 55 56 prog = opt_init(argc, argv, gendsa_options); 57 while ((o = opt_next()) != OPT_EOF) { 58 switch (o) { 59 case OPT_EOF: 60 case OPT_ERR: 61 opthelp: 62 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); 63 goto end; 64 case OPT_HELP: 65 ret = 0; 66 opt_help(gendsa_options); 67 goto end; 68 case OPT_OUT: 69 outfile = opt_arg(); 70 break; 71 case OPT_PASSOUT: 72 passoutarg = opt_arg(); 73 break; 74 case OPT_ENGINE: 75 e = setup_engine(opt_arg(), 0); 76 break; 77 case OPT_R_CASES: 78 if (!opt_rand(o)) 79 goto end; 80 break; 81 case OPT_CIPHER: 82 if (!opt_cipher(opt_unknown(), &enc)) 83 goto end; 84 break; 85 } 86 } 87 argc = opt_num_rest(); 88 argv = opt_rest(); 89 private = 1; 90 91 if (argc != 1) 92 goto opthelp; 93 dsaparams = *argv; 94 95 if (!app_passwd(NULL, passoutarg, NULL, &passout)) { 96 BIO_printf(bio_err, "Error getting password\n"); 97 goto end; 98 } 99 100 in = bio_open_default(dsaparams, 'r', FORMAT_PEM); 101 if (in == NULL) 102 goto end2; 103 104 if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) { 105 BIO_printf(bio_err, "unable to load DSA parameter file\n"); 106 goto end; 107 } 108 BIO_free(in); 109 in = NULL; 110 111 out = bio_open_owner(outfile, FORMAT_PEM, private); 112 if (out == NULL) 113 goto end2; 114 115 DSA_get0_pqg(dsa, &p, NULL, NULL); 116 117 if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS) 118 BIO_printf(bio_err, 119 "Warning: It is not recommended to use more than %d bit for DSA keys.\n" 120 " Your key size is %d! Larger key size may behave not as expected.\n", 121 OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p)); 122 123 BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p)); 124 if (!DSA_generate_key(dsa)) 125 goto end; 126 127 assert(private); 128 if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout)) 129 goto end; 130 ret = 0; 131 end: 132 if (ret != 0) 133 ERR_print_errors(bio_err); 134 end2: 135 BIO_free(in); 136 BIO_free_all(out); 137 DSA_free(dsa); 138 release_engine(e); 139 OPENSSL_free(passout); 140 return ret; 141 } 142