| 1 | /*
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| 2 | * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/opensslconf.h>
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include <stdlib.h>
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| 14 | #include <time.h>
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| 15 | #include <string.h>
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| 16 | #include "apps.h"
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| 17 | #include "progs.h"
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| 18 | #include <openssl/bio.h>
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| 19 | #include <openssl/err.h>
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| 20 | #include <openssl/bn.h>
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| 21 | #include <openssl/dsa.h>
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| 22 | #include <openssl/dh.h>
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| 23 | #include <openssl/x509.h>
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| 24 | #include <openssl/pem.h>
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| 25 | #include <openssl/core_names.h>
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| 26 | #include <openssl/core_dispatch.h>
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| 27 | #include <openssl/param_build.h>
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| 28 | #include <openssl/encoder.h>
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| 29 | #include <openssl/decoder.h>
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| 30 |
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| 31 | #define DEFBITS 2048
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| 32 |
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| 33 | static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh);
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| 34 |
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| 35 | static int verbose = 1;
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| 36 |
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| 37 | typedef enum OPTION_choice {
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| 38 | OPT_COMMON,
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| 39 | OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,
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| 40 | OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT,
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| 41 | OPT_DSAPARAM, OPT_2, OPT_3, OPT_5, OPT_VERBOSE, OPT_QUIET,
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| 42 | OPT_R_ENUM, OPT_PROV_ENUM
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| 43 | } OPTION_CHOICE;
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| 44 |
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| 45 | const OPTIONS dhparam_options[] = {
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| 46 | {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
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| 47 |
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| 48 | OPT_SECTION("General"),
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| 49 | {"help", OPT_HELP, '-', "Display this summary"},
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| 50 | {"check", OPT_CHECK, '-', "Check the DH parameters"},
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| 51 | #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_DEPRECATED_3_0)
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| 52 | {"dsaparam", OPT_DSAPARAM, '-',
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| 53 | "Read or generate DSA parameters, convert to DH"},
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| 54 | #endif
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| 55 | #ifndef OPENSSL_NO_ENGINE
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| 56 | {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
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| 57 | #endif
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| 58 |
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| 59 | OPT_SECTION("Input"),
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| 60 | {"in", OPT_IN, '<', "Input file"},
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| 61 | {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"},
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| 62 |
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| 63 | OPT_SECTION("Output"),
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| 64 | {"out", OPT_OUT, '>', "Output file"},
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| 65 | {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"},
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| 66 | {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"},
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| 67 | {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"},
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| 68 | {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"},
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| 69 | {"3", OPT_3, '-', "Generate parameters using 3 as the generator value"},
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| 70 | {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"},
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| 71 | {"verbose", OPT_VERBOSE, '-', "Verbose output"},
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| 72 | {"quiet", OPT_QUIET, '-', "Terse output"},
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| 73 |
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| 74 | OPT_R_OPTIONS,
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| 75 | OPT_PROV_OPTIONS,
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| 76 |
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| 77 | OPT_PARAMETERS(),
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| 78 | {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
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| 79 | {NULL}
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| 80 | };
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| 81 |
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| 82 | int dhparam_main(int argc, char **argv)
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| 83 | {
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| 84 | BIO *in = NULL, *out = NULL;
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| 85 | EVP_PKEY *pkey = NULL, *tmppkey = NULL;
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| 86 | EVP_PKEY_CTX *ctx = NULL;
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| 87 | char *infile = NULL, *outfile = NULL, *prog;
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| 88 | ENGINE *e = NULL;
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| 89 | int dsaparam = 0;
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| 90 | int text = 0, ret = 1, num = 0, g = 0;
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| 91 | int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0;
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| 92 | OPTION_CHOICE o;
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| 93 |
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| 94 | prog = opt_init(argc, argv, dhparam_options);
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| 95 | while ((o = opt_next()) != OPT_EOF) {
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| 96 | switch (o) {
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| 97 | case OPT_EOF:
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| 98 | case OPT_ERR:
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| 99 | opthelp:
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| 100 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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| 101 | goto end;
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| 102 | case OPT_HELP:
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| 103 | opt_help(dhparam_options);
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| 104 | ret = 0;
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| 105 | goto end;
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| 106 | case OPT_INFORM:
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| 107 | if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
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| 108 | goto opthelp;
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| 109 | break;
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| 110 | case OPT_OUTFORM:
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| 111 | if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
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| 112 | goto opthelp;
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| 113 | break;
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| 114 | case OPT_IN:
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| 115 | infile = opt_arg();
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| 116 | break;
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| 117 | case OPT_OUT:
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| 118 | outfile = opt_arg();
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| 119 | break;
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| 120 | case OPT_ENGINE:
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| 121 | e = setup_engine(opt_arg(), 0);
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| 122 | break;
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| 123 | case OPT_CHECK:
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| 124 | check = 1;
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| 125 | break;
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| 126 | case OPT_TEXT:
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| 127 | text = 1;
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| 128 | break;
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| 129 | case OPT_DSAPARAM:
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| 130 | dsaparam = 1;
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| 131 | break;
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| 132 | case OPT_2:
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| 133 | g = 2;
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| 134 | break;
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| 135 | case OPT_3:
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| 136 | g = 3;
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| 137 | break;
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| 138 | case OPT_5:
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| 139 | g = 5;
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| 140 | break;
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| 141 | case OPT_NOOUT:
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| 142 | noout = 1;
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| 143 | break;
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| 144 | case OPT_VERBOSE:
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| 145 | verbose = 1;
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| 146 | break;
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| 147 | case OPT_QUIET:
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| 148 | verbose = 0;
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| 149 | break;
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| 150 | case OPT_R_CASES:
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| 151 | if (!opt_rand(o))
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| 152 | goto end;
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| 153 | break;
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| 154 | case OPT_PROV_CASES:
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| 155 | if (!opt_provider(o))
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| 156 | goto end;
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| 157 | break;
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| 158 | }
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| 159 | }
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| 160 |
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| 161 | /* One optional argument, bitsize to generate. */
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| 162 | argc = opt_num_rest();
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| 163 | argv = opt_rest();
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| 164 | if (argc == 1) {
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| 165 | if (!opt_int(argv[0], &num) || num <= 0)
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| 166 | goto opthelp;
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| 167 | } else if (!opt_check_rest_arg(NULL)) {
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| 168 | goto opthelp;
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| 169 | }
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| 170 | if (!app_RAND_load())
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| 171 | goto end;
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| 172 |
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| 173 | if (g && !num)
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| 174 | num = DEFBITS;
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| 175 |
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| 176 | if (dsaparam && g) {
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| 177 | BIO_printf(bio_err,
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| 178 | "Error, generator may not be chosen for DSA parameters\n");
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| 179 | goto end;
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| 180 | }
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| 181 |
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| 182 | out = bio_open_default(outfile, 'w', outformat);
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| 183 | if (out == NULL)
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| 184 | goto end;
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| 185 |
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| 186 | /* DH parameters */
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| 187 | if (num && !g)
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| 188 | g = 2;
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| 189 |
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| 190 | if (num) {
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| 191 | const char *alg = dsaparam ? "DSA" : "DH";
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| 192 |
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| 193 | if (infile != NULL) {
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| 194 | BIO_printf(bio_err, "Warning, input file %s ignored\n", infile);
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| 195 | }
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| 196 |
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| 197 | ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), alg, app_get0_propq());
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| 198 | if (ctx == NULL) {
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| 199 | BIO_printf(bio_err,
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| 200 | "Error, %s param generation context allocation failed\n",
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| 201 | alg);
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| 202 | goto end;
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| 203 | }
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| 204 | EVP_PKEY_CTX_set_app_data(ctx, bio_err);
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| 205 | if (verbose) {
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| 206 | EVP_PKEY_CTX_set_cb(ctx, progress_cb);
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| 207 | BIO_printf(bio_err,
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| 208 | "Generating %s parameters, %d bit long %sprime\n",
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| 209 | alg, num, dsaparam ? "" : "safe ");
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| 210 | }
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| 211 |
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| 212 | if (EVP_PKEY_paramgen_init(ctx) <= 0) {
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| 213 | BIO_printf(bio_err,
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| 214 | "Error, unable to initialise %s parameters\n",
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| 215 | alg);
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| 216 | goto end;
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| 217 | }
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| 218 |
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| 219 | if (dsaparam) {
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| 220 | if (EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num) <= 0) {
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| 221 | BIO_printf(bio_err, "Error, unable to set DSA prime length\n");
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| 222 | goto end;
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| 223 | }
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| 224 | } else {
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| 225 | if (EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, num) <= 0) {
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| 226 | BIO_printf(bio_err, "Error, unable to set DH prime length\n");
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| 227 | goto end;
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| 228 | }
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| 229 | if (EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g) <= 0) {
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| 230 | BIO_printf(bio_err, "Error, unable to set generator\n");
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| 231 | goto end;
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| 232 | }
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| 233 | }
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| 234 |
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| 235 | tmppkey = app_paramgen(ctx, alg);
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| 236 | if (tmppkey == NULL)
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| 237 | goto end;
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| 238 | EVP_PKEY_CTX_free(ctx);
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| 239 | ctx = NULL;
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| 240 | if (dsaparam) {
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| 241 | pkey = dsa_to_dh(tmppkey);
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| 242 | if (pkey == NULL)
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| 243 | goto end;
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| 244 | EVP_PKEY_free(tmppkey);
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| 245 | } else {
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| 246 | pkey = tmppkey;
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| 247 | }
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| 248 | tmppkey = NULL;
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| 249 | } else {
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| 250 | OSSL_DECODER_CTX *decoderctx = NULL;
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| 251 | const char *keytype = "DH";
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| 252 | int done;
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| 253 |
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| 254 | in = bio_open_default(infile, 'r', informat);
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| 255 | if (in == NULL)
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| 256 | goto end;
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| 257 |
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| 258 | do {
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| 259 | /*
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| 260 | * We assume we're done unless we explicitly want to retry and set
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| 261 | * this to 0 below.
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| 262 | */
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| 263 | done = 1;
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| 264 | /*
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| 265 | * We set NULL for the keytype to allow any key type. We don't know
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| 266 | * if we're going to get DH or DHX (or DSA in the event of dsaparam).
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| 267 | * We check that we got one of those key types afterwards.
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| 268 | */
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| 269 | decoderctx
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| 270 | = OSSL_DECODER_CTX_new_for_pkey(&tmppkey,
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| 271 | (informat == FORMAT_ASN1)
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| 272 | ? "DER" : "PEM",
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| 273 | NULL,
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| 274 | (informat == FORMAT_ASN1)
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| 275 | ? keytype : NULL,
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| 276 | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
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| 277 | NULL, NULL);
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| 278 |
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| 279 | if (decoderctx != NULL
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| 280 | && !OSSL_DECODER_from_bio(decoderctx, in)
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| 281 | && informat == FORMAT_ASN1
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| 282 | && strcmp(keytype, "DH") == 0) {
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| 283 | /*
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| 284 | * When reading DER we explicitly state the expected keytype
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| 285 | * because, unlike PEM, there is no header to declare what
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| 286 | * the contents of the DER file are. The decoders just try
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| 287 | * and guess. Unfortunately with DHX key types they may guess
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| 288 | * wrong and think we have a DSA keytype. Therefore, we try
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| 289 | * both DH and DHX sequentially.
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| 290 | */
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| 291 | keytype = "DHX";
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| 292 | /*
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| 293 | * BIO_reset() returns 0 for success for file BIOs only!!!
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| 294 | * This won't work for stdin (and never has done)
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| 295 | */
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| 296 | if (BIO_reset(in) == 0)
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| 297 | done = 0;
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| 298 | }
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| 299 | OSSL_DECODER_CTX_free(decoderctx);
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| 300 | } while (!done);
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| 301 | if (tmppkey == NULL) {
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| 302 | BIO_printf(bio_err, "Error, unable to load parameters\n");
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| 303 | goto end;
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| 304 | }
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| 305 |
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| 306 | if (dsaparam) {
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| 307 | if (!EVP_PKEY_is_a(tmppkey, "DSA")) {
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| 308 | BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
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| 309 | goto end;
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| 310 | }
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| 311 | pkey = dsa_to_dh(tmppkey);
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| 312 | if (pkey == NULL)
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| 313 | goto end;
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| 314 | } else {
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| 315 | if (!EVP_PKEY_is_a(tmppkey, "DH")
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| 316 | && !EVP_PKEY_is_a(tmppkey, "DHX")) {
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| 317 | BIO_printf(bio_err, "Error, unable to load DH parameters\n");
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| 318 | goto end;
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| 319 | }
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| 320 | pkey = tmppkey;
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| 321 | tmppkey = NULL;
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| 322 | }
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| 323 | }
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| 324 |
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| 325 | if (text)
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| 326 | EVP_PKEY_print_params(out, pkey, 4, NULL);
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| 327 |
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| 328 | if (check) {
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| 329 | ctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), pkey, app_get0_propq());
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| 330 | if (ctx == NULL) {
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| 331 | BIO_printf(bio_err, "Error, failed to check DH parameters\n");
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| 332 | goto end;
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| 333 | }
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| 334 | if (EVP_PKEY_param_check(ctx) <= 0) {
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| 335 | BIO_printf(bio_err, "Error, invalid parameters generated\n");
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| 336 | goto end;
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| 337 | }
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| 338 | BIO_printf(bio_err, "DH parameters appear to be ok.\n");
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| 339 | }
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| 340 |
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| 341 | if (!noout) {
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| 342 | OSSL_ENCODER_CTX *ectx =
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| 343 | OSSL_ENCODER_CTX_new_for_pkey(pkey,
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| 344 | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
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| 345 | outformat == FORMAT_ASN1
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| 346 | ? "DER" : "PEM",
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| 347 | NULL, NULL);
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| 348 |
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| 349 | if (ectx == NULL || !OSSL_ENCODER_to_bio(ectx, out)) {
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| 350 | OSSL_ENCODER_CTX_free(ectx);
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| 351 | BIO_printf(bio_err, "Error, unable to write DH parameters\n");
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| 352 | goto end;
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| 353 | }
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| 354 | OSSL_ENCODER_CTX_free(ectx);
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| 355 | }
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| 356 | ret = 0;
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| 357 | end:
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| 358 | if (ret != 0)
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| 359 | ERR_print_errors(bio_err);
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| 360 | BIO_free(in);
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| 361 | BIO_free_all(out);
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| 362 | EVP_PKEY_free(pkey);
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| 363 | EVP_PKEY_free(tmppkey);
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| 364 | EVP_PKEY_CTX_free(ctx);
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| 365 | release_engine(e);
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| 366 | return ret;
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| 367 | }
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| 368 |
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| 369 | /*
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| 370 | * Historically we had the low-level call DSA_dup_DH() to do this.
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| 371 | * That is now deprecated with no replacement. Since we still need to do this
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| 372 | * for backwards compatibility reasons, we do it "manually".
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| 373 | */
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| 374 | static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh)
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| 375 | {
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| 376 | OSSL_PARAM_BLD *tmpl = NULL;
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| 377 | OSSL_PARAM *params = NULL;
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| 378 | BIGNUM *bn_p = NULL, *bn_q = NULL, *bn_g = NULL;
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| 379 | EVP_PKEY_CTX *ctx = NULL;
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| 380 | EVP_PKEY *pkey = NULL;
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| 381 |
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| 382 | if (!EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_P, &bn_p)
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| 383 | || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_Q, &bn_q)
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| 384 | || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_G, &bn_g)) {
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| 385 | BIO_printf(bio_err, "Error, failed to set DH parameters\n");
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| 386 | goto err;
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| 387 | }
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| 388 |
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| 389 | if ((tmpl = OSSL_PARAM_BLD_new()) == NULL
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| 390 | || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P,
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| 391 | bn_p)
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| 392 | || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q,
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| 393 | bn_q)
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| 394 | || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G,
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| 395 | bn_g)
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| 396 | || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
|
|---|
| 397 | BIO_printf(bio_err, "Error, failed to set DH parameters\n");
|
|---|
| 398 | goto err;
|
|---|
| 399 | }
|
|---|
| 400 |
|
|---|
| 401 | ctx = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "DHX", app_get0_propq());
|
|---|
| 402 | if (ctx == NULL
|
|---|
| 403 | || EVP_PKEY_fromdata_init(ctx) <= 0
|
|---|
| 404 | || EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS, params) <= 0) {
|
|---|
| 405 | BIO_printf(bio_err, "Error, failed to set DH parameters\n");
|
|---|
| 406 | goto err;
|
|---|
| 407 | }
|
|---|
| 408 |
|
|---|
| 409 | err:
|
|---|
| 410 | EVP_PKEY_CTX_free(ctx);
|
|---|
| 411 | OSSL_PARAM_free(params);
|
|---|
| 412 | OSSL_PARAM_BLD_free(tmpl);
|
|---|
| 413 | BN_free(bn_p);
|
|---|
| 414 | BN_free(bn_q);
|
|---|
| 415 | BN_free(bn_g);
|
|---|
| 416 | return pkey;
|
|---|
| 417 | }
|
|---|
| 418 |
|
|---|
