apps/pkeyparam.c

   1 /*
   2  * Copyright 2006-2017 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 <stdio.h>
  11 #include <string.h>
  12 #include "apps.h"
  13 #include <openssl/pem.h>
  14 #include <openssl/err.h>
  15 #include <openssl/evp.h>
  16
  17 typedef enum OPTION_choice {
  18     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  19     OPT_IN, OPT_OUT, OPT_TEXT, OPT_NOOUT,
  20     OPT_ENGINE, OPT_CHECK
  21 } OPTION_CHOICE;
  22
  23 const OPTIONS pkeyparam_options[] = {
  24     {"help", OPT_HELP, '-', "Display this summary"},
  25     {"in", OPT_IN, '<', "Input file"},
  26     {"out", OPT_OUT, '>', "Output file"},
  27     {"text", OPT_TEXT, '-', "Print parameters as text"},
  28     {"noout", OPT_NOOUT, '-', "Don't output encoded parameters"},
  29 #ifndef OPENSSL_NO_ENGINE
  30     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  31 #endif
  32     {"check", OPT_CHECK, '-', "Check key param consistency"},
  33     {NULL}
  34 };
  35
  36 int pkeyparam_main(int argc, char **argv)
  37 {
  38     ENGINE *e = NULL;
  39     BIO *in = NULL, *out = NULL;
  40     EVP_PKEY *pkey = NULL;
  41     int text = 0, noout = 0, ret = 1, check = 0;
  42     OPTION_CHOICE o;
  43     char *infile = NULL, *outfile = NULL, *prog;
  44
  45     prog = opt_init(argc, argv, pkeyparam_options);
  46     while ((o = opt_next()) != OPT_EOF) {
  47         switch (o) {
  48         case OPT_EOF:
  49         case OPT_ERR:
  50  opthelp:
  51             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  52             goto end;
  53         case OPT_HELP:
  54             opt_help(pkeyparam_options);
  55             ret = 0;
  56             goto end;
  57         case OPT_IN:
  58             infile = opt_arg();
  59             break;
  60         case OPT_OUT:
  61             outfile = opt_arg();
  62             break;
  63         case OPT_ENGINE:
  64             e = setup_engine(opt_arg(), 0);
  65             break;
  66         case OPT_TEXT:
  67             text = 1;
  68             break;
  69         case OPT_NOOUT:
  70             noout = 1;
  71             break;
  72         case OPT_CHECK:
  73             check = 1;
  74             break;
  75         }
  76     }
  77     argc = opt_num_rest();
  78     if (argc != 0)
  79         goto opthelp;
  80
  81     in = bio_open_default(infile, 'r', FORMAT_PEM);
  82     if (in == NULL)
  83         goto end;
  84     out = bio_open_default(outfile, 'w', FORMAT_PEM);
  85     if (out == NULL)
  86         goto end;
  87     pkey = PEM_read_bio_Parameters(in, NULL);
  88     if (pkey == NULL) {
  89         BIO_printf(bio_err, "Error reading parameters\n");
  90         ERR_print_errors(bio_err);
  91         goto end;
  92     }
  93
  94     if (check) {
  95         int r;
  96         EVP_PKEY_CTX *ctx;
  97
  98         ctx = EVP_PKEY_CTX_new(pkey, e);
  99         if (ctx == NULL) {
 100             ERR_print_errors(bio_err);
 101             goto end;
 102         }
 103
 104         r = EVP_PKEY_param_check(ctx);
 105
 106         if (r == 1) {
 107             BIO_printf(out, "Parameters are valid\n");
 108         } else {
 109             /*
 110              * Note: at least for RSA keys if this function returns
 111              * -1, there will be no error reasons.
 112              */
 113             unsigned long err;
 114
 115             BIO_printf(out, "Parameters are invalid\n");
 116
 117             while ((err = ERR_peek_error()) != 0) {
 118                 BIO_printf(out, "Detailed error: %s\n",
 119                            ERR_reason_error_string(err));
 120                 ERR_get_error(); /* remove err from error stack */
 121             }
 122         }
 123         EVP_PKEY_CTX_free(ctx);
 124     }
 125
 126     if (!noout)
 127         PEM_write_bio_Parameters(out, pkey);
 128
 129     if (text)
 130         EVP_PKEY_print_params(out, pkey, 0, NULL);
 131
 132     ret = 0;
 133
 134  end:
 135     EVP_PKEY_free(pkey);
 136     release_engine(e);
 137     BIO_free_all(out);
 138     BIO_free(in);
 139
 140     return ret;
 141 }