apps/mac.c

   1 /*
   2  * Copyright 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 <string.h>
  11
  12 #include "apps.h"
  13 #include "progs.h"
  14 #include <openssl/bio.h>
  15 #include <openssl/err.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/params.h>
  18
  19 #undef BUFSIZE
  20 #define BUFSIZE 1024*8
  21
  22 typedef enum OPTION_choice {
  23     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  24     OPT_MACOPT, OPT_BIN, OPT_IN, OPT_OUT
  25 } OPTION_CHOICE;
  26
  27 const OPTIONS mac_options[] = {
  28     {OPT_HELP_STR, 1, '-', "Usage: %s [options] mac_name\n"},
  29
  30     OPT_SECTION("General"),
  31     {"help", OPT_HELP, '-', "Display this summary"},
  32     {"macopt", OPT_MACOPT, 's', "MAC algorithm parameters in n:v form"},
  33     {OPT_MORE_STR, 1, '-', "See 'PARAMETER NAMES' in the EVP_MAC_ docs"},
  34
  35     OPT_SECTION("Input"),
  36     {"in", OPT_IN, '<', "Input file to MAC (default is stdin)"},
  37
  38     OPT_SECTION("Output"),
  39     {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
  40     {"binary", OPT_BIN, '-',
  41         "Output in binary format (default is hexadecimal)"},
  42
  43     OPT_PARAMETERS(),
  44     {"mac_name", 0, 0, "MAC algorithm"},
  45     {NULL}
  46 };
  47
  48 int mac_main(int argc, char **argv)
  49 {
  50     int ret = 1;
  51     char *prog;
  52     EVP_MAC *mac = NULL;
  53     OPTION_CHOICE o;
  54     EVP_MAC_CTX *ctx = NULL;
  55     STACK_OF(OPENSSL_STRING) *opts = NULL;
  56     unsigned char *buf = NULL;
  57     size_t len;
  58     int i;
  59     BIO *in = NULL, *out = NULL;
  60     const char *outfile = NULL;
  61     const char *infile = NULL;
  62     int out_bin = 0;
  63     int inform = FORMAT_BINARY;
  64
  65     prog = opt_init(argc, argv, mac_options);
  66     buf = app_malloc(BUFSIZE, "I/O buffer");
  67     while ((o = opt_next()) != OPT_EOF) {
  68         switch (o) {
  69         default:
  70 opthelp:
  71             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  72             goto err;
  73         case OPT_HELP:
  74             opt_help(mac_options);
  75             ret = 0;
  76             goto err;
  77         case OPT_BIN:
  78             out_bin = 1;
  79             break;
  80         case OPT_IN:
  81             infile = opt_arg();
  82             break;
  83         case OPT_OUT:
  84             outfile = opt_arg();
  85             break;
  86         case OPT_MACOPT:
  87             if (opts == NULL)
  88                 opts = sk_OPENSSL_STRING_new_null();
  89             if (opts == NULL || !sk_OPENSSL_STRING_push(opts, opt_arg()))
  90                 goto opthelp;
  91             break;
  92         }
  93     }
  94     argc = opt_num_rest();
  95     argv = opt_rest();
  96
  97     if (argc != 1) {
  98         BIO_printf(bio_err, "Invalid number of extra arguments\n");
  99         goto opthelp;
 100     }
 101
 102     mac = EVP_MAC_fetch(NULL, argv[0], NULL);
 103     if (mac == NULL) {
 104         BIO_printf(bio_err, "Invalid MAC name %s\n", argv[0]);
 105         goto opthelp;
 106     }
 107
 108     ctx = EVP_MAC_CTX_new(mac);
 109     if (ctx == NULL)
 110         goto err;
 111
 112     if (opts != NULL) {
 113         int ok = 1;
 114         OSSL_PARAM *params =
 115             app_params_new_from_opts(opts, EVP_MAC_settable_ctx_params(mac));
 116
 117         if (params == NULL)
 118             goto err;
 119
 120         if (!EVP_MAC_CTX_set_params(ctx, params)) {
 121             BIO_printf(bio_err, "MAC parameter error\n");
 122             ERR_print_errors(bio_err);
 123             ok = 0;
 124         }
 125         app_params_free(params);
 126         if (!ok)
 127             goto err;
 128     }
 129
 130     /* Use text mode for stdin */
 131     if (infile == NULL || strcmp(infile, "-") == 0)
 132         inform = FORMAT_TEXT;
 133     in = bio_open_default(infile, 'r', inform);
 134     if (in == NULL)
 135         goto err;
 136
 137     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 138     if (out == NULL)
 139         goto err;
 140
 141     if (!EVP_MAC_init(ctx)) {
 142         BIO_printf(bio_err, "EVP_MAC_Init failed\n");
 143         goto err;
 144     }
 145
 146     for (;;) {
 147         i = BIO_read(in, (char *)buf, BUFSIZE);
 148         if (i < 0) {
 149             BIO_printf(bio_err, "Read Error in '%s'\n", infile);
 150             goto err;
 151         }
 152         if (i == 0)
 153             break;
 154         if (!EVP_MAC_update(ctx, buf, i)) {
 155             BIO_printf(bio_err, "EVP_MAC_update failed\n");
 156             goto err;
 157         }
 158     }
 159
 160     if (!EVP_MAC_final(ctx, NULL, &len, 0)) {
 161         BIO_printf(bio_err, "EVP_MAC_final failed\n");
 162         goto err;
 163     }
 164     if (len > BUFSIZE) {
 165         BIO_printf(bio_err, "output len is too large\n");
 166         goto err;
 167     }
 168
 169     if (!EVP_MAC_final(ctx, buf, &len, BUFSIZE)) {
 170         BIO_printf(bio_err, "EVP_MAC_final failed\n");
 171         goto err;
 172     }
 173
 174     if (out_bin) {
 175         BIO_write(out, buf, len);
 176     } else {
 177         if (outfile == NULL)
 178             BIO_printf(out,"\n");
 179         for (i = 0; i < (int)len; ++i)
 180             BIO_printf(out, "%02X", buf[i]);
 181         if (outfile == NULL)
 182             BIO_printf(out,"\n");
 183     }
 184
 185     ret = 0;
 186 err:
 187     if (ret != 0)
 188         ERR_print_errors(bio_err);
 189     OPENSSL_clear_free(buf, BUFSIZE);
 190     sk_OPENSSL_STRING_free(opts);
 191     BIO_free(in);
 192     BIO_free(out);
 193     EVP_MAC_CTX_free(ctx);
 194     EVP_MAC_free(mac);
 195     return ret;
 196 }