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
  18 #undef BUFSIZE
  19 #define BUFSIZE 1024*8
  20
  21 typedef enum OPTION_choice {
  22     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  23     OPT_MACOPT, OPT_BIN, OPT_IN, OPT_OUT
  24 } OPTION_CHOICE;
  25
  26 const OPTIONS mac_options[] = {
  27     {OPT_HELP_STR, 1, '-', "Usage: %s [options] mac_name\n"},
  28     {OPT_HELP_STR, 1, '-', "mac_name\t\t MAC algorithm (See list "
  29                            "-mac-algorithms)"},
  30     {"help", OPT_HELP, '-', "Display this summary"},
  31     {"macopt", OPT_MACOPT, 's', "MAC algorithm control parameters in n:v form. "
  32                                 "See 'Supported Controls' in the EVP_MAC_ docs"},
  33     {"in", OPT_IN, '<', "Input file to MAC (default is stdin)"},
  34     {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
  35     {"binary", OPT_BIN, '-', "Output in binary format (Default is hexadecimal "
  36                              "output)"},
  37     {NULL}
  38 };
  39
  40 static int mac_ctrl_string(EVP_MAC_CTX *ctx, const char *value)
  41 {
  42     int rv;
  43     char *stmp, *vtmp = NULL;
  44
  45     stmp = OPENSSL_strdup(value);
  46     if (stmp == NULL)
  47         return -1;
  48     vtmp = strchr(stmp, ':');
  49     if (vtmp != NULL) {
  50         *vtmp = 0;
  51         vtmp++;
  52     }
  53     rv = EVP_MAC_ctrl_str(ctx, stmp, vtmp);
  54     OPENSSL_free(stmp);
  55     return rv;
  56 }
  57
  58 int mac_main(int argc, char **argv)
  59 {
  60     int ret = 1;
  61     char *prog;
  62     const EVP_MAC *mac = NULL;
  63     OPTION_CHOICE o;
  64     EVP_MAC_CTX *ctx = NULL;
  65     STACK_OF(OPENSSL_STRING) *opts = NULL;
  66     unsigned char *buf = NULL;
  67     size_t len;
  68     int i;
  69     BIO *in = NULL, *out = NULL;
  70     const char *outfile = NULL;
  71     const char *infile = NULL;
  72     int out_bin = 0;
  73     int inform = FORMAT_BINARY;
  74
  75     prog = opt_init(argc, argv, mac_options);
  76     buf = app_malloc(BUFSIZE, "I/O buffer");
  77     while ((o = opt_next()) != OPT_EOF) {
  78         switch (o) {
  79         case OPT_EOF:
  80         case OPT_ERR:
  81 opthelp:
  82             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  83             goto err;
  84         case OPT_HELP:
  85             opt_help(mac_options);
  86             ret = 0;
  87             goto err;
  88         case OPT_BIN:
  89             out_bin = 1;
  90             break;
  91         case OPT_IN:
  92             infile = opt_arg();
  93             break;
  94         case OPT_OUT:
  95             outfile = opt_arg();
  96             break;
  97         case OPT_MACOPT:
  98             if (opts == NULL)
  99                 opts = sk_OPENSSL_STRING_new_null();
 100             if (opts == NULL || !sk_OPENSSL_STRING_push(opts, opt_arg()))
 101                 goto opthelp;
 102             break;
 103         }
 104     }
 105     argc = opt_num_rest();
 106     argv = opt_rest();
 107
 108     if (argc != 1) {
 109         BIO_printf(bio_err, "Invalid number of extra arguments\n");
 110         goto opthelp;
 111     }
 112
 113     mac = EVP_get_macbyname(argv[0]);
 114     if (mac == NULL) {
 115         BIO_printf(bio_err, "Invalid MAC name %s\n", argv[0]);
 116         goto opthelp;
 117     }
 118
 119     ctx = EVP_MAC_CTX_new(mac);
 120     if (ctx == NULL)
 121         goto err;
 122
 123     if (opts != NULL) {
 124         for (i = 0; i < sk_OPENSSL_STRING_num(opts); i++) {
 125             char *opt = sk_OPENSSL_STRING_value(opts, i);
 126             if (mac_ctrl_string(ctx, opt) <= 0) {
 127                 BIO_printf(bio_err, "MAC parameter error '%s'\n", opt);
 128                 ERR_print_errors(bio_err);
 129                 goto err;
 130             }
 131         }
 132     }
 133
 134     /* Use text mode for stdin */
 135     if (infile == NULL || strcmp(infile, "-") == 0)
 136         inform = FORMAT_TEXT;
 137     in = bio_open_default(infile, 'r', inform);
 138     if (in == NULL)
 139         goto err;
 140
 141     out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
 142     if (out == NULL)
 143         goto err;
 144
 145     if (!EVP_MAC_init(ctx)) {
 146         BIO_printf(bio_err, "EVP_MAC_Init failed\n");
 147         goto err;
 148     }
 149
 150
 151     for (;;) {
 152         i = BIO_read(in, (char *)buf, BUFSIZE);
 153         if (i < 0) {
 154             BIO_printf(bio_err, "Read Error in '%s'\n", infile);
 155             goto err;
 156         }
 157         if (i == 0)
 158             break;
 159         if (!EVP_MAC_update(ctx, buf, i)) {
 160             BIO_printf(bio_err, "EVP_MAC_update failed\n");
 161             goto err;
 162         }
 163     }
 164
 165     if (!EVP_MAC_final(ctx, NULL, &len)) {
 166         BIO_printf(bio_err, "EVP_MAC_final failed\n");
 167         goto err;
 168     }
 169     if (len > BUFSIZE) {
 170         BIO_printf(bio_err, "output len is too large\n");
 171         goto err;
 172     }
 173
 174     if (!EVP_MAC_final(ctx, buf, &len)) {
 175         BIO_printf(bio_err, "EVP_MAC_final failed\n");
 176         goto err;
 177     }
 178
 179     if (out_bin) {
 180         BIO_write(out, buf, len);
 181     } else {
 182         if (outfile == NULL)
 183             BIO_printf(out,"\n");
 184         for (i = 0; i < (int)len; ++i)
 185             BIO_printf(out, "%02X", buf[i]);
 186         if (outfile == NULL)
 187             BIO_printf(out,"\n");
 188     }
 189
 190     ret = 0;
 191 err:
 192     if (ret != 0)
 193         ERR_print_errors(bio_err);
 194     OPENSSL_clear_free(buf, BUFSIZE);
 195     sk_OPENSSL_STRING_free(opts);
 196     BIO_free(in);
 197     BIO_free(out);
 198     EVP_MAC_CTX_free(ctx);
 199     return ret;
 200 }