apps/ec.c

   1 /*
   2  * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #include <openssl/opensslconf.h>
  12 #include <openssl/evp.h>
  13 #include <openssl/encoder.h>
  14 #include <openssl/decoder.h>
  15 #include <openssl/core_names.h>
  16 #include <openssl/core_dispatch.h>
  17 #include <openssl/params.h>
  18 #include <openssl/err.h>
  19
  20 #include "apps.h"
  21 #include "progs.h"
  22 #include "ec_common.h"
  23
  24 typedef enum OPTION_choice {
  25     OPT_COMMON,
  26     OPT_INFORM, OPT_OUTFORM, OPT_ENGINE, OPT_IN, OPT_OUT,
  27     OPT_NOOUT, OPT_TEXT, OPT_PARAM_OUT, OPT_PUBIN, OPT_PUBOUT,
  28     OPT_PASSIN, OPT_PASSOUT, OPT_PARAM_ENC, OPT_CONV_FORM, OPT_CIPHER,
  29     OPT_NO_PUBLIC, OPT_CHECK, OPT_PROV_ENUM
  30 } OPTION_CHOICE;
  31
  32 const OPTIONS ec_options[] = {
  33     OPT_SECTION("General"),
  34     {"help", OPT_HELP, '-', "Display this summary"},
  35 #ifndef OPENSSL_NO_ENGINE
  36     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  37 #endif
  38
  39     OPT_SECTION("Input"),
  40     {"in", OPT_IN, 's', "Input file"},
  41     {"inform", OPT_INFORM, 'f', "Input format (DER/PEM/P12/ENGINE)"},
  42     {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
  43     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  44     {"check", OPT_CHECK, '-', "check key consistency"},
  45     {"", OPT_CIPHER, '-', "Any supported cipher"},
  46     {"param_enc", OPT_PARAM_ENC, 's',
  47      "Specifies the way the ec parameters are encoded"},
  48     {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
  49
  50     OPT_SECTION("Output"),
  51     {"out", OPT_OUT, '>', "Output file"},
  52     {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
  53     {"noout", OPT_NOOUT, '-', "Don't print key out"},
  54     {"text", OPT_TEXT, '-', "Print the key"},
  55     {"param_out", OPT_PARAM_OUT, '-', "Print the elliptic curve parameters"},
  56     {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
  57     {"no_public", OPT_NO_PUBLIC, '-', "exclude public key from private key"},
  58     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
  59
  60     OPT_PROV_OPTIONS,
  61     {NULL}
  62 };
  63
  64 int ec_main(int argc, char **argv)
  65 {
  66     OSSL_ENCODER_CTX *ectx = NULL;
  67     OSSL_DECODER_CTX *dctx = NULL;
  68     EVP_PKEY_CTX *pctx = NULL;
  69     EVP_PKEY *eckey = NULL;
  70     BIO *out = NULL;
  71     ENGINE *e = NULL;
  72     EVP_CIPHER *enc = NULL;
  73     char *infile = NULL, *outfile = NULL, *ciphername = NULL, *prog;
  74     char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;
  75     OPTION_CHOICE o;
  76     int informat = FORMAT_UNDEF, outformat = FORMAT_PEM, text = 0, noout = 0;
  77     int pubin = 0, pubout = 0, param_out = 0, ret = 1, private = 0;
  78     int check = 0;
  79     char *asn1_encoding = NULL;
  80     char *point_format = NULL;
  81     int no_public = 0;
  82
  83     opt_set_unknown_name("cipher");
  84     prog = opt_init(argc, argv, ec_options);
  85     while ((o = opt_next()) != OPT_EOF) {
  86         switch (o) {
  87         case OPT_EOF:
  88         case OPT_ERR:
  89  opthelp:
  90             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  91             goto end;
  92         case OPT_HELP:
  93             opt_help(ec_options);
  94             ret = 0;
  95             goto end;
  96         case OPT_INFORM:
  97             if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
  98                 goto opthelp;
  99             break;
 100         case OPT_IN:
 101             infile = opt_arg();
 102             break;
 103         case OPT_OUTFORM:
 104             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 105                 goto opthelp;
 106             break;
 107         case OPT_OUT:
 108             outfile = opt_arg();
 109             break;
 110         case OPT_NOOUT:
 111             noout = 1;
 112             break;
 113         case OPT_TEXT:
 114             text = 1;
 115             break;
 116         case OPT_PARAM_OUT:
 117             param_out = 1;
 118             break;
 119         case OPT_PUBIN:
 120             pubin = 1;
 121             break;
 122         case OPT_PUBOUT:
 123             pubout = 1;
 124             break;
 125         case OPT_PASSIN:
 126             passinarg = opt_arg();
 127             break;
 128         case OPT_PASSOUT:
 129             passoutarg = opt_arg();
 130             break;
 131         case OPT_ENGINE:
 132             e = setup_engine(opt_arg(), 0);
 133             break;
 134         case OPT_CIPHER:
 135             ciphername = opt_unknown();
 136             break;
 137         case OPT_CONV_FORM:
 138             point_format = opt_arg();
 139             if (!opt_string(point_format, point_format_options))
 140                 goto opthelp;
 141             break;
 142         case OPT_PARAM_ENC:
 143             asn1_encoding = opt_arg();
 144             if (!opt_string(asn1_encoding, asn1_encoding_options))
 145                 goto opthelp;
 146             break;
 147         case OPT_NO_PUBLIC:
 148             no_public = 1;
 149             break;
 150         case OPT_CHECK:
 151             check = 1;
 152             break;
 153         case OPT_PROV_CASES:
 154             if (!opt_provider(o))
 155                 goto end;
 156             break;
 157         }
 158     }
 159
 160     /* No extra arguments. */
 161     if (!opt_check_rest_arg(NULL))
 162         goto opthelp;
 163
 164     if (!opt_cipher(ciphername, &enc))
 165         goto opthelp;
 166     private = param_out || pubin || pubout ? 0 : 1;
 167     if (text && !pubin)
 168         private = 1;
 169
 170     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 171         BIO_printf(bio_err, "Error getting passwords\n");
 172         goto end;
 173     }
 174
 175     BIO_printf(bio_err, "read EC key\n");
 176
 177     if (pubin)
 178         eckey = load_pubkey(infile, informat, 1, passin, e, "public key");
 179     else
 180         eckey = load_key(infile, informat, 1, passin, e, "private key");
 181
 182     if (eckey == NULL) {
 183         BIO_printf(bio_err, "unable to load Key\n");
 184         goto end;
 185     }
 186
 187     out = bio_open_owner(outfile, outformat, private);
 188     if (out == NULL)
 189         goto end;
 190
 191     if (point_format
 192         && !EVP_PKEY_set_utf8_string_param(
 193                 eckey, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
 194                 point_format)) {
 195         BIO_printf(bio_err, "unable to set point conversion format\n");
 196         goto end;
 197     }
 198
 199     if (asn1_encoding != NULL
 200         && !EVP_PKEY_set_utf8_string_param(
 201                 eckey, OSSL_PKEY_PARAM_EC_ENCODING, asn1_encoding)) {
 202         BIO_printf(bio_err, "unable to set asn1 encoding format\n");
 203         goto end;
 204     }
 205
 206     if (no_public) {
 207         if (!EVP_PKEY_set_int_param(eckey, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, 0)) {
 208             BIO_printf(bio_err, "unable to disable public key encoding\n");
 209             goto end;
 210         }
 211     } else {
 212         if (!EVP_PKEY_set_int_param(eckey, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, 1)) {
 213             BIO_printf(bio_err, "unable to enable public key encoding\n");
 214             goto end;
 215         }
 216     }
 217
 218     if (text) {
 219         assert(pubin || private);
 220         if ((pubin && EVP_PKEY_print_public(out, eckey, 0, NULL) <= 0)
 221             || (!pubin && EVP_PKEY_print_private(out, eckey, 0, NULL) <= 0)) {
 222             BIO_printf(bio_err, "unable to print EC key\n");
 223             goto end;
 224         }
 225     }
 226
 227     if (check) {
 228         pctx = EVP_PKEY_CTX_new_from_pkey(NULL, eckey, NULL);
 229         if (pctx == NULL) {
 230             BIO_printf(bio_err, "unable to check EC key\n");
 231             goto end;
 232         }
 233         if (!EVP_PKEY_check(pctx))
 234             BIO_printf(bio_err, "EC Key Invalid!\n");
 235         else
 236             BIO_printf(bio_err, "EC Key valid.\n");
 237         ERR_print_errors(bio_err);
 238     }
 239
 240     if (!noout) {
 241         int selection;
 242         const char *output_type = outformat == FORMAT_ASN1 ? "DER" : "PEM";
 243         const char *output_structure = "type-specific";
 244
 245         BIO_printf(bio_err, "writing EC key\n");
 246         if (param_out) {
 247             selection = OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
 248         } else if (pubin || pubout) {
 249             selection = OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
 250                 | OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
 251             output_structure = "SubjectPublicKeyInfo";
 252         } else {
 253             selection = OSSL_KEYMGMT_SELECT_ALL;
 254             assert(private);
 255         }
 256
 257         ectx = OSSL_ENCODER_CTX_new_for_pkey(eckey, selection,
 258                                              output_type, output_structure,
 259                                              NULL);
 260         if (enc != NULL) {
 261             OSSL_ENCODER_CTX_set_cipher(ectx, EVP_CIPHER_get0_name(enc), NULL);
 262             /* Default passphrase prompter */
 263             OSSL_ENCODER_CTX_set_passphrase_ui(ectx, get_ui_method(), NULL);
 264             if (passout != NULL)
 265                 /* When passout given, override the passphrase prompter */
 266                 OSSL_ENCODER_CTX_set_passphrase(ectx,
 267                                                 (const unsigned char *)passout,
 268                                                 strlen(passout));
 269         }
 270         if (!OSSL_ENCODER_to_bio(ectx, out)) {
 271             BIO_printf(bio_err, "unable to write EC key\n");
 272             goto end;
 273         }
 274     }
 275
 276     ret = 0;
 277 end:
 278     if (ret != 0)
 279         ERR_print_errors(bio_err);
 280     BIO_free_all(out);
 281     EVP_PKEY_free(eckey);
 282     EVP_CIPHER_free(enc);
 283     OSSL_ENCODER_CTX_free(ectx);
 284     OSSL_DECODER_CTX_free(dctx);
 285     EVP_PKEY_CTX_free(pctx);
 286     release_engine(e);
 287     if (passin != NULL)
 288         OPENSSL_clear_free(passin, strlen(passin));
 289     if (passout != NULL)
 290         OPENSSL_clear_free(passout, strlen(passout));
 291     return ret;
 292 }