| /* |
| * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <openssl/opensslconf.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <time.h> |
| #include <string.h> |
| #include "apps.h" |
| #include "progs.h" |
| #include <openssl/bio.h> |
| #include <openssl/err.h> |
| #include <openssl/bn.h> |
| #include <openssl/dsa.h> |
| #include <openssl/dh.h> |
| #include <openssl/x509.h> |
| #include <openssl/pem.h> |
| #include <openssl/core_names.h> |
| #include <openssl/core_dispatch.h> |
| #include <openssl/param_build.h> |
| #include <openssl/encoder.h> |
| #include <openssl/decoder.h> |
| |
| #define DEFBITS 2048 |
| |
| static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh); |
| |
| static int verbose = 1; |
| |
| typedef enum OPTION_choice { |
| OPT_COMMON, |
| OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, |
| OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT, |
| OPT_DSAPARAM, OPT_2, OPT_3, OPT_5, OPT_VERBOSE, OPT_QUIET, |
| OPT_R_ENUM, OPT_PROV_ENUM |
| } OPTION_CHOICE; |
| |
| const OPTIONS dhparam_options[] = { |
| {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"}, |
| |
| OPT_SECTION("General"), |
| {"help", OPT_HELP, '-', "Display this summary"}, |
| {"check", OPT_CHECK, '-', "Check the DH parameters"}, |
| #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_DEPRECATED_3_0) |
| {"dsaparam", OPT_DSAPARAM, '-', |
| "Read or generate DSA parameters, convert to DH"}, |
| #endif |
| #ifndef OPENSSL_NO_ENGINE |
| {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"}, |
| #endif |
| |
| OPT_SECTION("Input"), |
| {"in", OPT_IN, '<', "Input file"}, |
| {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"}, |
| |
| OPT_SECTION("Output"), |
| {"out", OPT_OUT, '>', "Output file"}, |
| {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"}, |
| {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"}, |
| {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"}, |
| {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"}, |
| {"3", OPT_3, '-', "Generate parameters using 3 as the generator value"}, |
| {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"}, |
| {"verbose", OPT_VERBOSE, '-', "Verbose output"}, |
| {"quiet", OPT_QUIET, '-', "Terse output"}, |
| |
| OPT_R_OPTIONS, |
| OPT_PROV_OPTIONS, |
| |
| OPT_PARAMETERS(), |
| {"numbits", 0, 0, "Number of bits if generating parameters (optional)"}, |
| {NULL} |
| }; |
| |
| int dhparam_main(int argc, char **argv) |
| { |
| BIO *in = NULL, *out = NULL; |
| EVP_PKEY *pkey = NULL, *tmppkey = NULL; |
| EVP_PKEY_CTX *ctx = NULL; |
| char *infile = NULL, *outfile = NULL, *prog; |
| ENGINE *e = NULL; |
| int dsaparam = 0; |
| int text = 0, ret = 1, num = 0, g = 0; |
| int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0; |
| OPTION_CHOICE o; |
| |
| prog = opt_init(argc, argv, dhparam_options); |
| while ((o = opt_next()) != OPT_EOF) { |
| switch (o) { |
| case OPT_EOF: |
| case OPT_ERR: |
| opthelp: |
| BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); |
| goto end; |
| case OPT_HELP: |
| opt_help(dhparam_options); |
| ret = 0; |
| goto end; |
| case OPT_INFORM: |
| if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) |
| goto opthelp; |
| break; |
| case OPT_OUTFORM: |
| if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat)) |
| goto opthelp; |
| break; |
| case OPT_IN: |
| infile = opt_arg(); |
| break; |
| case OPT_OUT: |
| outfile = opt_arg(); |
| break; |
| case OPT_ENGINE: |
| e = setup_engine(opt_arg(), 0); |
| break; |
| case OPT_CHECK: |
| check = 1; |
| break; |
| case OPT_TEXT: |
| text = 1; |
| break; |
| case OPT_DSAPARAM: |
| dsaparam = 1; |
| break; |
| case OPT_2: |
| g = 2; |
| break; |
| case OPT_3: |
| g = 3; |
| break; |
| case OPT_5: |
| g = 5; |
| break; |
| case OPT_NOOUT: |
| noout = 1; |
| break; |
| case OPT_VERBOSE: |
| verbose = 1; |
| break; |
| case OPT_QUIET: |
| verbose = 0; |
| break; |
| case OPT_R_CASES: |
| if (!opt_rand(o)) |
| goto end; |
| break; |
| case OPT_PROV_CASES: |
| if (!opt_provider(o)) |
| goto end; |
| break; |
| } |
| } |
| |
| /* One optional argument, bitsize to generate. */ |
| argc = opt_num_rest(); |
| argv = opt_rest(); |
| if (argc == 1) { |
| if (!opt_int(argv[0], &num) || num <= 0) |
| goto opthelp; |
| } else if (!opt_check_rest_arg(NULL)) { |
| goto opthelp; |
| } |
| if (!app_RAND_load()) |
| goto end; |
| |
| if (g && !num) |
| num = DEFBITS; |
| |
| if (dsaparam && g) { |
| BIO_printf(bio_err, |
| "Error, generator may not be chosen for DSA parameters\n"); |
| goto end; |
| } |
| |
| out = bio_open_default(outfile, 'w', outformat); |
| if (out == NULL) |
| goto end; |
| |
| /* DH parameters */ |
| if (num && !g) |
| g = 2; |
| |
| if (num) { |
| const char *alg = dsaparam ? "DSA" : "DH"; |
| |
| ctx = EVP_PKEY_CTX_new_from_name(NULL, alg, NULL); |
| if (ctx == NULL) { |
| BIO_printf(bio_err, |
| "Error, %s param generation context allocation failed\n", |
| alg); |
| goto end; |
| } |
| EVP_PKEY_CTX_set_app_data(ctx, bio_err); |
| if (verbose) { |
| EVP_PKEY_CTX_set_cb(ctx, progress_cb); |
| BIO_printf(bio_err, |
| "Generating %s parameters, %d bit long %sprime\n", |
| alg, num, dsaparam ? "" : "safe "); |
| } |
| |
| if (EVP_PKEY_paramgen_init(ctx) <= 0) { |
| BIO_printf(bio_err, |
| "Error, unable to initialise %s parameters\n", |
| alg); |
| goto end; |
| } |
| |
| if (dsaparam) { |
| if (!EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num)) { |
| BIO_printf(bio_err, "Error, unable to set DSA prime length\n"); |
| goto end; |
| } |
| } else { |
| if (!EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, num)) { |
| BIO_printf(bio_err, "Error, unable to set DH prime length\n"); |
| goto end; |
| } |
| if (!EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, g)) { |
| BIO_printf(bio_err, "Error, unable to set generator\n"); |
| goto end; |
| } |
| } |
| |
| tmppkey = app_paramgen(ctx, alg); |
| EVP_PKEY_CTX_free(ctx); |
| ctx = NULL; |
| if (dsaparam) { |
| pkey = dsa_to_dh(tmppkey); |
| if (pkey == NULL) |
| goto end; |
| EVP_PKEY_free(tmppkey); |
| } else { |
| pkey = tmppkey; |
| } |
| tmppkey = NULL; |
| } else { |
| OSSL_DECODER_CTX *decoderctx = NULL; |
| const char *keytype = "DH"; |
| int done; |
| |
| in = bio_open_default(infile, 'r', informat); |
| if (in == NULL) |
| goto end; |
| |
| do { |
| /* |
| * We assume we're done unless we explicitly want to retry and set |
| * this to 0 below. |
| */ |
| done = 1; |
| /* |
| * We set NULL for the keytype to allow any key type. We don't know |
| * if we're going to get DH or DHX (or DSA in the event of dsaparam). |
| * We check that we got one of those key types afterwards. |
| */ |
| decoderctx |
| = OSSL_DECODER_CTX_new_for_pkey(&tmppkey, |
| (informat == FORMAT_ASN1) |
| ? "DER" : "PEM", |
| NULL, |
| (informat == FORMAT_ASN1) |
| ? keytype : NULL, |
| OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, |
| NULL, NULL); |
| |
| if (decoderctx != NULL |
| && !OSSL_DECODER_from_bio(decoderctx, in) |
| && informat == FORMAT_ASN1 |
| && strcmp(keytype, "DH") == 0) { |
| /* |
| * When reading DER we explicitly state the expected keytype |
| * because, unlike PEM, there is no header to declare what |
| * the contents of the DER file are. The decoders just try |
| * and guess. Unfortunately with DHX key types they may guess |
| * wrong and think we have a DSA keytype. Therefore we try |
| * both DH and DHX sequentially. |
| */ |
| keytype = "DHX"; |
| /* |
| * BIO_reset() returns 0 for success for file BIOs only!!! |
| * This won't work for stdin (and never has done) |
| */ |
| if (BIO_reset(in) == 0) |
| done = 0; |
| } |
| OSSL_DECODER_CTX_free(decoderctx); |
| } while (!done); |
| if (tmppkey == NULL) { |
| BIO_printf(bio_err, "Error, unable to load parameters\n"); |
| goto end; |
| } |
| |
| if (dsaparam) { |
| if (!EVP_PKEY_is_a(tmppkey, "DSA")) { |
| BIO_printf(bio_err, "Error, unable to load DSA parameters\n"); |
| goto end; |
| } |
| pkey = dsa_to_dh(tmppkey); |
| if (pkey == NULL) |
| goto end; |
| } else { |
| if (!EVP_PKEY_is_a(tmppkey, "DH") |
| && !EVP_PKEY_is_a(tmppkey, "DHX")) { |
| BIO_printf(bio_err, "Error, unable to load DH parameters\n"); |
| goto end; |
| } |
| pkey = tmppkey; |
| tmppkey = NULL; |
| } |
| } |
| |
| if (text) |
| EVP_PKEY_print_params(out, pkey, 4, NULL); |
| |
| if (check) { |
| ctx = EVP_PKEY_CTX_new_from_pkey(NULL, pkey, NULL); |
| if (ctx == NULL) { |
| BIO_printf(bio_err, "Error, failed to check DH parameters\n"); |
| goto end; |
| } |
| if (!EVP_PKEY_param_check(ctx)) { |
| BIO_printf(bio_err, "Error, invalid parameters generated\n"); |
| goto end; |
| } |
| BIO_printf(bio_err, "DH parameters appear to be ok.\n"); |
| } |
| |
| if (!noout) { |
| OSSL_ENCODER_CTX *ectx = |
| OSSL_ENCODER_CTX_new_for_pkey(pkey, |
| OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS, |
| outformat == FORMAT_ASN1 |
| ? "DER" : "PEM", |
| NULL, NULL); |
| |
| if (ectx == NULL || !OSSL_ENCODER_to_bio(ectx, out)) { |
| OSSL_ENCODER_CTX_free(ectx); |
| BIO_printf(bio_err, "Error, unable to write DH parameters\n"); |
| goto end; |
| } |
| OSSL_ENCODER_CTX_free(ectx); |
| } |
| ret = 0; |
| end: |
| if (ret != 0) |
| ERR_print_errors(bio_err); |
| BIO_free(in); |
| BIO_free_all(out); |
| EVP_PKEY_free(pkey); |
| EVP_PKEY_free(tmppkey); |
| EVP_PKEY_CTX_free(ctx); |
| release_engine(e); |
| return ret; |
| } |
| |
| /* |
| * Historically we had the low level call DSA_dup_DH() to do this. |
| * That is now deprecated with no replacement. Since we still need to do this |
| * for backwards compatibility reasons, we do it "manually". |
| */ |
| static EVP_PKEY *dsa_to_dh(EVP_PKEY *dh) |
| { |
| OSSL_PARAM_BLD *tmpl = NULL; |
| OSSL_PARAM *params = NULL; |
| BIGNUM *bn_p = NULL, *bn_q = NULL, *bn_g = NULL; |
| EVP_PKEY_CTX *ctx = NULL; |
| EVP_PKEY *pkey = NULL; |
| |
| if (!EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_P, &bn_p) |
| || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_Q, &bn_q) |
| || !EVP_PKEY_get_bn_param(dh, OSSL_PKEY_PARAM_FFC_G, &bn_g)) { |
| BIO_printf(bio_err, "Error, failed to set DH parameters\n"); |
| goto err; |
| } |
| |
| if ((tmpl = OSSL_PARAM_BLD_new()) == NULL |
| || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, |
| bn_p) |
| || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, |
| bn_q) |
| || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, |
| bn_g) |
| || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) { |
| BIO_printf(bio_err, "Error, failed to set DH parameters\n"); |
| goto err; |
| } |
| |
| ctx = EVP_PKEY_CTX_new_from_name(NULL, "DHX", NULL); |
| if (ctx == NULL |
| || EVP_PKEY_fromdata_init(ctx) <= 0 |
| || EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEY_PARAMETERS, params) <= 0) { |
| BIO_printf(bio_err, "Error, failed to set DH parameters\n"); |
| goto err; |
| } |
| |
| err: |
| EVP_PKEY_CTX_free(ctx); |
| OSSL_PARAM_free(params); |
| OSSL_PARAM_BLD_free(tmpl); |
| BN_free(bn_p); |
| BN_free(bn_q); |
| BN_free(bn_g); |
| return pkey; |
| } |
| |
