| /* |
| * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (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/dh.h> |
| #include <openssl/x509.h> |
| #include <openssl/pem.h> |
| |
| #ifndef OPENSSL_NO_DSA |
| # include <openssl/dsa.h> |
| #endif |
| |
| #define DEFBITS 2048 |
| |
| static int dh_cb(int p, int n, BN_GENCB *cb); |
| |
| typedef enum OPTION_choice { |
| OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, |
| OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, |
| OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT, |
| OPT_DSAPARAM, OPT_C, OPT_2, OPT_5, |
| OPT_R_ENUM |
| } OPTION_CHOICE; |
| |
| const OPTIONS dhparam_options[] = { |
| {OPT_HELP_STR, 1, '-', "Usage: %s [flags] [numbits]\n"}, |
| {OPT_HELP_STR, 1, '-', "Valid options are:\n"}, |
| {"help", OPT_HELP, '-', "Display this summary"}, |
| {"in", OPT_IN, '<', "Input file"}, |
| {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"}, |
| {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"}, |
| {"out", OPT_OUT, '>', "Output file"}, |
| {"check", OPT_CHECK, '-', "Check the DH parameters"}, |
| {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"}, |
| {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"}, |
| OPT_R_OPTIONS, |
| {"C", OPT_C, '-', "Print C code"}, |
| {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"}, |
| {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"}, |
| #ifndef OPENSSL_NO_DSA |
| {"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 |
| {NULL} |
| }; |
| |
| int dhparam_main(int argc, char **argv) |
| { |
| BIO *in = NULL, *out = NULL; |
| DH *dh = NULL; |
| char *infile = NULL, *outfile = NULL, *prog; |
| ENGINE *e = NULL; |
| #ifndef OPENSSL_NO_DSA |
| int dsaparam = 0; |
| #endif |
| int i, text = 0, C = 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: |
| #ifndef OPENSSL_NO_DSA |
| dsaparam = 1; |
| #endif |
| break; |
| case OPT_C: |
| C = 1; |
| break; |
| case OPT_2: |
| g = 2; |
| break; |
| case OPT_5: |
| g = 5; |
| break; |
| case OPT_NOOUT: |
| noout = 1; |
| break; |
| case OPT_R_CASES: |
| if (!opt_rand(o)) |
| goto end; |
| break; |
| } |
| } |
| argc = opt_num_rest(); |
| argv = opt_rest(); |
| |
| if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0)) |
| goto end; |
| |
| if (g && !num) |
| num = DEFBITS; |
| |
| #ifndef OPENSSL_NO_DSA |
| if (dsaparam && g) { |
| BIO_printf(bio_err, |
| "generator may not be chosen for DSA parameters\n"); |
| goto end; |
| } |
| #endif |
| |
| out = bio_open_default(outfile, 'w', outformat); |
| if (out == NULL) |
| goto end; |
| |
| /* DH parameters */ |
| if (num && !g) |
| g = 2; |
| |
| if (num) { |
| |
| BN_GENCB *cb; |
| cb = BN_GENCB_new(); |
| if (cb == NULL) { |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| |
| BN_GENCB_set(cb, dh_cb, bio_err); |
| |
| #ifndef OPENSSL_NO_DSA |
| if (dsaparam) { |
| DSA *dsa = DSA_new(); |
| |
| BIO_printf(bio_err, |
| "Generating DSA parameters, %d bit long prime\n", num); |
| if (dsa == NULL |
| || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, |
| cb)) { |
| DSA_free(dsa); |
| BN_GENCB_free(cb); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| |
| dh = DSA_dup_DH(dsa); |
| DSA_free(dsa); |
| if (dh == NULL) { |
| BN_GENCB_free(cb); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } else |
| #endif |
| { |
| dh = DH_new(); |
| BIO_printf(bio_err, |
| "Generating DH parameters, %d bit long safe prime, generator %d\n", |
| num, g); |
| BIO_printf(bio_err, "This is going to take a long time\n"); |
| if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) { |
| BN_GENCB_free(cb); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } |
| |
| BN_GENCB_free(cb); |
| } else { |
| |
| in = bio_open_default(infile, 'r', informat); |
| if (in == NULL) |
| goto end; |
| |
| #ifndef OPENSSL_NO_DSA |
| if (dsaparam) { |
| DSA *dsa; |
| |
| if (informat == FORMAT_ASN1) |
| dsa = d2i_DSAparams_bio(in, NULL); |
| else /* informat == FORMAT_PEM */ |
| dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL); |
| |
| if (dsa == NULL) { |
| BIO_printf(bio_err, "unable to load DSA parameters\n"); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| |
| dh = DSA_dup_DH(dsa); |
| DSA_free(dsa); |
| if (dh == NULL) { |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } else |
| #endif |
| { |
| if (informat == FORMAT_ASN1) { |
| /* |
| * We have no PEM header to determine what type of DH params it |
| * is. We'll just try both. |
| */ |
| dh = d2i_DHparams_bio(in, NULL); |
| /* BIO_reset() returns 0 for success for file BIOs only!!! */ |
| if (dh == NULL && BIO_reset(in) == 0) |
| dh = d2i_DHxparams_bio(in, NULL); |
| } else { |
| /* informat == FORMAT_PEM */ |
| dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL); |
| } |
| |
| if (dh == NULL) { |
| BIO_printf(bio_err, "unable to load DH parameters\n"); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } |
| |
| /* dh != NULL */ |
| } |
| |
| if (text) { |
| DHparams_print(out, dh); |
| } |
| |
| if (check) { |
| if (!DH_check(dh, &i)) { |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| if (i & DH_CHECK_P_NOT_PRIME) |
| BIO_printf(bio_err, "WARNING: p value is not prime\n"); |
| if (i & DH_CHECK_P_NOT_SAFE_PRIME) |
| BIO_printf(bio_err, "WARNING: p value is not a safe prime\n"); |
| if (i & DH_CHECK_Q_NOT_PRIME) |
| BIO_printf(bio_err, "WARNING: q value is not a prime\n"); |
| if (i & DH_CHECK_INVALID_Q_VALUE) |
| BIO_printf(bio_err, "WARNING: q value is invalid\n"); |
| if (i & DH_CHECK_INVALID_J_VALUE) |
| BIO_printf(bio_err, "WARNING: j value is invalid\n"); |
| if (i & DH_UNABLE_TO_CHECK_GENERATOR) |
| BIO_printf(bio_err, |
| "WARNING: unable to check the generator value\n"); |
| if (i & DH_NOT_SUITABLE_GENERATOR) |
| BIO_printf(bio_err, "WARNING: the g value is not a generator\n"); |
| if (i == 0) |
| BIO_printf(bio_err, "DH parameters appear to be ok.\n"); |
| if (num != 0 && i != 0) { |
| /* |
| * We have generated parameters but DH_check() indicates they are |
| * invalid! This should never happen! |
| */ |
| BIO_printf(bio_err, "ERROR: Invalid parameters generated\n"); |
| goto end; |
| } |
| } |
| if (C) { |
| unsigned char *data; |
| int len, bits; |
| const BIGNUM *pbn, *gbn; |
| |
| len = DH_size(dh); |
| bits = DH_bits(dh); |
| DH_get0_pqg(dh, &pbn, NULL, &gbn); |
| data = app_malloc(len, "print a BN"); |
| |
| BIO_printf(out, "static DH *get_dh%d(void)\n{\n", bits); |
| print_bignum_var(out, pbn, "dhp", bits, data); |
| print_bignum_var(out, gbn, "dhg", bits, data); |
| BIO_printf(out, " DH *dh = DH_new();\n" |
| " BIGNUM *p, *g;\n" |
| "\n" |
| " if (dh == NULL)\n" |
| " return NULL;\n"); |
| BIO_printf(out, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n", |
| bits, bits); |
| BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n", |
| bits, bits); |
| BIO_printf(out, " if (p == NULL || g == NULL\n" |
| " || !DH_set0_pqg(dh, p, NULL, g)) {\n" |
| " DH_free(dh);\n" |
| " BN_free(p);\n" |
| " BN_free(g);\n" |
| " return NULL;\n" |
| " }\n"); |
| if (DH_get_length(dh) > 0) |
| BIO_printf(out, |
| " if (!DH_set_length(dh, %ld)) {\n" |
| " DH_free(dh);\n" |
| " return NULL;\n" |
| " }\n", DH_get_length(dh)); |
| BIO_printf(out, " return dh;\n}\n"); |
| OPENSSL_free(data); |
| } |
| |
| if (!noout) { |
| const BIGNUM *q; |
| DH_get0_pqg(dh, NULL, &q, NULL); |
| if (outformat == FORMAT_ASN1) { |
| if (q != NULL) |
| i = i2d_DHxparams_bio(out, dh); |
| else |
| i = i2d_DHparams_bio(out, dh); |
| } else if (q != NULL) { |
| i = PEM_write_bio_DHxparams(out, dh); |
| } else { |
| i = PEM_write_bio_DHparams(out, dh); |
| } |
| if (!i) { |
| BIO_printf(bio_err, "unable to write DH parameters\n"); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } |
| ret = 0; |
| end: |
| BIO_free(in); |
| BIO_free_all(out); |
| DH_free(dh); |
| release_engine(e); |
| return ret; |
| } |
| |
| static int dh_cb(int p, int n, BN_GENCB *cb) |
| { |
| static const char symbols[] = ".+*\n"; |
| char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?'; |
| |
| BIO_write(BN_GENCB_get_arg(cb), &c, 1); |
| (void)BIO_flush(BN_GENCB_get_arg(cb)); |
| return 1; |
| } |