254 lines
7.8 KiB
C
254 lines
7.8 KiB
C
/*
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* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/opensslconf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#include "apps.h"
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#include "progs.h"
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include <openssl/x509.h>
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#include <openssl/pem.h>
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static int dsa_cb(int p, int n, BN_GENCB *cb);
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typedef enum OPTION_choice {
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OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
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OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_R_ENUM
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} OPTION_CHOICE;
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const OPTIONS dsaparam_options[] = {
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{"help", OPT_HELP, '-', "Display this summary"},
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{"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
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{"in", OPT_IN, '<', "Input file"},
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{"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
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{"out", OPT_OUT, '>', "Output file"},
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{"text", OPT_TEXT, '-', "Print as text"},
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{"C", OPT_C, '-', "Output C code"},
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{"noout", OPT_NOOUT, '-', "No output"},
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{"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
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OPT_R_OPTIONS,
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#ifndef OPENSSL_NO_ENGINE
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{"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
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#endif
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{NULL}
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};
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int dsaparam_main(int argc, char **argv)
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{
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ENGINE *e = NULL;
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DSA *dsa = NULL;
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BIO *in = NULL, *out = NULL;
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BN_GENCB *cb = NULL;
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int numbits = -1, num = 0, genkey = 0;
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int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
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int ret = 1, i, text = 0, private = 0;
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char *infile = NULL, *outfile = NULL, *prog;
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OPTION_CHOICE o;
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prog = opt_init(argc, argv, dsaparam_options);
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while ((o = opt_next()) != OPT_EOF) {
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switch (o) {
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case OPT_EOF:
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case OPT_ERR:
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opthelp:
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BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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goto end;
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case OPT_HELP:
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opt_help(dsaparam_options);
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ret = 0;
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goto end;
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case OPT_INFORM:
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if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
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goto opthelp;
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break;
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case OPT_IN:
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infile = opt_arg();
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break;
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case OPT_OUTFORM:
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if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
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goto opthelp;
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break;
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case OPT_OUT:
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outfile = opt_arg();
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break;
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case OPT_ENGINE:
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e = setup_engine(opt_arg(), 0);
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break;
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case OPT_TEXT:
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text = 1;
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break;
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case OPT_C:
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C = 1;
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break;
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case OPT_GENKEY:
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genkey = 1;
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break;
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case OPT_R_CASES:
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if (!opt_rand(o))
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goto end;
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break;
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case OPT_NOOUT:
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noout = 1;
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break;
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}
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}
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argc = opt_num_rest();
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argv = opt_rest();
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if (argc == 1) {
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if (!opt_int(argv[0], &num) || num < 0)
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goto end;
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/* generate a key */
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numbits = num;
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}
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private = genkey ? 1 : 0;
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in = bio_open_default(infile, 'r', informat);
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if (in == NULL)
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goto end;
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out = bio_open_owner(outfile, outformat, private);
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if (out == NULL)
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goto end;
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if (numbits > 0) {
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if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
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BIO_printf(bio_err,
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"Warning: It is not recommended to use more than %d bit for DSA keys.\n"
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" Your key size is %d! Larger key size may behave not as expected.\n",
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OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
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cb = BN_GENCB_new();
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if (cb == NULL) {
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BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
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goto end;
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}
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BN_GENCB_set(cb, dsa_cb, bio_err);
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dsa = DSA_new();
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if (dsa == NULL) {
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BIO_printf(bio_err, "Error allocating DSA object\n");
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goto end;
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}
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BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
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num);
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BIO_printf(bio_err, "This could take some time\n");
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if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
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ERR_print_errors(bio_err);
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BIO_printf(bio_err, "Error, DSA key generation failed\n");
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goto end;
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}
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} else if (informat == FORMAT_ASN1) {
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dsa = d2i_DSAparams_bio(in, NULL);
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} else {
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dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
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}
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if (dsa == NULL) {
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BIO_printf(bio_err, "unable to load DSA parameters\n");
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ERR_print_errors(bio_err);
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goto end;
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}
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if (text) {
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DSAparams_print(out, dsa);
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}
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if (C) {
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const BIGNUM *p = NULL, *q = NULL, *g = NULL;
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unsigned char *data;
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int len, bits_p;
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DSA_get0_pqg(dsa, &p, &q, &g);
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len = BN_num_bytes(p);
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bits_p = BN_num_bits(p);
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data = app_malloc(len + 20, "BN space");
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BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
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print_bignum_var(bio_out, p, "dsap", bits_p, data);
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print_bignum_var(bio_out, q, "dsaq", bits_p, data);
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print_bignum_var(bio_out, g, "dsag", bits_p, data);
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BIO_printf(bio_out, " DSA *dsa = DSA_new();\n"
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" BIGNUM *p, *q, *g;\n"
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"\n");
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BIO_printf(bio_out, " if (dsa == NULL)\n"
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" return NULL;\n");
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BIO_printf(bio_out, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
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bits_p, bits_p);
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BIO_printf(bio_out, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
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bits_p, bits_p);
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BIO_printf(bio_out, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
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bits_p, bits_p);
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BIO_printf(bio_out, " DSA_free(dsa);\n"
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" BN_free(p);\n"
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" BN_free(q);\n"
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" BN_free(g);\n"
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" return NULL;\n"
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" }\n"
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" return dsa;\n}\n");
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OPENSSL_free(data);
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}
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if (outformat == FORMAT_ASN1 && genkey)
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noout = 1;
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if (!noout) {
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if (outformat == FORMAT_ASN1)
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i = i2d_DSAparams_bio(out, dsa);
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else
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i = PEM_write_bio_DSAparams(out, dsa);
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if (!i) {
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BIO_printf(bio_err, "unable to write DSA parameters\n");
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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if (genkey) {
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DSA *dsakey;
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if ((dsakey = DSAparams_dup(dsa)) == NULL)
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goto end;
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if (!DSA_generate_key(dsakey)) {
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ERR_print_errors(bio_err);
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DSA_free(dsakey);
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goto end;
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}
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assert(private);
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if (outformat == FORMAT_ASN1)
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i = i2d_DSAPrivateKey_bio(out, dsakey);
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else
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i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
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NULL);
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DSA_free(dsakey);
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}
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ret = 0;
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end:
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BN_GENCB_free(cb);
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BIO_free(in);
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BIO_free_all(out);
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DSA_free(dsa);
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release_engine(e);
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return ret;
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}
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static int dsa_cb(int p, int n, BN_GENCB *cb)
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{
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static const char symbols[] = ".+*\n";
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char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
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BIO_write(BN_GENCB_get_arg(cb), &c, 1);
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(void)BIO_flush(BN_GENCB_get_arg(cb));
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return 1;
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}
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