[thirdparty/openssl.git] / apps / dsaparam.c

/*
 * Copyright 1995-2018 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>
#ifdef OPENSSL_NO_DSA
NON_EMPTY_TRANSLATION_UNIT
#else

# 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/x509.h>
# include <openssl/pem.h>

static int verbose = 0;

static int dsa_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_TEXT, OPT_C,
    OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE,
    OPT_R_ENUM
} OPTION_CHOICE;

const OPTIONS dsaparam_options[] = {
    {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},

    OPT_SECTION("General"),
    {"help", OPT_HELP, '-', "Display this summary"},
# 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 as text"},
    {"C", OPT_C, '-', "Output C code"},
    {"noout", OPT_NOOUT, '-', "No output"},
    {"verbose", OPT_VERBOSE, '-', "Verbose output"},
    {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},

    OPT_R_OPTIONS,

    OPT_PARAMETERS(),
    {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
    {NULL}
};

int dsaparam_main(int argc, char **argv)
{
    ENGINE *e = NULL;
    DSA *dsa = NULL;
    BIO *in = NULL, *out = NULL;
    BN_GENCB *cb = NULL;
    int numbits = -1, num = 0, genkey = 0;
    int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
    int ret = 1, i, text = 0, private = 0;
    char *infile = NULL, *outfile = NULL, *prog;
    OPTION_CHOICE o;

    prog = opt_init(argc, argv, dsaparam_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(dsaparam_options);
            ret = 0;
            goto end;
        case OPT_INFORM:
            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
                goto opthelp;
            break;
        case OPT_IN:
            infile = opt_arg();
            break;
        case OPT_OUTFORM:
            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
                goto opthelp;
            break;
        case OPT_OUT:
            outfile = opt_arg();
            break;
        case OPT_ENGINE:
            e = setup_engine(opt_arg(), 0);
            break;
        case OPT_TEXT:
            text = 1;
            break;
        case OPT_C:
            C = 1;
            break;
        case OPT_GENKEY:
            genkey = 1;
            break;
        case OPT_R_CASES:
            if (!opt_rand(o))
                goto end;
            break;
        case OPT_NOOUT:
            noout = 1;
            break;
        case OPT_VERBOSE:
            verbose = 1;
            break;
        }
    }
    argc = opt_num_rest();
    argv = opt_rest();

    if (argc == 1) {
        if (!opt_int(argv[0], &num) || num < 0)
            goto end;
        /* generate a key */
        numbits = num;
    }
    private = genkey ? 1 : 0;

    in = bio_open_default(infile, 'r', informat);
    if (in == NULL)
        goto end;
    out = bio_open_owner(outfile, outformat, private);
    if (out == NULL)
        goto end;

    if (numbits > 0) {
        if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
            BIO_printf(bio_err,
                       "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
                       "         Your key size is %d! Larger key size may behave not as expected.\n",
                       OPENSSL_DSA_MAX_MODULUS_BITS, numbits);

        cb = BN_GENCB_new();
        if (cb == NULL) {
            BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
            goto end;
        }
        BN_GENCB_set(cb, dsa_cb, bio_err);
        dsa = DSA_new();
        if (dsa == NULL) {
            BIO_printf(bio_err, "Error allocating DSA object\n");
            goto end;
        }
        if (verbose) {
            BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
                       num);
            BIO_printf(bio_err, "This could take some time\n");
        }
        if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
            ERR_print_errors(bio_err);
            BIO_printf(bio_err, "Error, DSA key generation failed\n");
            goto end;
        }
    } else if (informat == FORMAT_ASN1) {
        dsa = d2i_DSAparams_bio(in, NULL);
    } else {
        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;
    }

    if (text) {
        DSAparams_print(out, dsa);
    }

    if (C) {
        const BIGNUM *p = NULL, *q = NULL, *g = NULL;
        unsigned char *data;
        int len, bits_p;

        DSA_get0_pqg(dsa, &p, &q, &g);
        len = BN_num_bytes(p);
        bits_p = BN_num_bits(p);

        data = app_malloc(len + 20, "BN space");

        BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
        print_bignum_var(bio_out, p, "dsap", bits_p, data);
        print_bignum_var(bio_out, q, "dsaq", bits_p, data);
        print_bignum_var(bio_out, g, "dsag", bits_p, data);
        BIO_printf(bio_out, "    DSA *dsa = DSA_new();\n"
                            "    BIGNUM *p, *q, *g;\n"
                            "\n");
        BIO_printf(bio_out, "    if (dsa == NULL)\n"
                            "        return NULL;\n");
        BIO_printf(bio_out, "    if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
                   bits_p, bits_p);
        BIO_printf(bio_out, "                           q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
                   bits_p, bits_p);
        BIO_printf(bio_out, "                           g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
                   bits_p, bits_p);
        BIO_printf(bio_out, "        DSA_free(dsa);\n"
                            "        BN_free(p);\n"
                            "        BN_free(q);\n"
                            "        BN_free(g);\n"
                            "        return NULL;\n"
                            "    }\n"
                            "    return dsa;\n}\n");
        OPENSSL_free(data);
    }

    if (outformat == FORMAT_ASN1 && genkey)
        noout = 1;

    if (!noout) {
        if (outformat == FORMAT_ASN1)
            i = i2d_DSAparams_bio(out, dsa);
        else
            i = PEM_write_bio_DSAparams(out, dsa);
        if (!i) {
            BIO_printf(bio_err, "unable to write DSA parameters\n");
            ERR_print_errors(bio_err);
            goto end;
        }
    }
    if (genkey) {
        DSA *dsakey;

        if ((dsakey = DSAparams_dup(dsa)) == NULL)
            goto end;
        if (!DSA_generate_key(dsakey)) {
            ERR_print_errors(bio_err);
            DSA_free(dsakey);
            goto end;
        }
        assert(private);
        if (outformat == FORMAT_ASN1)
            i = i2d_DSAPrivateKey_bio(out, dsakey);
        else
            i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
                                            NULL);
        DSA_free(dsakey);
    }
    ret = 0;
 end:
    BN_GENCB_free(cb);
    BIO_free(in);
    BIO_free_all(out);
    DSA_free(dsa);
    release_engine(e);
    return ret;
}

static int dsa_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] : '?';

    if (!verbose)
        return 1;

    BIO_write(BN_GENCB_get_arg(cb), &c, 1);
    (void)BIO_flush(BN_GENCB_get_arg(cb));
    return 1;
}
#endif
Commit	Line	Data
846e33c7	1	/*
6738bf14	2	* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
d02b48c6	3	*
dffa7520	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
846e33c7 RS	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
d02b48c6 RE	8	*/
d02b48c6 RE	9
effaf4de RS	10	#include <openssl/opensslconf.h>
	11	#ifdef OPENSSL_NO_DSA
	12	NON_EMPTY_TRANSLATION_UNIT
	13	#else
5daec7ea	14
0f113f3e MC	15	# include <stdio.h>
	16	# include <stdlib.h>
	17	# include <time.h>
	18	# include <string.h>
	19	# include "apps.h"
dab2cd68	20	# include "progs.h"
0f113f3e MC	21	# include <openssl/bio.h>
	22	# include <openssl/err.h>
	23	# include <openssl/bn.h>
	24	# include <openssl/dsa.h>
	25	# include <openssl/x509.h>
	26	# include <openssl/pem.h>
	27
b6a07f67 PP	28	static int verbose = 0;
b6a07f67 PP	29
6d23cf97	30	static int dsa_cb(int p, int n, BN_GENCB *cb);
667ac4ec	31
7e1b7485 RS	32	typedef enum OPTION_choice {
	33	OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
	34	OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
b6a07f67 PP	35	OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE,
b6a07f67 PP	36	OPT_R_ENUM
7e1b7485 RS	37	} OPTION_CHOICE;
7e1b7485 RS	38
44c83ebd	39	const OPTIONS dsaparam_options[] = {
92de469f RS	40	{OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
92de469f RS	41
5388f986	42	OPT_SECTION("General"),
7e1b7485	43	{"help", OPT_HELP, '-', "Display this summary"},
5388f986 RS	44	# ifndef OPENSSL_NO_ENGINE
	45	{"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
	46	# endif
	47
	48	OPT_SECTION("Input"),
7e1b7485	49	{"in", OPT_IN, '<', "Input file"},
5388f986 RS	50	{"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
	51
	52	OPT_SECTION("Output"),
7e1b7485	53	{"out", OPT_OUT, '>', "Output file"},
5388f986	54	{"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
7e1b7485 RS	55	{"text", OPT_TEXT, '-', "Print as text"},
	56	{"C", OPT_C, '-', "Output C code"},
	57	{"noout", OPT_NOOUT, '-', "No output"},
5388f986	58	{"verbose", OPT_VERBOSE, '-', "Verbose output"},
7e1b7485	59	{"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
5388f986	60
3ee1eac2	61	OPT_R_OPTIONS,
92de469f RS	62
	63	OPT_PARAMETERS(),
	64	{"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
7e1b7485 RS	65	{NULL}
7e1b7485 RS	66	};
667ac4ec	67
7e1b7485	68	int dsaparam_main(int argc, char **argv)
0f113f3e	69	{
dd1abd44	70	ENGINE *e = NULL;
0f113f3e	71	DSA *dsa = NULL;
0f113f3e	72	BIO in = NULL, out = NULL;
0f113f3e	73	BN_GENCB *cb = NULL;
3ee1eac2	74	int numbits = -1, num = 0, genkey = 0;
3b061a00 RS	75	int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
3b061a00 RS	76	int ret = 1, i, text = 0, private = 0;
3ee1eac2	77	char infile = NULL, outfile = NULL, *prog;
7e1b7485 RS	78	OPTION_CHOICE o;
	79
	80	prog = opt_init(argc, argv, dsaparam_options);
	81	while ((o = opt_next()) != OPT_EOF) {
	82	switch (o) {
	83	case OPT_EOF:
	84	case OPT_ERR:
	85	opthelp:
	86	BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
	87	goto end;
	88	case OPT_HELP:
	89	opt_help(dsaparam_options);
	90	ret = 0;
	91	goto end;
	92	case OPT_INFORM:
	93	if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
	94	goto opthelp;
	95	break;
	96	case OPT_IN:
	97	infile = opt_arg();
	98	break;
	99	case OPT_OUTFORM:
	100	if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
	101	goto opthelp;
	102	break;
	103	case OPT_OUT:
	104	outfile = opt_arg();
	105	break;
	106	case OPT_ENGINE:
dd1abd44	107	e = setup_engine(opt_arg(), 0);
7e1b7485	108	break;
7e1b7485	109	case OPT_TEXT:
0f113f3e	110	text = 1;
7e1b7485 RS	111	break;
7e1b7485 RS	112	case OPT_C:
0f113f3e	113	C = 1;
7e1b7485 RS	114	break;
7e1b7485 RS	115	case OPT_GENKEY:
3ee1eac2	116	genkey = 1;
7e1b7485	117	break;
3ee1eac2 RS	118	case OPT_R_CASES:
	119	if (!opt_rand(o))
	120	goto end;
7e1b7485 RS	121	break;
7e1b7485 RS	122	case OPT_NOOUT:
0f113f3e	123	noout = 1;
7e1b7485	124	break;
b6a07f67 PP	125	case OPT_VERBOSE:
	126	verbose = 1;
	127	break;
0f113f3e	128	}
0f113f3e	129	}
7e1b7485 RS	130	argc = opt_num_rest();
7e1b7485 RS	131	argv = opt_rest();
0f113f3e	132
7e1b7485	133	if (argc == 1) {
bd4850df	134	if (!opt_int(argv[0], &num) \|\| num < 0)
7e1b7485 RS	135	goto end;
	136	/* generate a key */
	137	numbits = num;
0f113f3e	138	}
3b061a00	139	private = genkey ? 1 : 0;
0f113f3e	140
bdd58d98	141	in = bio_open_default(infile, 'r', informat);
7e1b7485 RS	142	if (in == NULL)
7e1b7485 RS	143	goto end;
bdd58d98	144	out = bio_open_owner(outfile, outformat, private);
7e1b7485	145	if (out == NULL)
0f113f3e	146	goto end;
0f113f3e	147
0f113f3e	148	if (numbits > 0) {
0336df2f GS	149	if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
	150	BIO_printf(bio_err,
	151	"Warning: It is not recommended to use more than %d bit for DSA keys.\n"
	152	" Your key size is %d! Larger key size may behave not as expected.\n",
	153	OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
	154
0f113f3e	155	cb = BN_GENCB_new();
96487cdd	156	if (cb == NULL) {
0f113f3e MC	157	BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
	158	goto end;
	159	}
	160	BN_GENCB_set(cb, dsa_cb, bio_err);
0f113f3e	161	dsa = DSA_new();
96487cdd	162	if (dsa == NULL) {
0f113f3e MC	163	BIO_printf(bio_err, "Error allocating DSA object\n");
	164	goto end;
	165	}
b6a07f67 PP	166	if (verbose) {
	167	BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
	168	num);
	169	BIO_printf(bio_err, "This could take some time\n");
	170	}
0f113f3e	171	if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) {
0f113f3e MC	172	ERR_print_errors(bio_err);
	173	BIO_printf(bio_err, "Error, DSA key generation failed\n");
	174	goto end;
	175	}
2234212c	176	} else if (informat == FORMAT_ASN1) {
0f113f3e	177	dsa = d2i_DSAparams_bio(in, NULL);
2234212c	178	} else {
0f113f3e	179	dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
2234212c	180	}
0f113f3e MC	181	if (dsa == NULL) {
	182	BIO_printf(bio_err, "unable to load DSA parameters\n");
	183	ERR_print_errors(bio_err);
	184	goto end;
	185	}
	186
	187	if (text) {
	188	DSAparams_print(out, dsa);
	189	}
	190
	191	if (C) {
2ac6115d	192	const BIGNUM p = NULL, q = NULL, *g = NULL;
ae6c553e	193	unsigned char *data;
6e9fa57c MC	194	int len, bits_p;
	195
	196	DSA_get0_pqg(dsa, &p, &q, &g);
	197	len = BN_num_bytes(p);
	198	bits_p = BN_num_bits(p);
	199
ae6c553e	200	data = app_malloc(len + 20, "BN space");
0f113f3e	201
d6b50b6e	202	BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
708c28f2 AP	203	print_bignum_var(bio_out, p, "dsap", bits_p, data);
	204	print_bignum_var(bio_out, q, "dsaq", bits_p, data);
	205	print_bignum_var(bio_out, g, "dsag", bits_p, data);
7e1b7485	206	BIO_printf(bio_out, " DSA *dsa = DSA_new();\n"
708c28f2	207	" BIGNUM p, q, *g;\n"
7e1b7485 RS	208	"\n");
	209	BIO_printf(bio_out, " if (dsa == NULL)\n"
	210	" return NULL;\n");
708c28f2 AP	211	BIO_printf(bio_out, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
	212	bits_p, bits_p);
	213	BIO_printf(bio_out, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
	214	bits_p, bits_p);
	215	BIO_printf(bio_out, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
	216	bits_p, bits_p);
	217	BIO_printf(bio_out, " DSA_free(dsa);\n"
	218	" BN_free(p);\n"
	219	" BN_free(q);\n"
	220	" BN_free(g);\n"
7e1b7485 RS	221	" return NULL;\n"
7e1b7485 RS	222	" }\n"
708c28f2	223	" return dsa;\n}\n");
a855d1a1	224	OPENSSL_free(data);
0f113f3e MC	225	}
0f113f3e MC	226
52814352 BE	227	if (outformat == FORMAT_ASN1 && genkey)
	228	noout = 1;
	229
0f113f3e MC	230	if (!noout) {
	231	if (outformat == FORMAT_ASN1)
	232	i = i2d_DSAparams_bio(out, dsa);
7e1b7485	233	else
0f113f3e	234	i = PEM_write_bio_DSAparams(out, dsa);
0f113f3e MC	235	if (!i) {
	236	BIO_printf(bio_err, "unable to write DSA parameters\n");
	237	ERR_print_errors(bio_err);
	238	goto end;
	239	}
	240	}
	241	if (genkey) {
	242	DSA *dsakey;
	243
0f113f3e MC	244	if ((dsakey = DSAparams_dup(dsa)) == NULL)
0f113f3e MC	245	goto end;
0f113f3e MC	246	if (!DSA_generate_key(dsakey)) {
	247	ERR_print_errors(bio_err);
	248	DSA_free(dsakey);
	249	goto end;
	250	}
3b061a00	251	assert(private);
0f113f3e MC	252	if (outformat == FORMAT_ASN1)
0f113f3e MC	253	i = i2d_DSAPrivateKey_bio(out, dsakey);
7e1b7485	254	else
0f113f3e MC	255	i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
0f113f3e MC	256	NULL);
0f113f3e MC	257	DSA_free(dsakey);
0f113f3e MC	258	}
0f113f3e MC	259	ret = 0;
0f113f3e MC	260	end:
23a1d5e9	261	BN_GENCB_free(cb);
ca3a82c3 RS	262	BIO_free(in);
ca3a82c3 RS	263	BIO_free_all(out);
d6407083	264	DSA_free(dsa);
dd1abd44	265	release_engine(e);
26a7d938	266	return ret;
0f113f3e	267	}
d02b48c6	268
6d23cf97	269	static int dsa_cb(int p, int n, BN_GENCB *cb)
0f113f3e	270	{
201b305a BB	271	static const char symbols[] = ".+*\n";
201b305a BB	272	char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';
0f113f3e	273
b6a07f67 PP	274	if (!verbose)
	275	return 1;
	276
0f113f3e MC	277	BIO_write(BN_GENCB_get_arg(cb), &c, 1);
0f113f3e MC	278	(void)BIO_flush(BN_GENCB_get_arg(cb));
0f113f3e MC	279	return 1;
0f113f3e MC	280	}
f5d7a031	281	#endif