1/*
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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 <openssl/opensslconf.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <time.h>
15#include "apps.h"
16#include "progs.h"
17#include <openssl/bio.h>
18#include <openssl/err.h>
19#include <openssl/dsa.h>
20#include <openssl/evp.h>
21#include <openssl/x509.h>
22#include <openssl/pem.h>
23#include <openssl/bn.h>
24
25typedef enum OPTION_choice {
26    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
27    OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_ENGINE,
28    /* Do not change the order here; see case statements below */
29    OPT_PVK_NONE, OPT_PVK_WEAK, OPT_PVK_STRONG,
30    OPT_NOOUT, OPT_TEXT, OPT_MODULUS, OPT_PUBIN,
31    OPT_PUBOUT, OPT_CIPHER, OPT_PASSIN, OPT_PASSOUT
32} OPTION_CHOICE;
33
34const OPTIONS dsa_options[] = {
35    {"help", OPT_HELP, '-', "Display this summary"},
36    {"inform", OPT_INFORM, 'f', "Input format, DER PEM PVK"},
37    {"outform", OPT_OUTFORM, 'f', "Output format, DER PEM PVK"},
38    {"in", OPT_IN, 's', "Input key"},
39    {"out", OPT_OUT, '>', "Output file"},
40    {"noout", OPT_NOOUT, '-', "Don't print key out"},
41    {"text", OPT_TEXT, '-', "Print the key in text"},
42    {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
43    {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
44    {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
45    {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
46    {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
47    {"", OPT_CIPHER, '-', "Any supported cipher"},
48#ifndef OPENSSL_NO_RC4
49    {"pvk-strong", OPT_PVK_STRONG, '-', "Enable 'Strong' PVK encoding level (default)"},
50    {"pvk-weak", OPT_PVK_WEAK, '-', "Enable 'Weak' PVK encoding level"},
51    {"pvk-none", OPT_PVK_NONE, '-', "Don't enforce PVK encoding"},
52#endif
53#ifndef OPENSSL_NO_ENGINE
54    {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
55#endif
56    {NULL}
57};
58
59int dsa_main(int argc, char **argv)
60{
61    BIO *out = NULL;
62    DSA *dsa = NULL;
63    ENGINE *e = NULL;
64    const EVP_CIPHER *enc = NULL;
65    char *infile = NULL, *outfile = NULL, *prog;
66    char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;
67    OPTION_CHOICE o;
68    int informat = FORMAT_PEM, outformat = FORMAT_PEM, text = 0, noout = 0;
69    int i, modulus = 0, pubin = 0, pubout = 0, ret = 1;
70#ifndef OPENSSL_NO_RC4
71    int pvk_encr = 2;
72#endif
73    int private = 0;
74
75    prog = opt_init(argc, argv, dsa_options);
76    while ((o = opt_next()) != OPT_EOF) {
77        switch (o) {
78        case OPT_EOF:
79        case OPT_ERR:
80 opthelp:
81            ret = 0;
82            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
83            goto end;
84        case OPT_HELP:
85            opt_help(dsa_options);
86            ret = 0;
87            goto end;
88        case OPT_INFORM:
89            if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
90                goto opthelp;
91            break;
92        case OPT_IN:
93            infile = opt_arg();
94            break;
95        case OPT_OUTFORM:
96            if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
97                goto opthelp;
98            break;
99        case OPT_OUT:
100            outfile = opt_arg();
101            break;
102        case OPT_ENGINE:
103            e = setup_engine(opt_arg(), 0);
104            break;
105        case OPT_PASSIN:
106            passinarg = opt_arg();
107            break;
108        case OPT_PASSOUT:
109            passoutarg = opt_arg();
110            break;
111        case OPT_PVK_STRONG:    /* pvk_encr:= 2 */
112        case OPT_PVK_WEAK:      /* pvk_encr:= 1 */
113        case OPT_PVK_NONE:      /* pvk_encr:= 0 */
114#ifndef OPENSSL_NO_RC4
115            pvk_encr = (o - OPT_PVK_NONE);
116#endif
117            break;
118        case OPT_NOOUT:
119            noout = 1;
120            break;
121        case OPT_TEXT:
122            text = 1;
123            break;
124        case OPT_MODULUS:
125            modulus = 1;
126            break;
127        case OPT_PUBIN:
128            pubin = 1;
129            break;
130        case OPT_PUBOUT:
131            pubout = 1;
132            break;
133        case OPT_CIPHER:
134            if (!opt_cipher(opt_unknown(), &enc))
135                goto end;
136            break;
137        }
138    }
139    argc = opt_num_rest();
140    if (argc != 0)
141        goto opthelp;
142
143    private = pubin || pubout ? 0 : 1;
144    if (text && !pubin)
145        private = 1;
146
147    if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
148        BIO_printf(bio_err, "Error getting passwords\n");
149        goto end;
150    }
151
152    BIO_printf(bio_err, "read DSA key\n");
153    {
154        EVP_PKEY *pkey;
155
156        if (pubin)
157            pkey = load_pubkey(infile, informat, 1, passin, e, "Public Key");
158        else
159            pkey = load_key(infile, informat, 1, passin, e, "Private Key");
160
161        if (pkey != NULL) {
162            dsa = EVP_PKEY_get1_DSA(pkey);
163            EVP_PKEY_free(pkey);
164        }
165    }
166    if (dsa == NULL) {
167        BIO_printf(bio_err, "unable to load Key\n");
168        ERR_print_errors(bio_err);
169        goto end;
170    }
171
172    out = bio_open_owner(outfile, outformat, private);
173    if (out == NULL)
174        goto end;
175
176    if (text) {
177        assert(pubin || private);
178        if (!DSA_print(out, dsa, 0)) {
179            perror(outfile);
180            ERR_print_errors(bio_err);
181            goto end;
182        }
183    }
184
185    if (modulus) {
186        const BIGNUM *pub_key = NULL;
187        DSA_get0_key(dsa, &pub_key, NULL);
188        BIO_printf(out, "Public Key=");
189        BN_print(out, pub_key);
190        BIO_printf(out, "\n");
191    }
192
193    if (noout) {
194        ret = 0;
195        goto end;
196    }
197    BIO_printf(bio_err, "writing DSA key\n");
198    if (outformat == FORMAT_ASN1) {
199        if (pubin || pubout) {
200            i = i2d_DSA_PUBKEY_bio(out, dsa);
201        } else {
202            assert(private);
203            i = i2d_DSAPrivateKey_bio(out, dsa);
204        }
205    } else if (outformat == FORMAT_PEM) {
206        if (pubin || pubout) {
207            i = PEM_write_bio_DSA_PUBKEY(out, dsa);
208        } else {
209            assert(private);
210            i = PEM_write_bio_DSAPrivateKey(out, dsa, enc,
211                                            NULL, 0, NULL, passout);
212        }
213#ifndef OPENSSL_NO_RSA
214    } else if (outformat == FORMAT_MSBLOB || outformat == FORMAT_PVK) {
215        EVP_PKEY *pk;
216        pk = EVP_PKEY_new();
217        if (pk == NULL)
218           goto end;
219
220        EVP_PKEY_set1_DSA(pk, dsa);
221        if (outformat == FORMAT_PVK) {
222            if (pubin) {
223                BIO_printf(bio_err, "PVK form impossible with public key input\n");
224                EVP_PKEY_free(pk);
225                goto end;
226            }
227            assert(private);
228# ifdef OPENSSL_NO_RC4
229            BIO_printf(bio_err, "PVK format not supported\n");
230            EVP_PKEY_free(pk);
231            goto end;
232# else
233            i = i2b_PVK_bio(out, pk, pvk_encr, 0, passout);
234# endif
235        } else if (pubin || pubout) {
236            i = i2b_PublicKey_bio(out, pk);
237        } else {
238            assert(private);
239            i = i2b_PrivateKey_bio(out, pk);
240        }
241        EVP_PKEY_free(pk);
242#endif
243    } else {
244        BIO_printf(bio_err, "bad output format specified for outfile\n");
245        goto end;
246    }
247    if (i <= 0) {
248        BIO_printf(bio_err, "unable to write private key\n");
249        ERR_print_errors(bio_err);
250        goto end;
251    }
252    ret = 0;
253 end:
254    BIO_free_all(out);
255    DSA_free(dsa);
256    release_engine(e);
257    OPENSSL_free(passin);
258    OPENSSL_free(passout);
259    return ret;
260}
261