dsa_pmeth.c revision 296341 
1/*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 2006.
4 */
5/* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/asn1t.h>
62#include <openssl/x509.h>
63#include <openssl/evp.h>
64#include <openssl/bn.h>
65#include "evp_locl.h"
66#include "dsa_locl.h"
67
68/* DSA pkey context structure */
69
70typedef struct {
71    /* Parameter gen parameters */
72    int nbits;                  /* size of p in bits (default: 1024) */
73    int qbits;                  /* size of q in bits (default: 160) */
74    const EVP_MD *pmd;          /* MD for parameter generation */
75    /* Keygen callback info */
76    int gentmp[2];
77    /* message digest */
78    const EVP_MD *md;           /* MD for the signature */
79} DSA_PKEY_CTX;
80
81static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
82{
83    DSA_PKEY_CTX *dctx;
84    dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
85    if (!dctx)
86        return 0;
87    dctx->nbits = 1024;
88    dctx->qbits = 160;
89    dctx->pmd = NULL;
90    dctx->md = NULL;
91
92    ctx->data = dctx;
93    ctx->keygen_info = dctx->gentmp;
94    ctx->keygen_info_count = 2;
95
96    return 1;
97}
98
99static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
100{
101    DSA_PKEY_CTX *dctx, *sctx;
102    if (!pkey_dsa_init(dst))
103        return 0;
104    sctx = src->data;
105    dctx = dst->data;
106    dctx->nbits = sctx->nbits;
107    dctx->qbits = sctx->qbits;
108    dctx->pmd = sctx->pmd;
109    dctx->md = sctx->md;
110    return 1;
111}
112
113static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
114{
115    DSA_PKEY_CTX *dctx = ctx->data;
116    if (dctx)
117        OPENSSL_free(dctx);
118}
119
120static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
121                         size_t *siglen, const unsigned char *tbs,
122                         size_t tbslen)
123{
124    int ret, type;
125    unsigned int sltmp;
126    DSA_PKEY_CTX *dctx = ctx->data;
127    DSA *dsa = ctx->pkey->pkey.dsa;
128
129    if (dctx->md)
130        type = EVP_MD_type(dctx->md);
131    else
132        type = NID_sha1;
133
134    ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
135
136    if (ret <= 0)
137        return ret;
138    *siglen = sltmp;
139    return 1;
140}
141
142static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
143                           const unsigned char *sig, size_t siglen,
144                           const unsigned char *tbs, size_t tbslen)
145{
146    int ret, type;
147    DSA_PKEY_CTX *dctx = ctx->data;
148    DSA *dsa = ctx->pkey->pkey.dsa;
149
150    if (dctx->md)
151        type = EVP_MD_type(dctx->md);
152    else
153        type = NID_sha1;
154
155    ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
156
157    return ret;
158}
159
160static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
161{
162    DSA_PKEY_CTX *dctx = ctx->data;
163    switch (type) {
164    case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
165        if (p1 < 256)
166            return -2;
167        dctx->nbits = p1;
168        return 1;
169
170    case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
171        if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
172            return -2;
173        dctx->qbits = p1;
174        return 1;
175
176    case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
177        if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
178            EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
179            EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
180            DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
181            return 0;
182        }
183        dctx->md = p2;
184        return 1;
185
186    case EVP_PKEY_CTRL_MD:
187        if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
188            EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
189            EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
190            EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
191            EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
192            EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
193            EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
194            DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
195            return 0;
196        }
197        dctx->md = p2;
198        return 1;
199
200    case EVP_PKEY_CTRL_DIGESTINIT:
201    case EVP_PKEY_CTRL_PKCS7_SIGN:
202    case EVP_PKEY_CTRL_CMS_SIGN:
203        return 1;
204
205    case EVP_PKEY_CTRL_PEER_KEY:
206        DSAerr(DSA_F_PKEY_DSA_CTRL,
207               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
208        return -2;
209    default:
210        return -2;
211
212    }
213}
214
215static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
216                             const char *type, const char *value)
217{
218    if (!strcmp(type, "dsa_paramgen_bits")) {
219        int nbits;
220        nbits = atoi(value);
221        return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
222    }
223    if (!strcmp(type, "dsa_paramgen_q_bits")) {
224        int qbits = atoi(value);
225        return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
226                                 EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
227                                 NULL);
228    }
229    if (!strcmp(type, "dsa_paramgen_md")) {
230        return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
231                                 EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
232                                 (void *)EVP_get_digestbyname(value));
233    }
234    return -2;
235}
236
237static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
238{
239    DSA *dsa = NULL;
240    DSA_PKEY_CTX *dctx = ctx->data;
241    BN_GENCB *pcb, cb;
242    int ret;
243    if (ctx->pkey_gencb) {
244        pcb = &cb;
245        evp_pkey_set_cb_translate(pcb, ctx);
246    } else
247        pcb = NULL;
248    dsa = DSA_new();
249    if (!dsa)
250        return 0;
251    ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
252                               NULL, 0, NULL, NULL, NULL, pcb);
253    if (ret)
254        EVP_PKEY_assign_DSA(pkey, dsa);
255    else
256        DSA_free(dsa);
257    return ret;
258}
259
260static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
261{
262    DSA *dsa = NULL;
263    if (ctx->pkey == NULL) {
264        DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
265        return 0;
266    }
267    dsa = DSA_new();
268    if (!dsa)
269        return 0;
270    EVP_PKEY_assign_DSA(pkey, dsa);
271    /* Note: if error return, pkey is freed by parent routine */
272    if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
273        return 0;
274    return DSA_generate_key(pkey->pkey.dsa);
275}
276
277const EVP_PKEY_METHOD dsa_pkey_meth = {
278    EVP_PKEY_DSA,
279    EVP_PKEY_FLAG_AUTOARGLEN,
280    pkey_dsa_init,
281    pkey_dsa_copy,
282    pkey_dsa_cleanup,
283
284    0,
285    pkey_dsa_paramgen,
286
287    0,
288    pkey_dsa_keygen,
289
290    0,
291    pkey_dsa_sign,
292
293    0,
294    pkey_dsa_verify,
295
296    0, 0,
297
298    0, 0, 0, 0,
299
300    0, 0,
301
302    0, 0,
303
304    0, 0,
305
306    pkey_dsa_ctrl,
307    pkey_dsa_ctrl_str
308};
309