2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #include "internal/cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/evp.h>
64 #include <openssl/bn.h>
65 #include "internal/evp_int.h"
68 /* DSA pkey context structure */
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 */
78 const EVP_MD *md; /* MD for the signature */
81 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
84 dctx = OPENSSL_malloc(sizeof(*dctx));
93 ctx->keygen_info = dctx->gentmp;
94 ctx->keygen_info_count = 2;
99 static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
101 DSA_PKEY_CTX *dctx, *sctx;
102 if (!pkey_dsa_init(dst))
106 dctx->nbits = sctx->nbits;
107 dctx->qbits = sctx->qbits;
108 dctx->pmd = sctx->pmd;
113 static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
115 DSA_PKEY_CTX *dctx = ctx->data;
119 static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
120 size_t *siglen, const unsigned char *tbs,
125 DSA_PKEY_CTX *dctx = ctx->data;
126 DSA *dsa = ctx->pkey->pkey.dsa;
129 if (tbslen != (size_t)EVP_MD_size(dctx->md))
131 type = EVP_MD_type(dctx->md);
133 if (tbslen != SHA_DIGEST_LENGTH)
138 ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
146 static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
147 const unsigned char *sig, size_t siglen,
148 const unsigned char *tbs, size_t tbslen)
151 DSA_PKEY_CTX *dctx = ctx->data;
152 DSA *dsa = ctx->pkey->pkey.dsa;
155 if (tbslen != (size_t)EVP_MD_size(dctx->md))
157 type = EVP_MD_type(dctx->md);
159 if (tbslen != SHA_DIGEST_LENGTH)
164 ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
169 static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
171 DSA_PKEY_CTX *dctx = ctx->data;
173 case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
179 case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
180 if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
185 case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
186 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
187 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
188 EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
189 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
195 case EVP_PKEY_CTRL_MD:
196 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
197 EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
198 EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
199 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
200 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
201 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
202 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
203 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
209 case EVP_PKEY_CTRL_GET_MD:
210 *(const EVP_MD **)p2 = dctx->md;
213 case EVP_PKEY_CTRL_DIGESTINIT:
214 case EVP_PKEY_CTRL_PKCS7_SIGN:
215 case EVP_PKEY_CTRL_CMS_SIGN:
218 case EVP_PKEY_CTRL_PEER_KEY:
219 DSAerr(DSA_F_PKEY_DSA_CTRL,
220 EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
228 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
229 const char *type, const char *value)
231 if (strcmp(type, "dsa_paramgen_bits") == 0) {
234 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
236 if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
237 int qbits = atoi(value);
238 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
239 EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
242 if (strcmp(type, "dsa_paramgen_md") == 0) {
243 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
244 EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
245 (void *)EVP_get_digestbyname(value));
250 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
253 DSA_PKEY_CTX *dctx = ctx->data;
256 if (ctx->pkey_gencb) {
257 pcb = BN_GENCB_new();
260 evp_pkey_set_cb_translate(pcb, ctx);
268 ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
269 NULL, 0, NULL, NULL, NULL, pcb);
272 EVP_PKEY_assign_DSA(pkey, dsa);
278 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
281 if (ctx->pkey == NULL) {
282 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
288 EVP_PKEY_assign_DSA(pkey, dsa);
289 /* Note: if error return, pkey is freed by parent routine */
290 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
292 return DSA_generate_key(pkey->pkey.dsa);
295 const EVP_PKEY_METHOD dsa_pkey_meth = {
297 EVP_PKEY_FLAG_AUTOARGLEN,