pmeth_fn.c revision 296341 
1/* pmeth_fn.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 2006.
5 */
6/* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
61#include <stdlib.h>
62#include "cryptlib.h"
63#include <openssl/objects.h>
64#include <openssl/evp.h>
65#include "evp_locl.h"
66
67#define M_check_autoarg(ctx, arg, arglen, err) \
68        if (ctx->pmeth->flags & EVP_PKEY_FLAG_AUTOARGLEN) \
69                { \
70                size_t pksize = (size_t)EVP_PKEY_size(ctx->pkey); \
71                if (!arg) \
72                        { \
73                        *arglen = pksize; \
74                        return 1; \
75                        } \
76                else if (*arglen < pksize) \
77                        { \
78                        EVPerr(err, EVP_R_BUFFER_TOO_SMALL); /*ckerr_ignore*/\
79                        return 0; \
80                        } \
81                }
82
83int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
84{
85    int ret;
86    if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {
87        EVPerr(EVP_F_EVP_PKEY_SIGN_INIT,
88               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
89        return -2;
90    }
91    ctx->operation = EVP_PKEY_OP_SIGN;
92    if (!ctx->pmeth->sign_init)
93        return 1;
94    ret = ctx->pmeth->sign_init(ctx);
95    if (ret <= 0)
96        ctx->operation = EVP_PKEY_OP_UNDEFINED;
97    return ret;
98}
99
100int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
101                  unsigned char *sig, size_t *siglen,
102                  const unsigned char *tbs, size_t tbslen)
103{
104    if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {
105        EVPerr(EVP_F_EVP_PKEY_SIGN,
106               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
107        return -2;
108    }
109    if (ctx->operation != EVP_PKEY_OP_SIGN) {
110        EVPerr(EVP_F_EVP_PKEY_SIGN, EVP_R_OPERATON_NOT_INITIALIZED);
111        return -1;
112    }
113    M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
114        return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
115}
116
117int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
118{
119    int ret;
120    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {
121        EVPerr(EVP_F_EVP_PKEY_VERIFY_INIT,
122               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
123        return -2;
124    }
125    ctx->operation = EVP_PKEY_OP_VERIFY;
126    if (!ctx->pmeth->verify_init)
127        return 1;
128    ret = ctx->pmeth->verify_init(ctx);
129    if (ret <= 0)
130        ctx->operation = EVP_PKEY_OP_UNDEFINED;
131    return ret;
132}
133
134int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
135                    const unsigned char *sig, size_t siglen,
136                    const unsigned char *tbs, size_t tbslen)
137{
138    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {
139        EVPerr(EVP_F_EVP_PKEY_VERIFY,
140               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
141        return -2;
142    }
143    if (ctx->operation != EVP_PKEY_OP_VERIFY) {
144        EVPerr(EVP_F_EVP_PKEY_VERIFY, EVP_R_OPERATON_NOT_INITIALIZED);
145        return -1;
146    }
147    return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
148}
149
150int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
151{
152    int ret;
153    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {
154        EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER_INIT,
155               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
156        return -2;
157    }
158    ctx->operation = EVP_PKEY_OP_VERIFYRECOVER;
159    if (!ctx->pmeth->verify_recover_init)
160        return 1;
161    ret = ctx->pmeth->verify_recover_init(ctx);
162    if (ret <= 0)
163        ctx->operation = EVP_PKEY_OP_UNDEFINED;
164    return ret;
165}
166
167int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,
168                            unsigned char *rout, size_t *routlen,
169                            const unsigned char *sig, size_t siglen)
170{
171    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {
172        EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER,
173               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
174        return -2;
175    }
176    if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
177        EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER, EVP_R_OPERATON_NOT_INITIALIZED);
178        return -1;
179    }
180    M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
181        return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
182}
183
184int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
185{
186    int ret;
187    if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
188        EVPerr(EVP_F_EVP_PKEY_ENCRYPT_INIT,
189               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
190        return -2;
191    }
192    ctx->operation = EVP_PKEY_OP_ENCRYPT;
193    if (!ctx->pmeth->encrypt_init)
194        return 1;
195    ret = ctx->pmeth->encrypt_init(ctx);
196    if (ret <= 0)
197        ctx->operation = EVP_PKEY_OP_UNDEFINED;
198    return ret;
199}
200
201int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
202                     unsigned char *out, size_t *outlen,
203                     const unsigned char *in, size_t inlen)
204{
205    if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
206        EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
207               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
208        return -2;
209    }
210    if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
211        EVPerr(EVP_F_EVP_PKEY_ENCRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
212        return -1;
213    }
214    M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
215        return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
216}
217
218int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
219{
220    int ret;
221    if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
222        EVPerr(EVP_F_EVP_PKEY_DECRYPT_INIT,
223               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
224        return -2;
225    }
226    ctx->operation = EVP_PKEY_OP_DECRYPT;
227    if (!ctx->pmeth->decrypt_init)
228        return 1;
229    ret = ctx->pmeth->decrypt_init(ctx);
230    if (ret <= 0)
231        ctx->operation = EVP_PKEY_OP_UNDEFINED;
232    return ret;
233}
234
235int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
236                     unsigned char *out, size_t *outlen,
237                     const unsigned char *in, size_t inlen)
238{
239    if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
240        EVPerr(EVP_F_EVP_PKEY_DECRYPT,
241               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
242        return -2;
243    }
244    if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
245        EVPerr(EVP_F_EVP_PKEY_DECRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
246        return -1;
247    }
248    M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
249        return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
250}
251
252int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)
253{
254    int ret;
255    if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
256        EVPerr(EVP_F_EVP_PKEY_DERIVE_INIT,
257               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
258        return -2;
259    }
260    ctx->operation = EVP_PKEY_OP_DERIVE;
261    if (!ctx->pmeth->derive_init)
262        return 1;
263    ret = ctx->pmeth->derive_init(ctx);
264    if (ret <= 0)
265        ctx->operation = EVP_PKEY_OP_UNDEFINED;
266    return ret;
267}
268
269int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)
270{
271    int ret;
272    if (!ctx || !ctx->pmeth
273        || !(ctx->pmeth->derive || ctx->pmeth->encrypt || ctx->pmeth->decrypt)
274        || !ctx->pmeth->ctrl) {
275        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
276               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
277        return -2;
278    }
279    if (ctx->operation != EVP_PKEY_OP_DERIVE
280        && ctx->operation != EVP_PKEY_OP_ENCRYPT
281        && ctx->operation != EVP_PKEY_OP_DECRYPT) {
282        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
283               EVP_R_OPERATON_NOT_INITIALIZED);
284        return -1;
285    }
286
287    ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);
288
289    if (ret <= 0)
290        return ret;
291
292    if (ret == 2)
293        return 1;
294
295    if (!ctx->pkey) {
296        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_NO_KEY_SET);
297        return -1;
298    }
299
300    if (ctx->pkey->type != peer->type) {
301        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_KEY_TYPES);
302        return -1;
303    }
304
305    /*
306     * ran@cryptocom.ru: For clarity.  The error is if parameters in peer are
307     * present (!missing) but don't match.  EVP_PKEY_cmp_parameters may return
308     * 1 (match), 0 (don't match) and -2 (comparison is not defined).  -1
309     * (different key types) is impossible here because it is checked earlier.
310     * -2 is OK for us here, as well as 1, so we can check for 0 only.
311     */
312    if (!EVP_PKEY_missing_parameters(peer) &&
313        !EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {
314        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_PARAMETERS);
315        return -1;
316    }
317
318    if (ctx->peerkey)
319        EVP_PKEY_free(ctx->peerkey);
320    ctx->peerkey = peer;
321
322    ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);
323
324    if (ret <= 0) {
325        ctx->peerkey = NULL;
326        return ret;
327    }
328
329    CRYPTO_add(&peer->references, 1, CRYPTO_LOCK_EVP_PKEY);
330    return 1;
331}
332
333int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *pkeylen)
334{
335    if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
336        EVPerr(EVP_F_EVP_PKEY_DERIVE,
337               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
338        return -2;
339    }
340    if (ctx->operation != EVP_PKEY_OP_DERIVE) {
341        EVPerr(EVP_F_EVP_PKEY_DERIVE, EVP_R_OPERATON_NOT_INITIALIZED);
342        return -1;
343    }
344    M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)
345        return ctx->pmeth->derive(ctx, key, pkeylen);
346}
347