pmeth_gn.c revision 1.6 
1/* $OpenBSD: pmeth_gn.c,v 1.6 2017/01/29 17:49:23 beck Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 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 <stdlib.h>
61
62#include <openssl/bn.h>
63#include <openssl/err.h>
64#include <openssl/evp.h>
65#include <openssl/objects.h>
66
67#include "evp_locl.h"
68
69int
70EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
71{
72	int ret;
73
74	if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {
75		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
76		return -2;
77	}
78	ctx->operation = EVP_PKEY_OP_PARAMGEN;
79	if (!ctx->pmeth->paramgen_init)
80		return 1;
81	ret = ctx->pmeth->paramgen_init(ctx);
82	if (ret <= 0)
83		ctx->operation = EVP_PKEY_OP_UNDEFINED;
84	return ret;
85}
86
87int
88EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
89{
90	int ret;
91
92	if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {
93		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
94		return -2;
95	}
96
97	if (ctx->operation != EVP_PKEY_OP_PARAMGEN) {
98		EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
99		return -1;
100	}
101
102	if (!ppkey)
103		return -1;
104
105	if (!*ppkey)
106		*ppkey = EVP_PKEY_new();
107
108	ret = ctx->pmeth->paramgen(ctx, *ppkey);
109	if (ret <= 0) {
110		EVP_PKEY_free(*ppkey);
111		*ppkey = NULL;
112	}
113	return ret;
114}
115
116int
117EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
118{
119	int ret;
120
121	if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {
122		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
123		return -2;
124	}
125	ctx->operation = EVP_PKEY_OP_KEYGEN;
126	if (!ctx->pmeth->keygen_init)
127		return 1;
128	ret = ctx->pmeth->keygen_init(ctx);
129	if (ret <= 0)
130		ctx->operation = EVP_PKEY_OP_UNDEFINED;
131	return ret;
132}
133
134int
135EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
136{
137	int ret;
138
139	if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {
140		EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
141		return -2;
142	}
143	if (ctx->operation != EVP_PKEY_OP_KEYGEN) {
144		EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
145		return -1;
146	}
147
148	if (!ppkey)
149		return -1;
150
151	if (!*ppkey)
152		*ppkey = EVP_PKEY_new();
153
154	ret = ctx->pmeth->keygen(ctx, *ppkey);
155	if (ret <= 0) {
156		EVP_PKEY_free(*ppkey);
157		*ppkey = NULL;
158	}
159	return ret;
160}
161
162void
163EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)
164{
165	ctx->pkey_gencb = cb;
166}
167
168EVP_PKEY_gen_cb *
169EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)
170{
171	return ctx->pkey_gencb;
172}
173
174/* "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB
175 * style callbacks.
176 */
177
178static int
179trans_cb(int a, int b, BN_GENCB *gcb)
180{
181	EVP_PKEY_CTX *ctx = gcb->arg;
182	ctx->keygen_info[0] = a;
183	ctx->keygen_info[1] = b;
184	return ctx->pkey_gencb(ctx);
185}
186
187void
188evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)
189{
190	BN_GENCB_set(cb, trans_cb, ctx)
191}
192
193int
194EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)
195{
196	if (idx == -1)
197		return ctx->keygen_info_count;
198	if (idx < 0 || idx > ctx->keygen_info_count)
199		return 0;
200	return ctx->keygen_info[idx];
201}
202
203EVP_PKEY *
204EVP_PKEY_new_mac_key(int type, ENGINE *e, const unsigned char *key, int keylen)
205{
206	EVP_PKEY_CTX *mac_ctx = NULL;
207	EVP_PKEY *mac_key = NULL;
208
209	mac_ctx = EVP_PKEY_CTX_new_id(type, e);
210	if (!mac_ctx)
211		return NULL;
212	if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
213		goto merr;
214	if (EVP_PKEY_CTX_ctrl(mac_ctx, -1, EVP_PKEY_OP_KEYGEN,
215	    EVP_PKEY_CTRL_SET_MAC_KEY, keylen, (void *)key) <= 0)
216		goto merr;
217	if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
218		goto merr;
219
220merr:
221	EVP_PKEY_CTX_free(mac_ctx);
222	return mac_key;
223}
224