1 /* pmeth_gn.c */
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 #include "cryptlib.h"
62 #include <openssl/objects.h>
63 #include <openssl/evp.h>
64 #include <openssl/bn.h>
65 #include "evp_locl.h"
66 
67 int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
68 	{
69 	int ret;
70 	if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen)
71 		{
72 		EVPerr(EVP_F_EVP_PKEY_PARAMGEN_INIT,
73 			EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
74 		return -2;
75 		}
76 	ctx->operation = EVP_PKEY_OP_PARAMGEN;
77 	if (!ctx->pmeth->paramgen_init)
78 		return 1;
79 	ret = ctx->pmeth->paramgen_init(ctx);
80 	if (ret <= 0)
81 		ctx->operation = EVP_PKEY_OP_UNDEFINED;
82 	return ret;
83 	}
84 
85 int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
86 	{
87 	int ret;
88 	if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen)
89 		{
90 		EVPerr(EVP_F_EVP_PKEY_PARAMGEN,
91 			EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
92 		return -2;
93 		}
94 
95 	if (ctx->operation != EVP_PKEY_OP_PARAMGEN)
96 		{
97 		EVPerr(EVP_F_EVP_PKEY_PARAMGEN, EVP_R_OPERATON_NOT_INITIALIZED);
98 		return -1;
99 		}
100 
101 	if (!ppkey)
102 		return -1;
103 
104 	if (!*ppkey)
105 		*ppkey = EVP_PKEY_new();
106 
107 	ret = ctx->pmeth->paramgen(ctx, *ppkey);
108 	if (ret <= 0)
109 		{
110 		EVP_PKEY_free(*ppkey);
111 		*ppkey = NULL;
112 		}
113 	return ret;
114 	}
115 
116 int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
117 	{
118 	int ret;
119 	if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen)
120 		{
121 		EVPerr(EVP_F_EVP_PKEY_KEYGEN_INIT,
122 			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 
134 int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
135 	{
136 	int ret;
137 
138 	if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen)
139 		{
140 		EVPerr(EVP_F_EVP_PKEY_KEYGEN,
141 			EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
142 		return -2;
143 		}
144 	if (ctx->operation != EVP_PKEY_OP_KEYGEN)
145 		{
146 		EVPerr(EVP_F_EVP_PKEY_KEYGEN, EVP_R_OPERATON_NOT_INITIALIZED);
147 		return -1;
148 		}
149 
150 	if (!ppkey)
151 		return -1;
152 
153 	if (!*ppkey)
154 		*ppkey = EVP_PKEY_new();
155 
156 	ret = ctx->pmeth->keygen(ctx, *ppkey);
157 	if (ret <= 0)
158 		{
159 		EVP_PKEY_free(*ppkey);
160 		*ppkey = NULL;
161 		}
162 	return ret;
163 	}
164 
165 void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)
166 	{
167 	ctx->pkey_gencb = cb;
168 	}
169 
170 EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)
171 	{
172 	return ctx->pkey_gencb;
173 	}
174 
175 /* "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB
176  * style callbacks.
177  */
178 
179 static int trans_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 
187 void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)
188 	{
189 	BN_GENCB_set(cb, trans_cb, ctx)
190 	}
191 
192 int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)
193 	{
194 	if (idx == -1)
195 		return ctx->keygen_info_count;
196 	if (idx < 0 || idx > ctx->keygen_info_count)
197 		return 0;
198 	return ctx->keygen_info[idx];
199 	}
200 
201 EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e,
202 				const unsigned char *key, int keylen)
203 	{
204 	EVP_PKEY_CTX *mac_ctx = NULL;
205 	EVP_PKEY *mac_key = NULL;
206 	mac_ctx = EVP_PKEY_CTX_new_id(type, e);
207 	if (!mac_ctx)
208 		return NULL;
209 	if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
210 		goto merr;
211 	if (EVP_PKEY_CTX_ctrl(mac_ctx, -1, EVP_PKEY_OP_KEYGEN,
212 				EVP_PKEY_CTRL_SET_MAC_KEY,
213 				keylen, (void *)key) <= 0)
214 		goto merr;
215 	if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
216 		goto merr;
217 	merr:
218 	if (mac_ctx)
219 		EVP_PKEY_CTX_free(mac_ctx);
220 	return mac_key;
221 	}
222