1/*
2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <stdlib.h>
12#include "internal/cryptlib.h"
13#include <openssl/objects.h>
14#include <openssl/evp.h>
15#include "crypto/bn.h"
16#include "crypto/asn1.h"
17#include "crypto/evp.h"
18
19int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
20{
21    int ret;
22    if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {
23        EVPerr(EVP_F_EVP_PKEY_PARAMGEN_INIT,
24               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
25        return -2;
26    }
27    ctx->operation = EVP_PKEY_OP_PARAMGEN;
28    if (!ctx->pmeth->paramgen_init)
29        return 1;
30    ret = ctx->pmeth->paramgen_init(ctx);
31    if (ret <= 0)
32        ctx->operation = EVP_PKEY_OP_UNDEFINED;
33    return ret;
34}
35
36int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
37{
38    int ret;
39    if (!ctx || !ctx->pmeth || !ctx->pmeth->paramgen) {
40        EVPerr(EVP_F_EVP_PKEY_PARAMGEN,
41               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
42        return -2;
43    }
44
45    if (ctx->operation != EVP_PKEY_OP_PARAMGEN) {
46        EVPerr(EVP_F_EVP_PKEY_PARAMGEN, EVP_R_OPERATON_NOT_INITIALIZED);
47        return -1;
48    }
49
50    if (ppkey == NULL)
51        return -1;
52
53    if (*ppkey == NULL)
54        *ppkey = EVP_PKEY_new();
55
56    if (*ppkey == NULL) {
57        EVPerr(EVP_F_EVP_PKEY_PARAMGEN, ERR_R_MALLOC_FAILURE);
58        return -1;
59    }
60
61    ret = ctx->pmeth->paramgen(ctx, *ppkey);
62    if (ret <= 0) {
63        EVP_PKEY_free(*ppkey);
64        *ppkey = NULL;
65    }
66    return ret;
67}
68
69int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
70{
71    int ret;
72    if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {
73        EVPerr(EVP_F_EVP_PKEY_KEYGEN_INIT,
74               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
75        return -2;
76    }
77    ctx->operation = EVP_PKEY_OP_KEYGEN;
78    if (!ctx->pmeth->keygen_init)
79        return 1;
80    ret = ctx->pmeth->keygen_init(ctx);
81    if (ret <= 0)
82        ctx->operation = EVP_PKEY_OP_UNDEFINED;
83    return ret;
84}
85
86int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
87{
88    int ret;
89
90    if (!ctx || !ctx->pmeth || !ctx->pmeth->keygen) {
91        EVPerr(EVP_F_EVP_PKEY_KEYGEN,
92               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
93        return -2;
94    }
95    if (ctx->operation != EVP_PKEY_OP_KEYGEN) {
96        EVPerr(EVP_F_EVP_PKEY_KEYGEN, EVP_R_OPERATON_NOT_INITIALIZED);
97        return -1;
98    }
99
100    if (ppkey == NULL)
101        return -1;
102
103    if (*ppkey == NULL)
104        *ppkey = EVP_PKEY_new();
105    if (*ppkey == NULL)
106        return -1;
107
108    ret = ctx->pmeth->keygen(ctx, *ppkey);
109    if (ret <= 0) {
110        EVP_PKEY_free(*ppkey);
111        *ppkey = NULL;
112    }
113    return ret;
114}
115
116void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)
117{
118    ctx->pkey_gencb = cb;
119}
120
121EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)
122{
123    return ctx->pkey_gencb;
124}
125
126/*
127 * "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB style
128 * callbacks.
129 */
130
131static int trans_cb(int a, int b, BN_GENCB *gcb)
132{
133    EVP_PKEY_CTX *ctx = BN_GENCB_get_arg(gcb);
134    ctx->keygen_info[0] = a;
135    ctx->keygen_info[1] = b;
136    return ctx->pkey_gencb(ctx);
137}
138
139void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)
140{
141    BN_GENCB_set(cb, trans_cb, ctx);
142}
143
144int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)
145{
146    if (idx == -1)
147        return ctx->keygen_info_count;
148    if (idx < 0 || idx > ctx->keygen_info_count)
149        return 0;
150    return ctx->keygen_info[idx];
151}
152
153EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e,
154                               const unsigned char *key, int keylen)
155{
156    EVP_PKEY_CTX *mac_ctx = NULL;
157    EVP_PKEY *mac_key = NULL;
158    mac_ctx = EVP_PKEY_CTX_new_id(type, e);
159    if (!mac_ctx)
160        return NULL;
161    if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
162        goto merr;
163    if (EVP_PKEY_CTX_set_mac_key(mac_ctx, key, keylen) <= 0)
164        goto merr;
165    if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
166        goto merr;
167 merr:
168    EVP_PKEY_CTX_free(mac_ctx);
169    return mac_key;
170}
171
172int EVP_PKEY_check(EVP_PKEY_CTX *ctx)
173{
174    EVP_PKEY *pkey = ctx->pkey;
175
176    if (pkey == NULL) {
177        EVPerr(EVP_F_EVP_PKEY_CHECK, EVP_R_NO_KEY_SET);
178        return 0;
179    }
180
181    /* call customized check function first */
182    if (ctx->pmeth->check != NULL)
183        return ctx->pmeth->check(pkey);
184
185    /* use default check function in ameth */
186    if (pkey->ameth == NULL || pkey->ameth->pkey_check == NULL) {
187        EVPerr(EVP_F_EVP_PKEY_CHECK,
188               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
189        return -2;
190    }
191
192    return pkey->ameth->pkey_check(pkey);
193}
194
195int EVP_PKEY_public_check(EVP_PKEY_CTX *ctx)
196{
197    EVP_PKEY *pkey = ctx->pkey;
198
199    if (pkey == NULL) {
200        EVPerr(EVP_F_EVP_PKEY_PUBLIC_CHECK, EVP_R_NO_KEY_SET);
201        return 0;
202    }
203
204    /* call customized public key check function first */
205    if (ctx->pmeth->public_check != NULL)
206        return ctx->pmeth->public_check(pkey);
207
208    /* use default public key check function in ameth */
209    if (pkey->ameth == NULL || pkey->ameth->pkey_public_check == NULL) {
210        EVPerr(EVP_F_EVP_PKEY_PUBLIC_CHECK,
211               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
212        return -2;
213    }
214
215    return pkey->ameth->pkey_public_check(pkey);
216}
217
218int EVP_PKEY_param_check(EVP_PKEY_CTX *ctx)
219{
220    EVP_PKEY *pkey = ctx->pkey;
221
222    if (pkey == NULL) {
223        EVPerr(EVP_F_EVP_PKEY_PARAM_CHECK, EVP_R_NO_KEY_SET);
224        return 0;
225    }
226
227    /* call customized param check function first */
228    if (ctx->pmeth->param_check != NULL)
229        return ctx->pmeth->param_check(pkey);
230
231    /* use default param check function in ameth */
232    if (pkey->ameth == NULL || pkey->ameth->pkey_param_check == NULL) {
233        EVPerr(EVP_F_EVP_PKEY_PARAM_CHECK,
234               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
235        return -2;
236    }
237
238    return pkey->ameth->pkey_param_check(pkey);
239}
240