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1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2  * project 2006.
3  */
4 /* ====================================================================
5  * Copyright (c) 2006,2007 The OpenSSL Project.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the
17  *    distribution.
18  *
19  * 3. All advertising materials mentioning features or use of this
20  *    software must display the following acknowledgment:
21  *    "This product includes software developed by the OpenSSL Project
22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23  *
24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25  *    endorse or promote products derived from this software without
26  *    prior written permission. For written permission, please contact
27  *    licensing@OpenSSL.org.
28  *
29  * 5. Products derived from this software may not be called "OpenSSL"
30  *    nor may "OpenSSL" appear in their names without prior written
31  *    permission of the OpenSSL Project.
32  *
33  * 6. Redistributions of any form whatsoever must retain the following
34  *    acknowledgment:
35  *    "This product includes software developed by the OpenSSL Project
36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37  *
38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49  * OF THE POSSIBILITY OF SUCH DAMAGE.
50  * ====================================================================
51  *
52  * This product includes cryptographic software written by Eric Young
53  * (eay@cryptsoft.com).  This product includes software written by Tim
54  * Hudson (tjh@cryptsoft.com). */
55 
56 #include <openssl/evp.h>
57 
58 #include <openssl/err.h>
59 
60 #include "internal.h"
61 #include "../fipsmodule/digest/internal.h"
62 
63 
64 enum evp_sign_verify_t {
65   evp_sign,
66   evp_verify,
67 };
68 
69 static const struct evp_md_pctx_ops md_pctx_ops = {
70   EVP_PKEY_CTX_free,
71   EVP_PKEY_CTX_dup,
72 };
73 
uses_prehash(EVP_MD_CTX * ctx,enum evp_sign_verify_t op)74 static int uses_prehash(EVP_MD_CTX *ctx, enum evp_sign_verify_t op) {
75   return (op == evp_sign) ? (ctx->pctx->pmeth->sign != NULL)
76                           : (ctx->pctx->pmeth->verify != NULL);
77 }
78 
do_sigver_init(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey,enum evp_sign_verify_t op)79 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
80                           const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
81                           enum evp_sign_verify_t op) {
82   if (ctx->pctx == NULL) {
83     ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
84   }
85   if (ctx->pctx == NULL) {
86     return 0;
87   }
88   ctx->pctx_ops = &md_pctx_ops;
89 
90   if (op == evp_verify) {
91     if (!EVP_PKEY_verify_init(ctx->pctx)) {
92       return 0;
93     }
94   } else {
95     if (!EVP_PKEY_sign_init(ctx->pctx)) {
96       return 0;
97     }
98   }
99 
100   if (type != NULL &&
101       !EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) {
102     return 0;
103   }
104 
105   if (uses_prehash(ctx, op)) {
106     if (type == NULL) {
107       OPENSSL_PUT_ERROR(EVP, EVP_R_NO_DEFAULT_DIGEST);
108       return 0;
109     }
110     if (!EVP_DigestInit_ex(ctx, type, e)) {
111       return 0;
112     }
113   }
114 
115   if (pctx) {
116     *pctx = ctx->pctx;
117   }
118   return 1;
119 }
120 
EVP_DigestSignInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)121 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
122                        ENGINE *e, EVP_PKEY *pkey) {
123   return do_sigver_init(ctx, pctx, type, e, pkey, evp_sign);
124 }
125 
EVP_DigestVerifyInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)126 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
127                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) {
128   return do_sigver_init(ctx, pctx, type, e, pkey, evp_verify);
129 }
130 
EVP_DigestSignUpdate(EVP_MD_CTX * ctx,const void * data,size_t len)131 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
132   if (!uses_prehash(ctx, evp_sign)) {
133     OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
134     return 0;
135   }
136 
137   return EVP_DigestUpdate(ctx, data, len);
138 }
139 
EVP_DigestVerifyUpdate(EVP_MD_CTX * ctx,const void * data,size_t len)140 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
141   if (!uses_prehash(ctx, evp_verify)) {
142     OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
143     return 0;
144   }
145 
146   return EVP_DigestUpdate(ctx, data, len);
147 }
148 
EVP_DigestSignFinal(EVP_MD_CTX * ctx,uint8_t * out_sig,size_t * out_sig_len)149 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
150                         size_t *out_sig_len) {
151   if (!uses_prehash(ctx, evp_sign)) {
152     OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
153     return 0;
154   }
155 
156   if (out_sig) {
157     EVP_MD_CTX tmp_ctx;
158     int ret;
159     uint8_t md[EVP_MAX_MD_SIZE];
160     unsigned int mdlen;
161 
162     EVP_MD_CTX_init(&tmp_ctx);
163     ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
164           EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
165           EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen);
166     EVP_MD_CTX_cleanup(&tmp_ctx);
167 
168     return ret;
169   } else {
170     size_t s = EVP_MD_size(ctx->digest);
171     return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s);
172   }
173 }
174 
EVP_DigestVerifyFinal(EVP_MD_CTX * ctx,const uint8_t * sig,size_t sig_len)175 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
176                           size_t sig_len) {
177   if (!uses_prehash(ctx, evp_verify)) {
178     OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
179     return 0;
180   }
181 
182   EVP_MD_CTX tmp_ctx;
183   int ret;
184   uint8_t md[EVP_MAX_MD_SIZE];
185   unsigned int mdlen;
186 
187   EVP_MD_CTX_init(&tmp_ctx);
188   ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
189         EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
190         EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
191   EVP_MD_CTX_cleanup(&tmp_ctx);
192 
193   return ret;
194 }
195 
EVP_DigestSign(EVP_MD_CTX * ctx,uint8_t * out_sig,size_t * out_sig_len,const uint8_t * data,size_t data_len)196 int EVP_DigestSign(EVP_MD_CTX *ctx, uint8_t *out_sig, size_t *out_sig_len,
197                    const uint8_t *data, size_t data_len) {
198   if (uses_prehash(ctx, evp_sign)) {
199     // If |out_sig| is NULL, the caller is only querying the maximum output
200     // length. |data| should only be incorporated in the final call.
201     if (out_sig != NULL &&
202         !EVP_DigestSignUpdate(ctx, data, data_len)) {
203       return 0;
204     }
205 
206     return EVP_DigestSignFinal(ctx, out_sig, out_sig_len);
207   }
208 
209   if (ctx->pctx->pmeth->sign_message == NULL) {
210     OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
211     return 0;
212   }
213 
214   return ctx->pctx->pmeth->sign_message(ctx->pctx, out_sig, out_sig_len, data,
215                                         data_len);
216 }
217 
EVP_DigestVerify(EVP_MD_CTX * ctx,const uint8_t * sig,size_t sig_len,const uint8_t * data,size_t len)218 int EVP_DigestVerify(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len,
219                      const uint8_t *data, size_t len) {
220   if (uses_prehash(ctx, evp_verify)) {
221     return EVP_DigestVerifyUpdate(ctx, data, len) &&
222            EVP_DigestVerifyFinal(ctx, sig, sig_len);
223   }
224 
225   if (ctx->pctx->pmeth->verify_message == NULL) {
226     OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
227     return 0;
228   }
229 
230   return ctx->pctx->pmeth->verify_message(ctx->pctx, sig, sig_len, data, len);
231 }
232