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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |