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5c4436c9 | 1 | /* crypto/cms/cms_enc.c */ |
0f113f3e MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
5c4436c9 DSH |
4 | * project. |
5 | */ | |
6 | /* ==================================================================== | |
7 | * Copyright (c) 2008 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
5c4436c9 DSH |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * licensing@OpenSSL.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | */ | |
54 | ||
b39fc560 | 55 | #include "internal/cryptlib.h" |
5c4436c9 DSH |
56 | #include <openssl/asn1t.h> |
57 | #include <openssl/pem.h> | |
58 | #include <openssl/x509v3.h> | |
59 | #include <openssl/err.h> | |
60 | #include <openssl/cms.h> | |
61 | #include <openssl/rand.h> | |
62 | #include "cms_lcl.h" | |
5c4436c9 DSH |
63 | |
64 | /* CMS EncryptedData Utilities */ | |
65 | ||
320bfc1b DSH |
66 | /* Return BIO based on EncryptedContentInfo and key */ |
67 | ||
68 | BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec) | |
0f113f3e MC |
69 | { |
70 | BIO *b; | |
71 | EVP_CIPHER_CTX *ctx; | |
72 | const EVP_CIPHER *ciph; | |
73 | X509_ALGOR *calg = ec->contentEncryptionAlgorithm; | |
74 | unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL; | |
75 | unsigned char *tkey = NULL; | |
76 | size_t tkeylen = 0; | |
5c4436c9 | 77 | |
0f113f3e | 78 | int ok = 0; |
d9f5f07e | 79 | |
0f113f3e | 80 | int enc, keep_key = 0; |
5c4436c9 | 81 | |
0f113f3e | 82 | enc = ec->cipher ? 1 : 0; |
5c4436c9 | 83 | |
0f113f3e MC |
84 | b = BIO_new(BIO_f_cipher()); |
85 | if (!b) { | |
86 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); | |
87 | return NULL; | |
88 | } | |
5c4436c9 | 89 | |
0f113f3e | 90 | BIO_get_cipher_ctx(b, &ctx); |
5c4436c9 | 91 | |
0f113f3e MC |
92 | if (enc) { |
93 | ciph = ec->cipher; | |
94 | /* | |
95 | * If not keeping key set cipher to NULL so subsequent calls decrypt. | |
96 | */ | |
97 | if (ec->key) | |
98 | ec->cipher = NULL; | |
99 | } else { | |
100 | ciph = EVP_get_cipherbyobj(calg->algorithm); | |
5c4436c9 | 101 | |
0f113f3e MC |
102 | if (!ciph) { |
103 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER); | |
104 | goto err; | |
105 | } | |
106 | } | |
5c4436c9 | 107 | |
0f113f3e MC |
108 | if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) { |
109 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
110 | CMS_R_CIPHER_INITIALISATION_ERROR); | |
111 | goto err; | |
112 | } | |
5c4436c9 | 113 | |
0f113f3e MC |
114 | if (enc) { |
115 | int ivlen; | |
116 | calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); | |
117 | /* Generate a random IV if we need one */ | |
118 | ivlen = EVP_CIPHER_CTX_iv_length(ctx); | |
119 | if (ivlen > 0) { | |
266483d2 | 120 | if (RAND_bytes(iv, ivlen) <= 0) |
0f113f3e MC |
121 | goto err; |
122 | piv = iv; | |
123 | } | |
124 | } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) { | |
125 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
126 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
127 | goto err; | |
128 | } | |
129 | tkeylen = EVP_CIPHER_CTX_key_length(ctx); | |
130 | /* Generate random session key */ | |
131 | if (!enc || !ec->key) { | |
132 | tkey = OPENSSL_malloc(tkeylen); | |
133 | if (!tkey) { | |
134 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); | |
135 | goto err; | |
136 | } | |
137 | if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0) | |
138 | goto err; | |
139 | } | |
146b52ed | 140 | |
0f113f3e MC |
141 | if (!ec->key) { |
142 | ec->key = tkey; | |
143 | ec->keylen = tkeylen; | |
144 | tkey = NULL; | |
145 | if (enc) | |
146 | keep_key = 1; | |
147 | else | |
148 | ERR_clear_error(); | |
146b52ed | 149 | |
0f113f3e | 150 | } |
e540d1cd | 151 | |
0f113f3e MC |
152 | if (ec->keylen != tkeylen) { |
153 | /* If necessary set key length */ | |
154 | if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) { | |
155 | /* | |
156 | * Only reveal failure if debugging so we don't leak information | |
157 | * which may be useful in MMA. | |
158 | */ | |
159 | if (enc || ec->debug) { | |
160 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
161 | CMS_R_INVALID_KEY_LENGTH); | |
162 | goto err; | |
163 | } else { | |
164 | /* Use random key */ | |
4b45c6e5 | 165 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
166 | ec->key = tkey; |
167 | ec->keylen = tkeylen; | |
168 | tkey = NULL; | |
169 | ERR_clear_error(); | |
170 | } | |
171 | } | |
172 | } | |
5c4436c9 | 173 | |
0f113f3e MC |
174 | if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) { |
175 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
176 | CMS_R_CIPHER_INITIALISATION_ERROR); | |
177 | goto err; | |
178 | } | |
5c4436c9 | 179 | |
0f113f3e MC |
180 | if (piv) { |
181 | calg->parameter = ASN1_TYPE_new(); | |
182 | if (!calg->parameter) { | |
183 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); | |
184 | goto err; | |
185 | } | |
186 | if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) { | |
187 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
188 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
189 | goto err; | |
190 | } | |
191 | } | |
192 | ok = 1; | |
5c4436c9 | 193 | |
0f113f3e | 194 | err: |
891eac46 | 195 | if (!keep_key || !ok) { |
4b45c6e5 | 196 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
197 | ec->key = NULL; |
198 | } | |
4b45c6e5 | 199 | OPENSSL_clear_free(tkey, tkeylen); |
0f113f3e MC |
200 | if (ok) |
201 | return b; | |
202 | BIO_free(b); | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, | |
207 | const EVP_CIPHER *cipher, | |
208 | const unsigned char *key, size_t keylen) | |
209 | { | |
210 | ec->cipher = cipher; | |
211 | if (key) { | |
212 | ec->key = OPENSSL_malloc(keylen); | |
213 | if (!ec->key) | |
214 | return 0; | |
215 | memcpy(ec->key, key, keylen); | |
216 | } | |
217 | ec->keylen = keylen; | |
218 | if (cipher) | |
219 | ec->contentType = OBJ_nid2obj(NID_pkcs7_data); | |
220 | return 1; | |
221 | } | |
320bfc1b DSH |
222 | |
223 | int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph, | |
0f113f3e MC |
224 | const unsigned char *key, size_t keylen) |
225 | { | |
226 | CMS_EncryptedContentInfo *ec; | |
227 | if (!key || !keylen) { | |
228 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY); | |
229 | return 0; | |
230 | } | |
231 | if (ciph) { | |
232 | cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData); | |
233 | if (!cms->d.encryptedData) { | |
234 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE); | |
235 | return 0; | |
236 | } | |
237 | cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted); | |
238 | cms->d.encryptedData->version = 0; | |
239 | } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) { | |
240 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA); | |
241 | return 0; | |
242 | } | |
243 | ec = cms->d.encryptedData->encryptedContentInfo; | |
244 | return cms_EncryptedContent_init(ec, ciph, key, keylen); | |
245 | } | |
320bfc1b DSH |
246 | |
247 | BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms) | |
0f113f3e MC |
248 | { |
249 | CMS_EncryptedData *enc = cms->d.encryptedData; | |
250 | if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs) | |
251 | enc->version = 2; | |
252 | return cms_EncryptedContent_init_bio(enc->encryptedContentInfo); | |
253 | } |