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Commit | Line | Data |
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0f113f3e | 1 | /* |
28428130 | 2 | * Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved. |
5c4436c9 | 3 | * |
08ddd302 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
b1322259 RS |
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 | |
5c4436c9 DSH |
8 | */ |
9 | ||
b39fc560 | 10 | #include "internal/cryptlib.h" |
5c4436c9 DSH |
11 | #include <openssl/asn1t.h> |
12 | #include <openssl/pem.h> | |
13 | #include <openssl/x509v3.h> | |
14 | #include <openssl/err.h> | |
15 | #include <openssl/cms.h> | |
16 | #include <openssl/rand.h> | |
17 | #include "cms_lcl.h" | |
5c4436c9 DSH |
18 | |
19 | /* CMS EncryptedData Utilities */ | |
20 | ||
320bfc1b DSH |
21 | /* Return BIO based on EncryptedContentInfo and key */ |
22 | ||
23 | BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec) | |
0f113f3e MC |
24 | { |
25 | BIO *b; | |
26 | EVP_CIPHER_CTX *ctx; | |
27 | const EVP_CIPHER *ciph; | |
28 | X509_ALGOR *calg = ec->contentEncryptionAlgorithm; | |
29 | unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL; | |
30 | unsigned char *tkey = NULL; | |
31 | size_t tkeylen = 0; | |
5c4436c9 | 32 | |
0f113f3e | 33 | int ok = 0; |
d9f5f07e | 34 | |
0f113f3e | 35 | int enc, keep_key = 0; |
5c4436c9 | 36 | |
0f113f3e | 37 | enc = ec->cipher ? 1 : 0; |
5c4436c9 | 38 | |
0f113f3e | 39 | b = BIO_new(BIO_f_cipher()); |
90945fa3 | 40 | if (b == NULL) { |
0f113f3e MC |
41 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
42 | return NULL; | |
43 | } | |
5c4436c9 | 44 | |
0f113f3e | 45 | BIO_get_cipher_ctx(b, &ctx); |
5c4436c9 | 46 | |
0f113f3e MC |
47 | if (enc) { |
48 | ciph = ec->cipher; | |
49 | /* | |
50 | * If not keeping key set cipher to NULL so subsequent calls decrypt. | |
51 | */ | |
52 | if (ec->key) | |
53 | ec->cipher = NULL; | |
54 | } else { | |
55 | ciph = EVP_get_cipherbyobj(calg->algorithm); | |
5c4436c9 | 56 | |
0f113f3e MC |
57 | if (!ciph) { |
58 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER); | |
59 | goto err; | |
60 | } | |
61 | } | |
5c4436c9 | 62 | |
0f113f3e MC |
63 | if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) { |
64 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
65 | CMS_R_CIPHER_INITIALISATION_ERROR); | |
66 | goto err; | |
67 | } | |
5c4436c9 | 68 | |
0f113f3e MC |
69 | if (enc) { |
70 | int ivlen; | |
71 | calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); | |
72 | /* Generate a random IV if we need one */ | |
73 | ivlen = EVP_CIPHER_CTX_iv_length(ctx); | |
74 | if (ivlen > 0) { | |
266483d2 | 75 | if (RAND_bytes(iv, ivlen) <= 0) |
0f113f3e MC |
76 | goto err; |
77 | piv = iv; | |
78 | } | |
79 | } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) { | |
80 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
81 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
82 | goto err; | |
83 | } | |
84 | tkeylen = EVP_CIPHER_CTX_key_length(ctx); | |
85 | /* Generate random session key */ | |
86 | if (!enc || !ec->key) { | |
87 | tkey = OPENSSL_malloc(tkeylen); | |
90945fa3 | 88 | if (tkey == NULL) { |
0f113f3e MC |
89 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
90 | goto err; | |
91 | } | |
92 | if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0) | |
93 | goto err; | |
94 | } | |
146b52ed | 95 | |
0f113f3e MC |
96 | if (!ec->key) { |
97 | ec->key = tkey; | |
98 | ec->keylen = tkeylen; | |
99 | tkey = NULL; | |
100 | if (enc) | |
101 | keep_key = 1; | |
102 | else | |
103 | ERR_clear_error(); | |
146b52ed | 104 | |
0f113f3e | 105 | } |
e540d1cd | 106 | |
0f113f3e MC |
107 | if (ec->keylen != tkeylen) { |
108 | /* If necessary set key length */ | |
109 | if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) { | |
110 | /* | |
111 | * Only reveal failure if debugging so we don't leak information | |
112 | * which may be useful in MMA. | |
113 | */ | |
114 | if (enc || ec->debug) { | |
115 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
116 | CMS_R_INVALID_KEY_LENGTH); | |
117 | goto err; | |
118 | } else { | |
119 | /* Use random key */ | |
4b45c6e5 | 120 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
121 | ec->key = tkey; |
122 | ec->keylen = tkeylen; | |
123 | tkey = NULL; | |
124 | ERR_clear_error(); | |
125 | } | |
126 | } | |
127 | } | |
5c4436c9 | 128 | |
0f113f3e MC |
129 | if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) { |
130 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
131 | CMS_R_CIPHER_INITIALISATION_ERROR); | |
132 | goto err; | |
133 | } | |
708cf5de DSH |
134 | if (enc) { |
135 | calg->parameter = ASN1_TYPE_new(); | |
136 | if (calg->parameter == NULL) { | |
137 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); | |
138 | goto err; | |
139 | } | |
140 | if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) { | |
141 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
142 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
143 | goto err; | |
144 | } | |
145 | /* If parameter type not set omit parameter */ | |
146 | if (calg->parameter->type == V_ASN1_UNDEF) { | |
147 | ASN1_TYPE_free(calg->parameter); | |
148 | calg->parameter = NULL; | |
149 | } | |
0f113f3e MC |
150 | } |
151 | ok = 1; | |
5c4436c9 | 152 | |
0f113f3e | 153 | err: |
891eac46 | 154 | if (!keep_key || !ok) { |
4b45c6e5 | 155 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
156 | ec->key = NULL; |
157 | } | |
4b45c6e5 | 158 | OPENSSL_clear_free(tkey, tkeylen); |
0f113f3e MC |
159 | if (ok) |
160 | return b; | |
161 | BIO_free(b); | |
162 | return NULL; | |
163 | } | |
164 | ||
165 | int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, | |
166 | const EVP_CIPHER *cipher, | |
167 | const unsigned char *key, size_t keylen) | |
168 | { | |
169 | ec->cipher = cipher; | |
170 | if (key) { | |
cdb10bae RS |
171 | if ((ec->key = OPENSSL_malloc(keylen)) == NULL) { |
172 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT, ERR_R_MALLOC_FAILURE); | |
0f113f3e | 173 | return 0; |
cdb10bae | 174 | } |
0f113f3e MC |
175 | memcpy(ec->key, key, keylen); |
176 | } | |
177 | ec->keylen = keylen; | |
178 | if (cipher) | |
179 | ec->contentType = OBJ_nid2obj(NID_pkcs7_data); | |
180 | return 1; | |
181 | } | |
320bfc1b DSH |
182 | |
183 | int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph, | |
0f113f3e MC |
184 | const unsigned char *key, size_t keylen) |
185 | { | |
186 | CMS_EncryptedContentInfo *ec; | |
187 | if (!key || !keylen) { | |
188 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY); | |
189 | return 0; | |
190 | } | |
191 | if (ciph) { | |
192 | cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData); | |
193 | if (!cms->d.encryptedData) { | |
194 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE); | |
195 | return 0; | |
196 | } | |
197 | cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted); | |
198 | cms->d.encryptedData->version = 0; | |
199 | } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) { | |
200 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA); | |
201 | return 0; | |
202 | } | |
203 | ec = cms->d.encryptedData->encryptedContentInfo; | |
204 | return cms_EncryptedContent_init(ec, ciph, key, keylen); | |
205 | } | |
320bfc1b | 206 | |
9fdcc21f | 207 | BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms) |
0f113f3e MC |
208 | { |
209 | CMS_EncryptedData *enc = cms->d.encryptedData; | |
210 | if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs) | |
211 | enc->version = 2; | |
212 | return cms_EncryptedContent_init_bio(enc->encryptedContentInfo); | |
213 | } |