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source: vbox/trunk/src/libs/openssl-3.0.7/crypto/cms/cms_enc.c@ 98024

Last change on this file since 98024 was 97372, checked in by vboxsync, 2 years ago

libs: Switch to openssl-3.0.7, bugref:10317
File size: 7.8 KB
Line 
1/*
2 * Copyright 2008-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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 "internal/cryptlib.h"
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 "crypto/evp.h"
18#include "cms_local.h"
19
20/* CMS EncryptedData Utilities */
21
22/* Return BIO based on EncryptedContentInfo and key */
23
24BIO *ossl_cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec,
25 const CMS_CTX *cms_ctx)
26{
27 BIO *b;
28 EVP_CIPHER_CTX *ctx;
29 EVP_CIPHER *fetched_ciph = NULL;
30 const EVP_CIPHER *cipher = NULL;
31 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
32 evp_cipher_aead_asn1_params aparams;
33 unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
34 unsigned char *tkey = NULL;
35 int len;
36 int ivlen = 0;
37 size_t tkeylen = 0;
38 int ok = 0;
39 int enc, keep_key = 0;
40 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(cms_ctx);
41 const char *propq = ossl_cms_ctx_get0_propq(cms_ctx);
42
43 enc = ec->cipher ? 1 : 0;
44
45 b = BIO_new(BIO_f_cipher());
46 if (b == NULL) {
47 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
48 return NULL;
49 }
50
51 BIO_get_cipher_ctx(b, &ctx);
52
53 (void)ERR_set_mark();
54 if (enc) {
55 cipher = ec->cipher;
56 /*
57 * If not keeping key set cipher to NULL so subsequent calls decrypt.
58 */
59 if (ec->key != NULL)
60 ec->cipher = NULL;
61 } else {
62 cipher = EVP_get_cipherbyobj(calg->algorithm);
63 }
64 if (cipher != NULL) {
65 fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_get0_name(cipher),
66 propq);
67 if (fetched_ciph != NULL)
68 cipher = fetched_ciph;
69 }
70 if (cipher == NULL) {
71 (void)ERR_clear_last_mark();
72 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
73 goto err;
74 }
75 (void)ERR_pop_to_mark();
76
77 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
78 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
79 goto err;
80 }
81
82 if (enc) {
83 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_get_type(ctx));
84 /* Generate a random IV if we need one */
85 ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
86 if (ivlen < 0) {
87 ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
88 goto err;
89 }
90
91 if (ivlen > 0) {
92 if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
93 goto err;
94 piv = iv;
95 }
96 } else {
97 if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
98 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
99 goto err;
100 }
101 if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
102 piv = aparams.iv;
103 if (ec->taglen > 0
104 && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
105 ec->taglen, ec->tag) <= 0) {
106 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
107 goto err;
108 }
109 }
110 }
111 len = EVP_CIPHER_CTX_get_key_length(ctx);
112 if (len <= 0)
113 goto err;
114 tkeylen = (size_t)len;
115
116 /* Generate random session key */
117 if (!enc || !ec->key) {
118 tkey = OPENSSL_malloc(tkeylen);
119 if (tkey == NULL) {
120 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
121 goto err;
122 }
123 if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
124 goto err;
125 }
126
127 if (!ec->key) {
128 ec->key = tkey;
129 ec->keylen = tkeylen;
130 tkey = NULL;
131 if (enc)
132 keep_key = 1;
133 else
134 ERR_clear_error();
135
136 }
137
138 if (ec->keylen != tkeylen) {
139 /* If necessary set key length */
140 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
141 /*
142 * Only reveal failure if debugging so we don't leak information
143 * which may be useful in MMA.
144 */
145 if (enc || ec->debug) {
146 ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
147 goto err;
148 } else {
149 /* Use random key */
150 OPENSSL_clear_free(ec->key, ec->keylen);
151 ec->key = tkey;
152 ec->keylen = tkeylen;
153 tkey = NULL;
154 ERR_clear_error();
155 }
156 }
157 }
158
159 if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
160 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
161 goto err;
162 }
163 if (enc) {
164 calg->parameter = ASN1_TYPE_new();
165 if (calg->parameter == NULL) {
166 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
167 goto err;
168 }
169 if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
170 memcpy(aparams.iv, piv, ivlen);
171 aparams.iv_len = ivlen;
172 aparams.tag_len = EVP_CIPHER_CTX_get_tag_length(ctx);
173 if (aparams.tag_len <= 0)
174 goto err;
175 }
176
177 if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
178 ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
179 goto err;
180 }
181 /* If parameter type not set omit parameter */
182 if (calg->parameter->type == V_ASN1_UNDEF) {
183 ASN1_TYPE_free(calg->parameter);
184 calg->parameter = NULL;
185 }
186 }
187 ok = 1;
188
189 err:
190 EVP_CIPHER_free(fetched_ciph);
191 if (!keep_key || !ok) {
192 OPENSSL_clear_free(ec->key, ec->keylen);
193 ec->key = NULL;
194 }
195 OPENSSL_clear_free(tkey, tkeylen);
196 if (ok)
197 return b;
198 BIO_free(b);
199 return NULL;
200}
201
202int ossl_cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
203 const EVP_CIPHER *cipher,
204 const unsigned char *key, size_t keylen,
205 const CMS_CTX *cms_ctx)
206{
207 ec->cipher = cipher;
208 if (key) {
209 if ((ec->key = OPENSSL_malloc(keylen)) == NULL) {
210 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
211 return 0;
212 }
213 memcpy(ec->key, key, keylen);
214 }
215 ec->keylen = keylen;
216 if (cipher != NULL)
217 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
218 return 1;
219}
220
221int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
222 const unsigned char *key, size_t keylen)
223{
224 CMS_EncryptedContentInfo *ec;
225
226 if (!key || !keylen) {
227 ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
228 return 0;
229 }
230 if (ciph) {
231 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
232 if (!cms->d.encryptedData) {
233 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
234 return 0;
235 }
236 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
237 cms->d.encryptedData->version = 0;
238 } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
239 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA);
240 return 0;
241 }
242 ec = cms->d.encryptedData->encryptedContentInfo;
243 return ossl_cms_EncryptedContent_init(ec, ciph, key, keylen,
244 ossl_cms_get0_cmsctx(cms));
245}
246
247BIO *ossl_cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
248{
249 CMS_EncryptedData *enc = cms->d.encryptedData;
250 if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
251 enc->version = 2;
252 return ossl_cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
253 ossl_cms_get0_cmsctx(cms));
254}
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