2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2009 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
54 #include "internal/cryptlib.h"
55 #include <openssl/asn1t.h>
56 #include <openssl/pem.h>
57 #include <openssl/x509v3.h>
58 #include <openssl/err.h>
59 #include <openssl/cms.h>
60 #include <openssl/rand.h>
61 #include <openssl/aes.h>
63 #include "internal/asn1_int.h"
65 int CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri,
66 unsigned char *pass, ossl_ssize_t passlen)
68 CMS_PasswordRecipientInfo *pwri;
69 if (ri->type != CMS_RECIPINFO_PASS) {
70 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI);
76 if (pass && passlen < 0)
77 passlen = strlen((char *)pass);
78 pwri->passlen = passlen;
82 CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms,
83 int iter, int wrap_nid,
87 const EVP_CIPHER *kekciph)
89 CMS_RecipientInfo *ri = NULL;
90 CMS_EnvelopedData *env;
91 CMS_PasswordRecipientInfo *pwri;
92 EVP_CIPHER_CTX *ctx = NULL;
93 X509_ALGOR *encalg = NULL;
94 unsigned char iv[EVP_MAX_IV_LENGTH];
97 env = cms_get0_enveloped(cms);
102 wrap_nid = NID_id_alg_PWRI_KEK;
105 pbe_nid = NID_id_pbkdf2;
107 /* Get from enveloped data */
109 kekciph = env->encryptedContentInfo->cipher;
111 if (kekciph == NULL) {
112 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
115 if (wrap_nid != NID_id_alg_PWRI_KEK) {
116 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
117 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
121 /* Setup algorithm identifier for cipher */
122 encalg = X509_ALGOR_new();
123 if (encalg == NULL) {
126 ctx = EVP_CIPHER_CTX_new();
128 if (EVP_EncryptInit_ex(ctx, kekciph, NULL, NULL, NULL) <= 0) {
129 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
133 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
136 if (RAND_bytes(iv, ivlen) <= 0)
138 if (EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, iv) <= 0) {
139 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
142 encalg->parameter = ASN1_TYPE_new();
143 if (!encalg->parameter) {
144 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
147 if (EVP_CIPHER_param_to_asn1(ctx, encalg->parameter) <= 0) {
148 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
149 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
154 encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
156 EVP_CIPHER_CTX_free(ctx);
159 /* Initialize recipient info */
160 ri = M_ASN1_new_of(CMS_RecipientInfo);
164 ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
165 if (ri->d.pwri == NULL)
167 ri->type = CMS_RECIPINFO_PASS;
170 /* Since this is overwritten, free up empty structure already there */
171 X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
172 pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
173 if (pwri->keyEncryptionAlgorithm == NULL)
175 pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
176 pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
177 if (pwri->keyEncryptionAlgorithm->parameter == NULL)
180 if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
181 &pwri->keyEncryptionAlgorithm->parameter->
184 pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
186 X509_ALGOR_free(encalg);
189 /* Setup PBE algorithm */
191 pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
193 if (!pwri->keyDerivationAlgorithm)
196 CMS_RecipientInfo_set0_password(ri, pass, passlen);
199 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
205 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
207 EVP_CIPHER_CTX_free(ctx);
209 M_ASN1_free_of(ri, CMS_RecipientInfo);
210 X509_ALGOR_free(encalg);
216 * This is an implementation of the key wrapping mechanism in RFC3211, at
217 * some point this should go into EVP.
220 static int kek_unwrap_key(unsigned char *out, size_t *outlen,
221 const unsigned char *in, size_t inlen,
224 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
227 if (inlen < 2 * blocklen) {
231 if (inlen % blocklen) {
235 tmp = OPENSSL_malloc(inlen);
238 /* setup IV by decrypting last two blocks */
239 if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
240 in + inlen - 2 * blocklen, blocklen * 2)
242 * Do a decrypt of last decrypted block to set IV to correct value
243 * output it to start of buffer so we don't corrupt decrypted block
244 * this works because buffer is at least two block lengths long.
246 || !EVP_DecryptUpdate(ctx, tmp, &outl,
247 tmp + inlen - blocklen, blocklen)
248 /* Can now decrypt first n - 1 blocks */
249 || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)
251 /* Reset IV to original value */
252 || !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)
254 || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))
256 /* Check check bytes */
257 if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {
258 /* Check byte failure */
261 if (inlen < (size_t)(tmp[0] - 4)) {
262 /* Invalid length value */
265 *outlen = (size_t)tmp[0];
266 memcpy(out, tmp + 4, *outlen);
269 OPENSSL_clear_free(tmp, inlen);
274 static int kek_wrap_key(unsigned char *out, size_t *outlen,
275 const unsigned char *in, size_t inlen,
278 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
282 * First decide length of output buffer: need header and round up to
283 * multiple of block length.
285 olen = (inlen + 4 + blocklen - 1) / blocklen;
287 if (olen < 2 * blocklen) {
297 out[0] = (unsigned char)inlen;
298 out[1] = in[0] ^ 0xFF;
299 out[2] = in[1] ^ 0xFF;
300 out[3] = in[2] ^ 0xFF;
301 memcpy(out + 4, in, inlen);
302 /* Add random padding to end */
304 && RAND_bytes(out + 4 + inlen, olen - 4 - inlen) <= 0)
307 if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen)
308 || !EVP_EncryptUpdate(ctx, out, &dummy, out, olen))
317 /* Encrypt/Decrypt content key in PWRI recipient info */
319 int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
322 CMS_EncryptedContentInfo *ec;
323 CMS_PasswordRecipientInfo *pwri;
325 X509_ALGOR *algtmp, *kekalg = NULL;
326 EVP_CIPHER_CTX *kekctx;
327 const EVP_CIPHER *kekcipher;
328 unsigned char *key = NULL;
331 ec = cms->d.envelopedData->encryptedContentInfo;
334 kekctx = EVP_CIPHER_CTX_new();
337 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
340 algtmp = pwri->keyEncryptionAlgorithm;
342 if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {
343 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
344 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
348 kekalg = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
351 if (kekalg == NULL) {
352 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
353 CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
357 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
360 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER);
364 /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
365 if (!EVP_CipherInit_ex(kekctx, kekcipher, NULL, NULL, NULL, en_de))
367 EVP_CIPHER_CTX_set_padding(kekctx, 0);
368 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) < 0) {
369 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
370 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
374 algtmp = pwri->keyDerivationAlgorithm;
376 /* Finish password based key derivation to setup key in "ctx" */
378 if (EVP_PBE_CipherInit(algtmp->algorithm,
379 (char *)pwri->pass, pwri->passlen,
380 algtmp->parameter, kekctx, en_de) < 0) {
381 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
385 /* Finally wrap/unwrap the key */
389 if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, kekctx))
392 key = OPENSSL_malloc(keylen);
397 if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, kekctx))
399 pwri->encryptedKey->data = key;
400 pwri->encryptedKey->length = keylen;
402 key = OPENSSL_malloc(pwri->encryptedKey->length);
405 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE);
408 if (!kek_unwrap_key(key, &keylen,
409 pwri->encryptedKey->data,
410 pwri->encryptedKey->length, kekctx)) {
411 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE);
424 EVP_CIPHER_CTX_free(kekctx);
428 X509_ALGOR_free(kekalg);