1 /* crypto/cms/cms_pwri.c */
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 /* ====================================================================
7 * Copyright (c) 2009 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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)
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50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
55 #include "internal/cryptlib.h"
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 <openssl/aes.h>
64 #include "internal/asn1_int.h"
66 int CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri,
67 unsigned char *pass, ossl_ssize_t passlen)
69 CMS_PasswordRecipientInfo *pwri;
70 if (ri->type != CMS_RECIPINFO_PASS) {
71 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI);
77 if (pass && passlen < 0)
78 passlen = strlen((char *)pass);
79 pwri->passlen = passlen;
83 CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms,
84 int iter, int wrap_nid,
88 const EVP_CIPHER *kekciph)
90 CMS_RecipientInfo *ri = NULL;
91 CMS_EnvelopedData *env;
92 CMS_PasswordRecipientInfo *pwri;
94 X509_ALGOR *encalg = NULL;
95 unsigned char iv[EVP_MAX_IV_LENGTH];
98 env = cms_get0_enveloped(cms);
103 wrap_nid = NID_id_alg_PWRI_KEK;
106 pbe_nid = NID_id_pbkdf2;
108 /* Get from enveloped data */
110 kekciph = env->encryptedContentInfo->cipher;
112 if (kekciph == NULL) {
113 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
116 if (wrap_nid != NID_id_alg_PWRI_KEK) {
117 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
118 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
122 /* Setup algorithm identifier for cipher */
123 encalg = X509_ALGOR_new();
124 EVP_CIPHER_CTX_init(&ctx);
126 if (EVP_EncryptInit_ex(&ctx, kekciph, NULL, NULL, NULL) <= 0) {
127 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
131 ivlen = EVP_CIPHER_CTX_iv_length(&ctx);
134 if (RAND_bytes(iv, ivlen) <= 0)
136 if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0) {
137 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
140 encalg->parameter = ASN1_TYPE_new();
141 if (!encalg->parameter) {
142 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
145 if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0) {
146 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
147 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
152 encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx));
154 EVP_CIPHER_CTX_cleanup(&ctx);
156 /* Initialize recipient info */
157 ri = M_ASN1_new_of(CMS_RecipientInfo);
161 ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
164 ri->type = CMS_RECIPINFO_PASS;
167 /* Since this is overwritten, free up empty structure already there */
168 X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
169 pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
170 if (!pwri->keyEncryptionAlgorithm)
172 pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
173 pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
174 if (!pwri->keyEncryptionAlgorithm->parameter)
177 if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
178 &pwri->keyEncryptionAlgorithm->parameter->
181 pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
183 X509_ALGOR_free(encalg);
186 /* Setup PBE algorithm */
188 pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
190 if (!pwri->keyDerivationAlgorithm)
193 CMS_RecipientInfo_set0_password(ri, pass, passlen);
196 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
202 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
204 EVP_CIPHER_CTX_cleanup(&ctx);
206 M_ASN1_free_of(ri, CMS_RecipientInfo);
207 X509_ALGOR_free(encalg);
213 * This is an implementation of the key wrapping mechanism in RFC3211, at
214 * some point this should go into EVP.
217 static int kek_unwrap_key(unsigned char *out, size_t *outlen,
218 const unsigned char *in, size_t inlen,
221 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
224 if (inlen < 2 * blocklen) {
228 if (inlen % blocklen) {
232 tmp = OPENSSL_malloc(inlen);
235 /* setup IV by decrypting last two blocks */
236 if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
237 in + inlen - 2 * blocklen, blocklen * 2)
239 * Do a decrypt of last decrypted block to set IV to correct value
240 * output it to start of buffer so we don't corrupt decrypted block
241 * this works because buffer is at least two block lengths long.
243 || !EVP_DecryptUpdate(ctx, tmp, &outl,
244 tmp + inlen - blocklen, blocklen)
245 /* Can now decrypt first n - 1 blocks */
246 || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)
248 /* Reset IV to original value */
249 || !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)
251 || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))
253 /* Check check bytes */
254 if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {
255 /* Check byte failure */
258 if (inlen < (size_t)(tmp[0] - 4)) {
259 /* Invalid length value */
262 *outlen = (size_t)tmp[0];
263 memcpy(out, tmp + 4, *outlen);
266 OPENSSL_clear_free(tmp, inlen);
271 static int kek_wrap_key(unsigned char *out, size_t *outlen,
272 const unsigned char *in, size_t inlen,
275 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
279 * First decide length of output buffer: need header and round up to
280 * multiple of block length.
282 olen = (inlen + 4 + blocklen - 1) / blocklen;
284 if (olen < 2 * blocklen) {
294 out[0] = (unsigned char)inlen;
295 out[1] = in[0] ^ 0xFF;
296 out[2] = in[1] ^ 0xFF;
297 out[3] = in[2] ^ 0xFF;
298 memcpy(out + 4, in, inlen);
299 /* Add random padding to end */
301 && RAND_bytes(out + 4 + inlen, olen - 4 - inlen) <= 0)
304 if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen)
305 || !EVP_EncryptUpdate(ctx, out, &dummy, out, olen))
314 /* Encrypt/Decrypt content key in PWRI recipient info */
316 int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
319 CMS_EncryptedContentInfo *ec;
320 CMS_PasswordRecipientInfo *pwri;
322 X509_ALGOR *algtmp, *kekalg = NULL;
323 EVP_CIPHER_CTX kekctx;
324 const EVP_CIPHER *kekcipher;
325 unsigned char *key = NULL;
328 ec = cms->d.envelopedData->encryptedContentInfo;
331 EVP_CIPHER_CTX_init(&kekctx);
334 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
337 algtmp = pwri->keyEncryptionAlgorithm;
339 if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {
340 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
341 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
345 kekalg = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
348 if (kekalg == NULL) {
349 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
350 CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
354 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
357 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER);
361 /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
362 if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de))
364 EVP_CIPHER_CTX_set_padding(&kekctx, 0);
365 if (EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0) {
366 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
367 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
371 algtmp = pwri->keyDerivationAlgorithm;
373 /* Finish password based key derivation to setup key in "ctx" */
375 if (EVP_PBE_CipherInit(algtmp->algorithm,
376 (char *)pwri->pass, pwri->passlen,
377 algtmp->parameter, &kekctx, en_de) < 0) {
378 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
382 /* Finally wrap/unwrap the key */
386 if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx))
389 key = OPENSSL_malloc(keylen);
394 if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx))
396 pwri->encryptedKey->data = key;
397 pwri->encryptedKey->length = keylen;
399 key = OPENSSL_malloc(pwri->encryptedKey->length);
402 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE);
405 if (!kek_unwrap_key(key, &keylen,
406 pwri->encryptedKey->data,
407 pwri->encryptedKey->length, &kekctx)) {
408 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE);
421 EVP_CIPHER_CTX_cleanup(&kekctx);
425 X509_ALGOR_free(kekalg);