1 /* crypto/cms/cms_pwri.c */
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 * ====================================================================
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 "asn1_locl.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)
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, int pbe_nid,
87 const EVP_CIPHER *kekciph)
89 CMS_RecipientInfo *ri = NULL;
90 CMS_EnvelopedData *env;
91 CMS_PasswordRecipientInfo *pwri;
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;
113 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
116 if (wrap_nid != NID_id_alg_PWRI_KEK)
118 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
119 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
123 /* Setup algorithm identifier for cipher */
124 encalg = X509_ALGOR_new();
125 EVP_CIPHER_CTX_init(&ctx);
127 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);
137 if (RAND_pseudo_bytes(iv, ivlen) <= 0)
139 if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0)
141 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
145 encalg->parameter = ASN1_TYPE_new();
146 if (!encalg->parameter)
148 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
149 ERR_R_MALLOC_FAILURE);
152 if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0)
154 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
155 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
161 encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx));
163 EVP_CIPHER_CTX_cleanup(&ctx);
165 /* Initialize recipient info */
166 ri = M_ASN1_new_of(CMS_RecipientInfo);
170 ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
173 ri->type = CMS_RECIPINFO_PASS;
176 /* Since this is overwritten, free up empty structure already there */
177 X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
178 pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
179 if (!pwri->keyEncryptionAlgorithm)
181 pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
182 pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
183 if (!pwri->keyEncryptionAlgorithm->parameter)
186 if(!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
187 &pwri->keyEncryptionAlgorithm->parameter->value.sequence))
189 pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
191 X509_ALGOR_free(encalg);
194 /* Setup PBE algorithm */
196 pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
198 if (!pwri->keyDerivationAlgorithm)
201 CMS_RecipientInfo_set0_password(ri, pass, passlen);
204 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
210 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
212 EVP_CIPHER_CTX_cleanup(&ctx);
214 M_ASN1_free_of(ri, CMS_RecipientInfo);
216 X509_ALGOR_free(encalg);
221 /* This is an implementation of the key wrapping mechanism in RFC3211,
222 * at some point this should go into EVP.
225 static int kek_unwrap_key(unsigned char *out, size_t *outlen,
226 const unsigned char *in, size_t inlen, EVP_CIPHER_CTX *ctx)
228 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
231 if (inlen < 2 * blocklen)
236 if (inlen % blocklen)
241 tmp = OPENSSL_malloc(inlen);
242 /* setup IV by decrypting last two blocks */
243 EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
244 in + inlen - 2 * blocklen, blocklen * 2);
245 /* Do a decrypt of last decrypted block to set IV to correct value
246 * output it to start of buffer so we don't corrupt decrypted block
247 * this works because buffer is at least two block lengths long.
249 EVP_DecryptUpdate(ctx, tmp, &outl,
250 tmp + inlen - blocklen, blocklen);
251 /* Can now decrypt first n - 1 blocks */
252 EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen);
254 /* Reset IV to original value */
255 EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
257 EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen);
258 /* Check check bytes */
259 if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff)
261 /* Check byte failure */
264 if (inlen < (size_t)(tmp[0] - 4 ))
266 /* Invalid length value */
269 *outlen = (size_t)tmp[0];
270 memcpy(out, tmp + 4, *outlen);
273 OPENSSL_cleanse(tmp, inlen);
279 static int kek_wrap_key(unsigned char *out, size_t *outlen,
280 const unsigned char *in, size_t inlen, EVP_CIPHER_CTX *ctx)
282 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
285 /* First decide length of output buffer: need header and round up to
286 * multiple of block length.
288 olen = (inlen + 4 + blocklen - 1)/blocklen;
290 if (olen < 2 * blocklen)
303 out[0] = (unsigned char)inlen;
304 out[1] = in[0] ^ 0xFF;
305 out[2] = in[1] ^ 0xFF;
306 out[3] = in[2] ^ 0xFF;
307 memcpy(out + 4, in, inlen);
308 /* Add random padding to end */
309 if (olen > inlen + 4)
310 RAND_pseudo_bytes(out + 4 + inlen, olen - 4 - inlen);
312 EVP_EncryptUpdate(ctx, out, &dummy, out, olen);
313 EVP_EncryptUpdate(ctx, out, &dummy, out, olen);
321 /* Encrypt/Decrypt content key in PWRI recipient info */
323 int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
326 CMS_EncryptedContentInfo *ec;
327 CMS_PasswordRecipientInfo *pwri;
328 const unsigned char *p = NULL;
331 X509_ALGOR *algtmp, *kekalg = NULL;
332 EVP_CIPHER_CTX kekctx;
333 const EVP_CIPHER *kekcipher;
334 unsigned char *key = NULL;
337 ec = cms->d.envelopedData->encryptedContentInfo;
340 EVP_CIPHER_CTX_init(&kekctx);
344 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
347 algtmp = pwri->keyEncryptionAlgorithm;
349 if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK)
351 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
352 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
356 if (algtmp->parameter->type == V_ASN1_SEQUENCE)
358 p = algtmp->parameter->value.sequence->data;
359 plen = algtmp->parameter->value.sequence->length;
360 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
364 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
365 CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
369 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
373 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
374 CMS_R_UNKNOWN_CIPHER);
378 /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
379 if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de))
381 EVP_CIPHER_CTX_set_padding(&kekctx, 0);
382 if(EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0)
384 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
385 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
389 algtmp = pwri->keyDerivationAlgorithm;
391 /* Finish password based key derivation to setup key in "ctx" */
393 if (EVP_PBE_CipherInit(algtmp->algorithm,
394 (char *)pwri->pass, pwri->passlen,
395 algtmp->parameter, &kekctx, en_de) < 0)
397 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
401 /* Finally wrap/unwrap the key */
406 if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx))
409 key = OPENSSL_malloc(keylen);
414 if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx))
416 pwri->encryptedKey->data = key;
417 pwri->encryptedKey->length = keylen;
421 key = OPENSSL_malloc(pwri->encryptedKey->length);
425 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
426 ERR_R_MALLOC_FAILURE);
429 if (!kek_unwrap_key(key, &keylen,
430 pwri->encryptedKey->data,
431 pwri->encryptedKey->length, &kekctx))
433 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
434 CMS_R_UNWRAP_FAILURE);
447 EVP_CIPHER_CTX_cleanup(&kekctx);
451 X509_ALGOR_free(kekalg);