| /* crypto/cms/cms_enc.c */ |
| /* |
| * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| * project. |
| */ |
| /* ==================================================================== |
| * Copyright (c) 2008 The OpenSSL Project. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. All advertising materials mentioning features or use of this |
| * software must display the following acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * licensing@OpenSSL.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * ==================================================================== |
| */ |
| |
| #include "cryptlib.h" |
| #include <openssl/asn1t.h> |
| #include <openssl/pem.h> |
| #include <openssl/x509v3.h> |
| #include <openssl/err.h> |
| #include <openssl/cms.h> |
| #include <openssl/rand.h> |
| #include "cms_lcl.h" |
| |
| /* CMS EncryptedData Utilities */ |
| |
| DECLARE_ASN1_ITEM(CMS_EncryptedData) |
| |
| /* Return BIO based on EncryptedContentInfo and key */ |
| |
| BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec) |
| { |
| BIO *b; |
| EVP_CIPHER_CTX *ctx; |
| const EVP_CIPHER *ciph; |
| X509_ALGOR *calg = ec->contentEncryptionAlgorithm; |
| unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL; |
| unsigned char *tkey = NULL; |
| size_t tkeylen = 0; |
| |
| int ok = 0; |
| |
| int enc, keep_key = 0; |
| |
| enc = ec->cipher ? 1 : 0; |
| |
| b = BIO_new(BIO_f_cipher()); |
| if (!b) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| BIO_get_cipher_ctx(b, &ctx); |
| |
| if (enc) { |
| ciph = ec->cipher; |
| /* |
| * If not keeping key set cipher to NULL so subsequent calls decrypt. |
| */ |
| if (ec->key) |
| ec->cipher = NULL; |
| } else { |
| ciph = EVP_get_cipherbyobj(calg->algorithm); |
| |
| if (!ciph) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER); |
| goto err; |
| } |
| } |
| |
| if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, |
| CMS_R_CIPHER_INITIALISATION_ERROR); |
| goto err; |
| } |
| |
| if (enc) { |
| int ivlen; |
| calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); |
| /* Generate a random IV if we need one */ |
| ivlen = EVP_CIPHER_CTX_iv_length(ctx); |
| if (ivlen > 0) { |
| if (RAND_bytes(iv, ivlen) <= 0) |
| goto err; |
| piv = iv; |
| } |
| } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, |
| CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
| goto err; |
| } |
| tkeylen = EVP_CIPHER_CTX_key_length(ctx); |
| /* Generate random session key */ |
| if (!enc || !ec->key) { |
| tkey = OPENSSL_malloc(tkeylen); |
| if (!tkey) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0) |
| goto err; |
| } |
| |
| if (!ec->key) { |
| ec->key = tkey; |
| ec->keylen = tkeylen; |
| tkey = NULL; |
| if (enc) |
| keep_key = 1; |
| else |
| ERR_clear_error(); |
| |
| } |
| |
| if (ec->keylen != tkeylen) { |
| /* If necessary set key length */ |
| if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) { |
| /* |
| * Only reveal failure if debugging so we don't leak information |
| * which may be useful in MMA. |
| */ |
| if (enc || ec->debug) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, |
| CMS_R_INVALID_KEY_LENGTH); |
| goto err; |
| } else { |
| /* Use random key */ |
| OPENSSL_clear_free(ec->key, ec->keylen); |
| ec->key = tkey; |
| ec->keylen = tkeylen; |
| tkey = NULL; |
| ERR_clear_error(); |
| } |
| } |
| } |
| |
| if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, |
| CMS_R_CIPHER_INITIALISATION_ERROR); |
| goto err; |
| } |
| |
| if (piv) { |
| calg->parameter = ASN1_TYPE_new(); |
| if (!calg->parameter) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, |
| CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
| goto err; |
| } |
| } |
| ok = 1; |
| |
| err: |
| if (!keep_key) { |
| OPENSSL_clear_free(ec->key, ec->keylen); |
| ec->key = NULL; |
| } |
| OPENSSL_clear_free(tkey, tkeylen); |
| if (ok) |
| return b; |
| BIO_free(b); |
| return NULL; |
| } |
| |
| int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, |
| const EVP_CIPHER *cipher, |
| const unsigned char *key, size_t keylen) |
| { |
| ec->cipher = cipher; |
| if (key) { |
| ec->key = OPENSSL_malloc(keylen); |
| if (!ec->key) |
| return 0; |
| memcpy(ec->key, key, keylen); |
| } |
| ec->keylen = keylen; |
| if (cipher) |
| ec->contentType = OBJ_nid2obj(NID_pkcs7_data); |
| return 1; |
| } |
| |
| int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph, |
| const unsigned char *key, size_t keylen) |
| { |
| CMS_EncryptedContentInfo *ec; |
| if (!key || !keylen) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY); |
| return 0; |
| } |
| if (ciph) { |
| cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData); |
| if (!cms->d.encryptedData) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted); |
| cms->d.encryptedData->version = 0; |
| } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) { |
| CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA); |
| return 0; |
| } |
| ec = cms->d.encryptedData->encryptedContentInfo; |
| return cms_EncryptedContent_init(ec, ciph, key, keylen); |
| } |
| |
| BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms) |
| { |
| CMS_EncryptedData *enc = cms->d.encryptedData; |
| if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs) |
| enc->version = 2; |
| return cms_EncryptedContent_init_bio(enc->encryptedContentInfo); |
| } |
