263 lines
7 KiB
C
263 lines
7 KiB
C
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/* $OpenBSD: cms_enc.c,v 1.20 2019/08/11 11:04:18 jsing Exp $ */
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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/* ====================================================================
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* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#include <string.h>
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#include "cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/pem.h>
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#include <openssl/x509v3.h>
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#include <openssl/err.h>
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#include <openssl/cms.h>
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#include <openssl/rand.h>
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#include "cms_lcl.h"
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/* CMS EncryptedData Utilities */
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/* Return BIO based on EncryptedContentInfo and key */
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BIO *
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cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
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{
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BIO *b;
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EVP_CIPHER_CTX *ctx;
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const EVP_CIPHER *ciph;
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X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
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unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
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unsigned char *tkey = NULL;
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size_t tkeylen = 0;
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int ok = 0;
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int enc, keep_key = 0;
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enc = ec->cipher ? 1 : 0;
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b = BIO_new(BIO_f_cipher());
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if (b == NULL) {
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CMSerror(ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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BIO_get_cipher_ctx(b, &ctx);
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if (enc) {
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ciph = ec->cipher;
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/*
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* If not keeping key set cipher to NULL so subsequent calls decrypt.
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*/
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if (ec->key)
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ec->cipher = NULL;
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} else {
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ciph = EVP_get_cipherbyobj(calg->algorithm);
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if (!ciph) {
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CMSerror(CMS_R_UNKNOWN_CIPHER);
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goto err;
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}
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}
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if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) {
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CMSerror(CMS_R_CIPHER_INITIALISATION_ERROR);
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goto err;
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}
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if (enc) {
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int ivlen;
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calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
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/* Generate a random IV if we need one */
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ivlen = EVP_CIPHER_CTX_iv_length(ctx);
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if (ivlen > 0) {
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arc4random_buf(iv, ivlen);
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piv = iv;
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}
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} else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) {
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CMSerror(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
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goto err;
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}
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tkeylen = EVP_CIPHER_CTX_key_length(ctx);
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/* Generate random session key */
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if (!enc || !ec->key) {
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tkey = malloc(tkeylen);
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if (tkey == NULL) {
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CMSerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
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goto err;
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}
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if (!ec->key) {
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ec->key = tkey;
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ec->keylen = tkeylen;
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tkey = NULL;
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if (enc)
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keep_key = 1;
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else
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ERR_clear_error();
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}
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if (ec->keylen != tkeylen) {
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/* If necessary set key length */
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if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
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/*
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* Only reveal failure if debugging so we don't leak information
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* which may be useful in MMA.
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*/
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if (enc || ec->debug) {
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CMSerror(CMS_R_INVALID_KEY_LENGTH);
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goto err;
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} else {
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/* Use random key */
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freezero(ec->key, ec->keylen);
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ec->key = tkey;
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ec->keylen = tkeylen;
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tkey = NULL;
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ERR_clear_error();
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}
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}
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}
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if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
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CMSerror(CMS_R_CIPHER_INITIALISATION_ERROR);
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goto err;
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}
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if (enc) {
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calg->parameter = ASN1_TYPE_new();
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if (calg->parameter == NULL) {
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CMSerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) {
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CMSerror(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
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goto err;
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}
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/* If parameter type not set omit parameter */
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if (calg->parameter->type == V_ASN1_UNDEF) {
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ASN1_TYPE_free(calg->parameter);
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calg->parameter = NULL;
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}
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}
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ok = 1;
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err:
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if (!keep_key || !ok) {
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freezero(ec->key, ec->keylen);
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ec->key = NULL;
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}
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freezero(tkey, tkeylen);
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if (ok)
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return b;
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BIO_free(b);
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return NULL;
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}
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int
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cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
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const EVP_CIPHER *cipher, const unsigned char *key, size_t keylen)
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{
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ec->cipher = cipher;
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if (key) {
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if ((ec->key = malloc(keylen)) == NULL) {
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CMSerror(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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memcpy(ec->key, key, keylen);
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}
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ec->keylen = keylen;
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if (cipher)
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ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
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return 1;
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}
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int
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CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
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const unsigned char *key, size_t keylen)
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{
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CMS_EncryptedContentInfo *ec;
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if (!key || !keylen) {
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CMSerror(CMS_R_NO_KEY);
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return 0;
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}
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if (ciph) {
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cms->d.encryptedData = (CMS_EncryptedData *)ASN1_item_new(&CMS_EncryptedData_it);
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if (!cms->d.encryptedData) {
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CMSerror(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
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cms->d.encryptedData->version = 0;
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} else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
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CMSerror(CMS_R_NOT_ENCRYPTED_DATA);
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return 0;
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}
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ec = cms->d.encryptedData->encryptedContentInfo;
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return cms_EncryptedContent_init(ec, ciph, key, keylen);
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}
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BIO *
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cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
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{
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CMS_EncryptedData *enc = cms->d.encryptedData;
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if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
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enc->version = 2;
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return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
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}
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