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openssl/crypto/cms/cms_enc.c

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/* 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);
}
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