kopia lustrzana https://github.com/ryukoposting/Signal-Android
295 wiersze
7.5 KiB
C
295 wiersze
7.5 KiB
C
/* 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_pseudo_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_cleanse(ec->key, ec->keylen);
|
|
OPENSSL_free(ec->key);
|
|
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 (ec->key && !keep_key)
|
|
{
|
|
OPENSSL_cleanse(ec->key, ec->keylen);
|
|
OPENSSL_free(ec->key);
|
|
ec->key = NULL;
|
|
}
|
|
if (tkey)
|
|
{
|
|
OPENSSL_cleanse(tkey, tkeylen);
|
|
OPENSSL_free(tkey);
|
|
}
|
|
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);
|
|
}
|