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/*******************************************************************************
* Copyright 2013-2018 Intel Corporation
* All Rights Reserved.
*
* If this software was obtained under the Intel Simplified Software License,
* the following terms apply:
*
* The source code, information and material ("Material") contained herein is
* owned by Intel Corporation or its suppliers or licensors, and title to such
* Material remains with Intel Corporation or its suppliers or licensors. The
* Material contains proprietary information of Intel or its suppliers and
* licensors. The Material is protected by worldwide copyright laws and treaty
* provisions. No part of the Material may be used, copied, reproduced,
* modified, published, uploaded, posted, transmitted, distributed or disclosed
* in any way without Intel's prior express written permission. No license under
* any patent, copyright or other intellectual property rights in the Material
* is granted to or conferred upon you, either expressly, by implication,
* inducement, estoppel or otherwise. Any license under such intellectual
* property rights must be express and approved by Intel in writing.
*
* Unless otherwise agreed by Intel in writing, you may not remove or alter this
* notice or any other notice embedded in Materials by Intel or Intel's
* suppliers or licensors in any way.
*
*
* If this software was obtained under the Apache License, Version 2.0 (the
* "License"), the following terms apply:
*
* You may not use this file except in compliance with the License. You may
* obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
/*
//
// Purpose:
// Cryptography Primitive.
// RSASSA-PKCS-v1_5
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpngrsa.h"
#include "pcphash.h"
#include "pcptool.h"
#include "pcprsa_emsa_pkcs1v15.h"
static int GenerateSing(const Ipp8u* pMsg, int msgLen, /* message representation */
const Ipp8u* pSalt, int saltLen, /* fied string */
Ipp8u* pSign,
const IppsRSAPrivateKeyState* pPrvKey,
const IppsRSAPublicKeyState* pPubKey,
BNU_CHUNK_T* pBuffer)
{
/* size of RSA modulus in bytes and chunks */
cpSize rsaBits = RSA_PRV_KEY_BITSIZE_N(pPrvKey);
cpSize k = BITS2WORD8_SIZE(rsaBits);
cpSize nsN = BITS_BNU_CHUNK(rsaBits);
/* EMSA-PKCS-v1_5 encoding */
int result = EMSA_PKCSv15(pMsg, msgLen, pSalt, saltLen, pSign, k);
if (result) {
/* temporary BNs */
__ALIGN8 IppsBigNumState bnC;
__ALIGN8 IppsBigNumState bnP;
/* make BNs */
BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnC);
pBuffer += (nsN + 1) * 2;
BN_Make(pBuffer, pBuffer + nsN + 1, nsN, &bnP);
pBuffer += (nsN + 1) * 2;
/*
// private-key operation
*/
ippsSetOctString_BN(pSign, k, &bnC);
if (RSA_PRV_KEY1_VALID_ID(pPrvKey))
gsRSAprv_cipher(&bnP, &bnC, pPrvKey, pBuffer);
else
gsRSAprv_cipher_crt(&bnP, &bnC, pPrvKey, pBuffer);
ippsGetOctString_BN(pSign, k, &bnP);
/* check the result before send it out (fault attack mitigatioin) */
if (pPubKey) {
gsRSApub_cipher(&bnP, &bnP, pPubKey, pBuffer);
/* check signature before send it out (fault attack mitigatioin) */
if (0 != cpBN_cmp(&bnP, &bnC)) {
PaddBlock(0, pSign, k);
result = 0;
}
}
}
return result;
}
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