/*************************************************************************
* Copyright (C) 2004 Intel Corporation
*
* Licensed under the Apache License,  Version 2.0 (the "License");
* 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.
//     Big Number Operations
// 
//  Contents:
//     ippsSetOctString_BN()
// 
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"


/*F*
//    Name: ippsSetOctString_BN
//
// Purpose: Convert octet string into the BN value.
//
// Returns:                   Reason:
//    ippStsNullPtrErr           NULL == pOctStr
//                               NULL == pBN
//
//    ippStsContextMatchErr      !BN_VALID_ID(pBN)
//
//    ippStsLengthErr            0 > strLen
//
//    ippStsSizeErr              BN_ROOM(pBN) is enough for keep actual strLen
//
//    ippStsNoErr                no errors
//
// Parameters:
//    pOctStr     pointer to the source octet string
//    strLen      octet string length
//    pBN         pointer to the target BN
//
*F*/
IPPFUN(IppStatus, ippsSetOctString_BN, (const Ipp8u* pOctStr, int strLen, IppsBigNumState* pBN))
{
    IPP_BAD_PTR2_RET(pOctStr, pBN);

    IPP_BADARG_RET(!BN_VALID_ID(pBN), ippStsContextMatchErr);

    IPP_BADARG_RET((0 > strLen), ippStsLengthErr);

    /* remove leading zeros */
    while (strLen && (0 == pOctStr[0])) {
        strLen--;
        pOctStr++;
    }

    /* test BN size */
    IPP_BADARG_RET((int)((Ipp32s)sizeof(BNU_CHUNK_T) * BN_ROOM(pBN)) < strLen, ippStsSizeErr);
    if (strLen)
        BN_SIZE(pBN) = cpFromOctStr_BNU(BN_NUMBER(pBN), pOctStr, strLen);
    else {
        BN_NUMBER(pBN)[0] = (BNU_CHUNK_T)0;
        BN_SIZE(pBN)      = 1;
    }
    BN_SIGN(pBN) = ippBigNumPOS;

    return ippStsNoErr;
}
