ext/ipp/sources/ippcp/pcpbninit.c

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/*
//               Intel(R) Integrated Performance Primitives
//                   Cryptographic Primitives (ippcp)
//
//  Contents:
//     ippsBigNumGetSize()
//     ippsBigNumInit()
//
*/

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

/*F*
//    Name: ippsBigNumInit
//
// Purpose: Init BigNum spec for future usage.
//
// Returns:                Reason:
//    ippStsNullPtrErr        pBN == NULL
//    ippStsLengthErr         length<1
//                            length > BITS2WORD32_SIZE(BN_MAXBITSIZE)
//    ippStsNoErr             no errors
//
// Parameters:
//    length    max BN length (32-bits segments)
//    pBN      BigNum ctx
//
*F*/
IPPFUN(IppStatus, ippsBigNumInit, (int length, IppsBigNumState* pBN))
{
    IPP_BADARG_RET(length<1 || length>BITS2WORD32_SIZE(BN_MAXBITSIZE), ippStsLengthErr);
    IPP_BAD_PTR1_RET(pBN);
    pBN = (IppsBigNumState*)(IPP_ALIGNED_PTR(pBN, BN_ALIGNMENT));

    {
        Ipp8u* ptr = (Ipp8u*)pBN;

        /* convert length to the number of BNU_CHUNK_T */
        cpSize len = INTERNAL_BNU_LENGTH(length);

        BN_ID(pBN) = idCtxUnknown;
        BN_SIGN(pBN) = ippBigNumPOS;
        BN_SIZE(pBN) = 1;     /* initial valie is zero */
        BN_ROOM(pBN) = len;   /* close to what has been passed by user */

                              /* reserve one BNU_CHUNK_T more for cpDiv_BNU,
                              mul, mont exp operations */
        len++;

        /* allocate buffers */
        BN_NUMBER(pBN) = (BNU_CHUNK_T*)(ptr += sizeof(IppsBigNumState));
        BN_BUFFER(pBN) = (BNU_CHUNK_T*)(ptr += len * sizeof(BNU_CHUNK_T)); /* use expanded length here */

                                                                           /* set BN value and buffer to zero */
        ZEXPAND_BNU(BN_NUMBER(pBN), 0, len);
        ZEXPAND_BNU(BN_BUFFER(pBN), 0, len);

        BN_ID(pBN) = idCtxBigNum;
        return ippStsNoErr;
    }
}