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     40 
     41 /*
     42 //               Intel(R) Integrated Performance Primitives
     43 //                   Cryptographic Primitives (ippcp)
     44 //
     45 //  Contents:
     46 //        ippsMontExp()
     47 //
     48 */
     49 
     50 #include "owndefs.h"
     51 #include "owncp.h"
     52 #include "pcpbn.h"
     53 #include "pcpmontgomery.h"
     54 #include "pcptool.h"
     55 
     56 /*F*
     57 // Name: ippsMontExp
     58 //
     59 // Purpose: computes the Montgomery exponentiation with exponent
     60 //          IppsBigNumState *pE to the given big number integer of Montgomery form
     61 //          IppsBigNumState *pA with respect to the modulus IppsMontState *pCtx.
     62 //
     63 // Returns:                Reason:
     64 //      ippStsNoErr         Returns no error.
     65 //      ippStsNullPtrErr    Returns an error when pointers are null.
     66 //      ippStsBadArgErr     Returns an error when a or b is a negative integer.
     67 //      ippStsScaleRangeErr Returns an error when a or b is more than m.
     68 //      ippStsOutOfRangeErr Returns an error when IppsBigNumState *r is larger than
     69 //                          IppsMontState *m.
     70 //      ippStsContextMatchErr Returns an error when the context parameter does
     71 //                          not match the operation.
     72 //
     73 //
     74 // Parameters:
     75 //      pA      big number integer of Montgomery form within the
     76 //                      range [0,m-1]
     77 //      pE      big number exponent
     78 //      pCtx    Montgomery modulus of IppsMontState
     79 /       pR      the Montgomery exponentation result.
     80 //
     81 // Notes: IppsBigNumState *r should possess enough memory space as to hold the result
     82 //        of the operation. i.e. both pointers r->d and r->buffer should possess
     83 //        no less than (m->n->length) number of 32-bit words.
     84 *F*/
     85 
     86 IPPFUN(IppStatus, ippsMontExp, (const IppsBigNumState* pA, const IppsBigNumState* pE, IppsMontState* pCtx, IppsBigNumState* pR))
     87 {
     88    IPP_BAD_PTR4_RET(pA, pE, pCtx, pR);
     89 
     90    pCtx = (IppsMontState*)(IPP_ALIGNED_PTR((pCtx), MONT_ALIGNMENT));
     91    pA = (IppsBigNumState*)( IPP_ALIGNED_PTR(pA, BN_ALIGNMENT) );
     92    pE = (IppsBigNumState*)( IPP_ALIGNED_PTR(pE, BN_ALIGNMENT) );
     93    pR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pR, BN_ALIGNMENT) );
     94 
     95    IPP_BADARG_RET(!MNT_VALID_ID(pCtx), ippStsContextMatchErr);
     96    IPP_BADARG_RET(!BN_VALID_ID(pA), ippStsContextMatchErr);
     97    IPP_BADARG_RET(!BN_VALID_ID(pE), ippStsContextMatchErr);
     98    IPP_BADARG_RET(!BN_VALID_ID(pR), ippStsContextMatchErr);
     99 
    100    IPP_BADARG_RET(BN_ROOM(pR) <  MOD_LEN( MNT_ENGINE(pCtx) ), ippStsOutOfRangeErr);
    101    /* check a */
    102    IPP_BADARG_RET(BN_NEGATIVE(pA), ippStsBadArgErr);
    103    IPP_BADARG_RET(cpCmp_BNU(BN_NUMBER(pA), BN_SIZE(pA), MOD_MODULUS( MNT_ENGINE(pCtx) ), MOD_LEN( MNT_ENGINE(pCtx) )) >= 0, ippStsScaleRangeErr);
    104    /* check e */
    105    IPP_BADARG_RET(BN_NEGATIVE(pE), ippStsBadArgErr);
    106 
    107    cpMontExpBin_BN(pR, pA, pE, MNT_ENGINE( pCtx) );
    108 
    109    return ippStsNoErr;
    110 }
    111