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  /* 
  // 
  //  Purpose:
  //     Cryptography Primitive.
  //     RSA Functions
  // 
  //  Contents:
  //        ippsRSA_InitPrivateKeyType2()
  //
  */
  
  #include "owncp.h"
  #include "pcpbn.h"
  #include "pcpngrsa.h"
  
  #include "pcprsa_sizeof_privkey2.h"
  
  /*F*
  // Name: ippsRSA_InitPrivateKeyType2
  //
  // Purpose: Init RSA private key context
  //
  // Returns:                   Reason:
  //    ippStsNullPtrErr           NULL == pKey
  //
  //    ippStsNotSupportedModeErr  MIN_RSA_SIZE > (factorPbitSize+factorQbitSize)
  //                               MAX_RSA_SIZE < (factorPbitSize+factorQbitSize)
  //
  //    ippStsBadArgErr            0 >= factorPbitSize
  //                               0 >= factorQbitSize
  //                               factorQbitSize > factorPbitSize
  //
  //    ippStsMemAllocErr          keyCtxSize is not enough for operation
  //
  //    ippStsNoErr                no error
  //
  // Parameters:
  //    factorPbitSize       bitsize of RSA modulus (bitsize of P)
  //    factorQbitSize       bitsize of private exponent (bitsize of Q)
  //    pKey                 pointer to the key context
  //    keyCtxSize           size of memmory accosizted with key comtext
  *F*/
  
  IPPFUN(IppStatus, ippsRSA_InitPrivateKeyType2,(int factorPbitSize, int factorQbitSize,
                                                 IppsRSAPrivateKeyState* pKey, int keyCtxSize))
  {
     IPP_BAD_PTR1_RET(pKey);
     IPP_BADARG_RET((factorPbitSize<=0) || (factorQbitSize<=0), ippStsBadArgErr);
     IPP_BADARG_RET((factorPbitSize < factorQbitSize), ippStsBadArgErr);
     IPP_BADARG_RET((MIN_RSA_SIZE>(factorPbitSize+factorQbitSize) || (factorPbitSize+factorQbitSize)>MAX_RSA_SIZE), ippStsNotSupportedModeErr);
  
     /* test available size of context buffer */
     IPP_BADARG_RET(keyCtxSize<cpSizeof_RSA_privateKey2(factorPbitSize,factorQbitSize), ippStsMemAllocErr);
  
     pKey = (IppsRSAPrivateKeyState*)( IPP_ALIGNED_PTR(pKey, RSA_PRIVATE_KEY_ALIGNMENT) );
  
     RSA_PRV_KEY_ID(pKey) = idCtxRSA_PrvKey2;
     RSA_PRV_KEY_MAXSIZE_N(pKey) = 0;
     RSA_PRV_KEY_MAXSIZE_D(pKey) = 0;
     RSA_PRV_KEY_BITSIZE_N(pKey) = 0;
     RSA_PRV_KEY_BITSIZE_D(pKey) = 0;
     RSA_PRV_KEY_BITSIZE_P(pKey) = factorPbitSize;
     RSA_PRV_KEY_BITSIZE_Q(pKey) = factorQbitSize;
  
     RSA_PRV_KEY_D(pKey) = NULL;
  
     {
        Ipp8u* ptr = (Ipp8u*)pKey;
  
        int factorPlen = BITS_BNU_CHUNK(factorPbitSize);
        int factorQlen = BITS_BNU_CHUNK(factorQbitSize);
        int factorPlen32 = BITS2WORD32_SIZE(factorPbitSize);
        int factorQlen32 = BITS2WORD32_SIZE(factorQbitSize);
        int rsaModulusLen32 = BITS2WORD32_SIZE(factorPbitSize+factorQbitSize);
        int montPsize;
        int montQsize;
        int montNsize;
        rsaMontExpGetSize(factorPlen32, &montPsize);
        rsaMontExpGetSize(factorQlen32, &montQsize);
        rsaMontExpGetSize(rsaModulusLen32, &montNsize);
  
        /* allocate internal contexts */
        ptr += sizeof(IppsRSAPrivateKeyState);
  
        RSA_PRV_KEY_DP(pKey) = (BNU_CHUNK_T*)( IPP_ALIGNED_PTR((ptr), (int)sizeof(BNU_CHUNK_T)) );
        ptr += factorPlen*sizeof(BNU_CHUNK_T);
  
        RSA_PRV_KEY_DQ(pKey) = (BNU_CHUNK_T*)(ptr);
        ptr += factorQlen*sizeof(BNU_CHUNK_T);
  
        RSA_PRV_KEY_INVQ(pKey) = (BNU_CHUNK_T*)(ptr);
        ptr += factorPlen*sizeof(BNU_CHUNK_T);
  
        RSA_PRV_KEY_PMONT(pKey) = (gsModEngine*)( IPP_ALIGNED_PTR((ptr), (MONT_ALIGNMENT)) );
        ptr += montPsize;
  
        RSA_PRV_KEY_QMONT(pKey) = (gsModEngine*)( IPP_ALIGNED_PTR((ptr), (MONT_ALIGNMENT)) );
        ptr += montQsize;
  
        RSA_PRV_KEY_NMONT(pKey) = (gsModEngine*)( IPP_ALIGNED_PTR((ptr), (MONT_ALIGNMENT)) );
        ptr += montNsize;
  
        ZEXPAND_BNU(RSA_PRV_KEY_DP(pKey), 0, factorPlen);
        ZEXPAND_BNU(RSA_PRV_KEY_DQ(pKey), 0, factorQlen);
        ZEXPAND_BNU(RSA_PRV_KEY_INVQ(pKey), 0, factorPlen);
  
        gsModEngineInit(RSA_PRV_KEY_PMONT(pKey), 0, factorPbitSize, MOD_ENGINE_RSA_POOL_SIZE, gsModArithRSA());
        gsModEngineInit(RSA_PRV_KEY_QMONT(pKey), 0, factorQbitSize, MOD_ENGINE_RSA_POOL_SIZE, gsModArithRSA());
        gsModEngineInit(RSA_PRV_KEY_NMONT(pKey), 0, factorPbitSize+factorQbitSize, MOD_ENGINE_RSA_POOL_SIZE, gsModArithRSA());
  
        return ippStsNoErr;
     }
  }
  