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  /*
  //
  //  Purpose:
  //     Cryptography Primitive.
  //     RC4 implementation
  //
  */
  
  #include "owndefs.h"
  #include "owncp.h"
  #include "pcparcfour.h"
  #include "pcptool.h"
  
  /*F*
  //    Name: ippsARCFourInit
  //
  // Purpose: Init ARCFOUR spec for future usage.
  //
  // Returns:                Reason:
  //    ippStsNullPtrErr        pCtx == NULL
  //    ippStsLengthErr         1 > keyLen
  //                            keyLen > IPP_ARCFOUR_KEYMAX_SIZE
  //    ippStsNoErr             no errors
  //
  // Parameters:
  //    key         security key
  //    keyLen      length of key (bytes)
  //    pCtx        pointer to the ARCFOUR context
  //
  *F*/
  IPPFUN(IppStatus, ippsARCFourInit, (const Ipp8u *pKey, int keyLen, IppsARCFourState *pCtx))
  {
     /* test context pointer */
     IPP_BAD_PTR1_RET(pCtx);
     /* use aligned context */
     pCtx = (IppsARCFourState*)( IPP_ALIGNED_PTR(pCtx, RC4_ALIGNMENT) );
  
     /* test key */
     IPP_BAD_PTR1_RET(pKey);
     IPP_BADARG_RET(((1>keyLen)||(IPP_ARCFOUR_KEYMAX_SIZE< keyLen)), ippStsLengthErr);
  
     {
        int i;
        Ipp8u kblk[256], j, tmp;
  
        /* init RC4 context */
        RC4_ID(pCtx) = idCtxARCFOUR;
  
        for(i=0; i<256; i++) {
           pCtx->Sbox0[i] = (Ipp8u)i;
           kblk[i] = pKey[i%keyLen];
        }
        j=0;
        for(i=0; i<256; i++) {
           j += pCtx->Sbox0[i] + kblk[i];
           tmp = pCtx->Sbox0[j];
           pCtx->Sbox0[j] = pCtx->Sbox0[i];
           pCtx->Sbox0[i] = tmp;
        }
  
        return ippsARCFourReset(pCtx);
     }
  }
  