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  /* 
  // 
  //  Purpose:
  //     Cryptography Primitive.
  //     RSA Functions
  // 
  //  Contents:
  //        ippsRSA_Encrypt()
  //
  */
  
  #include "owncp.h"
  #include "pcpbn.h"
  #include "pcpngrsa.h"
  #include "pcpngrsamethod.h"
  
  /*F*
  // Name: ippsRSA_Encrypt
  //
  // Purpose: Performs RSA Encryprion
  //
  // Returns:                   Reason:
  //    ippStsNullPtrErr           NULL == pKey
  //                               NULL == pPtxt
  //                               NULL == pCtxt
  //                               NULL == pBuffer
  //
  //    ippStsContextMatchErr     !RSA_PUB_KEY_VALID_ID()
  //                              !BN_VALID_ID(pPtxt)
  //                              !BN_VALID_ID(pCtxt)
  //
  //    ippStsIncompleteContextErr public key is not setup
  //
  //    ippStsOutOfRangeErr        pPtxt >= modulus
  //                               pPtxt <0
  //
  //    ippStsSizeErr              BN_ROOM(pCtxt) is not enough
  //
  //    ippStsNoErr                no error
  //
  // Parameters:
  //    pPtxt          pointer to the plaintext
  //    pCtxt          pointer to the ciphertext
  //    pKey           pointer to the key context
  //    pScratchBuffer pointer to the temporary buffer
  *F*/
  IPPFUN(IppStatus, ippsRSA_Encrypt,(const IppsBigNumState* pPtxt,
                                           IppsBigNumState* pCtxt,
                                     const IppsRSAPublicKeyState* pKey,
                                           Ipp8u* pBuffer))
  {
     IPP_BAD_PTR2_RET(pKey, pBuffer);
     pKey = (IppsRSAPublicKeyState*)( IPP_ALIGNED_PTR(pKey, RSA_PUBLIC_KEY_ALIGNMENT) );
     IPP_BADARG_RET(!RSA_PUB_KEY_VALID_ID(pKey), ippStsContextMatchErr);
     IPP_BADARG_RET(!RSA_PUB_KEY_IS_SET(pKey), ippStsIncompleteContextErr);
  
     IPP_BAD_PTR1_RET(pPtxt);
     pPtxt = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPtxt, BN_ALIGNMENT) );
     IPP_BADARG_RET(!BN_VALID_ID(pPtxt), ippStsContextMatchErr);
     IPP_BADARG_RET(BN_NEGATIVE(pPtxt), ippStsOutOfRangeErr);
     IPP_BADARG_RET(0 <= cpCmp_BNU(BN_NUMBER(pPtxt), BN_SIZE(pPtxt),
                                   MOD_MODULUS(RSA_PUB_KEY_NMONT(pKey)), MOD_LEN(RSA_PUB_KEY_NMONT(pKey))), ippStsOutOfRangeErr);
  
     IPP_BAD_PTR1_RET(pCtxt);
     pCtxt = (IppsBigNumState*)( IPP_ALIGNED_PTR(pCtxt, BN_ALIGNMENT) );
     IPP_BADARG_RET(!BN_VALID_ID(pCtxt), ippStsContextMatchErr);
     IPP_BADARG_RET(BN_ROOM(pCtxt) < BITS_BNU_CHUNK(RSA_PUB_KEY_BITSIZE_N(pKey)), ippStsSizeErr);
  
     {
        BNU_CHUNK_T* pScratchBuffer = (BNU_CHUNK_T*)(IPP_ALIGNED_PTR(pBuffer, (int)sizeof(BNU_CHUNK_T)) );
        gsRSApub_cipher(pCtxt, pPtxt, pKey, pScratchBuffer);
        return ippStsNoErr;
     }
  }
  