1 /*******************************************************************************
2 * Copyright 2018 Intel Corporation
3 * All Rights Reserved.
4 *
5 * If this  software was obtained  under the  Intel Simplified  Software License,
6 * the following terms apply:
7 *
8 * The source code,  information  and material  ("Material") contained  herein is
9 * owned by Intel Corporation or its  suppliers or licensors,  and  title to such
10 * Material remains with Intel  Corporation or its  suppliers or  licensors.  The
11 * Material  contains  proprietary  information  of  Intel or  its suppliers  and
12 * licensors.  The Material is protected by  worldwide copyright  laws and treaty
13 * provisions.  No part  of  the  Material   may  be  used,  copied,  reproduced,
14 * modified, published,  uploaded, posted, transmitted,  distributed or disclosed
15 * in any way without Intel's prior express written permission.  No license under
16 * any patent,  copyright or other  intellectual property rights  in the Material
17 * is granted to  or  conferred  upon  you,  either   expressly,  by implication,
18 * inducement,  estoppel  or  otherwise.  Any  license   under such  intellectual
19 * property rights must be express and approved by Intel in writing.
20 *
21 * Unless otherwise agreed by Intel in writing,  you may not remove or alter this
22 * notice or  any  other  notice   embedded  in  Materials  by  Intel  or Intel's
23 * suppliers or licensors in any way.
24 *
25 *
26 * If this  software  was obtained  under the  Apache License,  Version  2.0 (the
27 * "License"), the following terms apply:
28 *
29 * You may  not use this  file except  in compliance  with  the License.  You may
30 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
31 *
32 *
33 * Unless  required  by   applicable  law  or  agreed  to  in  writing,  software
34 * distributed under the License  is distributed  on an  "AS IS"  BASIS,  WITHOUT
35 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
36 *
37 * See the   License  for the   specific  language   governing   permissions  and
38 * limitations under the License.
39 *******************************************************************************/
40 
41 /*
42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
43 //     Operations over GF(p).
44 //
45 //     Context:
46 //        ippsGFpGetElementOctString()
47 //
48 */
49 #include "owndefs.h"
50 #include "owncp.h"
51 
52 #include "pcpgfpstuff.h"
53 #include "pcpgfpxstuff.h"
54 #include "pcptool.h"
55 
56 
57 /*F*
58 // Name: ippsGFpGetElementOctString
59 //
60 // Purpose: Get GF Element to the octet string
61 //
62 // Returns:                   Reason:
63 //    ippStsNullPtrErr           NULL == pGFp
64 //                               NULL == pStr
65 //                               NULL == pA
66 //
67 //    ippStsContextMatchErr      invalid pGFp->idCtx
68 //                               invalid pA->idCtx
69 //                               invalid pR->idCtx
70 //
71 //    ippStsOutOfRangeErr        GFPE_ROOM() != GFP_FELEN()
72 //
73 //    ippStsSizeErr              !(0<lenA && lenA>=GFP_FELEN32(pGFE))
74 //
75 //    ippStsNoErr                no error
76 //
77 // Parameters:
78 //    pA       Pointer to the context of the finite field element.
79 //    pStr     Pointer to the octet string.
80 //    strSize  Size of the octet string buffer in bytes.
81 //    pGFp     Pointer to the context of the finite field.
82 //
83 *F*/
84 
85 IPPFUN(IppStatus, ippsGFpGetElementOctString,(const IppsGFpElement* pA, Ipp8u* pStr, int strSize, IppsGFpState* pGFp))
86 {
87    IPP_BAD_PTR3_RET(pStr, pA, pGFp);
88    pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
89    IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr );
90    IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
91    IPP_BADARG_RET( 0>=strSize, ippStsSizeErr );
92    {
93       gsModEngine* pGFE = GFP_PMA(pGFp);
94       IPP_BADARG_RET( GFPE_ROOM(pA)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
95       {
96          gsModEngine* pBasicGFE = cpGFpBasic(pGFE);
97          int basicDeg = cpGFpBasicDegreeExtension(pGFE);
98          int basicElemLen = GFP_FELEN(pBasicGFE);
99          int basicSize = BITS2WORD8_SIZE(BITSIZE_BNU(GFP_MODULUS(pBasicGFE),GFP_FELEN(pBasicGFE)));
100 
101          BNU_CHUNK_T* pDataElm = GFPE_DATA(pA);
102          int deg, error;
103          for(deg=0, error=0; deg<basicDeg && !error; deg++) {
104             int size = IPP_MIN(strSize, basicSize);
105             error = (NULL == cpGFpGetOctString(pStr, size, pDataElm, pBasicGFE));
106 
107             pDataElm += basicElemLen;
108             pStr += size;
109             strSize -= size;
110          }
111 
112          return error ? ippStsSizeErr : ippStsNoErr;
113       }
114    }
115 }
116