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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // SMS4 encryption/decryption
46 //
47 // Contents:
48 // cpProcessSMS4_ofb8()
49 //
50 */
51
52 #include "owncp.h"
53 #include "pcpsms4.h"
54 #include "pcptool.h"
55
56 #if !defined _PCP_SMS4_PROCESS_OFB8_H
57 #define _PCP_SMS4_PROCESS_OFB8_H
58
59 /*
60 // SMS4-OFB ecnryption/decryption
61 //
62 // Parameters:
63 // pSrc pointer to the source data buffer
64 // pDst pointer to the target data buffer
65 // dataLen input/output buffer length (in bytes)
66 // ofbBlkSize ofb block size (in bytes)
67 // pCtx pointer to the AES context
68 // pIV pointer to the initialization vector
69 */
cpProcessSMS4_ofb8(const Ipp8u * pSrc,Ipp8u * pDst,int dataLen,int ofbBlkSize,const IppsSMS4Spec * pCtx,Ipp8u * pIV)70 static void cpProcessSMS4_ofb8(const Ipp8u *pSrc, Ipp8u *pDst, int dataLen, int ofbBlkSize,
71 const IppsSMS4Spec* pCtx,
72 Ipp8u* pIV)
73 {
74 Ipp32u tmpInpOut[2*MBS_SMS4/sizeof(Ipp32u)];
75
76 CopyBlock16(pIV, tmpInpOut);
77
78 while(dataLen>=ofbBlkSize) {
79 /* block-by-block processing */
80 cpSMS4_Cipher((Ipp8u*)tmpInpOut+MBS_SMS4, (Ipp8u*)tmpInpOut, SMS4_RK(pCtx));
81
82 /* store output and shift inpBuffer for the next OFB operation */
83 if(ofbBlkSize==MBS_SMS4) {
84 ((Ipp32u*)pDst)[0] = tmpInpOut[0+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[0];
85 ((Ipp32u*)pDst)[1] = tmpInpOut[1+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[1];
86 ((Ipp32u*)pDst)[2] = tmpInpOut[2+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[2];
87 ((Ipp32u*)pDst)[3] = tmpInpOut[3+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[3];
88 tmpInpOut[0] = tmpInpOut[0+MBS_SMS4/sizeof(Ipp32u)];
89 tmpInpOut[1] = tmpInpOut[1+MBS_SMS4/sizeof(Ipp32u)];
90 tmpInpOut[2] = tmpInpOut[2+MBS_SMS4/sizeof(Ipp32u)];
91 tmpInpOut[3] = tmpInpOut[3+MBS_SMS4/sizeof(Ipp32u)];
92 }
93 else {
94 XorBlock(pSrc, tmpInpOut+MBS_SMS4/sizeof(Ipp32u), pDst, ofbBlkSize);
95 CopyBlock16((Ipp8u*)tmpInpOut+ofbBlkSize, tmpInpOut);
96 }
97
98 pSrc += ofbBlkSize;
99 pDst += ofbBlkSize;
100 dataLen -= ofbBlkSize;
101 }
102
103 /* update pIV */
104 CopyBlock16((Ipp8u*)tmpInpOut, pIV);
105 }
106
107 #endif /* #if !defined _PCP_SMS4_PROCESS_OFB8_H */
108