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40
41 /*
42 //
43 // Purpose:
44 // ES encryption/decryption API
45 //
46 //
47 */
48
49 #if !defined(_CP_GFP_ES_SM2_H)
50 #define _CP_GFP_ES_SM2_H
51
52 #include "owncp.h"
53
54 typedef enum {
55 ECESAlgoInit,
56 ECESAlgoKeySet,
57 ECESAlgoProcessing,
58 ECESAlgoFinished
59 } ECESAlgoState;
60
61 struct _cpStateECES_SM2 {
62 IppCtxId idCtx;
63 Ipp8u* pSharedSecret;
64 Ipp32s sharedSecretLen;
65
66 ECESAlgoState state;
67
68 Ipp32u kdfCounter;
69 Ipp8u pKdfWindow[IPP_SM3_DIGEST_BITSIZE / BYTESIZE];
70 Ipp8u wasNonZero;
71 Ipp8u kdfIndex;
72
73 IppsHashState_rmf* pKdfHasher;
74 IppsHashState_rmf* pTagHasher;
75 };
76
77 /* get a byte, update 0-kdf status */
cpECES_SM2KdfNextByte(IppsECESState_SM2 * pState)78 __INLINE Ipp8u cpECES_SM2KdfNextByte(IppsECESState_SM2* pState) {
79 if (pState->kdfIndex == IPP_SM3_DIGEST_BITSIZE / BYTESIZE) {
80 ++pState->kdfCounter;
81 pState->kdfIndex = 0;
82
83 {
84 Ipp8u ctnStr[sizeof(Ipp32u)];
85 ippsHashUpdate_rmf(pState->pSharedSecret, pState->sharedSecretLen, pState->pKdfHasher);
86 U32_TO_HSTRING(ctnStr, pState->kdfCounter);
87 ippsHashUpdate_rmf(ctnStr, sizeof(Ipp32u), pState->pKdfHasher);
88 ippsHashFinal_rmf(pState->pKdfWindow, pState->pKdfHasher);
89 }
90 }
91
92 pState->wasNonZero |= pState->pKdfWindow[pState->kdfIndex];
93
94 return pState->pKdfWindow[pState->kdfIndex++];
95 }
96
97 #endif