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40 
41 /*
42 //
43 //  Purpose:
44 //     Cryptography Primitive.
45 //     Digesting message according to SHA256
46 //
47 //  Contents:
48 //        ippsSHA256Update()
49 //
50 */
51 
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcphash.h"
55 #include "pcphash_rmf.h"
56 #include "pcptool.h"
57 #include "pcpsha256stuff.h"
58 
59 /*F*
60 //    Name: ippsSHA256Update
61 //
62 // Purpose: Updates intermadiate digest based on input stream.
63 //
64 // Returns:                Reason:
65 //    ippStsNullPtrErr        pSrc == NULL
66 //                            pState == NULL
67 //    ippStsContextMatchErr   pState->idCtx != idCtxSHA256
68 //    ippStsLengthErr         len <0
69 //    ippStsNoErr             no errors
70 //
71 // Parameters:
72 //    pSrc        pointer to the input stream
73 //    len         input stream length
74 //    pState      pointer to the SHA256 state
75 //
76 *F*/
77 IPPFUN(IppStatus, ippsSHA256Update,(const Ipp8u* pSrc, int len, IppsSHA256State* pState))
78 {
79    /* test state pointer and ID */
80    IPP_BAD_PTR1_RET(pState);
81    pState = (IppsSHA256State*)( IPP_ALIGNED_PTR(pState, SHA256_ALIGNMENT) );
82    IPP_BADARG_RET(idCtxSHA256 !=HASH_CTX_ID(pState), ippStsContextMatchErr);
83 
84    /* test input length */
85    IPP_BADARG_RET((len<0), ippStsLengthErr);
86    /* test source pointer */
87    IPP_BADARG_RET((len && !pSrc), ippStsNullPtrErr);
88 
89    /*
90    // handle non empty message
91    */
92    if(len) {
93       /* select processing function */
94       #if (_SHA_NI_ENABLING_==_FEATURE_ON_)
95       cpHashProc updateFunc = UpdateSHA256ni;
96       #elif (_SHA_NI_ENABLING_==_FEATURE_TICKTOCK_)
97       cpHashProc updateFunc = IsFeatureEnabled(ippCPUID_SHA)? UpdateSHA256ni : UpdateSHA256;
98       #else
99       cpHashProc updateFunc = UpdateSHA256;
100       #endif
101 
102       int procLen;
103 
104       int idx = HAHS_BUFFIDX(pState);
105       Ipp8u* pBuffer = HASH_BUFF(pState);
106       Ipp64u lenLo = HASH_LENLO(pState) +len;
107 
108       /* if non empty internal buffer filling */
109       if(idx) {
110          /* copy from input stream to the internal buffer as match as possible */
111          procLen = IPP_MIN(len, (MBS_SHA256-idx));
112          CopyBlock(pSrc, pBuffer+idx, procLen);
113 
114          /* update message pointer and length */
115          pSrc += procLen;
116          len  -= procLen;
117          idx  += procLen;
118 
119          /* update digest if buffer full */
120          if( MBS_SHA256 == idx) {
121             updateFunc(HASH_VALUE(pState), pBuffer, MBS_SHA256, sha256_cnt);
122             idx = 0;
123          }
124       }
125 
126       /* main message part processing */
127       procLen = len & ~(MBS_SHA256-1);
128       if(procLen) {
129          updateFunc(HASH_VALUE(pState), pSrc, procLen, sha256_cnt);
130          pSrc += procLen;
131          len  -= procLen;
132       }
133 
134       /* store rest of message into the internal buffer */
135       if(len) {
136          CopyBlock(pSrc, pBuffer, len);
137          idx += len;
138       }
139 
140       /* update length of processed message */
141       HASH_LENLO(pState) = lenLo;
142       HAHS_BUFFIDX(pState) = idx;
143    }
144 
145    return ippStsNoErr;
146 }
147