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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // Security Hash Standard
46 // General Functionality
47 //
48 // Contents:
49 // cpComputeDigest()
50 //
51 */
52
53 #include "owndefs.h"
54 #include "owncp.h"
55 #include "pcphash.h"
56 #include "pcptool.h"
57
58
cpComputeDigest(Ipp8u * pHashTag,int hashTagLen,const IppsHashState * pCtx)59 void cpComputeDigest(Ipp8u* pHashTag, int hashTagLen, const IppsHashState* pCtx)
60 {
61 /* hash alg and parameters */
62 cpHashProc hashFunc = HASH_FUNC(pCtx); /* processing function */
63 const void* pParam = HASH_FUNC_PAR(pCtx); /* and it's addition params */
64
65 /* attributes */
66 const cpHashAttr* pAttr = &cpHashAlgAttr[HASH_ALG_ID(pCtx)];
67 int mbs = pAttr->msgBlkSize; /* data block size */
68 int ivSize = pAttr->ivSize; /* size of hash's IV */
69 int msgLenRepSize = pAttr->msgLenRepSize; /* length of the message representation */
70
71 /* number of bytes in context buffer */
72 int n = HAHS_BUFFIDX(pCtx);
73 /* buffer and it actual length */
74 Ipp8u buffer[MBS_HASH_MAX*2];
75 int bufferLen = n < (mbs-msgLenRepSize)? mbs : mbs*2;
76
77 /* copy current hash value */
78 cpHash hash;
79 CopyBlock(HASH_VALUE(pCtx), hash, ivSize);
80
81 /* copy of state's buffer */
82 CopyBlock(HASH_BUFF(pCtx), buffer, n);
83 /* end of message bit */
84 buffer[n++] = 0x80;
85 /* padd buffer */
86 PaddBlock(0, buffer+n, bufferLen-n-msgLenRepSize);
87
88 /* message length representation in bits (remember about big endian) */
89 {
90 /* convert processed message length bytes ->bits */
91 Ipp64u lo = HASH_LENLO(pCtx);
92 Ipp64u hi = HASH_LENHI(pCtx);
93 hi = LSL64(hi,3) | LSR64(lo,63-3);
94 lo = LSL64(lo,3);
95
96 if(msgLenRepSize>(int)(sizeof(Ipp64u))) {
97 #if (IPP_ENDIAN == IPP_BIG_ENDIAN)
98 ((Ipp64u*)(buffer+bufferLen))[-2] = hi;
99 #else
100 ((Ipp64u*)(buffer+bufferLen))[-2] = ENDIANNESS64(hi);
101 #endif
102 }
103
104 /* recall about MD5 specific */
105 if(ippHashAlg_MD5!=HASH_ALG_ID(pCtx)) {
106 #if (IPP_ENDIAN == IPP_BIG_ENDIAN)
107 ((Ipp64u*)(buffer+bufferLen))[-1] = lo;
108 #else
109 ((Ipp64u*)(buffer+bufferLen))[-1] = ENDIANNESS64(lo);
110 #endif
111 }
112 else {
113 #if (IPP_ENDIAN == IPP_BIG_ENDIAN)
114 ((Ipp64u*)(buffer+bufferLen))[-1] = ENDIANNESS64(lo);
115 #else
116 ((Ipp64u*)(buffer+bufferLen))[-1] = lo;
117 #endif
118 }
119 }
120
121 /* copmplete hash computation */
122 hashFunc(hash, buffer, bufferLen, pParam);
123
124 /* store digest into the user buffer (remember digest in big endian) */
125 if(msgLenRepSize>(int)(sizeof(Ipp64u))) {
126 /* ippHashAlg_SHA384, ippHashAlg_SHA512, ippHashAlg_SHA512_224 and ippHashAlg_SHA512_256 */
127 hash[0] = ENDIANNESS64(hash[0]);
128 hash[1] = ENDIANNESS64(hash[1]);
129 hash[2] = ENDIANNESS64(hash[2]);
130 hash[3] = ENDIANNESS64(hash[3]);
131 hash[4] = ENDIANNESS64(hash[4]);
132 hash[5] = ENDIANNESS64(hash[5]);
133 hash[6] = ENDIANNESS64(hash[6]);
134 hash[7] = ENDIANNESS64(hash[7]);
135 }
136 else if(ippHashAlg_MD5!=HASH_ALG_ID(pCtx)) {
137 ((Ipp32u*)hash)[0] = ENDIANNESS32(((Ipp32u*)hash)[0]);
138 ((Ipp32u*)hash)[1] = ENDIANNESS32(((Ipp32u*)hash)[1]);
139 ((Ipp32u*)hash)[2] = ENDIANNESS32(((Ipp32u*)hash)[2]);
140 ((Ipp32u*)hash)[3] = ENDIANNESS32(((Ipp32u*)hash)[3]);
141 ((Ipp32u*)hash)[4] = ENDIANNESS32(((Ipp32u*)hash)[4]);
142 if(ippHashAlg_SHA1!=HASH_ALG_ID(pCtx)) {
143 ((Ipp32u*)hash)[5] = ENDIANNESS32(((Ipp32u*)hash)[5]);
144 ((Ipp32u*)hash)[6] = ENDIANNESS32(((Ipp32u*)hash)[6]);
145 ((Ipp32u*)hash)[7] = ENDIANNESS32(((Ipp32u*)hash)[7]);
146 }
147 }
148 CopyBlock(hash, pHashTag, hashTagLen);
149 }
150