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You may * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ /* // // Purpose: // Cryptography Primitive. // Security Hash Standard // General Functionality // // Contents: // cpComputeDigest() // */ #include "owndefs.h" #include "owncp.h" #include "pcphash.h" #include "pcptool.h" void cpComputeDigest(Ipp8u* pHashTag, int hashTagLen, const IppsHashState* pCtx) { /* hash alg and parameters */ cpHashProc hashFunc = HASH_FUNC(pCtx); /* processing function */ const void* pParam = HASH_FUNC_PAR(pCtx); /* and it's addition params */ /* attributes */ const cpHashAttr* pAttr = &cpHashAlgAttr[HASH_ALG_ID(pCtx)]; int mbs = pAttr->msgBlkSize; /* data block size */ int ivSize = pAttr->ivSize; /* size of hash's IV */ int msgLenRepSize = pAttr->msgLenRepSize; /* length of the message representation */ /* number of bytes in context buffer */ int n = HAHS_BUFFIDX(pCtx); /* buffer and it actual length */ Ipp8u buffer[MBS_HASH_MAX*2]; int bufferLen = n < (mbs-msgLenRepSize)? mbs : mbs*2; /* copy current hash value */ cpHash hash; CopyBlock(HASH_VALUE(pCtx), hash, ivSize); /* copy of state's buffer */ CopyBlock(HASH_BUFF(pCtx), buffer, n); /* end of message bit */ buffer[n++] = 0x80; /* padd buffer */ PaddBlock(0, buffer+n, bufferLen-n-msgLenRepSize); /* message length representation in bits (remember about big endian) */ { /* convert processed message length bytes ->bits */ Ipp64u lo = HASH_LENLO(pCtx); Ipp64u hi = HASH_LENHI(pCtx); hi = LSL64(hi,3) | LSR64(lo,63-3); lo = LSL64(lo,3); if(msgLenRepSize>(int)(sizeof(Ipp64u))) { #if (IPP_ENDIAN == IPP_BIG_ENDIAN) ((Ipp64u*)(buffer+bufferLen))[-2] = hi; #else ((Ipp64u*)(buffer+bufferLen))[-2] = ENDIANNESS64(hi); #endif } /* recall about MD5 specific */ if(ippHashAlg_MD5!=HASH_ALG_ID(pCtx)) { #if (IPP_ENDIAN == IPP_BIG_ENDIAN) ((Ipp64u*)(buffer+bufferLen))[-1] = lo; #else ((Ipp64u*)(buffer+bufferLen))[-1] = ENDIANNESS64(lo); #endif } else { #if (IPP_ENDIAN == IPP_BIG_ENDIAN) ((Ipp64u*)(buffer+bufferLen))[-1] = ENDIANNESS64(lo); #else ((Ipp64u*)(buffer+bufferLen))[-1] = lo; #endif } } /* copmplete hash computation */ hashFunc(hash, buffer, bufferLen, pParam); /* store digest into the user buffer (remember digest in big endian) */ if(msgLenRepSize>(int)(sizeof(Ipp64u))) { /* ippHashAlg_SHA384, ippHashAlg_SHA512, ippHashAlg_SHA512_224 and ippHashAlg_SHA512_256 */ hash[0] = ENDIANNESS64(hash[0]); hash[1] = ENDIANNESS64(hash[1]); hash[2] = ENDIANNESS64(hash[2]); hash[3] = ENDIANNESS64(hash[3]); hash[4] = ENDIANNESS64(hash[4]); hash[5] = ENDIANNESS64(hash[5]); hash[6] = ENDIANNESS64(hash[6]); hash[7] = ENDIANNESS64(hash[7]); } else if(ippHashAlg_MD5!=HASH_ALG_ID(pCtx)) { ((Ipp32u*)hash)[0] = ENDIANNESS32(((Ipp32u*)hash)[0]); ((Ipp32u*)hash)[1] = ENDIANNESS32(((Ipp32u*)hash)[1]); ((Ipp32u*)hash)[2] = ENDIANNESS32(((Ipp32u*)hash)[2]); ((Ipp32u*)hash)[3] = ENDIANNESS32(((Ipp32u*)hash)[3]); ((Ipp32u*)hash)[4] = ENDIANNESS32(((Ipp32u*)hash)[4]); if(ippHashAlg_SHA1!=HASH_ALG_ID(pCtx)) { ((Ipp32u*)hash)[5] = ENDIANNESS32(((Ipp32u*)hash)[5]); ((Ipp32u*)hash)[6] = ENDIANNESS32(((Ipp32u*)hash)[6]); ((Ipp32u*)hash)[7] = ENDIANNESS32(((Ipp32u*)hash)[7]); } } CopyBlock(hash, pHashTag, hashTagLen); }