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/*
//
// Purpose:
// Cryptography Primitive.
// Security Hash Standard
// General Functionality
//
// Contents:
// ippsHashMessage()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcphash.h"
#include "pcphash_func.h"
#include "pcptool.h"
/*F*
// Name: ippsHashMessage
//
// Purpose: Hash of the whole message.
//
// Returns: Reason:
// ippStsNullPtrErr pMD == NULL
// pMsg == NULL but len!=0
// ippStsLengthErr len <0
// ippStsNotSupportedModeErr if hashAlg is not match to supported hash alg
// ippStsNoErr no errors
//
// Parameters:
// pMsg pointer to the input message
// len input message length
// pMD address of the output digest
// hashAlg hash alg ID
//
*F*/
IPPFUN(IppStatus, ippsHashMessage,(const Ipp8u* pMsg, int len, Ipp8u* pMD, IppHashAlgId hashAlg))
{
/* get algorithm id */
hashAlg = cpValidHashAlg(hashAlg);
/* test hash alg */
IPP_BADARG_RET(ippHashAlg_Unknown==hashAlg, ippStsNotSupportedModeErr);
/* test digest pointer */
IPP_BAD_PTR1_RET(pMD);
/* test message length */
IPP_BADARG_RET((len<0), ippStsLengthErr);
/* test message pointer */
IPP_BADARG_RET((len && !pMsg), ippStsNullPtrErr);
{
/* processing function and parameter */
cpHashProc hashFunc = cpHashProcFunc[hashAlg];
const void* pParam = cpHashProcFuncOpt[hashAlg];
/* attributes */
const cpHashAttr* pAttr = &cpHashAlgAttr[hashAlg];
int mbs = pAttr->msgBlkSize; /* data block size */
int ivSize = pAttr->ivSize; /* size of hash's IV */
int hashSize = pAttr->hashSize; /* hash size */
int msgLenRepSize = pAttr->msgLenRepSize; /* length of the message representation */
/* message bitlength representation */
Ipp64u msgLenBits = (Ipp64u)len*8;
/* length of main message part */
int msgLenBlks = len & (-mbs);
/* rest of message length */
int msgLenRest = len - msgLenBlks;
/* end of message buffer */
Ipp8u buffer[MBS_HASH_MAX*2];
int bufferLen = (msgLenRest < (mbs-msgLenRepSize))? mbs : mbs*2;
/* init hash */
cpHash hash;
const Ipp8u* iv = cpHashIV[hashAlg];
CopyBlock(iv, hash, ivSize);
/*construct last messge block(s) */
#define MSG_LEN_REP (sizeof(Ipp64u))
/* copy end of message */
CopyBlock(pMsg+len-msgLenRest, buffer, msgLenRest);
/* end of message bit */
buffer[msgLenRest++] = 0x80;
/* padd buffer */
PaddBlock(0, buffer+msgLenRest, bufferLen-msgLenRest-MSG_LEN_REP);
/* copy message bitlength representation */
if(ippHashAlg_MD5!=hashAlg)
msgLenBits = ENDIANNESS64(msgLenBits);
((Ipp64u*)(buffer+bufferLen))[-1] = msgLenBits;
#undef MSG_LEN_REP
/* message processing */
if(msgLenBlks)
hashFunc(hash, pMsg, msgLenBlks, pParam);
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!=hashAlg) {
/* ippHashAlg_SHA1, ippHashAlg_SHA224, ippHashAlg_SHA256 and ippHashAlg_SM3 */
((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]);
((Ipp32u*)hash)[5] = ENDIANNESS32(((Ipp32u*)hash)[5]);
((Ipp32u*)hash)[6] = ENDIANNESS32(((Ipp32u*)hash)[6]);
((Ipp32u*)hash)[7] = ENDIANNESS32(((Ipp32u*)hash)[7]);
}
CopyBlock(hash, pMD, hashSize);
return ippStsNoErr;
}
}