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dkcSHA1.c

説明を見る。
00001 
00009 #include "dkcSHA1.h"
00010 #include "dkcStdio.h"
00011 
00012 
00013 #define SHA_BUFFER_SIZE (SHA_BLOCK * 4)
00014 
00015 
00016 const static DWORD c_dwInitH0 = 0x67452301;
00017 const static DWORD c_dwInitH1 = 0xefcdab89;
00018 const static DWORD c_dwInitH2 = 0x98badcfe;
00019 const static DWORD c_dwInitH3 = 0x10325476;
00020 const static DWORD c_dwInitH4 = 0xc3d2e1f0;
00021 
00022 const static DWORD c_dwK_00_19 = 0x5a827999;
00023 const static DWORD c_dwK_20_39 = 0x6ed9eba1;
00024 const static DWORD c_dwK_40_59 = 0x8f1bbcdc;
00025 const static DWORD c_dwK_60_79 = 0xca62c1d6;
00026 
00027 static DKC_INLINE DWORD ReverseEndian(DWORD dwValue)
00028 {
00029     //return (dwValue << 24) | ((dwValue & 0x0000ff00) << 8) | ((dwValue & 0x00ff0000) >> 8) | (dwValue >> 24);
00030     return dkcReverseEndian32(dwValue);
00031 }
00032 
00033 static DKC_INLINE DWORD Rotate(DWORD dwValue, DWORD dwNum)
00034 {
00035     return (dwValue << dwNum) | (dwValue >> (32 - dwNum));
00036 }
00037 
00038 
00039 static DKC_INLINE Generate(DKC_SHA1 *p)
00040 {
00041     int i;
00042     DWORD Work[SHA_WORK];
00043     DWORD Hash[SHA_WORK + SHA_HASH];
00044     DWORD *pHash;
00045 
00046     for(i = 0; i < SHA_BLOCK; i++) Work[i] = ReverseEndian(p->m_aBlock[i]);
00047     for(i = SHA_BLOCK; i < SHA_WORK; i++){
00048         Work[i] = Rotate(Work[i - 3] ^ Work[i - 8] ^ Work[i - 14] ^ Work[i - 16], 1);
00049     }
00050 
00051     for(i = 0; i < 5; i++) Hash[SHA_WORK + i] = p->m_dwH[i];
00052     pHash = &Hash[SHA_WORK];
00053 
00054     for(i = 0; i < 20; i++){
00055         pHash--;
00056         pHash[0] = (pHash[2] & (pHash[3] ^ pHash[4])) ^ pHash[4];
00057         pHash[0] += Rotate(pHash[1], 5) + pHash[5] + Work[i] + c_dwK_00_19;
00058         pHash[2] = Rotate(pHash[2], 30);
00059     }
00060     for(i = 20; i < 40; i++){
00061         pHash--;
00062         pHash[0] = pHash[2] ^ pHash[3] ^ pHash[4];
00063         pHash[0] += Rotate(pHash[1], 5) + pHash[5] + Work[i] + c_dwK_20_39;
00064         pHash[2] = Rotate(pHash[2], 30);
00065     }
00066     for(i = 40; i < 60; i++){
00067         pHash--;
00068         pHash[0] = (pHash[2] & (pHash[3] | pHash[4])) | (pHash[3] & pHash[4]);
00069         pHash[0] += Rotate(pHash[1], 5) + pHash[5] + Work[i] + c_dwK_40_59;
00070         pHash[2] = Rotate(pHash[2], 30);
00071     }
00072     for(i = 60; i < 80; i++){
00073         pHash--;
00074         pHash[0] = pHash[2] ^ pHash[3] ^ pHash[4];
00075         pHash[0] += Rotate(pHash[1], 5) + pHash[5] + Work[i] + c_dwK_60_79;
00076         pHash[2] = Rotate(pHash[2], 30);
00077     }
00078 
00079     for(i = 0; i < 5; i++) p->m_dwH[i] += pHash[i];
00080 }
00081 
00082 DKC_SHA1 *WINAPI dkcAllocSHA1(){
00083     DKC_SHA1 *p = dkcAllocate(sizeof(DKC_SHA1));
00084     if(NULL==p){
00085         return NULL;
00086     }
00087     dkcSHA1Init(p);
00088     return p;
00089 }
00090 
00091 void WINAPI dkcSHA1Init(DKC_SHA1 *p){
00092     p->m_dwH[0] = c_dwInitH0;
00093     p->m_dwH[1] = c_dwInitH1;
00094     p->m_dwH[2] = c_dwInitH2;
00095     p->m_dwH[3] = c_dwInitH3;
00096     p->m_dwH[4] = c_dwInitH4;
00097     p->m_dwLNumBits = 0;
00098     p->m_dwHNumBits = 0;
00099     p->m_nNumChr = 0;
00100 
00101     p->mFinalized = FALSE;
00102 }
00103 
00104 void WINAPI dkcSHA1Load(DKC_SHA1 *p,const BYTE *pBuffer,DWORD dwSize){
00105     DWORD dwLNumBits;
00106     BYTE *pBlock;
00107     DWORD dwReadSize;
00108     
00109     if(dwSize == 0) return;
00110     if(p->mFinalized){
00111         return;
00112     }
00113 
00114     dwLNumBits = (p->m_dwLNumBits + (dwSize << 3));
00115     if(dwLNumBits < p->m_dwLNumBits) p->m_dwHNumBits++;
00116     p->m_dwHNumBits += dwSize >> 29;
00117     p->m_dwLNumBits = dwLNumBits;
00118 
00119     pBlock = (BYTE *)p->m_aBlock;
00120     while(dwSize){
00121         //dwReadSize = (dwSize < SHA_BUFFER_SIZE - p->m_nNumChr) ?
00122         dwReadSize = (dwSize < SHA_BUFFER_SIZE - (DWORD)p->m_nNumChr) ?
00123             dwSize :
00124             (SHA_BUFFER_SIZE - p->m_nNumChr);
00125 
00126         memcpy(pBlock + p->m_nNumChr, pBuffer, dwReadSize);
00127 
00128         p->m_nNumChr += dwReadSize;
00129         pBuffer += dwReadSize;
00130         dwSize -= dwReadSize;
00131 
00132         if(p->m_nNumChr == SHA_BUFFER_SIZE){
00133             Generate(p);
00134             p->m_nNumChr = 0;
00135         }
00136     }
00137 
00138 }
00139 
00140 void WINAPI dkcSHA1Final(DKC_SHA1 *p){
00141     BYTE cZero = 0x00;
00142     BYTE cOne  = 0x80;
00143     DWORD dwHNumBits;
00144     DWORD dwLNumBits;
00145     if(p->mFinalized){
00146         return ;
00147     }
00148 
00149     dwHNumBits = ReverseEndian(p->m_dwHNumBits);
00150     dwLNumBits = ReverseEndian(p->m_dwLNumBits);
00151 
00152     dkcSHA1Load(p,&cOne, 1);
00153     while(p->m_nNumChr != SHA_BUFFER_SIZE - 8) dkcSHA1Load(p,&cZero, 1);
00154 
00155     dkcSHA1Load(p,(BYTE *)&dwHNumBits, 4);
00156     dkcSHA1Load(p,(BYTE *)&dwLNumBits, 4);
00157     
00158     //ファイナル処理した。
00159     p->mFinalized = TRUE;
00160 
00161 }
00162 
00163 int WINAPI dkcSHA1DigestStr(DKC_SHA1 *p,char *buff,size_t size){
00164 
00165     //char s[SHA_HASH * 8 + 1];
00166     char s[SHA1_STR_BUFFER_SIZE];
00167     int i;
00168     //s[SHA_HASH * 8]='\0';
00169     s[SHA1_STR_BUFFER_SIZE]='\0';
00170 
00171     if(SHA1_STR_BUFFER_SIZE > size){
00172         return edk_BufferOverFlow;
00173     }
00174     if(FALSE==p->mFinalized){
00175         //まだFinalやってないっつーの
00176         return edk_LogicError;
00177     }
00178 
00179     for( i = 0; i < SHA_HASH; i++){
00180         sprintf(s + i * 8, "%08x", p->m_dwH[i]);
00181     }
00182     //std::string strDigest = s;
00183     //return strDigest;
00184     return dkc_strcpy(buff,size,s,strlen(s));
00185 }
00186 
00187 
00188 int WINAPI dkcSHA1FinalDigestStr(DKC_SHA1 *p,char *buff,size_t size){
00189     dkcSHA1Final(p);
00190     return dkcSHA1DigestStr(p,buff,size);
00191 }
00192 
00193 int WINAPI dkcSHA1Digest(DKC_SHA1 *p,BYTE *buff,size_t size){
00194     size_t i = 0;
00195     //DWORD *dwp = (DWORD *)buff;
00196     //char s[SHA1_STR_BUFFER_SIZE];
00197     //s[SHA1_STR_BUFFER_SIZE]='\0';
00198 
00199     if(SHA1_BIN_BUFFER_SIZE > size){
00200         return edk_BufferOverFlow;
00201     }
00202     if(FALSE==p->mFinalized){
00203         //まだFinalやってないっつーの
00204         return edk_LogicError;
00205     }
00206     /*
00207     for( i = 0; i < SHA_HASH; i++){
00208         sprintf(s + i * 8, "%08x", p->m_dwH[i]);
00209         dwp[i] = atoi(s + i * 8);
00210     }*/
00211     for(i = 0; i < SHA1_BIN_BUFFER_SIZE; ++i){
00212         buff[i] = (BYTE)(p->m_dwH[i >> 2] >> (8 * (~i & 3)));
00213     }
00214     return edk_SUCCEEDED;
00215     //ナにバカやってんだ私。
00216     //return dkc_memcpy(buff,size,(const void *)p->m_dwH,sizeof(p->m_dwH));
00217 }
00218 
00219 
00220 int WINAPI dkcSHA1FinalDigest(DKC_SHA1 *p,BYTE *buff,size_t size){
00221     dkcSHA1Final(p);
00222     return dkcSHA1Digest(p,buff,size);
00223 }
00224 
00225 int WINAPI dkcFreeSHA1(DKC_SHA1 **p){
00226     if(NULL==p){
00227         return edk_FAILED;
00228     }
00229     return dkcFree(p);
00230 }

dkutil_cに対してSun Jul 18 22:45:21 2004に生成されました。 doxygen 1.3.6