- Generated by
1.7.5
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WizardsToolkit
1.0.7
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00001 /* 00002 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00003 % % 00004 % % 00005 % SSSSS H H AAA % 00006 % SS H H A A % 00007 % SSS HHHHH AAAAA % 00008 % SS H H A A % 00009 % SSSSS H H A A % 00010 % % 00011 % % 00012 % Wizard's Toolkit Secure Hash Algorithm-256 Methods % 00013 % % 00014 % Software Design % 00015 % John Cristy % 00016 % March 2003 % 00017 % % 00018 % % 00019 % Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization % 00020 % dedicated to making software imaging solutions freely available. % 00021 % % 00022 % You may not use this file except in compliance with the License. You may % 00023 % obtain a copy of the License at % 00024 % % 00025 % http://www.wizards-toolkit.org/script/license.php % 00026 % % 00027 % Unless required by applicable law or agreed to in writing, software % 00028 % distributed under the License is distributed on an "AS IS" BASIS, % 00029 % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % 00030 % See the License for the specific language governing permissions and % 00031 % limitations under the License. % 00032 % % 00033 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00034 % 00035 % See http://csrc.nist.gov/cryptval/shs.htm. 00036 % 00037 */ 00038 00039 /* 00040 Include declarations. 00041 */ 00042 #include "wizard/studio.h" 00043 #include "wizard/exception.h" 00044 #include "wizard/exception-private.h" 00045 #include "wizard/memory_.h" 00046 #include "wizard/sha256.h" 00047 /* 00048 Define declarations. 00049 */ 00050 #define SHA256Blocksize 64 00051 #define SHA256Digestsize 32 00052 00053 /* 00054 Typedef declarations. 00055 */ 00056 struct _SHA256Info 00057 { 00058 unsigned int 00059 digestsize, 00060 blocksize; 00061 00062 StringInfo 00063 *digest, 00064 *message; 00065 00066 unsigned int 00067 *accumulator, 00068 low_order, 00069 high_order; 00070 00071 size_t 00072 offset; 00073 00074 WizardBooleanType 00075 lsb_first; 00076 00077 time_t 00078 timestamp; 00079 00080 size_t 00081 signature; 00082 }; 00083 00084 /* 00085 Forward declarations. 00086 */ 00087 static void 00088 TransformSHA256(SHA256Info *); 00089 00090 /* 00091 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00092 % % 00093 % % 00094 % % 00095 % A c q u i r e S H A I n f o % 00096 % % 00097 % % 00098 % % 00099 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00100 % 00101 % AcquireSHA256Info() allocate the SHA256Info structure. 00102 % 00103 % The format of the AcquireSHA256Info method is: 00104 % 00105 % SHA256Info *AcquireSHA256Info(void) 00106 % 00107 */ 00108 WizardExport SHA256Info *AcquireSHA256Info(void) 00109 { 00110 SHA256Info 00111 *sha_info; 00112 00113 unsigned int 00114 lsb_first; 00115 00116 sha_info=(SHA256Info *) AcquireWizardMemory(sizeof(*sha_info)); 00117 if (sha_info == (SHA256Info *) NULL) 00118 ThrowWizardFatalError(HashError,MemoryError); 00119 (void) ResetWizardMemory(sha_info,0,sizeof(*sha_info)); 00120 sha_info->digestsize=SHA256Digestsize; 00121 sha_info->blocksize=SHA256Blocksize; 00122 sha_info->digest=AcquireStringInfo(SHA256Digestsize); 00123 sha_info->message=AcquireStringInfo(SHA256Blocksize); 00124 sha_info->accumulator=(unsigned int *) AcquireQuantumMemory(SHA256Blocksize, 00125 sizeof(*sha_info->accumulator)); 00126 if (sha_info->accumulator == (unsigned int *) NULL) 00127 ThrowWizardFatalError(HashError,MemoryError); 00128 lsb_first=1; 00129 sha_info->lsb_first=(int) (*(char *) &lsb_first) == 1 ? WizardTrue : 00130 WizardFalse; 00131 sha_info->timestamp=time((time_t *) NULL); 00132 sha_info->signature=WizardSignature; 00133 InitializeSHA256(sha_info); 00134 return(sha_info); 00135 } 00136 00137 /* 00138 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00139 % % 00140 % % 00141 % % 00142 % D e s t r o y S H A I n f o % 00143 % % 00144 % % 00145 % % 00146 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00147 % 00148 % DestroySHA256Info() zeros memory associated with the SHA256Info structure. 00149 % 00150 % The format of the DestroySHA256Info method is: 00151 % 00152 % SHA256Info *DestroySHA256Info(SHA256Info *sha_info) 00153 % 00154 % A description of each parameter follows: 00155 % 00156 % o sha_info: The cipher sha_info. 00157 % 00158 */ 00159 WizardExport SHA256Info *DestroySHA256Info(SHA256Info *sha_info) 00160 { 00161 (void) LogWizardEvent(TraceEvent,GetWizardModule(),"..."); 00162 assert(sha_info != (SHA256Info *) NULL); 00163 assert(sha_info->signature == WizardSignature); 00164 if (sha_info->accumulator != (unsigned int *) NULL) 00165 sha_info->accumulator=(unsigned int *) 00166 RelinquishWizardMemory(sha_info->accumulator); 00167 if (sha_info->message != (StringInfo *) NULL) 00168 sha_info->message=DestroyStringInfo(sha_info->message); 00169 if (sha_info->digest != (StringInfo *) NULL) 00170 sha_info->digest=DestroyStringInfo(sha_info->digest); 00171 sha_info->signature=(~WizardSignature); 00172 sha_info=(SHA256Info *) RelinquishWizardMemory(sha_info); 00173 return(sha_info); 00174 } 00175 00176 /* 00177 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00178 % % 00179 % % 00180 % % 00181 % F i n a l i z e S H A % 00182 % % 00183 % % 00184 % % 00185 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00186 % 00187 % FinalizeSHA256() finalizes the SHA256 message accumulator computation. 00188 % 00189 % The format of the FinalizeSHA256 method is: 00190 % 00191 % FinalizeSHA256(SHA256Info *sha_info) 00192 % 00193 % A description of each parameter follows: 00194 % 00195 % o sha_info: The address of a structure of type SHA256Info. 00196 % 00197 */ 00198 WizardExport void FinalizeSHA256(SHA256Info *sha_info) 00199 { 00200 register ssize_t 00201 i; 00202 00203 register unsigned char 00204 *q; 00205 00206 register unsigned int 00207 *p; 00208 00209 unsigned char 00210 *datum; 00211 00212 unsigned int 00213 count, 00214 high_order, 00215 low_order; 00216 00217 /* 00218 Add padding and return the message accumulator. 00219 */ 00220 (void) LogWizardEvent(TraceEvent,GetWizardModule(),"..."); 00221 assert(sha_info != (SHA256Info *) NULL); 00222 assert(sha_info->signature == WizardSignature); 00223 low_order=sha_info->low_order; 00224 high_order=sha_info->high_order; 00225 count=((low_order >> 3) & 0x3f); 00226 datum=GetStringInfoDatum(sha_info->message); 00227 datum[count++]=(unsigned char) 0x80; 00228 if (count <= (unsigned int) (GetStringInfoLength(sha_info->message)-8)) 00229 (void) ResetWizardMemory(datum+count,0,GetStringInfoLength( 00230 sha_info->message)-8-count); 00231 else 00232 { 00233 (void) ResetWizardMemory(datum+count,0, 00234 GetStringInfoLength(sha_info->message)-count); 00235 TransformSHA256(sha_info); 00236 (void) ResetWizardMemory(datum,0,GetStringInfoLength(sha_info->message)- 00237 8); 00238 } 00239 datum[56]=(unsigned char) (high_order >> 24); 00240 datum[57]=(unsigned char) (high_order >> 16); 00241 datum[58]=(unsigned char) (high_order >> 8); 00242 datum[59]=(unsigned char) high_order; 00243 datum[60]=(unsigned char) (low_order >> 24); 00244 datum[61]=(unsigned char) (low_order >> 16); 00245 datum[62]=(unsigned char) (low_order >> 8); 00246 datum[63]=(unsigned char) low_order; 00247 TransformSHA256(sha_info); 00248 p=sha_info->accumulator; 00249 q=GetStringInfoDatum(sha_info->digest); 00250 for (i=0; i < (SHA256Digestsize/4); i++) 00251 { 00252 *q++=(unsigned char) ((*p >> 24) & 0xff); 00253 *q++=(unsigned char) ((*p >> 16) & 0xff); 00254 *q++=(unsigned char) ((*p >> 8) & 0xff); 00255 *q++=(unsigned char) (*p & 0xff); 00256 p++; 00257 } 00258 /* 00259 Reset working registers. 00260 */ 00261 count=0; 00262 high_order=0; 00263 low_order=0; 00264 } 00265 00266 /* 00267 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00268 % % 00269 % % 00270 % % 00271 % G e t S H A 2 5 6 B l o c k s i z e % 00272 % % 00273 % % 00274 % % 00275 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00276 % 00277 % GetSHA256Blocksize() returns the SHA256 blocksize. 00278 % 00279 % The format of the GetSHA256Blocksize method is: 00280 % 00281 % unsigned int *GetSHA256Blocksize(const SHA256Info *sha256_info) 00282 % 00283 % A description of each parameter follows: 00284 % 00285 % o sha256_info: The sha256 info. 00286 % 00287 */ 00288 WizardExport unsigned int GetSHA256Blocksize(const SHA256Info *sha256_info) 00289 { 00290 (void) LogWizardEvent(TraceEvent,GetWizardModule(),"..."); 00291 WizardAssert(CipherDomain,sha256_info != (SHA256Info *) NULL); 00292 WizardAssert(CipherDomain,sha256_info->signature == WizardSignature); 00293 return(sha256_info->blocksize); 00294 } 00295 00296 /* 00297 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00298 % % 00299 % % 00300 % % 00301 % G e t S H A 2 5 6 D i g e s t % 00302 % % 00303 % % 00304 % % 00305 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00306 % 00307 % GetSHA256Digest() returns the SHA256 digest. 00308 % 00309 % The format of the GetSHA256Digest method is: 00310 % 00311 % const StringInfo *GetSHA256Digest(const SHA256Info *sha256_info) 00312 % 00313 % A description of each parameter follows: 00314 % 00315 % o sha256_info: The sha256 info. 00316 % 00317 */ 00318 WizardExport const StringInfo *GetSHA256Digest(const SHA256Info *sha256_info) 00319 { 00320 (void) LogWizardEvent(TraceEvent,GetWizardModule(),"..."); 00321 WizardAssert(HashDomain,sha256_info != (SHA256Info *) NULL); 00322 WizardAssert(HashDomain,sha256_info->signature == WizardSignature); 00323 return(sha256_info->digest); 00324 } 00325 00326 /* 00327 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00328 % % 00329 % % 00330 % % 00331 % G e t S H A 2 5 6 D i g e s t s i z e % 00332 % % 00333 % % 00334 % % 00335 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00336 % 00337 % GetSHA256Digestsize() returns the SHA256 digest size. 00338 % 00339 % The format of the GetSHA256Digestsize method is: 00340 % 00341 % unsigned int *GetSHA256Digestsize(const SHA256Info *sha256_info) 00342 % 00343 % A description of each parameter follows: 00344 % 00345 % o sha256_info: The sha256 info. 00346 % 00347 */ 00348 WizardExport unsigned int GetSHA256Digestsize(const SHA256Info *sha256_info) 00349 { 00350 (void) LogWizardEvent(TraceEvent,GetWizardModule(),"..."); 00351 WizardAssert(CipherDomain,sha256_info != (SHA256Info *) NULL); 00352 WizardAssert(CipherDomain,sha256_info->signature == WizardSignature); 00353 return(sha256_info->digestsize); 00354 } 00355 00356 /* 00357 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00358 % % 00359 % % 00360 % % 00361 % I n i t i a l i z e S H A % 00362 % % 00363 % % 00364 % % 00365 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00366 % 00367 % IntializeSHA256() intializes the SHA256 accumulator. 00368 % 00369 % The format of the DestroySHA256Info method is: 00370 % 00371 % void InitializeSHA256Info(SHA256Info *sha_info) 00372 % 00373 % A description of each parameter follows: 00374 % 00375 % o sha_info: The cipher sha_info. 00376 % 00377 */ 00378 WizardExport void InitializeSHA256(SHA256Info *sha_info) 00379 { 00380 (void) LogWizardEvent(TraceEvent,GetWizardModule(),"..."); 00381 assert(sha_info != (SHA256Info *) NULL); 00382 assert(sha_info->signature == WizardSignature); 00383 sha_info->accumulator[0]=0x6a09e667U; 00384 sha_info->accumulator[1]=0xbb67ae85U; 00385 sha_info->accumulator[2]=0x3c6ef372U; 00386 sha_info->accumulator[3]=0xa54ff53aU; 00387 sha_info->accumulator[4]=0x510e527fU; 00388 sha_info->accumulator[5]=0x9b05688cU; 00389 sha_info->accumulator[6]=0x1f83d9abU; 00390 sha_info->accumulator[7]=0x5be0cd19U; 00391 sha_info->low_order=0; 00392 sha_info->high_order=0; 00393 sha_info->offset=0; 00394 } 00395 00396 /* 00397 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00398 % % 00399 % % 00400 % % 00401 % T r a n s f o r m S H A % 00402 % % 00403 % % 00404 % % 00405 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00406 % 00407 % TransformSHA256() transforms the SHA256 message accumulator. 00408 % 00409 % The format of the TransformSHA256 method is: 00410 % 00411 % TransformSHA256(SHA256Info *sha_info) 00412 % 00413 % A description of each parameter follows: 00414 % 00415 % o sha_info: The address of a structure of type SHA256Info. 00416 % 00417 */ 00418 00419 static inline unsigned int Ch(unsigned int x,unsigned int y,unsigned int z) 00420 { 00421 return((x & y) ^ (~x & z)); 00422 } 00423 00424 static inline unsigned int Maj(unsigned int x,unsigned int y,unsigned int z) 00425 { 00426 return((x & y) ^ (x & z) ^ (y & z)); 00427 } 00428 00429 static inline unsigned int Trunc32(unsigned int x) 00430 { 00431 return((unsigned int) (x & 0xffffffffU)); 00432 } 00433 00434 static unsigned int RotateRight(unsigned int x,unsigned int n) 00435 { 00436 return(Trunc32((x >> n) | (x << (32-n)))); 00437 } 00438 00439 static void TransformSHA256(SHA256Info *sha_info) 00440 { 00441 #define Sigma0(x) (RotateRight(x,7) ^ RotateRight(x,18) ^ Trunc32((x) >> 3)) 00442 #define Sigma1(x) (RotateRight(x,17) ^ RotateRight(x,19) ^ Trunc32((x) >> 10)) 00443 #define Suma0(x) (RotateRight(x,2) ^ RotateRight(x,13) ^ RotateRight(x,22)) 00444 #define Suma1(x) (RotateRight(x,6) ^ RotateRight(x,11) ^ RotateRight(x,25)) 00445 00446 ssize_t 00447 j; 00448 00449 register ssize_t 00450 i; 00451 00452 register unsigned char 00453 *p; 00454 00455 static unsigned int 00456 K[64] = 00457 { 00458 0x428a2f98U, 0x71374491U, 0xb5c0fbcfU, 0xe9b5dba5U, 0x3956c25bU, 00459 0x59f111f1U, 0x923f82a4U, 0xab1c5ed5U, 0xd807aa98U, 0x12835b01U, 00460 0x243185beU, 0x550c7dc3U, 0x72be5d74U, 0x80deb1feU, 0x9bdc06a7U, 00461 0xc19bf174U, 0xe49b69c1U, 0xefbe4786U, 0x0fc19dc6U, 0x240ca1ccU, 00462 0x2de92c6fU, 0x4a7484aaU, 0x5cb0a9dcU, 0x76f988daU, 0x983e5152U, 00463 0xa831c66dU, 0xb00327c8U, 0xbf597fc7U, 0xc6e00bf3U, 0xd5a79147U, 00464 0x06ca6351U, 0x14292967U, 0x27b70a85U, 0x2e1b2138U, 0x4d2c6dfcU, 00465 0x53380d13U, 0x650a7354U, 0x766a0abbU, 0x81c2c92eU, 0x92722c85U, 00466 0xa2bfe8a1U, 0xa81a664bU, 0xc24b8b70U, 0xc76c51a3U, 0xd192e819U, 00467 0xd6990624U, 0xf40e3585U, 0x106aa070U, 0x19a4c116U, 0x1e376c08U, 00468 0x2748774cU, 0x34b0bcb5U, 0x391c0cb3U, 0x4ed8aa4aU, 0x5b9cca4fU, 00469 0x682e6ff3U, 0x748f82eeU, 0x78a5636fU, 0x84c87814U, 0x8cc70208U, 00470 0x90befffaU, 0xa4506cebU, 0xbef9a3f7U, 0xc67178f2U 00471 }; /* 32-bit fractional part of the cube root of the first 64 primes */ 00472 00473 unsigned int 00474 A, 00475 B, 00476 C, 00477 D, 00478 E, 00479 F, 00480 G, 00481 H, 00482 shift, 00483 T, 00484 T1, 00485 T2, 00486 W[64]; 00487 00488 shift=32; 00489 p=GetStringInfoDatum(sha_info->message); 00490 if (sha_info->lsb_first == WizardFalse) 00491 { 00492 if (sizeof(unsigned int) <= 4) 00493 for (i=0; i < 16; i++) 00494 { 00495 T=(*((unsigned int *) p)); 00496 p+=4; 00497 W[i]=Trunc32(T); 00498 } 00499 else 00500 for (i=0; i < 16; i+=2) 00501 { 00502 T=(*((unsigned int *) p)); 00503 p+=8; 00504 W[i]=Trunc32(T >> shift); 00505 W[i+1]=Trunc32(T); 00506 } 00507 } 00508 else 00509 if (sizeof(unsigned int) <= 4) 00510 for (i=0; i < 16; i++) 00511 { 00512 T=(*((unsigned int *) p)); 00513 p+=4; 00514 W[i]=((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) | 00515 ((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff); 00516 } 00517 else 00518 for (i=0; i < 16; i+=2) 00519 { 00520 T=(*((unsigned int *) p)); 00521 p+=8; 00522 W[i]=((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) | 00523 ((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff); 00524 T>>=shift; 00525 W[i+1]=((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) | 00526 ((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff); 00527 } 00528 /* 00529 Copy accumulator to registers. 00530 */ 00531 A=sha_info->accumulator[0]; 00532 B=sha_info->accumulator[1]; 00533 C=sha_info->accumulator[2]; 00534 D=sha_info->accumulator[3]; 00535 E=sha_info->accumulator[4]; 00536 F=sha_info->accumulator[5]; 00537 G=sha_info->accumulator[6]; 00538 H=sha_info->accumulator[7]; 00539 for (i=16; i < 64; i++) 00540 W[i]=Trunc32(Sigma1(W[i-2])+W[i-7]+Sigma0(W[i-15])+W[i-16]); 00541 for (j=0; j < 64; j++) 00542 { 00543 T1=Trunc32(H+Suma1(E)+Ch(E,F,G)+K[j]+W[j]); 00544 T2=Trunc32(Suma0(A)+Maj(A,B,C)); 00545 H=G; 00546 G=F; 00547 F=E; 00548 E=Trunc32(D+T1); 00549 D=C; 00550 C=B; 00551 B=A; 00552 A=Trunc32(T1+T2); 00553 } 00554 /* 00555 Add registers back to accumulator. 00556 */ 00557 sha_info->accumulator[0]=Trunc32(sha_info->accumulator[0]+A); 00558 sha_info->accumulator[1]=Trunc32(sha_info->accumulator[1]+B); 00559 sha_info->accumulator[2]=Trunc32(sha_info->accumulator[2]+C); 00560 sha_info->accumulator[3]=Trunc32(sha_info->accumulator[3]+D); 00561 sha_info->accumulator[4]=Trunc32(sha_info->accumulator[4]+E); 00562 sha_info->accumulator[5]=Trunc32(sha_info->accumulator[5]+F); 00563 sha_info->accumulator[6]=Trunc32(sha_info->accumulator[6]+G); 00564 sha_info->accumulator[7]=Trunc32(sha_info->accumulator[7]+H); 00565 /* 00566 Reset working registers. 00567 */ 00568 A=0; 00569 B=0; 00570 C=0; 00571 D=0; 00572 E=0; 00573 F=0; 00574 G=0; 00575 H=0; 00576 T=0; 00577 T1=0; 00578 T2=0; 00579 (void) ResetWizardMemory(W,0,sizeof(W)); 00580 } 00581 00582 /* 00583 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00584 % % 00585 % % 00586 % % 00587 % U p d a t e S H A % 00588 % % 00589 % % 00590 % % 00591 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 00592 % 00593 % UpdateSHA256() updates the SHA256 message accumulator. 00594 % 00595 % The format of the UpdateSHA256 method is: 00596 % 00597 % UpdateSHA256(SHA256Info *sha_info,const StringInfo *message) 00598 % 00599 % A description of each parameter follows: 00600 % 00601 % o sha_info: The address of a structure of type SHA256Info. 00602 % 00603 % o message: The message. 00604 % 00605 */ 00606 WizardExport void UpdateSHA256(SHA256Info *sha_info,const StringInfo *message) 00607 { 00608 register size_t 00609 i; 00610 00611 register unsigned char 00612 *p; 00613 00614 size_t 00615 n; 00616 00617 unsigned int 00618 length; 00619 00620 /* 00621 Update the SHA256 accumulator. 00622 */ 00623 assert(sha_info != (SHA256Info *) NULL); 00624 assert(sha_info->signature == WizardSignature); 00625 n=GetStringInfoLength(message); 00626 length=Trunc32((unsigned int) (sha_info->low_order+(n << 3))); 00627 if (length < sha_info->low_order) 00628 sha_info->high_order++; 00629 sha_info->low_order=length; 00630 sha_info->high_order+=(unsigned int) (n >> 29); 00631 p=GetStringInfoDatum(message); 00632 if (sha_info->offset != 0) 00633 { 00634 i=GetStringInfoLength(sha_info->message)-sha_info->offset; 00635 if (i > n) 00636 i=n; 00637 (void) CopyWizardMemory(GetStringInfoDatum(sha_info->message)+ 00638 sha_info->offset,p,i); 00639 n-=i; 00640 p+=i; 00641 sha_info->offset+=i; 00642 if (sha_info->offset != GetStringInfoLength(sha_info->message)) 00643 return; 00644 TransformSHA256(sha_info); 00645 } 00646 while (n >= GetStringInfoLength(sha_info->message)) 00647 { 00648 SetStringInfoDatum(sha_info->message,p); 00649 p+=GetStringInfoLength(sha_info->message); 00650 n-=GetStringInfoLength(sha_info->message); 00651 TransformSHA256(sha_info); 00652 } 00653 (void) CopyWizardMemory(GetStringInfoDatum(sha_info->message),p,n); 00654 sha_info->offset=n; 00655 /* 00656 Reset working registers. 00657 */ 00658 i=0; 00659 n=0; 00660 length=0; 00661 }
1.7.5