#include "asterisk/sha1.h"
Go to the source code of this file.
Defines | |
#define | SHA1CircularShift(bits, word) (((word) << (bits)) | ((word) >> (32-(bits)))) |
Functions | |
int | SHA1Input (SHA1Context *context, const uint8_t *message_array, unsigned length) |
void | SHA1PadMessage (SHA1Context *) |
void | SHA1ProcessMessageBlock (SHA1Context *) |
int | SHA1Reset (SHA1Context *context) |
int | SHA1Result (SHA1Context *context, uint8_t Message_Digest[SHA1HashSize]) |
#define SHA1CircularShift | ( | bits, | |||
word | ) | (((word) << (bits)) | ((word) >> (32-(bits)))) |
int SHA1Input | ( | SHA1Context * | context, | |
const uint8_t * | message_array, | |||
unsigned | length | |||
) |
Definition at line 183 of file sha1.c.
References context, SHA1ProcessMessageBlock(), shaNull, shaStateError, and shaSuccess.
Referenced by ast_sha1_hash().
00184 { 00185 if (!length) { 00186 return shaSuccess; 00187 } 00188 00189 if (!context || !message_array) { 00190 return shaNull; 00191 } 00192 00193 if (context->Computed) { 00194 context->Corrupted = shaStateError; 00195 return shaStateError; 00196 } 00197 00198 if (context->Corrupted) { 00199 return context->Corrupted; 00200 } 00201 00202 while (length-- && !context->Corrupted) { 00203 context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF); 00204 00205 context->Length_Low += 8; 00206 if (context->Length_Low == 0) { 00207 context->Length_High++; 00208 if (context->Length_High == 0) { 00209 /* Message is too long */ 00210 context->Corrupted = 1; 00211 } 00212 } 00213 00214 if (context->Message_Block_Index == 64) { 00215 SHA1ProcessMessageBlock(context); 00216 } 00217 00218 message_array++; 00219 } 00220 00221 return shaSuccess; 00222 }
void SHA1PadMessage | ( | SHA1Context * | ) |
Definition at line 346 of file sha1.c.
References context, and SHA1ProcessMessageBlock().
Referenced by SHA1Result().
00347 { 00348 /* 00349 * Check to see if the current message block is too small to hold 00350 * the initial padding bits and length. If so, we will pad the 00351 * block, process it, and then continue padding into a second 00352 * block. 00353 */ 00354 if (context->Message_Block_Index > 55) { 00355 context->Message_Block[context->Message_Block_Index++] = 0x80; 00356 while (context->Message_Block_Index < 64) { 00357 context->Message_Block[context->Message_Block_Index++] = 0; 00358 } 00359 00360 SHA1ProcessMessageBlock(context); 00361 00362 while (context->Message_Block_Index < 56) { 00363 context->Message_Block[context->Message_Block_Index++] = 0; 00364 } 00365 } else { 00366 context->Message_Block[context->Message_Block_Index++] = 0x80; 00367 while (context->Message_Block_Index < 56) { 00368 context->Message_Block[context->Message_Block_Index++] = 0; 00369 } 00370 } 00371 00372 /* 00373 * Store the message length as the last 8 octets 00374 */ 00375 context->Message_Block[56] = context->Length_High >> 24; 00376 context->Message_Block[57] = context->Length_High >> 16; 00377 context->Message_Block[58] = context->Length_High >> 8; 00378 context->Message_Block[59] = context->Length_High; 00379 context->Message_Block[60] = context->Length_Low >> 24; 00380 context->Message_Block[61] = context->Length_Low >> 16; 00381 context->Message_Block[62] = context->Length_Low >> 8; 00382 context->Message_Block[63] = context->Length_Low; 00383 00384 SHA1ProcessMessageBlock(context); 00385 }
void SHA1ProcessMessageBlock | ( | SHA1Context * | ) |
Definition at line 244 of file sha1.c.
References context, SHA1CircularShift, and t.
Referenced by SHA1Input(), and SHA1PadMessage().
00245 { 00246 const uint32_t K[] = { /* Constants defined in SHA-1 */ 00247 0x5A827999, 00248 0x6ED9EBA1, 00249 0x8F1BBCDC, 00250 0xCA62C1D6 00251 }; 00252 int t; /* Loop counter */ 00253 uint32_t temp; /* Temporary word value */ 00254 uint32_t W[80]; /* Word sequence */ 00255 uint32_t A, B, C, D, E; /* Word buffers */ 00256 00257 /* 00258 * Initialize the first 16 words in the array W 00259 */ 00260 for (t = 0; t < 16; t++) { 00261 W[t] = context->Message_Block[t * 4] << 24; 00262 W[t] |= context->Message_Block[t * 4 + 1] << 16; 00263 W[t] |= context->Message_Block[t * 4 + 2] << 8; 00264 W[t] |= context->Message_Block[t * 4 + 3]; 00265 } 00266 00267 for (t = 16; t < 80; t++) { 00268 W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); 00269 } 00270 00271 A = context->Intermediate_Hash[0]; 00272 B = context->Intermediate_Hash[1]; 00273 C = context->Intermediate_Hash[2]; 00274 D = context->Intermediate_Hash[3]; 00275 E = context->Intermediate_Hash[4]; 00276 00277 for (t = 0; t < 20; t++) { 00278 temp = SHA1CircularShift(5,A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0]; 00279 E = D; 00280 D = C; 00281 C = SHA1CircularShift(30,B); 00282 B = A; 00283 A = temp; 00284 } 00285 00286 for (t = 20; t < 40; t++) { 00287 temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1]; 00288 E = D; 00289 D = C; 00290 C = SHA1CircularShift(30,B); 00291 B = A; 00292 A = temp; 00293 } 00294 00295 for (t = 40; t < 60; t++) { 00296 temp = SHA1CircularShift(5,A) + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; 00297 E = D; 00298 D = C; 00299 C = SHA1CircularShift(30,B); 00300 B = A; 00301 A = temp; 00302 } 00303 00304 for (t = 60; t < 80; t++) { 00305 temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3]; 00306 E = D; 00307 D = C; 00308 C = SHA1CircularShift(30,B); 00309 B = A; 00310 A = temp; 00311 } 00312 00313 context->Intermediate_Hash[0] += A; 00314 context->Intermediate_Hash[1] += B; 00315 context->Intermediate_Hash[2] += C; 00316 context->Intermediate_Hash[3] += D; 00317 context->Intermediate_Hash[4] += E; 00318 00319 context->Message_Block_Index = 0; 00320 }
int SHA1Reset | ( | SHA1Context * | context | ) |
Definition at line 91 of file sha1.c.
References context, shaNull, and shaSuccess.
Referenced by ast_sha1_hash().
00092 { 00093 if (!context) { 00094 return shaNull; 00095 } 00096 00097 context->Length_Low = 0; 00098 context->Length_High = 0; 00099 context->Message_Block_Index = 0; 00100 00101 context->Intermediate_Hash[0] = 0x67452301; 00102 context->Intermediate_Hash[1] = 0xEFCDAB89; 00103 context->Intermediate_Hash[2] = 0x98BADCFE; 00104 context->Intermediate_Hash[3] = 0x10325476; 00105 context->Intermediate_Hash[4] = 0xC3D2E1F0; 00106 00107 context->Computed = 0; 00108 context->Corrupted = 0; 00109 00110 return shaSuccess; 00111 }
int SHA1Result | ( | SHA1Context * | context, | |
uint8_t | Message_Digest[SHA1HashSize] | |||
) |
Definition at line 132 of file sha1.c.
References context, SHA1PadMessage(), shaNull, and shaSuccess.
Referenced by ast_sha1_hash().
00134 { 00135 int i; 00136 00137 if (!context || !Message_Digest) { 00138 return shaNull; 00139 } 00140 00141 if (context->Corrupted) { 00142 return context->Corrupted; 00143 } 00144 00145 if (!context->Computed) { 00146 SHA1PadMessage(context); 00147 for (i = 0; i < 64; ++i) { 00148 /* message may be sensitive, clear it out */ 00149 context->Message_Block[i] = 0; 00150 } 00151 context->Length_Low = 0; /* and clear length */ 00152 context->Length_High = 0; 00153 context->Computed = 1; 00154 } 00155 00156 for (i = 0; i < SHA1HashSize; ++i) { 00157 Message_Digest[i] = context->Intermediate_Hash[i >> 2] >> 8 * ( 3 - ( i & 0x03 ) ); 00158 } 00159 00160 return shaSuccess; 00161 }