SHA1 C实现

来源：互联网发布：大帮手工资软件编辑：程序博客网时间：2024/05/22 16:20
#ifndef _SHA1_H_#define _SHA1_H_typedef struct SHA1Context{unsigned Message_Digest[5];      unsigned Length_Low;             unsigned Length_High;            unsigned char Message_Block[64]; int Message_Block_Index;         int Computed;                    int Corrupted;                   } SHA1Context;void SHA1Reset(SHA1Context *);int SHA1Result(SHA1Context *);void SHA1Input( SHA1Context *,const char *,unsigned);#endif#define SHA1CircularShift(bits,word) ((((word) << (bits)) & 0xFFFFFFFF) | ((word) >> (32-(bits))))void SHA1ProcessMessageBlock(SHA1Context *);void SHA1PadMessage(SHA1Context *);void SHA1Reset(SHA1Context *context){// 初始化动作context->Length_Low             = 0;context->Length_High            = 0;context->Message_Block_Index    = 0;context->Message_Digest[0]      = 0x67452301;context->Message_Digest[1]      = 0xEFCDAB89;context->Message_Digest[2]      = 0x98BADCFE;context->Message_Digest[3]      = 0x10325476;context->Message_Digest[4]      = 0xC3D2E1F0;context->Computed   = 0;context->Corrupted  = 0;}int SHA1Result(SHA1Context *context){// 成功返回1，失败返回0if (context->Corrupted) {return 0;}if (!context->Computed) {SHA1PadMessage(context);context->Computed = 1;}return 1;}void SHA1Input(SHA1Context *context,const char *message_array,unsigned length){if (!length) return;if (context->Computed || context->Corrupted){context->Corrupted = 1;return;}while(length-- && !context->Corrupted){context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);context->Length_Low += 8;context->Length_Low &= 0xFFFFFFFF;if (context->Length_Low == 0){context->Length_High++;context->Length_High &= 0xFFFFFFFF;if (context->Length_High == 0) context->Corrupted = 1;}if (context->Message_Block_Index == 64){SHA1ProcessMessageBlock(context);}message_array++;}}void SHA1ProcessMessageBlock(SHA1Context *context){const unsigned K[] = {0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6 };int         t;                unsigned    temp;             unsigned    W[80];            unsigned    A, B, C, D, E;    for(t = 0; t < 16; t++) {W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;W[t] |= ((unsigned) context->Message_Block[t * 4 + 3]);}for(t = 16; t < 80; t++)  W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);A = context->Message_Digest[0];B = context->Message_Digest[1];C = context->Message_Digest[2];D = context->Message_Digest[3];E = context->Message_Digest[4];for(t = 0; t < 20; t++) {temp =  SHA1CircularShift(5,A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0];temp &= 0xFFFFFFFF;E = D;D = C;C = SHA1CircularShift(30,B);B = A;A = temp;}for(t = 20; t < 40; t++) {temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];temp &= 0xFFFFFFFF;E = D;D = C;C = SHA1CircularShift(30,B);B = A;A = temp;}for(t = 40; t < 60; t++) {temp = SHA1CircularShift(5,A) + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];temp &= 0xFFFFFFFF;E = D;D = C;C = SHA1CircularShift(30,B);B = A;A = temp;}for(t = 60; t < 80; t++) {temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];temp &= 0xFFFFFFFF;E = D;D = C;C = SHA1CircularShift(30,B);B = A;A = temp;}context->Message_Digest[0] = (context->Message_Digest[0] + A) & 0xFFFFFFFF;context->Message_Digest[1] = (context->Message_Digest[1] + B) & 0xFFFFFFFF;context->Message_Digest[2] = (context->Message_Digest[2] + C) & 0xFFFFFFFF;context->Message_Digest[3] = (context->Message_Digest[3] + D) & 0xFFFFFFFF;context->Message_Digest[4] = (context->Message_Digest[4] + E) & 0xFFFFFFFF;context->Message_Block_Index = 0;}void SHA1PadMessage(SHA1Context *context){if (context->Message_Block_Index > 55) {context->Message_Block[context->Message_Block_Index++] = 0x80;while(context->Message_Block_Index < 64)  context->Message_Block[context->Message_Block_Index++] = 0;SHA1ProcessMessageBlock(context);while(context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;} else {context->Message_Block[context->Message_Block_Index++] = 0x80;while(context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;}context->Message_Block[56] = (context->Length_High >> 24 ) & 0xFF;context->Message_Block[57] = (context->Length_High >> 16 ) & 0xFF;context->Message_Block[58] = (context->Length_High >> 8 ) & 0xFF;context->Message_Block[59] = (context->Length_High) & 0xFF;context->Message_Block[60] = (context->Length_Low >> 24 ) & 0xFF;context->Message_Block[61] = (context->Length_Low >> 16 ) & 0xFF;context->Message_Block[62] = (context->Length_Low >> 8 ) & 0xFF;context->Message_Block[63] = (context->Length_Low) & 0xFF;SHA1ProcessMessageBlock(context);}int sha1_hash(const char *source, char *lrvar){// MainSHA1Context sha;char buf[128];SHA1Reset(&sha);SHA1Input(&sha, source, strlen(source));if (!SHA1Result(&sha)){lr_error_message("SHA1 ERROR: Could not compute message digest");return -1;} else {memset(buf,0,sizeof(buf));sprintf(buf, "%08X%08X%08X%08X%08X", sha.Message_Digest[0],sha.Message_Digest[1],sha.Message_Digest[2],sha.Message_Digest[3],sha.Message_Digest[4]);lr_save_string(buf, lrvar);return strlen(buf);}}
0 0