SHA-1.rar_SHA_sha-1_sha-1 c

#include "sha1.h" //循环左移 #define SHA1CircularShift(bits,word) (((word)<<(bits))|((word)>>(32-(bits)))) void SHA1PadMessage(SHA1Context *); void SHA1ProcessMessageBlock(SHA1Context *); //数据初始化之操作 int SHA1Reset(SHA1Context *context) { if (!context) { return shaNull; } context->Length_Low=0; context->Length_High=0; context->Message_Block_Index=0; context->Intermediate_Hash[0]=0x67452301; context->Intermediate_Hash[1]=0xEFCDAB89; context->Intermediate_Hash[2]=0x98BADCFE; context->Intermediate_Hash[3]=0x10325476; context->Intermediate_Hash[4]=0xC3D2E1F0; context->Computed=0; context->Corrupted=0; return shaSuccess; } //SHA-1结果描述：该算法将会返回一个160比特的消息摘要队列或者输出计算错误 int SHA1Result(SHA1Context *context,uint8_t Message_Digest[SHA1HashSize]) { int i; if(!context||!Message_Digest) { return shaNull; } if (context->Corrupted) { return context->Corrupted; } if (!context->Computed) { SHA1PadMessage(context); for(i=0;i<64;++i) { //消息清零 context->Message_Block[i]=0; } context->Length_Low=0; //长度清零 context->Length_High=0; context->Computed=1; } for(i=0;i<SHA1HashSize;++i) { Message_Digest[i] = context->Intermediate_Hash[i>>2]>>8*(3-(i&0x03)); } return shaSuccess; } //SHA-11输入描述：接收单位长度为8字节倍数的消息 int SHA1Input(SHA1Context *context,const uint8_t *message_array,unsigned length) { if (!length) { return shaSuccess; } if (!context||!message_array) { return shaNull; } if (context->Computed) { context->Corrupted=shaStateError; return shaStateError; } if (context->Corrupted) { return context->Corrupted; } while(length-- && !context->Corrupted) { context->Message_Block[context->Message_Block_Index++]=(*message_array&0xFF); context->Length_Low+=8; if (context->Length_Low==0) { context->Length_High++; if (context->Length_High==0) { //消息过长 context->Corrupted=1; } } if (context->Message_Block_Index==64) { SHA1ProcessMessageBlock(context); } message_array++; } return shaSuccess; } //SHA-a消息块描述：消息块长度为固定之512比特 void SHA1ProcessMessageBlock(SHA1Context *context) { const uint32_t K[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6}; int t;//循环计数 uint32_t temp;//临时缓存 uint32_t W[80];//字顺序 uint32_t A, B, C, D, E;//设置系统磁盘缓存块 //初始化在W队列中的头16字数据 for(t = 0; t < 16; t++) { W[t]=context->Message_Block[t*4]<<24; W[t]|=context->Message_Block[t*4+1]<<16; W[t]|=context->Message_Block[t*4+2]<<8; W[t]|=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->Intermediate_Hash[0]; B=context->Intermediate_Hash[1]; C=context->Intermediate_Hash[2]; D=context->Intermediate_Hash[3]; E=context->Intermediate_Hash[4]; //定义算法所用之数学函数及其迭代算法描述 for(t=0;t<20;t++) { temp=SHA1CircularShift(5,A)+((B&C)|((~B)&D))+E+W[t]+K[0]; 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]; 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]; 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]; E=D; D=C; C=SHA1CircularShift(30,B); B=A; A=temp; } //迭代算法第80步（最后一步）描述 context->Intermediate_Hash[0]+=A; context->Intermediate_Hash[1]+=B; context->Intermediate_Hash[2]+=C; context->Intermediate_Hash[3]+=D; context->Intermediate_Hash[4]+=E; context->Message_Block_Index=0; } //数据填充模块 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; } } //把最后64位保存为数据长度 context->Message_Block[56]=context->Length_High>>24; context->Message_Block[57]=context->Length_High>>16; context->Message_Block[58]=context->Length_High>>8; context->Message_Block[59]=context->Length_High; context->Message_Block[60]=context->Length_Low>>24; context->Message_Block[61]=context->Length_Low>>16; context->Message_Block[62]=context->Length_Low>>8; context->Message_Block[63]=context->Length_Low; SHA1ProcessMessageBlock(context); }