using system.security.cryptography
using system.io
using system.text
public class encryptstringdes {
public static void main(string)
return
}
// 使用utf8函数加密输入参数
utf8encoding utf8encoding = new utf8encoding()
byte.tochararray())
// 方式一：调用默认的des实现方法des_csp.
des des = des.create()
// 方式二：直接使用des_csp()实现des的实体
//des_csp des = new des_csp()
// 初始化des加密的密钥和一个随机的、8比特的初始化向量(iv)
byte iv = {0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef}
des.key = key
des.iv = iv
// 建立加密流
symmetricstreamencryptor sse = des.createencryptor()
// 使用cryptomemorystream方法获取加密过程的输出
cryptomemorystream cms = new cryptomemorystream()
// 将symmetricstreamencryptor流中的加密数据输出到cryptomemorystream中
sse.setsink(cms)
// 加密完毕，将结果输出到控制台
sse.write(inputbytearray)
sse.closestream()
// 获取加密数据
byte)
}
console.writeline()
//上面演示了如何进行加密，下面演示如何进行解密
symmetricstreamdecryptor ssd = des.createdecryptor()
cms = new cryptomemorystream()
ssd.setsink(cms)
ssd.write(encrypteddata)
ssd.closestream()
byte decryptedchararray = utf8encoding.getchars(decrypteddata)
console.writeline("解密后数据：")
console.write(decryptedchararray)
console.writeline()
}
}
编译：
d:\csharp>csc des_demo.cs
microsoft (r) c# compiler version 7.00.8905
copyright (c) microsoft corp 2000. all rights reserved.
运行实例：
d:\csharp>des_demo.exe 使用c#编写des加密程序的framework
加密结果：
3d 22 64 c6 57 d1 c4 c3 cf 77 ce 2f d0 e1 78 2a 4d ed 7a a8 83 f9 0e 14 e1 ba 38
7b 06 41 8d b5 e9 3f 00 0d c3 28 d1 f9 6d 17 4b 6e a7 41 68 40
#include <stdio.h> #include <string.h> #include <windows.h> #include <conio.h> #include "Schedle.h" class CShift{ public: DWORDLONG mask[16] int step[16] CShift(){ for(int i=0i<16i++){ step[i]=2 mask[i]=0xc000000 } step[0]=step[1]=step[8]=step[15]=1 mask[0]=mask[1]=mask[8]=mask[15]=0x8000000 } } class CDES{ public: CDES(){ m_dwlKey=0 m_dwlData=0 ConvertTableToMask(dwlKey_PC_1,64) //PrintTable(dwlKey_PC_1,7,8) ConvertTableToMask(dwlKey_PC_2,56) ConvertTableToMask(dwlData_IP,64) ConvertTableToMask(dwlData_Expansion,32) ConvertTableToMask(dwlData_FP,64) ConvertTableToMask(dwlData_P,32) Generate_S() } void PrintBit(DWORDLONG) void EncryptKey(char *) unsigned char* EncryptData(unsigned char *) unsigned char* DescryptData(unsigned char*) private: void ConvertTableToMask(DWORDLONG *,int) void Generate_S(void) void PrintTable(DWORDLONG*,int,int) DWORDLONG ProcessByte(unsigned char*,BOOL) DWORDLONG PermuteTable(DWORDLONG,DWORDLONG*,int) void Generate_K(void) void EncryptKernel(void) DWORDLONG Generate_B(DWORDLONG,DWORDLONG*) /*For verify schedule permutation only*/ DWORDLONG UnPermuteTable(DWORDLONG,DWORDLONG*,int) /**************************************/ DWORDLONG dwlData_S[9][4][16] CShift m_shift DWORDLONG m_dwlKey DWORDLONG m_dwlData DWORDLONG m_dwl_K[17] } void CDES::EncryptKey(char *key){ printf("\nOriginal Key: %s",key) m_dwlKey=ProcessByte((unsigned char*)key,TRUE) // PrintBit(m_dwlKey) m_dwlKey=PermuteTable(m_dwlKey,dwlKey_PC_1,56) // PrintBit(m_dwlKey) Generate_K() // printf("\n******************************************\n") } void CDES::Generate_K(void){ DWORDLONG C[17],D[17],tmp C[0]=m_dwlKey>>28 D[0]=m_dwlKey&0xfffffff for(int i=1i<=16i++){ tmp=(C[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]) C[i]=((C[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff tmp=(D[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]) D[i]=((D[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff m_dwl_K[i]=(C[i]<<28)|D[i] m_dwl_K[i]=PermuteTable(m_dwl_K[i],dwlKey_PC_2,48) } } DWORDLONG CDES::ProcessByte(unsigned char *key,BOOL shift){ unsigned char tmp DWORDLONG byte=0 int i=0 while(i<8){ while(*key){ if(byte!=0) byte<<=8 tmp=*key if(shift) tmp<<=1 byte|=tmp i++ key++ } if(i<8) byte<<=8 i++ } return byte } DWORDLONG CDES::PermuteTable(DWORDLONG dwlPara,DWOR 基于des算法的rfid安全系统DLONG* dwlTable,int nDestLen){ int i=0 DWORDLONG tmp=0,moveBit while(i<nDestLen){ moveBit=1 if(dwlTable[i]&dwlPara){ moveBit<<=nDestLen-i-1 tmp|=moveBit } i++ } return tmp } DWORDLONG CDES::UnPermuteTable(DWORDLONG dwlPara,DWORDLONG* dwlTable,int nDestLen){ DWORDLONG tmp=0 int i=nDestLen-1 while(dwlPara!=0){ if(dwlPara&0x01) tmp|=dwlTable[i] dwlPara>>=1 i-- } return tmp } void CDES::PrintTable(DWORDLONG *dwlPara,int col,int row){ int i,j for(i=0i<rowi++){ printf("\n") getch() for(j=0j<colj++) PrintBit(dwlPara[i*col+j]) } } void CDES::PrintBit(DWORDLONG bitstream){ char out[76] int i=0,j=0,space=0 while(bitstream!=0){ if(bitstream&0x01) out[i++]='1' else out[i++]='0' j++ if(j%8==0){ out[i++]=' ' space++ } bitstream=bitstream>>1 } out[i]='\0' strcpy(out,strrev(out)) printf("%s **:%d\n",out,i-space) } void CDES::ConvertTableToMask(DWORDLONG *mask,int max){ int i=0 DWORDLONG nBit=1 while(mask[i]!=0){ nBit=1 nBit<<=max-mask[i] mask[i++]=nBit } } void CDES::Generate_S(void){ int i int j,m,n m=n=0 j=1 for(i=0i<512i++){ dwlData_S[j][m][n]=OS[i] n=(n+1)%16 if(!n){ m=(m+1)%4 if(!m) j++ } } } unsigned char * CDES::EncryptData(unsigned char *block){ unsigned char *EncrytedData=new unsigned char(15) printf("\nOriginal Data: %s\n",block) m_dwlData=ProcessByte(block,0) // PrintBit(m_dwlData) m_dwlData=PermuteTable(m_dwlData,dwlData_IP,64) EncryptKernel() // PrintBit(m_dwlData) DWORDLONG bit6=m_dwlData for(int i=0i<11i++){ EncrytedData[7-i]=(unsigned char)(bit6&0x3f)+46 bit6>>=6 } EncrytedData[11]='\0' printf("\nAfter Encrypted: %s",EncrytedData) for(i=0i<8i++){ EncrytedData[7-i]=(unsigned char)(m_dwlData&0xff) m_dwlData>>=8 } EncrytedData[8]='\0' return EncrytedData } void CDES::EncryptKernel(void){ int i=1 DWORDLONG L[17],R[17],B[9],EK,PSB L[0]=m_dwlData>>32 R[0]=m_dwlData&0xffffffff for(i=1i<=16i++){ L[i]=R[i-1] R[i-1]=PermuteTable(R[i-1],dwlData_Expansion,48)//Expansion R EK=R[i-1]^m_dwl_K[i]//E Permutation PSB=Generate_B(EK,B)//P Permutation R[i]=L[i-1]^PSB } R[16]<<=32 m_dwlData=R[16]|L[16] m_dwlData=PermuteTable(m_dwlData,dwlData_FP,64) } unsigned char* CDES::DescryptData(unsigned char *desData){ int i=1 unsigned char *DescryptedData=new unsigned char(15) DWORDLONG L[17],R[17],B[9],EK,PSB DWORDLONG dataPara dataPara=ProcessByte(desData,0) dataPara=PermuteTable(dataPara,dwlData_IP,64) R[16]=dataPara>>32 L[16]=dataPara&0xffffffff for(i=16i>=1i--){ R[i-1]=L[i] L[i]=PermuteTable(L[i],dwlData_Expansion,48)//Expansion L EK=L[i]^m_dwl_K[i]//E Permutation PSB=Generate_B(EK,B)//P Permutation L[i-1]=R[i]^PSB } L[0]<<=32 dataPara=L[0]|R[0] dataPara=PermuteTable(dataPara,dwlData_FP,64) // PrintBit(dataPara) for(i=0i<8i++){ DescryptedData[7-i]=(unsigned char)(dataPara&0xff) dataPara>>=8 } DescryptedData[8]='\0' printf("\nAfter Decrypted: %s\n",DescryptedData) return DescryptedData } DWORDLONG CDES::Generate_B(DWORDLONG EKPara,DWORDLONG *block){ int i,m,n DWORDLONG tmp=0 for(i=8i>0i--){ block[i]=EKPara&0x3f m=(int)(block[i]&0x20)>>4 m|=block[i]&0x01 n=(int)(block[i]<<1)>>2 block[i]=dwlData_S[i][m][n] EKPara>>=6 } for(i=1i<=8i++){ tmp|=block[i] tmp<<=4 } tmp>>=4 tmp=PermuteTable(tmp,dwlData_P,32) return tmp } void main(void){ CDES des des.EncryptKey("12345678") unsigned char *result=des.EncryptData((unsigned char*)"DemoData") des.DescryptData(result) }[1]
