java实现Des对TXT文件内容的加解密Word文件下载.docx
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java实现Des对TXT文件内容的加解密Word文件下载.docx
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61,53,45,37,29,21,13,5,28,20,12,4};
//56
privatestaticfinalint[]PC_2={14,17,11,24,1,5,3,28,15,6,21,
10,23,19,12,4,26,8,16,7,27,20,13,2,41,52,31,37,47,
55,30,40,51,45,33,48,44,49,39,56,34,53,46,42,50,36,
29,32};
//48
privatestaticfinalint[]E={32,1,2,3,4,5,4,5,6,7,8,9,8,9,
10,11,12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,
21,22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,1};
privatestaticfinalint[]P={7,16,20,21,29,12,28,17,1,15,23,
26,5,18,31,10,2,8,24,14,32,27,9,3,19,13,30,6,22,
11,4,25};
//32
privatestaticfinalint[][][]S_Box={//S-盒
{//S_Box[1]
{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}},
{//S_Box[2]
{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}},
{//S_Box[3]
{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}},
{//S_Box[4]
{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}},
{//S_Box[5]
{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}},
{//S_Box[6]
{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}},
{//S_Box[7]
{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}},
{//S_Box[8]
{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}
};
//左移位置列表
privatestaticfinalint[]LeftMove={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
byte[]bytekey;
//密码的二进制数组
publicSY_1_DesUtil(StringstrKey){
this.bytekey=strKey.getBytes();
}
privatebyte[]UnitDes(byte[]des_key,byte[]des_data,intflag){
//检测输入参数格式是否正确,错误直接返回空值(null)
if((des_key.length!
=8)||(des_data.length!
=8)||((flag!
=1)&
&
(flag!
=0))){
thrownewRuntimeException("
DataFormatError!
"
);
}
intflags=flag;
//二进制加密密钥
int[]keydata=newint[64];
//二进制加密数据
int[]encryptdata=newint[64];
//加密操作完成后的字节数组
byte[]EncryptCode=newbyte[8];
//密钥初试化成二维数组
int[][]KeyArray=newint[16][48];
//将密钥字节数组转换成二进制字节数组
keydata=ReadDataToBirnaryIntArray(des_key);
//将加密数据字节数组转换成二进制字节数组
encryptdata=ReadDataToBirnaryIntArray(des_data);
//初试化密钥为二维密钥数组
KeyInitialize(keydata,KeyArray);
//执行加密解密操作
EncryptCode=Encrypt(encryptdata,flags,KeyArray);
returnEncryptCode;
//初试化密钥数组
privatevoidKeyInitialize(int[]key,int[][]keyarray){
inti;
intj;
int[]K0=newint[56];
//特别注意:
xxx[IP[i]-1]等类似变换
for(i=0;
i<
56;
i++){
K0[i]=key[PC_1[i]-1];
//密钥进行PC-1变换
16;
LeftBitMove(K0,LeftMove[i]);
//特别注意:
for(j=0;
j<
48;
j++){
keyarray[i][j]=K0[PC_2[j]-1];
//生成子密钥keyarray[i][j]
}
}
//执行加密解密操作,flag,为1加密,为0解密
privatebyte[]Encrypt(int[]timeData,intflag,int[][]keyarray){
byte[]encrypt=newbyte[8];
int[]M=newint[64];
int[]MIP_1=newint[64];
//特别注意:
64;
M[i]=timeData[IP[i]-1];
//明文IP变换
if(flags==1){//加密
for(i=0;
LoopF(M,i,flags,keyarray);
}
elseif(flags==0){//解密
for(i=15;
i>
-1;
i--){
MIP_1[i]=M[IP_1[i]-1];
//进行IP-1运算
GetEncryptResultOfByteArray(MIP_1,encrypt);
//返回加密数据
returnencrypt;
//将数据转换为二进制数,存储到数组
privateint[]ReadDataToBirnaryIntArray(byte[]intdata){
int[]IntDa=newint[8];
8;
IntDa[i]=intdata[i];
if(IntDa[i]<
0){
IntDa[i]+=256;
IntDa[i]%=256;
int[]IntVa=newint[64];
IntVa[((i*8)+7)-j]=IntDa[i]%2;
IntDa[i]=IntDa[i]/2;
returnIntVa;
////循环移位操作
privatevoidLeftBitMove(int[]k,intoffset){
int[]c0=newint[28];
int[]d0=newint[28];
int[]c1=newint[28];
int[]d1=newint[28];
28;
c0[i]=k[i];
d0[i]=k[i+28];
if(offset==1){
27;
i++){//循环左移一位
c1[i]=c0[i+1];
d1[i]=d0[i+1];
}
c1[27]=c0[0];
d1[27]=d0[0];
elseif(offset==2){
26;
i++){//循环左移两位
c1[i]=c0[i+2];
d1[i]=d0[i+2];
c1[26]=c0[0];
d1[26]=d0[0];
c1[27]=c0[1];
d1[27]=d0[1];
k[i]=c1[i];
k[i+28]=d1[i];
//进行一轮迭代
privatevoidLoopF(int[]M,inttimes,intflag,int[][]keyarray){
int[]L0=newint[32];
int[]R0=newint[32];
int[]L1=newint[32];
int[]R1=newint[32];
int[]RE=newint[48];
int[][]S=newint[8][6];
int[]sBoxData=newint[8];
int[]sValue=newint[32];
int[]RP=newint[32];
32;
L0[i]=M[i];
//明文左侧的初始化
R0[i]=M[i+32];
//明文右侧的初始化
RE[i]=R0[E[i]-1];
//经过E变换扩充,由32位变为48位
RE[i]=RE[i]+keyarray[times][i];
//与KeyArray[times][i]按位作不进位加法运算
if(RE[i]==2){
RE[i]=0;
i++){//48位分成8组
6;
S[i][j]=RE[(i*6)+j];
//下面经过S盒,得到8个数
sBoxData[i]=S_Box[i][(S[i][0]<
<
1)+S[i][5]][(S[i][1]<
3)
+(S[i][2]<
2)+(S[i][3]<
1)+S[i][4]];
//8个数变换输出二进制
4;
sValue[((i*4)+3)-j]=sBoxData[i]%2;
sBoxData[i]=sBoxData[i]/2;
RP[i]=sValue[P[i]-1];
//经过P变换
L1[i]=R0[i];
//右边移到左边
R1[i]=L0[i]+RP[i];
if(R1[i]==2){
R1[i]=0;
//重新合成M,返回数组M
//最后一次变换时,左右不进行互换。
此处采用两次变换实现不变
if(((flag==0)&
(times==0))||((flag==1)&
(times==15))){
M[i]=R1[i];
M[i+32]=L1[i];
else{
M[i]=L1[i];
M[i+32]=R1[i];
//将存储64位二进制数据的数组中的数据转换为八个整数(byte)
privatevoidGetEncryptResultOfByteArray(int[]data,byte[]value){
for(j=0;
value[i]+=(data[(i<
3)+j]<
(7-j));
value[i]%=256;
if(value[i]>
128){
value[i]-=255;
privatebyte[]ByteDataFormat(byte[]data,intflag){
intlen=data.length;
intpadlen=8-(len%8);
intnewlen=len+padlen;
byte[]newdata=newbyte[newlen];
System.arraycopy(data,0,newdata,0,len);
for(inti=len;
newlen;
i++)
newdata[i]=(byte)padlen;
returnnewdata;
publicbyte[]DesEncrypt(byte[]des_data,intflag){
byte[]format_key=ByteDataFormat(bytekey,flag);
byte[]format_data=ByteDataFormat(des_data,flag);
intdatalen=format_data.length;
intunitcount=datalen/8;
byte[]result_data=newbyte[datalen];
for(inti=0;
unitcount;
byte[]tmpkey=newbyte[8];
byte[]tmpdata=newbyte[8];
System.arraycopy(format_key,0,tmpkey,0,8);
System.arraycopy(format_data,i*8,tmpdata,0,8);
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