J2ME的DES加密类库.docx
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J2ME的DES加密类库
//DES算法（DES.Java类文件）
publicclassDES{
//声明常量字节数组
privatestaticfinalint[]IP={
58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,
46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,
25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,
13,5,63,55,47,39,31,23,15,7
};//64
privatestaticfinalint[]IP_1={
40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,
46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,
52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,
58,26,33,1,41,9,49,17,57,25
};//64
privatestaticfinalint[]PC_1={
57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,
43,35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,
62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,
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
};//48
privatestaticfinalint[]P={
16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,2,8,
24,14,32,27,3,9,19,13,30,6,22,11,4,25
};//32
privatestaticfinalint[][][]S_Box={
{
{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[1]
{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[2]
{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[3]
{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[4]
{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[5]
{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[6]
{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[7]
{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}
}//S_Box[8]
};
privatestaticfinalint[]LeftMove={
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};//左移位置列表
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
}
for（i=0;i<16;i++）{
LeftBitMove（K0,LeftMove[i]）;
//特别注意：
xxx[IP[i]-1]等类似变换
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
privatebyte[]Encrypt（int[]timeData,intflag,int[][]keyarray）{
inti;
byte[]encrypt=newbyte[8];
intflags=flag;
int[]M=newint[64];
int[]MIP_1=newint[64];
//特别注意：
xxx[IP[i]-1]等类似变换
for（i=0;i<64;i++）{
M[i]=timeData[IP[i]-1];//明文IP变换
}
if（flags==1）{//加密
for（i=0;i<16;i++）{
LoopF（M,i,flags,keyarray）;
}
}elseif（flags==0）{//解密
for（i=15;i>-1;i--）{
LoopF（M,i,flags,keyarray）;
}
}
for（i=0;i<64;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;
}
privateint[]ReadDataToBirnaryIntArray（byte[]intdata）{
inti;
intj;
//将数据转换为二进制数，存储到数组
int[]IntDa=newint[8];
for（i=0;i<8;i++）{
IntDa[i]=intdata[i];
if（IntDa[i]<0）{
IntDa[i]+=256;
IntDa[i]%=256;
}
}
int[]IntVa=newint[64];
for（i=0;i<8;i++）{
for（j=0;j<8;j++）{
IntVa[（（i*8）+7）-j]=IntDa[i]%2;
IntDa[i]=IntDa[i]/2;
}
}
returnIntVa;
}
privatevoidLeftBitMove（int[]k,intoffset）{
inti;
//循环移位操作函数
int[]c0=newint[28];
int[]d0=newint[28];
int[]c1=newint[28];
int[]d1=newint[28];
for（i=0;i<28;i++）{
c0[i]=k[i];
d0[i]=k[i+28];
}
if（offset==1）{
for（i=0;i<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）{
for（i=0;i<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];
}
for（i=0;i<28;i++）{
k[i]=c1[i];
k[i+28]=d1[i];
}
}
privatevoidLoopF（int[]M,inttimes,intflag,int[][]keyarray）{
inti;
intj;
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];
for（i=0;i<32;i++）{
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
}
for（i=0;i<48;i++）{
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;
}
}
for（i=0;i<8;i++）{//48位分成8组
for（j=0;j<6;j++）{
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
for（j=0;j<4;j++）{
sValue[（（i*4）+3）-j]=sBoxData[i]%2;
sBoxData[i]=sBoxData[i]/2;
}
}
for（i=0;i<32;i++）{
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];
}
}
}
privatevoidGetEncryptResultOfByteArray（int[]data,byte[]value）{
inti;
intj;
//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）
for（i=0;i<8;i++）{
for（j=0;j<8;j++）{
value[i]+=（data[（i<<3）+j]<<（7-j））;
}
}
for（i=0;i<8;i++）{
value[i]%=256;
if（value[i]>128）{
value[i]-=255;
}
}
}
privatebyte[]ByteDataFormat（byte[]data）{
intlen=data.length;
intpadlen=8-（len%8）;
intnewlen=len+padlen;
byte[]newdata=newbyte[newlen];
System.arraycopy（data,0,newdata,0,len）;
for（inti=len;inewdata[i]=（byte）padlen;
returnnewdata;
}
publicbyte[]DesEncrypt（byte[]des_key,byte[]des_data,intflag）{
byte[]format_key=ByteDataFormat（des_key）;
byte[]format_data=ByteDataFormat（des_data）;
intdatalen=format_data.length;
intunitcount=datalen/8;
byte[]result_data=newbyte[datalen];
for（inti=0;ibyte[]tmpkey=newbyte[8];
byte[]tmpdata=newbyte[8];
System.arraycopy（format_key,0,tmpkey,0,8）;
System.arraycopy（format_data,i*8,tmpdata,0,8）;
byte[]tmpresult=UnitDes（tmpkey,tmpdata,flag）;
System.arraycopy（tmpresult,0,result_data,i*8,8）;
}
returnresult_data;
}
publicstaticStringstrToDes（StringstrData1,StringstrKey1）{
intbytelen1=strData1.getBytes（）.length;
byte[]result1=newbyte[（bytelen1+8）-（bytelen1%8）];
byte[]bytekey1=strKey1.getBytes（）;
byte[]bytedata1=strData1.getBytes（）;
StringstrEjz01,strSLjz01;
StringstrSLjz02="";
DESdes001=newDES（）;
result1=des001.DesEncrypt（bytekey1,bytedata1,1）;
for（inti01=0;i01strEjz01=Integer.toBinaryString（Math.abs（result1[i01]））;
strEjz01="00000000"+strEjz01;
strEjz01=strEjz01.subst
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