H3C-camsDES加密算法研究總結

H3C加密算法研究總結使用的密碼算法為DES+BASE64(DES使用默認的加密密鑰“l(fā)iuan814”從IMC-PLAT.jar中提取出的加密和解密代碼片段CommonUtils.class中的：@ExternalInterfaceprivatestaticfinalbyte[]j="liuan814".getBytes();privatestaticCipherk;privatestaticCipherl;publicstaticbyte[]encryptData(byte[]paramArrayOfByte){if(k==null){try{DESKeySpeclocalDESKeySpec=newDESKeySpec(j);SecretKeyFactorylocalSecretKeyFactory=SecretKeyFactory.getInstance("DES");SecretKeylocalSecretKey=localSecretKeyFactory.generateSecret(localDESKeySpec);k=Cipher.getInstance("DES/ECB/PKCS5Padding");k.init(1,localSecretKey);}catch(ExceptionlocalException1){a.error(null,localException1);returnnull;}}byte[]arrayOfByte=null;try{arrayOfByte=k.doFinal(paramArrayOfByte);}catch(ExceptionlocalException2){a.error(null,localException2);returnnull;}if(arrayOfByte!=null){returnBase64.encodeBase64(arrayOfByte);}returnnull;}@ExternalInterfacepublicstaticbyte[]decryptData(byte[]paramArrayOfByte){if(l==null){try{DESKeySpeclocalDESKeySpec=newDESKeySpec(j);SecretKeyFactorylocalSecretKeyFactory=SecretKeyFactory.getInstance("DES");SecretKeylocalSecretKey=localSecretKeyFactory.generateSecret(localDESKeySpec);l=Cipher.getInstance("DES/ECB/PKCS5Padding");l.init(2,localSecretKey);}catch(ThrowablelocalThrowable){returnnull;}}byte[]arrayOfByte=Base64.decodeBase64(paramArrayOfByte);if(arrayOfByte==null){returnnull;}try{returnl.doFinal(arrayOfByte);}catch(ExceptionlocalException){a.error(null,localException);}returnnull;}提取出的代碼放到eclipse中加工后進行測試。這里需要說明的是，需要把兩個文件imc-plat.jar和從網(wǎng)上下載和Cipher加密算法相關的commons-codec-1.8.jar放到jre的相關目錄中，我的是：C:\ProgramFiles\Java\jre7\lib\ext，在運行的時候會有一些奇怪的錯誤，解決方式如圖。可用的java代碼：desjjm.javapackagemon;importjavax.crypto.spec.DESKeySpec;importjavax.crypto.Cipher;importjavax.crypto.SecretKey;importjavax.crypto.SecretKeyFactory;importmons.codec.binary.*;publicclassdesjjm{ privatestaticfinalbyte[]j="liuan814".getBytes();privatestaticCipherk;privatestaticCipherl;//加密算法publicstaticbyte[]encryptData(byte[]paramArrayOfByte){if(k==null){try{DESKeySpeclocalDESKeySpec=newDESKeySpec(j);SecretKeyFactorylocalSecretKeyFactory=SecretKeyFactory.getInstance("DES");SecretKeylocalSecretKey=localSecretKeyFactory.generateSecret(localDESKeySpec);k=Cipher.getInstance("DES/ECB/PKCS5Padding");k.init(1,localSecretKey);}catch(ExceptionlocalException1){returnnull;}}byte[]arrayOfByte=null;try{arrayOfByte=k.doFinal(paramArrayOfByte);}catch(ExceptionlocalException2){//a.error(null,localException2);returnnull;}if(arrayOfByte!=null){returnBase64.encodeBase64(arrayOfByte);}returnnull;}//解密算法publicstaticbyte[]decryptData(byte[]paramArrayOfByte){if(l==null){try{DESKeySpeclocalDESKeySpec=newDESKeySpec(j);SecretKeyFactorylocalSecretKeyFactory=SecretKeyFactory.getInstance("DES");SecretKeylocalSecretKey=localSecretKeyFactory.generateSecret(localDESKeySpec);l=Cipher.getInstance("DES/ECB/PKCS5Padding");l.init(2,localSecretKey);}catch(ThrowablelocalThrowable){returnnull;}}byte[]arrayOfByte=Base64.decodeBase64(paramArrayOfByte);if(arrayOfByte==null){returnnull;}try{returnl.doFinal(arrayOfByte);}catch(ExceptionlocalException){}returnnull;}publicstaticvoidmain(String[]args){ //演示加密算法 Stringmwpass="123456"; byte[]jmpass; jmpass=encryptData(mwpass.getBytes()); Stringdispjmpass; dispjmpass=newString(jmpass); System.out.println(dispjmpass); //演示解密算法 byte[]encryptedpass;//已加密字符串 byte[]realpass;//實際密碼二進制串 StringrealpassStr;//實際密碼字符串 StringencryptedpassStr="4VGeCz4mzZ0="; encryptedpass=encryptedpassStr.getBytes(); realpass=decryptData(encryptedpass); realpassStr=newString(realpass); System.out.println(realpassStr); //Base64算法測試 //加密 Stringstr="45121923";//abc為要加密的字符串 byte[]b=Base64.encodeBase64(str.getBytes()); System.out.println(newString(b)); //解密 str="NDUxMjE5MjM=";//NDUxMjE5MjM=為要解密的字符串 b=Base64.decodeBase64(str.getBytes()); System.out.println(newString(b));}}從網(wǎng)上找到的獨立的DES和BASE64的JAVA實現(xiàn)代碼。DES.javapackagemon;publicclassDES{//聲明常量字節(jié)數(shù)組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};//64privatestaticfinalint[]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};//64privatestaticfinalint[]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};//56privatestaticfinalint[]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};//48privatestaticfinalint[]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};//48privatestaticfinalint[]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};//32privatestaticfinalint[][][]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){//檢測輸入?yún)?shù)格式是否正確，錯誤直接返回空值（null）if((des_key.length!=8)||(des_data.length!=8)||((flag!=1)&&(flag!=0))){thrownewRuntimeException("DataFormatError!");}intflags=flag;//二進制加密密鑰int[]keydata=newint[64];//二進制加密數(shù)據(jù)int[]encryptdata=newint[64];//加密操作完成后的字節(jié)數(shù)組byte[]EncryptCode=newbyte[8];//密鑰初試化成二維數(shù)組int[][]KeyArray=newint[16][48];//將密鑰字節(jié)數(shù)組轉換成二進制字節(jié)數(shù)組keydata=ReadDataToBirnaryIntArray(des_key);//將加密數(shù)據(jù)字節(jié)數(shù)組轉換成二進制字節(jié)數(shù)組encryptdata=ReadDataToBirnaryIntArray(des_data);//初試化密鑰為二維密鑰數(shù)組KeyInitialize(keydata,KeyArray);//執(zhí)行加密解密操作EncryptCode=Encrypt(encryptdata,flags,KeyArray);returnEncryptCode;}//初試化密鑰數(shù)組privatevoidKeyInitialize(int[]key,int[][]keyarray){inti;intj;int[]K0=newint[56];//特別注意：xxx[IP[i]-1]等類似變換for(i=0;i<56;i++){K0[i]=key[PC_1[i]-1];//密鑰進行PC-1變換}for(i=0;i<16;i++){LeftBitMove(K0,LeftMove[i]);//特別注意：xxx[IP[i]-1]等類似變換for(j=0;j<48;j++){keyarray[i][j]=K0[PC_2[j]-1];//生成子密鑰keyarray[i][j]}}}//執(zhí)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];//特別注意：xxx[IP[i]-1]等類似變換for(i=0;i<64;i++){M[i]=timeData[IP[i]-1];//明文IP變換}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];//進行IP-1運算}GetEncryptResultOfByteArray(MIP_1,encrypt);//返回加密數(shù)據(jù)returnencrypt;}privateint[]ReadDataToBirnaryIntArray(byte[]intdata){inti;intj;//將數(shù)據(jù)轉換為二進制數(shù)，存儲到數(shù)組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;//循環(huán)移位操作函數(shù)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++){//循環(huán)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++){//循環(huán)左移兩位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];//明文左側的初始化R0[i]=M[i+32];//明文右側的初始化}for(i=0;i<48;i++){RE[i]=R0[E[i]-1];//經(jīng)過E變換擴充，由32位變?yōu)?8位RE[i]=RE[i]+keyarray[times][i];//與KeyArray[times][i]按位作不進位加法運算if(RE[i]==2){RE[i]=0;}}for(i=0;i<8;i++){//48位分成8組for(j=0;j<6;j++){S[i][j]=RE[(i*6)+j];}//下面經(jīng)過S盒，得到8個數(shù)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個數(shù)變換輸出二進制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];//經(jīng)過P變換L1[i]=R0[i];//右邊移到左邊R1[i]=L0[i]+RP[i];if(R1[i]==2){R1[i]=0;}//重新合成M，返回數(shù)組M//最后一次變換時，左右不進行互換。此處采用兩次變換實現(xiàn)不變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;//將存儲64位二進制數(shù)據(jù)的數(shù)組中的數(shù)據(jù)轉換為八個整數(shù)（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;if(len%8!=0){ newlen=len+padlen;}else{ newlen=len;}byte[]newdata=newbyte[newlen];System.arraycopy(data,0,newdata,0,len);for(inti=len;i<newlen;i++)newdata[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;i<unitcount;i++){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);byte[]tmpresult=UnitDes(tmpkey,tmpdata,flag);System.arraycopy(tmpresult,0,result_data,i*8,8);}returnresult_data;}publicstaticvoidmain(String[]args){Stringkey="liuan814";Stringdata="123456";intbytelen=data.getBytes().length;byte[]result=newbyte[(bytelen/8)*8+(bytelen%8)];byte[]bytekey=key.getBytes();byte[]bytedata=data.getBytes();System.out.println(data);DESdes=newDES();result=des.DesEncrypt(bytekey,bytedata,1);for(inti=0;i<result.length;i++){System.out.print(String.format("%x",result[i]));}System.out.println();result=des.DesEncrypt(bytekey,result,0);for(inti=0;i<result.length;i++){ if(result[i]<32||result[i]>127) { result[i]='\0'; }}Stringoutstr;outstr=newString(result);System.out.println(outstr.substring(0,outstr.indexOf("\0")));}}BASESF.javapackagemon;publicclassBase64SF{privatestaticfinalbyte[]encodingTable={(byte)'A',(byte)'B',(byte)'C',(byte)'D',(byte)'E',(byte)'F',(byte)'G',(byte)'H',(byte)'I',(byte)'J',(byte)'K',(byte)'L',(byte)'M',(byte)'N',(byte)'O',(byte)'P',(byte)'Q',(byte)'R',(byte)'S',(byte)'T',(byte)'U',(byte)'V',(byte)'W',(byte)'X',(byte)'Y',(byte)'Z',(byte)'a',(byte)'b',(byte)'c',(byte)'d',(byte)'e',(byte)'f',(byte)'g',(byte)'h',(byte)'i',(byte)'j',(byte)'k',(byte)'l',(byte)'m',(byte)'n',(byte)'o',(byte)'p',(byte)'q',(byte)'r',(byte)'s',(byte)'t',(byte)'u',(byte)'v',(byte)'w',(byte)'x',(byte)'y',(byte)'z',(byte)'0',(byte)'1',(byte)'2',(byte)'3',(byte)'4',(byte)'5',(byte)'6',(byte)'7',(byte)'8',(byte)'9',(byte)'+',(byte)'/'};privatestaticfinalbyte[]decodingTable;static{decodingTable=newbyte[128];for(inti=0;i<128;i++){decodingTable[i]=(byte)-1;}for(inti='A';i<='Z';i++){decodingTable[i]=(byte)(i-'A');}for(inti='a';i<='z';i++){decodingTable[i]=(byte)(i-'a'+26);}for(inti='0';i<='9';i++){decodingTable[i]=(byte)(i-'0'+52);}decodingTable['+']=62;decodingTable['/']=63;}publicstaticbyte[]encode(byte[]data){byte[]bytes;intmodulus=data.length%3;if(modulus==0){bytes=newbyte[(4*data.length)/3];}else{bytes=newbyte[4*((data.length/3)+1)];}intdataLength=(data.length-modulus);inta1;inta2;inta3;for(inti=0,j=0;i<dataLength;i+=3,j+=4){a1=data[i]&0xff;a2=data[i+1]&0xff;a3=data[i+2]&0xff;bytes[j]=encodingTable[(a1>>>2)&0x3f];bytes[j+1]=encodingTable[((a1<<4)|(a2>>>4))&0x3f];bytes[j+2]=encodingTable[((a2<<2)|(a3>>>6))&0x3f];bytes[j+3]=encodingTable[a3&0x3f];}intb1;intb2;intb3;intd1;intd2;switch(modulus){case0:/*nothinglefttodo*/break;case1:d1=data[data.length-1]&0xff;b1=(d1>>>2)&0x3f;b2=(d1<<4)&0x3f;bytes[bytes.length-4]=encodingTable[b1];bytes[bytes.length-3]=encodingTable[b2];bytes[bytes.length-2]=(byte)'=';bytes[bytes.length-1]=(byte)'=';break;case2:d1=data[data.length-2]&0xff;d2=data[data.length-1]&0xff;b1=(d1>>>2)&0x3f;b2=((d1<<4)|(d2>>>4))&0x3f;b3=(d2<<2)&0x3f;bytes[bytes.length-4]=encodingTable[b1];bytes[bytes.length-3]=encodingTable[b2];bytes[bytes.length-2]=encodingTable[b3];bytes[bytes.length-1]=(byte)'=';break;}returnbytes;}publicstaticbyte[]decode(byte[]data){byte[]bytes;byteb1;byteb2;byteb3;byteb4;data=discardNonBase64Bytes(data);if(data[data.length-2]=='='){bytes=newbyte[(((data.length/4)-1)*3)+1];}elseif(data[data.length-1]=='='){bytes=newbyte[(((data.length/4)-1)*3)+2];}else{bytes=newbyte[((data.length/4)*3)];}for(inti=0,j=0;i<(data.length-4);i+=4,j+=3){b1=decodingTable[data[i]];b2=decodingTable[data[i+1]];b3=decodingTable[data[i+2]];b4=decodingTable[data[i+3]];bytes[j]=(byte)((b1<<2)|(b2>>4));bytes[j+1]=(byte)((b2<<4)|(b3>>2));bytes[j+2]=(byte)((b3<<6)|b4);}if(data[data.length-2]=='='){b1=decodingTable[data[data.length-4]];b2=decodingTable[data[data.length-3]];bytes[bytes.length-1]=(byte)((b1<<2)|(b2>>4));}elseif(data[data.length-1]=='='){b1=decodingTable[data[data.length-4]];b2=decodingTable[data[data.length-3]];b3=decodingTable[data[data.length-2]];bytes[bytes.length-2]=(byte)((b1<<2)|(b2>>4));bytes[bytes.length-1]=(byte)((b2<<4)|(b3>>2));}else{b1=decodingTable[data[data.length-4]];b2=decodingTable[data[data.length-3]];b3=decodingTable[data[data.length-2]];b4=decodingTable[data[data.length-1]];bytes[bytes.length-3]=(byte)((b1<<2)|(b2>>4));bytes[bytes.length-2]=(byte)((b2<<4)|(b3>>2));bytes[bytes.length-1]=(byte)((b3<<6)|b4);}returnbytes;}publicstaticbyte[]decode(Stringdata){byte[]bytes;byteb1;byteb2;byteb3;byteb4;data=discardNonBase64Chars(data);if(data.charAt(data.length()-2)=='='){bytes=newbyte[(((data.length()/4)-1)*3)+1];}elseif(data.charAt(data.length()-1)=='='){bytes=newbyte[(((data.length()/4)-1)*3)+2];}else{bytes=newbyte[((data.length()/4)*3)];}for(inti=0,j=0;i<(data.length()-4);i+=4,j+=3){b1=decodingTable[data.charAt(i)];b2=decodingTable[data.charAt(i+1)];b3=decodingTable[data.charAt(i+2)];b4=decodingTable[data.charAt(i+3)];bytes[j]=(byte)((b1<<2)|(b2>>4));bytes[j+1]=(byte)((b2<<4)|(b3>>2));bytes[j+2]=(byte)((b3<<6)|b4);}if(data.charAt(data.length()-2)=='='){b1=decodingTable[data.charAt(data.length()-4)];b2=decodingTable[data.charAt(data.length()-3)];bytes[bytes.length-1]=(byte)((b1<<2)|(b2>>4));}elseif(data.charAt(data.length()-1)=='='){b1=decodingTable[data.charAt(data.length()-4)];b2=decodingTable[data.charAt(data.length()-3)];b3=decodingTable[data.charAt(data.length()-2)];bytes[bytes.length-2]=(byte)((b1<<2)|(b2>>4));bytes[bytes.length-1]=(byte)((b2<<4)|(b3>>2));}else{b1=decodingTable[data.charAt(data.length()-4)];b2=decodingTable[data.charAt(data.length()-3)];b3=decodingTable[data.charAt(data.length()-2)];b4=decodingTable[data.charAt(data.length()-1)];bytes[bytes.length-3]=(byte)((b1<<2)|(b2>>4));bytes[bytes.length-2]=(byte)((b2<<4)|(b3>>2));bytes[bytes.length-1]=(byte)((b3<<6)|b4);}returnbytes;}privatestaticbyte[]discardNonBase64Bytes(byte[]data){byte[]temp=newbyte[data.length];intbytesCopied=0;for(inti=0;i<data.length;i++){if(isValidBase64Byte(data[i])){temp[bytesCopied++]=data[i];}}byte[]newData=newbyte[bytesCopied];System.arraycopy(temp,0,newData,0,bytesCopied);returnnewData;}privatestaticStringdiscardNonBase64Chars(Stringdata){StringBuffersb=newStringBuffer();intlength=data.length();for(inti=0;i<length;i++){if(isValidBase64Byte((byte)(data.charAt(i)))){sb.append(data.charAt(i));}}returnsb.toString();}privatestaticbooleanisValidBase64Byte(byteb){if(b=='='){returntrue;}elseif((b<0)||(b>=128)){returnfalse;}elseif(decodingTable[b]==-1){returnfalse;}returntrue;}publicstaticvoidmain(String[]args){Stringdata="123456";byte[]result=Base64SF.encode(data.getBytes());System.out.println(data);System.out.println(newString(result));System.out.println(newString(Base64SF.decode(newString(result))));}}把兩個合起來的mydes.javapackagemon;publicclassmydes{ privatestaticStringgenpass(Stringkey,Stringdata) { byte[]base64result; intbytelen=data.getBytes().length; byte[]result=newbyte[(bytelen/8)*8+(bytelen%8)]; byte[]bytekey=key.getBytes(); byte[]bytedata=data.getBytes(); DESdes=newDES(); result=des.DesEncrypt(bytekey,bytedata,1); base64result=Base64SF.encode(result); return(newString(base64result)); }privatestaticStringdepass(Stringkey,Stringdata){ intbytelen=data.getBytes().length; byte[]result=newbyte[(bytelen/8)*8+(bytelen%8)]; byte[]bytekey=key.getBytes(); DESdes=newDES();result=Base64SF.decode(data);result=des.DesEncrypt(bytekey,result,0);for(inti=0;i<result.length;i++){ if(result[i]<32||result[i]>127) { result[i]='\0'; }} Stringoutstr; outstr=newString(result); returnoutstr.substring(0,outstr.indexOf("\0"));} publicstaticvoidmain(String[]args){ Stringkey="liuan814";Stringda