问题描述
接触java时间不长，根据书上和网上的DES加密/解密原理自己编写了加密/解密算法，可是不管怎么运行加密和解密的结果都是乱码，但是输入的明文里没有中文，全是英文字符。自己检查了好几遍也不知道是哪里出了问题，头都大了，请大家帮我找找毛病。谢谢！！publicclassDetails{publicstaticintgetSourceBitArrayLength(Stringsource){intlength=source.length();returnlength/8+(length%8==0?0:1);}publicstaticString[]getSubstringArray(Stringsource,intlength){String[]substring=newString[length];intlettersLeft=source.length();intlow=0,high=8;for(inti=0;i<length;++i){if(lettersLeft<8){substring[i]=source.substring(low,source.length());StringBuilderbd=newStringBuilder();for(intj=0;j<8-lettersLeft;++j)bd.append('');substring[i]+=bd.toString();break;}substring[i]=source.substring(low,high);low=high;high+=8;lettersLeft-=8;}returnsubstring;}//Byte类型转为bit类型publicstaticint[]bytesToBits(Stringsource){int[]bits=newint[64];charelement=0;for(inti=0;i<64;++i){for(intj=0;j<8;++j){element=source.charAt(j);for(intk=0;k<8;++k)bits[8*(j+1)-k-1]=(element>>k)&1;}}returnbits;}//bit类型转为Byte类型publicstaticbyte[]bitsToBytes(int[]bits){byteelement[]=newbyte[]{0,0,0,0,0,0,0,0};intj=0,k=0;for(inti=0;i<64;++i){if(k==8){j++;k=0;}element[j]|=bits[i]<<(8-(k++)-1);}returnelement;}//初始IP置换publicstaticvoidinitialPermutation(int[]bits){int[]newBits=newint[64];for(inti=0;i<64;++i)newBits[i]=bits[Table.getIP()[i]-1];bits=newBits;}//获取子密钥publicstaticint[][]getSubkeys(int[]key){int[][]subkey=newint[16][48];int[]tempKey=newint[56];int[]C=newint[28];int[]D=newint[28];for(inti=0;i<56;++i){tempKey[i]=key[Table.getPC_1()[i]-1];if(i<28)C[i]=tempKey[i];elseD[i%28]=tempKey[i];}for(inti=0;i<16;++i){leftShift(Table.getShift()[i],C);leftShift(Table.getShift()[i],D);intindex=0;for(;index<28;++index)tempKey[index]=C[index];for(;index<56;++index)tempKey[index]=D[index%28];for(intj=0;j<48;++j)subkey[i][j]=tempKey[Table.getPC_2()[j]-1];}returnsubkey;}//左移privatestaticvoidleftShift(intindex,int[]key){int[]temp=newint[index];for(inti=0;i<index;++i)temp[i]=key[i];for(inti=index;i<key.length;++i)key[i-index]=key[i];for(inti=0;i<index;++i)key[key.length-i-1]=temp[index-i-1];}//扩展置换privatestaticint[]expansionPermutation(int[]R){int[]newR=newint[48];for(inti=0;i<48;++i)newR[i]=R[Table.getE()[i]-1];returnnewR;}//扩展置换结果与Ki进行异或运算privatestaticvoidRxorKey(int[]R,int[]key){for(inti=0;i<48;++i)R[i]^=key[i];}//S盒置换privatestaticint[]sBoxConversion(int[]R,int[]L){int[]newL=newint[32];int[][]splitedR=newint[8][6];intb1=0,b0=0,index=0;intcount=0;int[]b=newint[4];int[]bits=newint[4];for(inti=0;i<8;++i){for(intj=0;j<6;++j){splitedR[i][j]=R[index++];}}for(inti=0;i<8;++i){for(intj=0,k=0;j<6;++j){if(j==0)b0=splitedR[i][j];elseif(j==5)b1=splitedR[i][j];elseb[k++]=splitedR[i][j];}introw=b0*2+b1;intcolumn=0;for(inte=0;e<4;++e)column+=b[e]*Math.pow(2,4-e-1);intresult=Table.getS()[i][row][column];for(inte=0;e<4;++e)bits[4-e-1]=(result>>e)&1;for(inte=0;e<4;++e)newL[count++]=bits[e];}pBoxConversion(newL);for(inti=0;i<32;++i)newL[i]^=L[i];returnnewL;}//P盒置换privatestaticvoidpBoxConversion(int[]newL){int[]temp=newint[32];for(inti=0;i<32;++i)temp[i]=newL[Table.getP()[i]-1];newL=temp;}//IP_1置换publicstaticint[]finalPermutation(int[]L,int[]R){int[]bits=newint[64];intindex=0;int[]codeBits=newint[64];for(inti=0;i<32;++i)bits[index++]=L[i];for(inti=0;i<32;++i)bits[index++]=R[i];for(inti=0;i<64;++i)codeBits[i]=bits[Table.getIP_1()[i]-1];returncodeBits;}publicstaticint[]encryption(int[]R,int[]L,int[]key){int[]newR=expansionPermutation(R);RxorKey(newR,key);returnsBoxConversion(newR,L);}}
下面是具体加密的函数：source=jtaSource.getText();length=Details.getSourceBitArrayLength(source);substring=Details.getSubstringArray(source,length);sourceBits=newint[length][64];codeBits=newint[length][64];for(inti=0;i<length;++i)sourceBits[i]=Details.bytesToBits(substring[i]);StringkeyString=jtfKey.getText();intkeyLength=keyString.length();if(keyLength<8){StringBuilderbd=newStringBuilder(keyString);for(inti=0;i<8-keyLength;++i)bd.append('');keyString=bd.toString();}if(keyLength>8)keyString=keyString.substring(0,8);subkey=Details.getSubkeys(Details.bytesToBits(keyString));for(inti=0;i<length;++i){Details.initialPermutation(sourceBits[i]);int[]L=newint[32];int[]R=newint[32];for(intj=0;j<64;++j){if(j<32)L[j]=sourceBits[i][j];elseR[j%32]=sourceBits[i][j];}for(intj=0;j<16;++j){int[]tempL=newint[32];int[]tempR=newint[32];for(intk=0;k<32;++k){tempL[k]=L[k];tempR[k]=R[k];}if(j<15){R=Details.encryption(R,L,subkey[j]);L=tempR;}else{L=Details.encryption(R,L,subkey[j]);R=tempR;}}codeBits[i]=Details.finalPermutation(L,R);}StringBuildertbd=newStringBuilder();for(inti=0;i<length;++i){codeByte=Details.bitsToBytes(codeBits[i]);for(intj=0;j<8;++j)tbd.append((char)codeByte[j]);}jtaCode.setText(tbd.toString());
置换表网上都有，就不贴了。谢谢！！
解决方案
解决方案二：
有人吗？能帮我看看吗？
解决方案三：
亲，你把你所有涉及到字符集（即编码）都认真对一遍，看看是否统一！