请教java和c++高手，帮忙翻译一个加密算法

Question

算法如下，是用c++写的，现在我java程序中要用到，哪位大侠能帮忙翻译一下，谢谢了char *EncryptPwd(p_sPasswd)char *p_sPasswd;/*char *p_sPasswd[C_PASSWD_LEN];*/{         char c;         int i;         int iLength;         const int iMove = 5; /*后移位数*/         char cBegin = ' '; /* ASCII 32*/         char cEnd = '~';  /*ASCII 126*/         char p_sPasswdtemp[81];         char *sReturn ; /*字符转换为16进制*/         char p_sChar0x[3]; /*字符的16进制*/         char p_sRand[5]; /*4位随机数*/         const int iBase = 127 ; /* 01111111 用于异或转换*/          sReturn=(char*)malloc(200);         memset(sReturn,0,200);         iLength = strlen(p_sPasswd);                  printf("%d\n",iLength);                printf("%s\n",p_sPasswd);                  /* 保存16进制*/         /*strcpy(sReturn , "");*/         for (i=0; i<iLength; i++)         {                   c = p_sPasswd[i];                   c = c ^ iBase;                   sprintf(p_sChar0x, "%02x", c);                   strcat(sReturn, p_sChar0x );         }                                   printf("%s\n",sReturn);                        /* 后移 iMove 5 位*/                     strcpy(p_sPasswdtemp , sReturn);         iLength = strlen(p_sPasswdtemp);                    printf("%d\n",iLength);         printf("%s\n",p_sPasswdtemp);                  if(iLength>0)         {                    strncpy(sReturn,p_sPasswdtemp+iMove,iLength-iMove);                   strncpy(sReturn+iLength-iMove,p_sPasswdtemp,iMove);                   printf("%s\n",sReturn);                                            /* 奇偶互换                   for (i=0; i<(iLength/2); i++)                   {                            c = sReturn[2*i];                            sReturn[2*i]=sReturn[2*i+1];                            sReturn[2*i+1]=c;                   }                           printf("%s\n",sReturn);                         */                   /* 加入随机数*/                   srand( (unsigned)time( NULL ) );                   sprintf(p_sRand, "%04x", rand());                   strcpy(p_sPasswdtemp , sReturn);                   iLength = strlen(p_sPasswdtemp);                   printf("%d\n",iLength);                   printf("%s\n",p_sPasswdtemp);                            strncpy(sReturn, p_sRand,4 );                   strncpy(sReturn+4, p_sPasswdtemp,3 );                   sprintf(p_sRand, "%04x", rand());                   strncpy(sReturn+7, p_sRand,4 );                   strncpy(sReturn+11, p_sPasswdtemp+3,iLength-3 );                   sprintf(p_sRand, "%04x", rand());                   p_sRand[4]=0;                   strncpy(sReturn+8+iLength, p_sRand,5 ); /*含'\0'*/                                      printf("%s\n",sReturn);               }                  iLength = strlen(sReturn);         printf("%d\n",iLength);                  return sReturn;}

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【beipanjiyi】截止到2008-07-09 16:04:33的历史汇总数据(不包括此帖)：
发帖的总数量:3                        发帖的总分数:300                      每贴平均分数:100                      
回帖的总数量:0                        得分贴总数量:0                        回帖的得分率:0%                       
结贴的总数量:2                        结贴的总分数:200                      
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:1                        未结的总分数:100                      
结贴的百分比:66.67 %               结分的百分比:66.67 %                  
无满意结贴率:0.00  %               无满意结分率:0.00  %                  
楼主加油

Answer 2

lz的意思是给代码注释一遍？或是要写成dll供java调用？还是用java重写此方法？

Answer 3

最好是用java重写此方法，这是一个纯java的web项目

Answer 4

} private final byte hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'B', 'C', 'D', 'E', 'F' }; public String EncryptPwd(byte[] p_sPasswd) {
byte c;
int i;
int iLength;
final int iMove = 5; /* 后移位数 */
byte p_sPasswdtemp[] = new byte[81];
ByteBuffer sReturn; /* 字符转换为16进制 */
byte p_sRand[] = new byte[5]; /* 4位随机数 */
final byte iBase = 127; /* 01111111 用于异或转换 */
sReturn = ByteBuffer.allocate(200);// sReturn=(char*)malloc(200);//分配内存单元
// memset(sReturn,0,200); //内存单元的初始化,都置为0
iLength = p_sPasswd.length;
System.out.println(iLength);// printf("%d\n",iLength);
System.out.println(p_sPasswd);// printf("%s\n",p_sPasswd);
/* 保存16进制 */ /* strcpy(sReturn , ""); */
for (i = 0; i < iLength; i++) {
c = p_sPasswd[i];
c = (byte) (c ^ iBase); // sprintf(p_sChar0x, "%02x", c);
// strcat(sReturn, p_sChar0x );
byte h = hex[(c & 0xF0) >> 4];
sReturn.put(h);
System.out.print(h);
h = hex[(c & 0x0F)];
sReturn.put(h);
System.out.print(h);
} System.out.println(sReturn);// printf("%s\n",sReturn); /* 后移 iMove 5 位 */ System.arraycopy(sReturn.array(), 0, p_sPasswdtemp, 0, sReturn
.arrayOffset());// strcpy(p_sPasswdtemp , sReturn);
iLength = sReturn.arrayOffset(); System.out.println(iLength);// printf("%d\n",iLength); System.out.println(p_sPasswdtemp);// printf("%s\n",p_sPasswdtemp); if (iLength > 0) {
System.arraycopy(p_sPasswdtemp, iMove, sReturn.array(), 0, iLength
- iMove);// strncpy(sReturn,p_sPasswdtemp+iMove,iLength-iMove);
System.arraycopy(sReturn.array(), iLength - iMove, p_sPasswdtemp,
0, iMove);// strncpy(sReturn+iLength-iMove,p_sPasswdtemp,iMove); System.out.println(new String(sReturn.array()));// printf("%s\n",sReturn); /*
 * 奇偶互换
 * 
 * for (i=0; i <(iLength/2); i++) {
 * 
 * c = sReturn[2*i];
 * 
 * sReturn[2*i]=sReturn[2*i+1];
 * 
 * sReturn[2*i+1]=c; }
 * 
 * printf("%s\n",sReturn);
 * 
 */ /* 加入随机数 */ Random rand = new Random(System.currentTimeMillis());// srand(
// (unsigned)time(
// NULL ) ); // sprintf(p_sRand, "%04x", rand());
byte r[] = new byte[4];
rand.nextBytes(r);
for (int t = 0; t < r.length; t++) {
p_sRand[t] = hex[r[i]];
} System.arraycopy(sReturn.array(), 0, p_sPasswdtemp, 0, sReturn
.arrayOffset());// strcpy(p_sPasswdtemp , sReturn); iLength = sReturn.arrayOffset(); System.out.println(iLength);// printf("%d\n",iLength); System.out.println(p_sPasswdtemp);// printf("%s\n",p_sPasswdtemp); System.arraycopy(p_sRand, 0, sReturn.array(), 0, 4);// strncpy(sReturn,p_sRand,4 ); System.arraycopy(p_sPasswdtemp, 0, sReturn.array(), 4, 3);// strncpy(sReturn+4, p_sPasswdtemp,3); // sprintf(p_sRand, "%04x", rand());
rand.nextBytes(r);
for (int t = 0; t < r.length; t++) {
p_sRand[t] = hex[r[i]];
} System.arraycopy(p_sRand, 0, sReturn.array(), 7, 4);// strncpy(sReturn+7,
// p_sRand,4 ); System
.arraycopy(p_sPasswdtemp, 3, sReturn.array(), 11,
iLength - 3);// strncpy(sReturn+11,
// p_sPasswdtemp+3,iLength-3 ); // sprintf(p_sRand, "%04x", rand());
rand.nextBytes(r);
for (int t = 0; t < r.length; t++) {
p_sRand[t] = hex[r[i]];
} p_sRand[4] = 0; System.arraycopy(p_sRand, 0, sReturn.array(), 8 + iLength, 5);// strncpy(sReturn+8+iLength,p_sRand,5);
// /*
// 含'\0'
// */ System.out.println(new String(sReturn.array()));// printf("%s\n",sReturn);
} String rStr = new String(sReturn.array());
iLength = rStr.length(); System.out.println(iLength);// printf("%d\n",iLength); return rStr; }

Answer 5

5楼的写的很详细，只是我的进制学的差一点，没怎么看懂，不过还是很感谢，下面是我的代码：public class PswUtil {

public static String EncryptPwd(String sPasswd){
    final int iBase = 127 ; /* 01111111 用于异或转换*/ 
    final int iMove = 5; /*后移位数*/ 
    int i;
    char c;     String p_sRand = new String(); /*4位随机数*/ 
    String sReturn = new String(); /*字符转换为16进制*/ 
    String p_sPasswdtemp = new String();    
    /*保存16进制*/
     for(i = 0; i < sPasswd.length(); i++) 
    {
      String tmp0x = new String();
      c = sPasswd.charAt(i);
      c = (char)((int)c ^ iBase); 
      tmp0x = Integer.toHexString((int)c);
      if(tmp0x.length()==1) tmp0x="0"+tmp0x;
      sReturn = sReturn + tmp0x;
    }                
   
    /* 后移 iMove 5 位*/  
    p_sPasswdtemp = sReturn;  
    
    if(p_sPasswdtemp.length()>0) 
    {
      sReturn = p_sPasswdtemp.substring(iMove, p_sPasswdtemp.length());
      sReturn = sReturn + p_sPasswdtemp.substring(0, iMove);

            

      /* 加入随机数*/
      /* C语言在取随机数时需要先设置随机种子
          time(NULL)返回的是1970.1.1到当前时间的秒数
          srand((unsigned)time(NULL));
       */
      p_sRand = Integer.toHexString((int)(Math.random()*10000));/*我在这里暂时取4位随机数*/
      if(p_sRand.length()!=4){
       int length = 4-p_sRand.length();
       for(int m=0;m<length;m++){
       p_sRand="0"+p_sRand;
       }
      }
      
       p_sPasswdtemp = sReturn;       

      char tmpReturn[];
      tmpReturn = new char[4];

      for(i = 0; i < 4; i++){
       tmpReturn[i] = p_sRand.charAt(i);
      }

      String tmp_sReturn1 = new String(tmpReturn);

      sReturn = tmp_sReturn1;
      sReturn = sReturn + p_sPasswdtemp.substring(0, 3);
      p_sRand = Integer.toHexString((int)(Math.random()*10000));//我在这里暂时取4位随机数
      if(p_sRand.length()!=4){
       int length = 4-p_sRand.length();
       for(int m=0;m<length;m++){
       p_sRand="0"+p_sRand;
       }
             }
      
       for(i = 0; i < 4; i++){
        tmpReturn[i] = p_sRand.charAt(i);
       }

      String tmp_sReturn2 = new String(tmpReturn);

      sReturn = sReturn + tmp_sReturn2;
      sReturn = sReturn + p_sPasswdtemp.substring(3,p_sPasswdtemp.length());
      p_sRand = Integer.toHexString((int)(Math.random()*10000));//我在这里暂时取4位随机数
      
      if(p_sRand.length()!=4){
       int length = 4-p_sRand.length();
       for(int m=0;m<length;m++){
       p_sRand="0"+p_sRand;
       }
              }

       for(i = 0; i < 4; i++){
        tmpReturn[i] = p_sRand.charAt(i);
       }

      String tmp_sReturn3 = new String(tmpReturn);
      sReturn = sReturn + tmp_sReturn3;
      
    }    
    
    System.out.println("sReturn:"+sReturn);     return sReturn;
  }

  /**
   * @param args
   */
  public static void main(String[] args) {
    String sNewPwd = new String();
    sNewPwd = EncryptPwd("222222");
  }