Can Any One Tell me what's the purporse of this RSA function?

本文介绍了一种将RSA私钥中的各个组成部分转换为字节数组的方法。该方法首先计算密钥长度,然后根据需要创建不同大小的字节数组来容纳模数、私钥指数等关键数据。通过对比原始数据与目标数组的长度,确保数据能够正确填充到新的字节数组中。

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None.gif     static   byte [][] a(RSAPrivateCrtKey rsaprivatecrtkey)
ExpandedBlockStart.gifContractedBlock.gif    
dot.gif {
InBlock.gif        
byte  abyte0[][];
InBlock.gif        
int  i1;
InBlock.gif        
int  k1;
InBlock.gif        abyte0 
=   new   byte [ 8 ][ 0 ];
InBlock.gif        i1 
=  (i1  =  rsaprivatecrtkey.getModulus().bitLength())  +  (i1  &   1 );
InBlock.gif        Object obj 
=   null ;
InBlock.gif        
boolean  flag  =   false ;
InBlock.gif        k1 
=  i1  >>   3 ;
InBlock.gif        abyte0[
0 =   new   byte [k1];
InBlock.gif        
byte  abyte1[];
InBlock.gif        
int  j1;
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getModulus().toByteArray()).length)  !=  k1  +   1 goto  _L2;  else   goto  _L1
InBlock.gif_L1:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
0 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L3
InBlock.gif_L2:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
0 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L3:
InBlock.gif        System.arraycopy();
InBlock.gif        abyte0[
1 =   new   byte [k1];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getPrivateExponent().toByteArray()).length)  !=  k1  +   1 goto  _L5;  else   goto  _L4
InBlock.gif_L4:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
1 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L6
InBlock.gif_L5:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
1 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L6:
InBlock.gif        System.arraycopy();
InBlock.gif        k1 
=  i1  >>   4 ;
InBlock.gif        abyte0[
2 =   new   byte [k1];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getCrtCoefficient().toByteArray()).length)  !=  k1  +   1 goto  _L8;  else   goto  _L7
InBlock.gif_L7:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
2 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L9
InBlock.gif_L8:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
2 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L9:
InBlock.gif        System.arraycopy();
InBlock.gif        abyte0[
3 =   new   byte [k1];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getPrimeExponentP().toByteArray()).length)  !=  k1  +   1 goto  _L11;  else   goto  _L10
InBlock.gif_L10:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
3 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L12
InBlock.gif_L11:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
3 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L12:
InBlock.gif        System.arraycopy();
InBlock.gif        abyte0[
4 =   new   byte [k1];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getPrimeExponentQ().toByteArray()).length)  !=  k1  +   1 goto  _L14;  else   goto  _L13
InBlock.gif_L13:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
4 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L15
InBlock.gif_L14:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
4 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L15:
InBlock.gif        System.arraycopy();
InBlock.gif        abyte0[
5 =   new   byte [k1];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getPrimeP().toByteArray()).length)  !=  k1  +   1 goto  _L17;  else   goto  _L16
InBlock.gif_L16:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
5 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L18
InBlock.gif_L17:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
5 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L18:
InBlock.gif        System.arraycopy();
InBlock.gif        abyte0[
6 =   new   byte [k1];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getPrimeQ().toByteArray()).length)  !=  k1  +   1 goto  _L20;  else   goto  _L19
InBlock.gif_L19:
InBlock.gif        abyte1;
InBlock.gif        
true ;
InBlock.gif        abyte0[
6 ];
InBlock.gif        
0 ;
InBlock.gif        k1;
InBlock.gif          
goto  _L21
InBlock.gif_L20:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
6 ];
InBlock.gif        k1 
-  j1;
InBlock.gif        j1;
InBlock.gif_L21:
InBlock.gif        System.arraycopy();
InBlock.gif        abyte0[
7 =   new   byte [ 4 ];
InBlock.gif        
if ((j1  =  (abyte1  =  rsaprivatecrtkey.getPublicExponent().toByteArray()).length)  <=   4 goto  _L23;  else   goto  _L22
InBlock.gif_L22:
InBlock.gif        abyte1;
InBlock.gif        
false ;
InBlock.gif        abyte0[
7 ];
InBlock.gif        
0 ;
InBlock.gif        
4 ;
InBlock.gif          
goto  _L24
InBlock.gif_L23:
InBlock.gif        abyte1;
InBlock.gif        
0 ;
InBlock.gif        abyte0[
7 ];
InBlock.gif        
4   -  j1;
InBlock.gif        j1;
InBlock.gif_L24:
InBlock.gif        System.arraycopy();
InBlock.gif        
return  abyte0;
ExpandedBlockEnd.gif    }
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