python - Add 1 bit to a string -

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I'm looking for a path to add "1" for the message in Python, so that the MD5 algorithm Mentioned.

I did this, but the problem is that msg is actually a string: 

  msg.append (0x01)   
 What should I do?  
 
 
 
 use  chr  to convert the byte value to string. Then you can add them to  msg .  
  msg + = chr (0x01 & lt; 8) while len (msg)% 56! = 0: msg + = Chr (0x00)   
 In Python 2.7, the letters 8 bits are large in each ASCII string. So with this method, you are not really adding "1 bit" every time, this is the reason that the left shift is required to do 1 times eight times otherwise you can change the  0b10000000  instead of  0b00000001 < / Code> in the string.

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