Problem of encrypt openssl RC4 Post: 303024672

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Top Forums Shell Programming and Scripting Problem of encrypt openssl RC4 Post 303024672 by Xremix30 on Sunday 14th of October 2018 12:56:31 PM

10-14-2018

Registered User

Problem of encrypt openssl with cypher RC4

Hi Guys sorry about post the code in portuguese but now i fix almost parts of code. now i can encryped and decryped the files but have a small problem. When not writte nathing generate automatically a random cypher but after the value of this cypher not appear igual than variable $saved_key. And used this value modifacate for decrypt file and i can see nathing because not use the correct cypher. How can fix this?

This my code modificate;

Code:

 

file_key="cypher.txt"
saved_key=$(cat cypher.txt)

menu_Start(){
clear_screen
echo ---------------------------------------------------
echo                  Manufactory RC4 OpenSSL
echo ---------------------------------------------------
echo ""
echo 1 - RC4 little used
echo Insert the cypher most be used:

read option_menu

case $option_menu in
1) menu;;
esac

}


menu(){
clear_screen

echo "REVERSE CRYPTO 4"
echo ""
echo "1 -> Encrypt"
echo "2 -> Decrypt"
echo "3 -> go back last menu"
echo "Choise the number of options:"

read option

case $option in
0);;	
1) encrypt_RC4 ;;
2) decrypt_RC4 ;;
esac
}

encrypt_RC4() {
clear_screen

name="RC4"
echo -n "Insert the cypher hex that you want created:"; read CYPHER
echo $CYPHER > $file_key

# Problem in this part when generated the cypher

if [[ -z "$CYPHER" ]]; then
echo $(openssl rand -hex 8) > $file_key # generated the cypher principal ex: abcdc34ba
fi
#--------------------------------------------------------------------------------------------------------
cat $file_key

echo -n "Insert the name of file for encrypted:"; read IN_FILE   
echo -n "Insert the name of file for out:"; read OUT_FILE
if [[ -z "$IN_FILE" ]]; then
   echo "The file was cypher"	
fi

case $option_menu in
1) algorithm_encryptRC4 ;;
esac

echo "The cypher used is: " $name
echo "The key of cypher is: " $saved_key # show other random cypher ex:abc45aec and used this value.
echo "The file created was:" $OUT_FILE
echo "The file exclued is:" $IN_FILE
}


decrypt_RC4() {
clear_screen

echo -n "Insert the name of the file encryped:"; read OUT_FILE
echo -n "Insert the name of the file for decrypting:"; read IN_FILE

if [[ -z "$OUT_FILE" ]]; then
	echo 
fi

case $option_menu in
1) algorithm_decryptRC4 ;;
esac


echo "The key used is: " $saved_key
echo "The file created was: " $IN_FILE
echo "The file exclued was: " $OUT_FILE	

}


algorithm_encryptRC4(){
openssl enc -rc4 -e -K "$saved_key" -in "$IN_FILE.txt" -out "$OUT_FILE.rc4"
}

algorithm_decryptRC4(){	
openssl enc -rc4 -d -K "$saved_key" -in "$OUT_FILE.rc4" -out "$IN_FILE.txt"
}

clear_screen(){
clear
}

menu_Start

Last edited by Xremix30; 10-15-2018 at 08:58 PM.. Reason: Because my code was Portuguese

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LEARN ABOUT OPENSOLARIS

encrypt

encrypt(3C)						   Standard C Library Functions 					       encrypt(3C)

NAME

       encrypt - encoding function

SYNOPSIS

       #include <crypt.h>

       void encrypt(char block[64], int edflag);

   Standard conforming
       #include <unistd.h>

       void encrypt(char block[64], int edflag);

DESCRIPTION

       The encrypt() function provides (rather primitive) access to the hashing algorithm employed by the crypt(3C) function. The key generated by
       setkey(3C) is used to encrypt the string block with encrypt().

       The block argument to encrypt() is an array of length 64 bytes containing only the bytes with numerical value of 0 and 1. The array is mod-
       ified  in  place to a similar array using the key set by setkey(3C). If edflag is 0, the argument is encoded.  If edflag is 1, the argument
       may be decoded (see the USAGE section below); if the argument is not decoded, errno will be set to ENOSYS.

RETURN VALUES

       The encrypt() function returns no value.

ERRORS

       The encrypt() function will fail if:

       ENOSYS	 The functionality is not supported on this implementation.

USAGE

       In some environments, decoding may not be implemented.  This is related to U.S. Government restrictions on encryption and  decryption  rou-
       tines:  the  DES decryption algorithm cannot be exported outside the U.S.A. Historical practice has been to ship a different version of the
       encryption library without the decryption feature in the routines supplied. Thus the exported version of encrypt() does	encoding  but  not
       decoding.

       Because	encrypt() does not return a value, applications wishing to check for errors should set errno to 0, call encrypt(), then test errno
       and, if it is non-zero, assume an error has occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       crypt(3C), setkey(3C), attributes(5)

SunOS 5.11							    2 May 2001							       encrypt(3C)