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Full Discussion: Converting parts of a string to "Hex"
Top Forums Shell Programming and Scripting Converting parts of a string to "Hex" Post 302699801 by HansHansen on Wednesday 12th of September 2012 10:24:16 AM
Old 09-12-2012
Converting parts of a string to "Hex"
Hi Guys,

writing a small shell script, i need to convert parts of a string to "Hex". The problem is that it is not the full string that needs to be converted.
I think it's best to show an example:

$astring = "xxxxxx ABC+10+##########+DEF xxxx"

This is only an example to show how the string could look like. There can be many characters at the beginning, then there is a "starting code" ABC, a value which say's how long the element it (10 in this case), then the some unprintable hex characters (just marked as #) and the "end mark" DEF.

As the hex char's are not displayable, they should be displayed as "\x39" for example. So the above string should result in

$astring = "xxxxxx ABC+10+\x39\x55\x12\x84\xA7\x9F\x2C\xB1\xFF\x12+DEF xxxx"

after the conversion.

The only thing i can do is to loop through the string, find "ABC", get the count number and do the conversion.

Or is there a quicker and simpler solution you could think of?


Thanks a lot for your help !!!

Hans
 

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LEARN ABOUT OSF1

kas_stringtokey

KAS_STRINGTOKEY(8)					       AFS Command Reference						KAS_STRINGTOKEY(8)

NAME

       kas_stringtokey - Converts a character string into an octal key

SYNOPSIS

       kas stringtokey -string <password string>
	   [-cell <cell name>] [-help]

       kas str -s <password string> [-c <cell name>] [-h]

DESCRIPTION

       The kas stringtokey command converts the character string specified with the -string argument into an octal string suitable for use as an
       encryption key.

       The kas command interpreter generates the octal key by using an encryption algorithm on the combination of the specified string and the
       name of the local cell (as recorded in the local /etc/openafs/ThisCell file). Use the -cell argument to convert a string into a key
       appropriate for a cell other than the local one.

CAUTIONS

       This command writes the key to the standard output stream, on which it can possibly be intercepted by third parties. It is not very secure
       to use the key in an actual Authentication Database entry.

OPTIONS

       -string <password string>
	   Specifies the character string to convert into an octal key.

       -cell <cell name>
	   Specifies the complete Internet domain name of the cell to combine with the password string while generating the key. If this argument
	   is omitted, the kas command interpreter determines the name of the local cell by consulting:

	   o   First, the value of the environment variable AFSCELL.

	   o   Second, the cellname in the /etc/openafs/ThisCell file on the local machine.

       -help
	   Prints the online help for this command. All other valid options are ignored.

OUTPUT

       The output is of the following form:

	  Converting I<password string> in realm 'I<cell_name>' yields key='I<key>'.

EXAMPLES

       The following example shows the octal key equivalent of the string "new_pswd" in the ABC Corporation cell.

	  % kas stringtokey new_pswd
	  Converting new_pswd in realm 'ABC.COM' yields
	      key='346307364320263233342354'.

PRIVILEGE REQUIRED

       None, and no password is required.

SEE ALSO

       ThisCell(5), kas(8)

COPYRIGHT

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD by software written by Chas
       Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.

OpenAFS 							    2012-03-26							KAS_STRINGTOKEY(8)
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