57 lines
1.3 KiB
Bash
57 lines
1.3 KiB
Bash
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#!/bin/bash
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#
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# Simple script to generate a captcha and rename it with
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# the captcha's value encrypted (AES 128) with a md5 of the AES key.
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# This allow to retrieve captcha's value only with its name
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# if you have the right AES key and also to use a passphrase.
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#
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# The script also contains a visual verification to avoid
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# generating hard to resolve captchas.
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#
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# Parameters :
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# generate_captcha.sh OUT_DIR PASSPHRASE
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#
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# Get parameters
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out=$1
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pass=$2
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do_check=1
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# Verify parameters
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[ -z "$out" ] && out="."
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[ -z "$pass" ] && pass="AAA"
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[ ! -e $out ] && mkdir $out
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# Generate captcha
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res=`./gcaptchaz -f ./scrawl.ttf -o "$out/captcha.png"`
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echo $res | grep "Captcha generated" > /dev/null
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if [ ! $? -eq 0 ] ; then
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echo $res
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exit 1
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fi
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text=`echo $res | cut -d\" -f2`
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# Do verification
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if [ $do_check -eq 1 ] ; then
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emacs "$out/captcha.png"
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echo -n "Enter CAPTCHA value : "
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read user
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if [ "$user" != "$text" ] ; then
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echo "CAPTCHA failed"
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rm -f "$out/captcha.png"
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exit 1
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fi
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echo "CAPTCHA OK"
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fi
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# Encrypt captcha's value to generate captcha's name
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key=`echo -n $pass | md5sum | cut -d' ' -f1`
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enc=`echo -n $text | openssl enc -aes-128-ecb -nosalt -K $key -iv $key`
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enc=`echo -n $enc | hexdump -e '"%02x"'`
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mv "$out/captcha.png" "$out/$enc.png"
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