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- Vigenère cipher in pure bash
- #!/usr/local/bin/bash
- # vigenere.sh
- # http://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher
- a="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- [[ "${*/-d/}" != "" ]] &&
- echo "Usage: $0 [-d]" && exit 1
- m=${1:+-}
- printf "string: ";read t
- printf "keyphrase: ";read -s k
- printf "n"
- for ((i=0;i<${#t};i++)); do
- p1=${a%%${t:$i:1}*}
- p2=${a%%${k:$((i%${#k})):1}*}
- d="${d}${a:$(((${#p1}${m:-+}${#p2})%${#a})):1}"
- done
- echo "$d"
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