23 lines
520 B
Bash
Executable File
23 lines
520 B
Bash
Executable File
#!/bin/bash
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#
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# ex1.bash: Advent2020 game, day 25/game 1.
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CMD=${0##*/}
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shopt -s extglob
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set -o noglob
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declare -a pub=(1 1) enc=(1 1) key
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read -r "key[0]"
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read -r "key[1]"
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while true; do
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((pub[0] = (pub[0] * 7) % 20201227,
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pub[1] = (pub[1] * 7) % 20201227,
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enc[0] = (enc[0] * key[0]) % 20201227,
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enc[1] = (enc[1] * key[1]) % 20201227))
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((pub[0] == key[0])) && res=${enc[1]} && break
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((pub[1] == key[1])) && res=${enc[0]} && break
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done
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printf "%s: res=%s\n" "$CMD" "$res"
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exit 0
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