29 lines
792 B
Nim
29 lines
792 B
Nim
import sequtils, strutils
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proc encrypt(key: seq[char]; msg: string): string =
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result.setLen(msg.len)
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for i, c in msg:
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result[i] = key[ord(c) - 32]
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proc decrypt(key: seq[char]; msg: string): string =
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result.setLen(msg.len)
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for i, c in msg:
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result[i] = chr(key.find(c) + 32)
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when isMainModule:
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import random
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randomize()
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# Build a random key.
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var key = toSeq(32..126).mapIt(chr(it)) # All printable characters.
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key.shuffle()
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const Message = "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"
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let encrypted = key.encrypt(Message)
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let decrypted = key.decrypt(encrypted)
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echo "Key = “$#”" % key.join()
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echo "Message = “$#”" % Message
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echo "Encrypted = “$#”" % encrypted
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echo "Decrypted = “$#”" % decrypted
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