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Ingy döt Net 2013-10-27 23:48:49 +00:00
parent 776bba907c
commit 372c577f83
233 changed files with 0 additions and 6724 deletions
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29
Task/Vigen-re-cipher/D/vigen-re-cipher.d
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import std.stdio, std.string;
string encrypt(in string txt, in string key) pure
in {
assert(key.removechars("^A-Z") == key);
} body {
string res;
foreach (immutable i, immutable c; toUpper(txt).removechars("^A-Z"))
res ~= (c + key[i % $] - 2 * 'A') % 26 + 'A';
return res;
}
string decrypt(in string txt, in string key) pure
in {
assert(key.removechars("^A-Z") == key);
} body {
string res;
foreach (immutable i, immutable c; toUpper(txt).removechars("^A-Z"))
res ~= (c - key[i % $] + 26) % 26 + 'A';
return res;
}
void main() {
immutable key = "VIGENERECIPHER";
immutable original = "Beware the Jabberwock, my son!" ~
" The jaws that bite, the claws that catch!";
immutable encoded = original.encrypt(key);
writeln(encoded, "\n", encoded.decrypt(key));
}