Playfair cipher: Difference between revisions
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HI DE TH EG OL DI NT HE TR EX ES TU MP
<br><br>
=={{header|11l}}==
{{trans|Python}}
<lang 11l>F uniq(seq)
[Char] seen
L(x) seq
I x !C seen
seen.append(x)
R seen
F partition(seq, n)
R (0 .< seq.len).step(n).map(i -> @seq[i .< i + @n])
F canonicalize(s)
R s.uppercase().filter(c -> c.is_uppercase()).join(‘’).replace(‘J’, ‘I’)
T Playfair
[String = String] dec, enc
F (key)
V m = partition(uniq(canonicalize(key‘ABCDEFGHIJKLMNOPQRSTUVWXYZ’)), 5)
L(row) m
L(i, j) cart_product(0.<5, 0.<5)
I i != j
.enc[row[i]‘’row[j]] = row[(i + 1) % 5]‘’row[(j + 1) % 5]
L(ci) 5
V c = [m[0][ci], m[1][ci], m[2][ci], m[3][ci], m[4][ci]]
L(i, j) cart_product(0.<5, 0.<5)
I i != j
.enc[c[i]‘’c[j]] = c[(i + 1) % 5]‘’c[(j + 1) % 5]
L(i1, j1, i2, j2) cart_product(0.<5, 0.<5, 0.<5, 0.<5)
I i1 != i2 & j1 != j2
.enc[m[i1][j1]‘’m[i2][j2]] = m[i1][j2]‘’m[i2][j1]
.dec = Dict(.enc.map((k, v) -> (v, k)))
F encode(txt)
V c = canonicalize(txt)
[String] lst
V i = 0
L i < c.len - 1
I c[i + 1] == c[i]
lst [+]= c[i]‘X’
i++
E
lst [+]= c[i]‘’c[i + 1]
i += 2
I i == c.len - 1
lst [+]= c.last‘X’
R lst.map(a -> @.enc[a]).join(‘ ’)
F decode(encoded)
R partition(canonicalize(encoded), 2).map(p -> @.dec[p]).join(‘ ’)
V playfair = Playfair(‘Playfair example’)
V orig = ‘Hide the gold in...the TREESTUMP!!!’
print(‘Original: ’orig)
V enc = playfair.encode(orig)
print(‘Encoded: ’enc)
print(‘Decoded: ’playfair.decode(enc))</lang>
{{out}}
<pre>
Original: Hide the gold in...the TREESTUMP!!!
Encoded: BM OD ZB XD NA BE KU DM UI XM MO UV IF
Decoded: HI DE TH EG OL DI NT HE TR EX ES TU MP
</pre>
=={{header|C++}}==
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