Playfair cipher: Difference between revisions
Content added Content deleted
m (→{{header|REXX}}: changed an error message concerning when the specified Playfair cypher key is too short. -- ~~~~) |
(→{{header|REXX}}: fixed two unset variables. -- ~~~~) |
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if newX=='' then call err 'PHRASE is empty or has no letters' |
if newX=='' then call err 'PHRASE is empty or has no letters' |
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if length(noX)\==1 then call err '"omitted" letter must be only one letter' |
if length(noX)\==1 then call err '"omitted" letter must be only one letter' |
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| ⚫ | |||
if \datatype(noX,'M') then call err '"omitted" letter must be a Latin alphabet letter.' |
if \datatype(noX,'M') then call err '"omitted" letter must be a Latin alphabet letter.' |
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if pos(noX,oldX)\==0 then call err 'PHRASE can''t contain the "OMIT" character: ' noX |
if pos(noX,oldX)\==0 then call err 'PHRASE can''t contain the "OMIT" character: ' noX |
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if pos(_,newK)==0 then newK=newK || _ |
if pos(_,newK)==0 then newK=newK || _ |
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end /*j*/ |
end /*j*/ |
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| ⚫ | |||
fill=space(translate(fill,,newK),0) /*remove any cypher characters. */ |
fill=space(translate(fill,,newK),0) /*remove any cypher characters. */ |
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grid=left(newK || fill,26) /*use only the first 25 chars. */ |
grid=left(newK || fill,26) /*use only the first 25 chars. */ |
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end /*k*/ |
end /*k*/ |
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do j=1 by 2 to length(T); __=strip(substr(T,j,2)); call LR |
do j=1 by 2 to length(T); __=strip(substr(T,j,2)); call LR |
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if |
if length(__)==1 then __=__ || 'X'; call LR /*append an "X" character, rule 1*/ |
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select |
select |
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when rowL==rowR then __=@@(rowL, colL+i)@@(rowR, colR+i) /*rule 2*/ |
when rowL==rowR then __=@@(rowL, colL+i)@@(rowR, colR+i) /*rule 2*/ |
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