Playfair cipher: Difference between revisions
Content added Content deleted
(→{{header|REXX}}: added the REXX language. -- ~~~~) |
m (→{{header|REXX}}: shortened a few statements. -- ~~~~) |
||
| Line 374: | Line 374: | ||
if \isLet(noX) then call err '"omitted" letter must be a Latin alphabet letter.' |
if \isLet(noX) then call err '"omitted" letter must be a Latin alphabet letter.' |
||
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 |
||
fill=space(translate('ABCDEFGHIJKLMNOPQRSTUVWXYZ',,noX),0) |
fill=space(translate('ABCDEFGHIJKLMNOPQRSTUVWXYZ',,noX),0) /*remove NOX*/ |
||
/* [↑] remove the NOX character*/ |
|||
newK= /* [↓] remove any duplicate chars*/ |
newK= /* [↓] remove any duplicate chars*/ |
||
do j=1 for length(oldK); _=substr(oldK,j,1) |
do j=1 for length(oldK); _=substr(oldK,j,1) |
||
| Line 383: | Line 382: | ||
grid=left(newK || fill,26) /*use only the first 25 chars. */ |
grid=left(newK || fill,26) /*use only the first 25 chars. */ |
||
say ' new cypher=' newK |
say ' new cypher=' newK |
||
say ' grid fill=' fill |
|||
say ' grid text=' grid |
|||
say ' old phrase=' oldX |
say ' old phrase=' oldX |
||
say ' new phrase=' newX |
say ' new phrase=' newX |
||
say ' new digram=' digram(newX) |
say ' new digram=' digram(newX) |
||
#=0 |
#=0 |
||
do row =1 for 5 /*build grid (individual cells).*/ |
|||
do col=1 for 5; #=#+1; @.row.col=substr(grid,#,1) |
|||
if row==1 then @.0.col=@.1.col |
|||
if col==5 then do; @.row.6=@.row.1; @.row.0=@.row.5; end |
|||
if row==5 then do; @.6.col=@.1.col; @.0.col=@.5.col; end |
|||
end /*col*/ |
|||
end /*row*/ |
|||
end /*col*/ |
|||
end /*row*/ |
|||
say |
say |
||
cText=.playfair(newX, 1); say ' cypher text=' digram(cText) |
cText=.playfair(newX, 1); say ' cypher text=' digram(cText) |
||
| Line 426: | Line 421: | ||
if _==substr(T,k+1,1) then T=left(T,k) || 'X' || substr(T,k+1) |
if _==substr(T,k+1,1) then T=left(T,k) || 'X' || substr(T,k+1) |
||
end /*k*/ |
end /*k*/ |
||
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 |
||
if len==1 | L==R then __=L || 'X' /*append an "X" character, rule 1*/ |
if len==1 | L==R then __=L || 'X' /*append an "X" character, rule 1*/ |
||