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author | Lars-Dominik Braun <lars@6xq.net> | 2019-02-04 13:09:03 +0100 |
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committer | Lars-Dominik Braun <lars@6xq.net> | 2019-02-04 13:09:03 +0100 |
commit | 04e68443040c7abad84d66477e98f93bed701760 (patch) | |
tree | 2b6202afae659e773bf6916157d23e83edfa44e3 /system/std.zusatz/1.8.7/src/crypt | |
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Initial import
Diffstat (limited to 'system/std.zusatz/1.8.7/src/crypt')
-rw-r--r-- | system/std.zusatz/1.8.7/src/crypt | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/system/std.zusatz/1.8.7/src/crypt b/system/std.zusatz/1.8.7/src/crypt new file mode 100644 index 0000000..b04728a --- /dev/null +++ b/system/std.zusatz/1.8.7/src/crypt @@ -0,0 +1,138 @@ +(* ------------------- VERSION 2 vom 21.04.86 ------------------- *) +PACKET cryptograf DEFINES (* Autor: J.Liedtke *) + + crypt , + decrypt : + +TEXT VAR char , in buffer, out buffer ; +INT VAR in pos , key index ; +DATASPACE VAR scratch space ; +FILE VAR in, out; + +PROC crypt (TEXT CONST file, key) : + + open (file) ; + initialize crypt (key) ; + WHILE NOT eof REP + read char ; + crypt char ; + write char + PER ; + close (file) . + +crypt char : + char := code (( character + random char + key char ) MOD 250) ; + IF key index = LENGTH key + THEN key index := 1 + ELSE key index INCR 1 + FI . + +character : code (char) . + +random char : random (0,250). + +key char : code (key SUB key index) . + +ENDPROC crypt ; + +PROC decrypt (TEXT CONST file, key) : + + open (file) ; + initialize crypt (key) ; + WHILE NOT eof REP + read char ; + decrypt char ; + write char + PER ; + close (file) . + +decrypt char : + char := code (( character - random char - key char ) MOD 250) ; + IF key index = LENGTH key + THEN key index := 1 + ELSE key index INCR 1 + FI . + +character : code (char) . + +random char : random (0,250) . + +key char : code (key SUB key index) . + +ENDPROC decrypt ; + +PROC initialize crypt (TEXT CONST key) : + + INT VAR random key := 0 ; + FOR key index FROM 1 UPTO LENGTH key REP + random key := (random key + code (key SUB key index)) MOD 32000 + PER ; + initialize random (random key) ; + key index := 1 + +ENDPROC initialize crypt ; + +PROC open (TEXT CONST source file) : + + in := sequential file (input, source file) ; + getline (in, in buffer) ; + in pos := 1 ; + forget (scratch space) ; + scratch space := nilspace ; + out := sequential file (output, scratch space) ; + out buffer := "" . + +ENDPROC open ; + +PROC close (TEXT CONST source file) : + + IF out buffer <> "" + THEN putline (out, out buffer) + FI ; + forget (source file, quiet) ; + copy (scratch space, source file) ; + forget (scratch space) . + +ENDPROC close ; + +BOOL PROC eof : + + IF in pos > LENGTH in buffer + THEN eof (in) + ELSE FALSE + FI + +ENDPROC eof ; + +PROC read char : + + IF in pos > 250 + THEN getline (in, in buffer) ; + in pos := 1 ; + read char + ELIF in pos > LENGTH in buffer + THEN in pos := 1 ; + getline (in, in buffer) ; + char := ""13"" + ELSE char := in buffer SUB in pos ; + in pos INCR 1 + FI . + +ENDPROC read char ; + +PROC write char : + + IF char = ""13"" + THEN putline (out, out buffer) ; + out buffer := "" + ELSE out buffer CAT char + FI ; + IF LENGTH out buffer = 250 + THEN putline (out, out buffer) ; + out buffer := "" + FI . + +ENDPROC write char ; + +ENDPACKET cryptograf ; + |