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| 1 | - | function substitutionCipher() |
| 1 | + | function substitutionCipher() |
| 2 | - | {
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| 2 | + | {
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| 3 | - | var str = prompt("Enter a string to encrypt","").toUpperCase().replace(/[^A-Z]*/g,'');
|
| 3 | + | var str = prompt("Enter a string to encrypt","").toUpperCase().replace(/[^A-Z]*/g,'');
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| 4 | - | var pwd = prompt("Enter you Little Orphan Annie secret password","").toUpperCase().replace(/[^A-Z]*/g,'');
|
| 4 | + | var pwd = prompt("Enter you Little Orphan Annie secret password","").toUpperCase().replace(/[^A-Z]*/g,'');
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| 5 | - | var endecrypted = ''; |
| 5 | + | var endecrypted = ''; |
| 6 | - | var alphabet = cypherbet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
| 6 | + | var alphabet = cypherbet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
| 7 | - | var charBox = ''; |
| 7 | + | var charBox = ''; |
| 8 | - | var i = len = 0; |
| 8 | + | var i = len = 0; |
| 9 | - | var encryptFlag = confirm('To encrypt, click OK. To decrypt click CANCEL.');
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| 9 | + | var encryptFlag = confirm('To encrypt, click OK. To decrypt click CANCEL.');
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| 10 | - | |
| 10 | + | |
| 11 | - | /* strip duplicate letters from the password */ |
| 11 | + | /* strip duplicate letters from the password */ |
| 12 | - | for(i = 0, len = pwd.length; i < len; i++) |
| 12 | + | for(i = 0, len = pwd.length; i < len; i++) |
| 13 | {
| |
| 14 | - | if(!charBox || charBox.indexOf(pwd.charAt(i)) < 0 ) |
| 14 | + | if(!charBox || charBox.indexOf(pwd.charAt(i)) < 0 ) |
| 15 | {
| |
| 16 | - | charBox += pwd.charAt(i); |
| 16 | + | charBox += pwd.charAt(i); |
| 17 | - | cypherbet = cypherbet.replace(pwd.charAt(i),''); /*remove the password character from the cyphered alphabet for now*/ |
| 17 | + | cypherbet = cypherbet.replace(pwd.charAt(i),''); /*remove the password character from the cyphered alphabet for now*/ |
| 18 | } | |
| 19 | } | |
| 20 | - | pwd = charBox; /*replace the password with the result of stripping redundant characters from the password*/ |
| 20 | + | pwd = charBox; /*replace the password with the result of stripping redundant characters from the password*/ |
| 21 | - | |
| 21 | + | |
| 22 | ||
| 23 | - | |
| 23 | + | |
| 24 | - | /*prepend the password to the cyphered alphabet*/ |
| 24 | + | /*prepend the password to the cyphered alphabet*/ |
| 25 | - | cypherbet = pwd + cypherbet; |
| 25 | + | cypherbet = pwd + cypherbet; |
| 26 | - | |
| 26 | + | |
| 27 | - | |
| 27 | + | |
| 28 | - | for(i = 0, len = str.length; i < len; i++) |
| 28 | + | for(i = 0, len = str.length; i < len; i++) |
| 29 | - | {
|
| 29 | + | {
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| 30 | - | if(encryptFlag) |
| 30 | + | if(encryptFlag) |
| 31 | {
| |
| 32 | - | if(endecrypted && i % 5 == 0) |
| 32 | + | if(endecrypted && i % 5 == 0) |
| 33 | - | {
|
| 33 | + | |
| 34 | - | endecrypted += ' '; |
| 34 | + | endecrypted += ' '; |
| 35 | - | } |
| 35 | + | |
| 36 | - | endecrypted += cypherbet.charAt(alphabet.indexOf(str.charAt(i))); |
| 36 | + | endecrypted += cypherbet.charAt(alphabet.indexOf(str.charAt(i))); |
| 37 | - | }else{
|
| 37 | + | }else{
|
| 38 | - | endecrypted += alphabet.charAt(cypherbet.indexOf(str.charAt(i))); |
| 38 | + | endecrypted += alphabet.charAt(cypherbet.indexOf(str.charAt(i))); |
| 39 | } | |
| 40 | - | } |
| 40 | + | } |
| 41 | ||
| 42 | - | alert(endecrypted); |
| 42 | + | alert(endecrypted); |
| 43 | - | } |
| 43 | + | } |
| 44 | ||
| 45 | - | substitutionCipher(); |
| 45 | + | substitutionCipher(); |
