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Update Vigenere.java

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- Remove continue;
- Change condition with Character.isLetter() and Character.isUpperCase();
This commit is contained in:
Fractum
2018-04-15 10:45:31 +02:00
committed by GitHub
parent e48a9ad4f2
commit e53ec53034
1 changed files with 25 additions and 21 deletions
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46
ciphers/Vigenere.java
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@@ -8,49 +8,53 @@ package ciphers;
public class Vigenere {
public static String encrypt(final String message, final String key)
public static String encrypt(final String message, final String key)
{
String result = "";
for (int i = 0, j = 0; i < message.length(); i++)
{
for (int i = 0, j = 0; i < message.length(); i++) {
char c = message.charAt(i);
if (c >= 'A' && c <= 'Z') {
result += (char) ((c + key.toUpperCase().charAt(j) - 2 * 'A') % 26 + 'A');
j = ++j % key.length();
} else if (c >= 'a' && c <= 'z') {
result += (char) ((c + key.toLowerCase().charAt(j) - 2 * 'a') % 26 + 'a');
j = ++j % key.length();
if (Character.isLetter(c)){
if(Character.isUpperCase(c)) {
result += (char) ((c + key.toUpperCase().charAt(j) - 2 * 'A') % 26 + 'A');
} else {
result += (char) ((c + key.toLowerCase().charAt(j) - 2 * 'a') % 26 + 'a');
}
} else {
result+=c;
continue;
}
j = ++j % key.length();
}
return result;
}
public static String decrypt( final String message, final String key)
public static String decrypt( final String message, final String key)
{
String result ="";
for(int i = 0, j = 0; i < message.length(); i++){
char c = message.charAt(i);
if((c >= 'A' && c <= 'Z')){
result += ((char)('Z'-(25-(c-key.toUpperCase().charAt(j)))%26));
}
else if(c >= 'a' && c <= 'z'){
result += ((char)('z'-(25-(c-key.toLowerCase().charAt(j)))%26));
}
else{
if (Character.isLetter(c)){
if(Character.isUpperCase(c)) {
result += ((char)('Z'-(25-(c-key.toUpperCase().charAt(j)))%26));
} else {
result += ((char)('z'-(25-(c-key.toLowerCase().charAt(j)))%26));
}
} else {
result+=c;
continue;
}
j = ++j % key.length();
}
return result;
}
}
public static void main (String [] args){
String text="Hello World!";
String key="itsakey";
@@ -60,4 +64,4 @@ public class Vigenere {
System.out.println(decrypt(ciphertext, key));
}
}
}