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Fix columnarTranspositionCipher and typos in Test (#5649)

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SAIVARDHAN15
2024-10-10 01:11:25 +05:30
committed by GitHub
parent 029dd85646
commit 6e6028e3d0
2 changed files with 21 additions and 22 deletions
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29
src/main/java/com/thealgorithms/ciphers/ColumnarTranspositionCipher.java
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@ -27,13 +27,13 @@ public final class ColumnarTranspositionCipher {
* @return a String with the word encrypted by the Columnar Transposition * @return a String with the word encrypted by the Columnar Transposition
* Cipher Rule * Cipher Rule
*/ */
public static String encrpyter(String word, String keyword) { public static String encrypt(final String word, final String keyword) {
ColumnarTranspositionCipher.keyword = keyword; ColumnarTranspositionCipher.keyword = keyword;
abecedariumBuilder(500); abecedariumBuilder();
table = tableBuilder(word); table = tableBuilder(word);
Object[][] sortedTable = sortTable(table); Object[][] sortedTable = sortTable(table);
StringBuilder wordEncrypted = new StringBuilder(); StringBuilder wordEncrypted = new StringBuilder();
for (int i = 0; i < sortedTable[i].length; i++) { for (int i = 0; i < sortedTable[0].length; i++) {
for (int j = 1; j < sortedTable.length; j++) { for (int j = 1; j < sortedTable.length; j++) {
wordEncrypted.append(sortedTable[j][i]); wordEncrypted.append(sortedTable[j][i]);
} }
@ -51,11 +51,12 @@ public final class ColumnarTranspositionCipher {
* @return a String with the word encrypted by the Columnar Transposition * @return a String with the word encrypted by the Columnar Transposition
* Cipher Rule * Cipher Rule
*/ */
public static String encrpyter(String word, String keyword, String abecedarium) { public static String encrypt(String word, String keyword, String abecedarium) {
ColumnarTranspositionCipher.keyword = keyword; ColumnarTranspositionCipher.keyword = keyword;
ColumnarTranspositionCipher.abecedarium = Objects.requireNonNullElse(abecedarium, ABECEDARIUM); ColumnarTranspositionCipher.abecedarium = Objects.requireNonNullElse(abecedarium, ABECEDARIUM);
table = tableBuilder(word); table = tableBuilder(word);
Object[][] sortedTable = sortTable(table); Object[][] sortedTable = sortTable(table);
StringBuilder wordEncrypted = new StringBuilder(); StringBuilder wordEncrypted = new StringBuilder();
for (int i = 0; i < sortedTable[0].length; i++) { for (int i = 0; i < sortedTable[0].length; i++) {
for (int j = 1; j < sortedTable.length; j++) { for (int j = 1; j < sortedTable.length; j++) {
@ -72,7 +73,7 @@ public final class ColumnarTranspositionCipher {
* @return a String decrypted with the word encrypted by the Columnar * @return a String decrypted with the word encrypted by the Columnar
* Transposition Cipher Rule * Transposition Cipher Rule
*/ */
public static String decrypter() { public static String decrypt() {
StringBuilder wordDecrypted = new StringBuilder(); StringBuilder wordDecrypted = new StringBuilder();
for (int i = 1; i < table.length; i++) { for (int i = 1; i < table.length; i++) {
for (Object item : table[i]) { for (Object item : table[i]) {
@ -91,14 +92,14 @@ public final class ColumnarTranspositionCipher {
*/ */
private static Object[][] tableBuilder(String word) { private static Object[][] tableBuilder(String word) {
Object[][] table = new Object[numberOfRows(word) + 1][keyword.length()]; Object[][] table = new Object[numberOfRows(word) + 1][keyword.length()];
char[] wordInChards = word.toCharArray(); char[] wordInChars = word.toCharArray();
// Fils in the respective numbers // Fills in the respective numbers for the column
table[0] = findElements(); table[0] = findElements();
int charElement = 0; int charElement = 0;
for (int i = 1; i < table.length; i++) { for (int i = 1; i < table.length; i++) {
for (int j = 0; j < table[i].length; j++) { for (int j = 0; j < table[i].length; j++) {
if (charElement < wordInChards.length) { if (charElement < wordInChars.length) {
table[i][j] = wordInChards[charElement]; table[i][j] = wordInChars[charElement];
charElement++; charElement++;
} else { } else {
table[i][j] = ENCRYPTION_FIELD_CHAR; table[i][j] = ENCRYPTION_FIELD_CHAR;
@ -116,7 +117,7 @@ public final class ColumnarTranspositionCipher {
* order to respect the Columnar Transposition Cipher Rule. * order to respect the Columnar Transposition Cipher Rule.
*/ */
private static int numberOfRows(String word) { private static int numberOfRows(String word) {
if (word.length() / keyword.length() > word.length() / keyword.length()) { if (word.length() % keyword.length() != 0) {
return (word.length() / keyword.length()) + 1; return (word.length() / keyword.length()) + 1;
} else { } else {
return word.length() / keyword.length(); return word.length() / keyword.length();
@ -173,13 +174,11 @@ public final class ColumnarTranspositionCipher {
} }
/** /**
* Creates an abecedarium with a specified ascii inded * Creates an abecedarium with all available ascii values.
*
* @param value Number of characters being used based on the ASCII Table
*/ */
private static void abecedariumBuilder(int value) { private static void abecedariumBuilder() {
StringBuilder t = new StringBuilder(); StringBuilder t = new StringBuilder();
for (int i = 0; i < value; i++) { for (int i = 0; i < 256; i++) {
t.append((char) i); t.append((char) i);
} }
abecedarium = t.toString(); abecedarium = t.toString();

14
src/test/java/com/thealgorithms/ciphers/ColumnarTranspositionCipherTest.java
View File

@ -20,7 +20,7 @@ public class ColumnarTranspositionCipherTest {
@Test @Test
public void testEncryption() { public void testEncryption() {
String encryptedText = ColumnarTranspositionCipher.encrpyter(plaintext, keyword); String encryptedText = ColumnarTranspositionCipher.encrypt(plaintext, keyword);
assertNotNull(encryptedText, "The encrypted text should not be null."); assertNotNull(encryptedText, "The encrypted text should not be null.");
assertFalse(encryptedText.isEmpty(), "The encrypted text should not be empty."); assertFalse(encryptedText.isEmpty(), "The encrypted text should not be empty.");
// Check if the encrypted text is different from the plaintext // Check if the encrypted text is different from the plaintext
@ -29,19 +29,19 @@ public class ColumnarTranspositionCipherTest {
@Test @Test
public void testDecryption() { public void testDecryption() {
String encryptedText = ColumnarTranspositionCipher.encrpyter(plaintext, keyword); String encryptedText = ColumnarTranspositionCipher.encrypt(plaintext, keyword);
String decryptedText = ColumnarTranspositionCipher.decrypter(); String decryptedText = ColumnarTranspositionCipher.decrypt();
assertEquals(plaintext.replaceAll(" ", ""), decryptedText.replaceAll(" ", ""), "The decrypted text should match the original plaintext, ignoring spaces."); assertEquals(plaintext.replaceAll(" ", ""), decryptedText.replaceAll(" ", ""), "The decrypted text should match the original plaintext, ignoring spaces.");
assertEquals(encryptedText, ColumnarTranspositionCipher.encrpyter(plaintext, keyword), "The encrypted text should be the same when encrypted again."); assertEquals(encryptedText, ColumnarTranspositionCipher.encrypt(plaintext, keyword), "The encrypted text should be the same when encrypted again.");
} }
@Test @Test
public void testLongPlainText() { public void testLongPlainText() {
String longText = "This is a significantly longer piece of text to test the encryption and decryption capabilities of the Columnar Transposition Cipher. It should handle long strings gracefully."; String longText = "This is a significantly longer piece of text to test the encryption and decryption capabilities of the Columnar Transposition Cipher. It should handle long strings gracefully.";
String encryptedText = ColumnarTranspositionCipher.encrpyter(longText, keyword); String encryptedText = ColumnarTranspositionCipher.encrypt(longText, keyword);
String decryptedText = ColumnarTranspositionCipher.decrypter(); String decryptedText = ColumnarTranspositionCipher.decrypt();
assertEquals(longText.replaceAll(" ", ""), decryptedText.replaceAll(" ", ""), "The decrypted text should match the original long plaintext, ignoring spaces."); assertEquals(longText.replaceAll(" ", ""), decryptedText.replaceAll(" ", ""), "The decrypted text should match the original long plaintext, ignoring spaces.");
assertEquals(encryptedText, ColumnarTranspositionCipher.encrpyter(longText, keyword), "The encrypted text should be the same when encrypted again."); assertEquals(encryptedText, ColumnarTranspositionCipher.encrypt(longText, keyword), "The encrypted text should be the same when encrypted again.");
} }
} }