From abb503a88f4440d10691f5a52c5e4e75e60fe663 Mon Sep 17 00:00:00 2001
From: Aishwarya0601 <69068161+Aishwarya0601@users.noreply.github.com>
Date: Tue, 16 Nov 2021 00:37:23 +0530
Subject: [PATCH 1/4] Add implementation for 3-DES Encryption

---
 src/main/kotlin/DESEncryption.kt | 54 ++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 src/main/kotlin/DESEncryption.kt

diff --git a/src/main/kotlin/DESEncryption.kt b/src/main/kotlin/DESEncryption.kt
new file mode 100644
index 0000000..fc6cbde
--- /dev/null
+++ b/src/main/kotlin/DESEncryption.kt
@@ -0,0 +1,54 @@
+import javax.crypto.Cipher
+import javax.crypto.spec.IvParameterSpec
+import javax.crypto.spec.SecretKeySpec
+import javax.crypto.SecretKey
+import java.util.Arrays
+import java.security.MessageDigest
+
+
+class TripleDESDemo {
+    fun encrypt(message: String): ByteArray {
+        val md = MessageDigest.getInstance("md5")
+        val digestOfPassword = md.digest("HG58YZ3CR9".toByteArray(charset("utf-8")))
+        val keyBytes = Arrays.copyOf(digestOfPassword, 24)
+        var j = 0
+        var k = 16
+        while (j < 8) {
+            keyBytes[k++] = keyBytes[j++]
+        }
+        val key: SecretKey = SecretKeySpec(keyBytes, "DESede")
+        val iv = IvParameterSpec(ByteArray(8))
+        val cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding")
+        cipher.init(Cipher.ENCRYPT_MODE, key, iv)
+        val plainTextBytes = message.toByteArray(charset("utf-8"))
+        return cipher.doFinal(plainTextBytes)
+    }
+
+    fun decrypt(message: ByteArray?): String {
+        val md = MessageDigest.getInstance("md5")
+        val digestOfPassword = md.digest("HG58YZ3CR9".toByteArray(charset("utf-8")))
+        val keyBytes = Arrays.copyOf(digestOfPassword, 24)
+        var j = 0
+        var k = 16
+        while (j < 8) {
+            keyBytes[k++] = keyBytes[j++]
+        }
+        val key: SecretKey = SecretKeySpec(keyBytes, "DESede")
+        val iv = IvParameterSpec(ByteArray(8))
+        val decipher = Cipher.getInstance("DESede/CBC/PKCS5Padding")
+        decipher.init(Cipher.DECRYPT_MODE, key, iv)
+        val plainText = decipher.doFinal(message)
+        return String(plainText)
+    }
+
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            val text = "Kotlin is a powerful programming language"
+            val codedtext = TripleDESDemo().encrypt(text)
+            val decodedtext = TripleDESDemo().decrypt(codedtext)
+            println(codedtext)
+            println(decodedtext)
+        }
+    }
+}
\ No newline at end of file

From f29058fb2266acfe70be7517634beac292da451d Mon Sep 17 00:00:00 2001
From: Aishwarya0601 <69068161+Aishwarya0601@users.noreply.github.com>
Date: Tue, 16 Nov 2021 00:38:15 +0530
Subject: [PATCH 2/4] Add folder for Encryption algorithms

---
 src/main/kotlin/{ => Encryption}/DESEncryption.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename src/main/kotlin/{ => Encryption}/DESEncryption.kt (97%)

diff --git a/src/main/kotlin/DESEncryption.kt b/src/main/kotlin/Encryption/DESEncryption.kt
similarity index 97%
rename from src/main/kotlin/DESEncryption.kt
rename to src/main/kotlin/Encryption/DESEncryption.kt
index fc6cbde..ce8a215 100644
--- a/src/main/kotlin/DESEncryption.kt
+++ b/src/main/kotlin/Encryption/DESEncryption.kt
@@ -51,4 +51,4 @@ class TripleDESDemo {
             println(decodedtext)
         }
     }
-}
\ No newline at end of file
+}

From 980b08be0017564d30d20f98b3ef31d5e60db9c6 Mon Sep 17 00:00:00 2001
From: Aishwarya0601 <69068161+Aishwarya0601@users.noreply.github.com>
Date: Tue, 16 Nov 2021 00:40:45 +0530
Subject: [PATCH 3/4] Add test cases for 3-DES encryption decryption

---
 src/test/kotlin/DESEncTest.kt | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/test/kotlin/DESEncTest.kt

diff --git a/src/test/kotlin/DESEncTest.kt b/src/test/kotlin/DESEncTest.kt
new file mode 100644
index 0000000..44dd032
--- /dev/null
+++ b/src/test/kotlin/DESEncTest.kt
@@ -0,0 +1,28 @@
+import org.junit.Test
+import java.util.*
+
+class DESEncTest {
+
+    @Test
+    fun testWithKotlinString() {
+        val secretText = "Kotlin is a powerful programming language"
+        val encryptedValue = TripleDESDemo().encrypt(secretText)
+        assert(TripleDESDemo().decrypt(encryptedValue)==secretText)
+
+    }
+    @Test
+    fun testWithIntellIjString() {
+        val secretText = "InteliJ IDEA Community Edition"
+        val encryptedValue = TripleDESDemo().encrypt(secretText)
+        assert(TripleDESDemo().decrypt(encryptedValue)==secretText)
+
+    }
+    @Test
+    fun testWithAlgorithmjString() {
+        val secretText = "Algorithm-Repo"
+        val encryptedValue = TripleDESDemo().encrypt(secretText)
+        assert(TripleDESDemo().decrypt(encryptedValue)==secretText)
+
+    }
+
+}
\ No newline at end of file

From e7cc559f9ff0b402d8a4a109ad7453b515937a7d Mon Sep 17 00:00:00 2001
From: Aishwarya0601 <69068161+Aishwarya0601@users.noreply.github.com>
Date: Tue, 16 Nov 2021 00:41:40 +0530
Subject: [PATCH 4/4] Add folder for test cases for encryption algorithms

---
 src/test/kotlin/{ => Encryption}/DESEncTest.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename src/test/kotlin/{ => Encryption}/DESEncTest.kt (96%)

diff --git a/src/test/kotlin/DESEncTest.kt b/src/test/kotlin/Encryption/DESEncTest.kt
similarity index 96%
rename from src/test/kotlin/DESEncTest.kt
rename to src/test/kotlin/Encryption/DESEncTest.kt
index 44dd032..fd4202c 100644
--- a/src/test/kotlin/DESEncTest.kt
+++ b/src/test/kotlin/Encryption/DESEncTest.kt
@@ -25,4 +25,4 @@ class DESEncTest {
 
     }
 
-}
\ No newline at end of file
+}