Des encryption

src/main/kotlin/Encryption/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)
+        }
+    }
+}

src/test/kotlin/Encryption/DESEncTest.kt

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+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)
+
+    }
+
+}