From b554f64b51dbc5f087035c7c425b8fb4ed2f0846 Mon Sep 17 00:00:00 2001
From: sanjay <sanjay.babukrishna@bigtec.co.in>
Date: Thu, 7 Mar 2024 09:55:56 +0530
Subject: [PATCH] setting up encryption

---
 .../hpostesting/encryption/Encryption.kt      | 42 +++++++++++++++++++
 .../DeviceProvisionFragment.kt                |  5 +++
 2 files changed, 47 insertions(+)
 create mode 100644 app/src/main/java/com/example/hpostesting/encryption/Encryption.kt

diff --git a/app/src/main/java/com/example/hpostesting/encryption/Encryption.kt b/app/src/main/java/com/example/hpostesting/encryption/Encryption.kt
new file mode 100644
index 0000000..27e1f46
--- /dev/null
+++ b/app/src/main/java/com/example/hpostesting/encryption/Encryption.kt
@@ -0,0 +1,42 @@
+package com.example.hpostesting.encryption
+
+import android.util.Base64
+import javax.crypto.Cipher
+import javax.crypto.SecretKeyFactory
+import javax.crypto.spec.IvParameterSpec
+import javax.crypto.spec.PBEKeySpec
+import javax.crypto.spec.SecretKeySpec
+
+object Encryption {
+    private const val AES_MODE = "AES/CBC/PKCS5Padding"
+    private const val KEY_SPEC_ALGORITHM = "PBKDF2WithHmacSHA1"
+    private const val SALT = "Bigtec"
+    private const val ITERATION_COUNT = 10000
+    private const val KEY_LENGTH = 256
+    private val FIXED_IV = byteArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
+
+    fun encrypt(textToEncrypt: String, password: String): String {
+        val salt = SALT.toByteArray()
+        val factory = SecretKeyFactory.getInstance(KEY_SPEC_ALGORITHM)
+        val spec = PBEKeySpec(password.toCharArray(), salt, ITERATION_COUNT, KEY_LENGTH)
+        val tmp = factory.generateSecret(spec)
+        val key = SecretKeySpec(tmp.encoded, "AES")
+        val cipher = Cipher.getInstance(AES_MODE)
+        cipher.init(Cipher.ENCRYPT_MODE, key, IvParameterSpec(FIXED_IV))
+        val encryptedBytes = cipher.doFinal(textToEncrypt.toByteArray(Charsets.UTF_8))
+        return Base64.encodeToString(encryptedBytes, Base64.NO_WRAP)
+    }
+
+    fun decrypt(encryptedText: String, password: String): String {
+        val salt = SALT.toByteArray()
+        val encryptedBytes = Base64.decode(encryptedText, Base64.NO_WRAP)
+        val factory = SecretKeyFactory.getInstance(KEY_SPEC_ALGORITHM)
+        val spec = PBEKeySpec(password.toCharArray(), salt, ITERATION_COUNT, KEY_LENGTH)
+        val tmp = factory.generateSecret(spec)
+        val key = SecretKeySpec(tmp.encoded, "AES")
+        val cipher = Cipher.getInstance(AES_MODE)
+        cipher.init(Cipher.DECRYPT_MODE, key, IvParameterSpec(FIXED_IV))
+        val decryptedBytes = cipher.doFinal(encryptedBytes)
+        return String(decryptedBytes, Charsets.UTF_8)
+    }
+}
diff --git a/app/src/main/java/com/example/hpostesting/presentation/deviceprovision/DeviceProvisionFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/deviceprovision/DeviceProvisionFragment.kt
index 10d34eb..8100091 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/deviceprovision/DeviceProvisionFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/deviceprovision/DeviceProvisionFragment.kt
@@ -221,4 +221,9 @@ class DeviceProvisionFragment : Fragment() {
             }
         }
     }
+
+    private fun encryptAndSaveToFile(){
+
+    }
+
 }
\ No newline at end of file