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setting up encryption

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This commit is contained in:
sanjay
2024-03-07 09:55:56 +05:30
parent 95bb428041
commit b554f64b51
2 changed files with 47 additions and 0 deletions
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42
app/src/main/java/com/example/hpostesting/encryption/Encryption.kt Normal file
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@@ -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)
}
}

5
app/src/main/java/com/example/hpostesting/presentation/deviceprovision/DeviceProvisionFragment.kt
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@@ -221,4 +221,9 @@ class DeviceProvisionFragment : Fragment() {
}
}
}
private fun encryptAndSaveToFile(){
}
}