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This commit is contained in:
Mylloon 2021-08-28 01:56:10 +02:00
parent 34300daf3b
commit e53d501af3
1 changed files with 8 additions and 8 deletions
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16
app/src/main/java/com/mylloon/mobidl/Credentials.kt
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@ -10,12 +10,12 @@ import java.security.*
class Credentials { class Credentials {
private val provider = "AndroidKeyStore" private val provider = "AndroidKeyStore" // location of the key
private val aliasKeyStore = "MobiDL" private val aliasKeyStore = "MobiDL" // name of the key
private val transformation = "RSA/ECB/PKCS1Padding" private val transformation = "RSA/ECB/PKCS1Padding" // 'type' of the key
@RequiresApi(Build.VERSION_CODES.M) @RequiresApi(Build.VERSION_CODES.M)
fun generateKey() { fun generateKey() { // generate RSA Keys
val keyPairGenerator = KeyPairGenerator.getInstance( val keyPairGenerator = KeyPairGenerator.getInstance(
KeyProperties.KEY_ALGORITHM_RSA, provider KeyProperties.KEY_ALGORITHM_RSA, provider
) )
@ -30,26 +30,26 @@ class Credentials {
keyPairGenerator.generateKeyPair() keyPairGenerator.generateKeyPair()
} }
private fun getPublicKey(): PublicKey { private fun getPublicKey(): PublicKey { // Get the Public RSA key from the Android KeyStore
val keyStore: KeyStore = KeyStore.getInstance(provider) val keyStore: KeyStore = KeyStore.getInstance(provider)
keyStore.load(null) keyStore.load(null)
return keyStore.getCertificate(aliasKeyStore).publicKey return keyStore.getCertificate(aliasKeyStore).publicKey
} }
private fun getPrivateKey(): PrivateKey { private fun getPrivateKey(): PrivateKey { // Get the Private RSA key from the Android KeyStore
val keyStore: KeyStore = KeyStore.getInstance(provider) val keyStore: KeyStore = KeyStore.getInstance(provider)
keyStore.load(null) keyStore.load(null)
return keyStore.getKey(aliasKeyStore, null) as PrivateKey return keyStore.getKey(aliasKeyStore, null) as PrivateKey
} }
private fun encrypt(message: String): ByteArray { private fun encrypt(message: String): ByteArray { // Encrypt a string with the public RSA key
val cipher = Cipher.getInstance(transformation) val cipher = Cipher.getInstance(transformation)
cipher.init(Cipher.ENCRYPT_MODE, getPublicKey()) cipher.init(Cipher.ENCRYPT_MODE, getPublicKey())
return cipher.doFinal(message.toByteArray()) return cipher.doFinal(message.toByteArray())
} }
private fun decrypt(message: ByteArray): String { private fun decrypt(message: ByteArray): String { // Decrypt an encrypted string with the private RSA key
val cipher = Cipher.getInstance(transformation) val cipher = Cipher.getInstance(transformation)
cipher.init(Cipher.DECRYPT_MODE, getPrivateKey()) cipher.init(Cipher.DECRYPT_MODE, getPrivateKey())