Updated on 2026-08-14

tangem-sdk/src/main/java/com/tangem/tangem_sdk_new/TerminalKeysStorage.kt

@@ -0,0 +1,56 @@
+package com.tangem.tangem_sdk_new
+
+import android.app.Application
+import android.content.SharedPreferences
+import at.favre.lib.armadillo.Armadillo
+import com.tangem.common.KeyPair
+import com.tangem.common.TerminalKeysService
+import com.tangem.common.extensions.hexToBytes
+import com.tangem.common.extensions.toHexString
+import com.tangem.crypto.CryptoUtils
+
+
+/**
+ * Service for managing Terminal keypair, used for Linked Terminal feature.
+ * Needs to be provided to [com.tangem.CardManager] by calling [com.tangem.CardManager.setTerminalKeysService]
+ * Linked Terminal feature can be disabled manually by editing [com.tangem.Config].
+ * @param applicationContext is required to retrieve an instance of [SharedPreferences]
+ */
+class TerminalKeysStorage(applicationContext: Application): TerminalKeysService {
+
+    private val preferences: SharedPreferences by lazy {
+        Armadillo.create(applicationContext, PREFERENCES_KEY)
+                .encryptionFingerprint(applicationContext)
+                .build()
+    }
+
+    /**
+     * Retrieves generated keys from encrypted shared preferences if the keys exist.
+     * Generates new and stores them in encrypted shared preferences otherwise
+     */
+    override fun getKeys(): KeyPair {
+        val privateKey = preferences.getString(TERMINAL_PRIVATE_KEY, null)?.hexToBytes()
+        val publicKey = preferences.getString(TERMINAL_PUBLIC_KEY, null)?.hexToBytes()
+        return if (privateKey == null || publicKey == null) {
+            generateAndSaveKeys()
+        } else {
+            KeyPair(publicKey, privateKey)
+        }
+    }
+
+    private fun generateAndSaveKeys(): KeyPair {
+        val privateKey = CryptoUtils.generateRandomBytes(32)
+        val publicKey = CryptoUtils.generatePublicKey(privateKey)
+        preferences.edit().putString(TERMINAL_PRIVATE_KEY, privateKey.toHexString()).apply()
+        preferences.edit().putString(TERMINAL_PUBLIC_KEY, publicKey.toHexString()).apply()
+        return KeyPair(publicKey, privateKey)
+    }
+
+
+    companion object {
+        const val PREFERENCES_KEY = "myPrefs"
+        const val TERMINAL_PRIVATE_KEY = "terminalPrivateKey"
+        const val TERMINAL_PUBLIC_KEY = "terminalPublicKey"
+    }
+
+}

tangem-sdk/src/main/java/com/tangem/tangem_sdk_new/nfc/NfcManager.kt

@@ -13,7 +13,7 @@ import android.os.Bundle
 import com.tangem.Log
 
 /**
- * Helps use of NFC, leveraging Android NFC functionality.
+ * Helps use NFC, leveraging Android NFC functionality.
  * Launches [NfcAdapter], manages it with [Activity] lifecycle,
  * enables and disables Nfc Reading Mode, receives NFC [Tag].
  */