Updated on 2026-08-14

tangem-core/src/main/java/com/tangem/common/extensions/ByteArray.kt

@@ -12,7 +12,7 @@ import kotlin.experimental.xor
  * Extension functions for [ByteArray].
  */
 
-fun ByteArray.toHexString(): String = joinToString("") { "%02x".format(it) }
+fun ByteArray.toHexString(): String = joinToString("") { "%02X".format(it) }
 
 fun ByteArray.toUtf8(): String = String(this).removeSuffix("\u0000")
 

tangem-core/src/test/java/com/tangem/common/extensions/ByteArrayExtensionsTest.kt

@@ -9,7 +9,7 @@ class ByteArrayExtensionsTest {
 
     @Test
     fun `card Id to Hex String`() {
-        val hex = "cb22000000027374"
+        val hex = "CB22000000027374"
         val bytes = byteArrayOf(-53, 34, 0, 0, 0, 2, 115, 116)
         assertThat(bytes.toHexString())
                 .matches(hex)

tangem-core/src/test/java/com/tangem/common/tlv/TlvDecoderTest.kt

@@ -187,6 +187,6 @@ class TlvDecoderTest {
     fun `map Hex returns correct value`() {
         val cardId: String = tlvMapper.decode(TlvTag.CardId)
         assertThat(cardId)
-                .isEqualTo("cb22000000027374")
+                .isEqualTo("CB22000000027374")
     }
 }