From a72e7d744cf5654ec0d9ee676fa5186edbd7843d Mon Sep 17 00:00:00 2001
From: dankito <git@dankito.net>
Date: Sat, 17 Oct 2020 22:56:50 +0200
Subject: [PATCH] Fixed that Byte is signed but Char is unsigned

---
 .../ui/android/security/CryptographyManager.kt       | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/ui/BankingAndroidApp/src/main/java/net/dankito/banking/ui/android/security/CryptographyManager.kt b/ui/BankingAndroidApp/src/main/java/net/dankito/banking/ui/android/security/CryptographyManager.kt
index 5822839a..b99f5f55 100644
--- a/ui/BankingAndroidApp/src/main/java/net/dankito/banking/ui/android/security/CryptographyManager.kt
+++ b/ui/BankingAndroidApp/src/main/java/net/dankito/banking/ui/android/security/CryptographyManager.kt
@@ -130,7 +130,17 @@ open class CryptographyManager {
     }
 
     protected open fun mapToChars(plainTextBytes: ByteArray): CharArray {
-        return plainTextBytes.map { it.toChar() }.toCharArray()
+        return plainTextBytes.map { mapToChar(it) }.toCharArray()
+    }
+
+    protected open fun mapToChar(byte: Byte): Char {
+        // Byte is signed but Char isn't -> convert negative byte values to positive ones
+        if (byte.toInt() < 0) {
+            return (256 + byte.toInt()).toChar()
+        }
+        else {
+            return byte.toChar()
+        }
     }