Compute SHA256 Hash in Android/Java and C#
Your Java code is wrong: you are adding the input bytes twice. If you are calculating this in one go, you need to either call only digest(bytes) or call digest() after update(bytes);
I was looking for a Kotlin version for my Android app.
I could not find one; here is what I came up with:
fun String.getSha256(): String { val digest = MessageDigest.getInstance("SHA-256").apply { reset() } val byteData: ByteArray = digest.digest(this.toByteArray()) return StringBuffer().apply { byteData.forEach { append(((it.toInt() and 0xff) + 0x100).toString(16).substring(1)) } }.toString()}