1 files changed, 0 insertions, 73 deletions
diff --git a/app/src/main/java/com/zeapo/pwdstore/utils/Otp.kt b/app/src/main/java/com/zeapo/pwdstore/utils/Otp.kt
deleted file mode 100644
index 994b4d82..00000000
--- a/app/src/main/java/com/zeapo/pwdstore/utils/Otp.kt
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
- * SPDX-License-Identifier: GPL-3.0-only
- */
-
-package com.zeapo.pwdstore.utils
-
-import com.github.michaelbull.result.Err
-import com.github.michaelbull.result.runCatching
-import java.nio.ByteBuffer
-import java.util.Locale
-import javax.crypto.Mac
-import javax.crypto.spec.SecretKeySpec
-import kotlin.experimental.and
-import org.apache.commons.codec.binary.Base32
-
-object Otp {
-
-    private val BASE_32 = Base32()
-    private val STEAM_ALPHABET = "23456789BCDFGHJKMNPQRTVWXY".toCharArray()
-
-    init {
-        check(STEAM_ALPHABET.size == 26)
-    }
-
-    fun calculateCode(secret: String, counter: Long, algorithm: String, digits: String) = runCatching {
-        val algo = "Hmac${algorithm.toUpperCase(Locale.ROOT)}"
-        val decodedSecret = BASE_32.decode(secret)
-        val secretKey = SecretKeySpec(decodedSecret, algo)
-        val digest = Mac.getInstance(algo).run {
-            init(secretKey)
-            doFinal(ByteBuffer.allocate(8).putLong(counter).array())
-        }
-        // Least significant 4 bits are used as an offset into the digest.
-        val offset = (digest.last() and 0xf).toInt()
-        // Extract 32 bits at the offset and clear the most significant bit.
-        val code = digest.copyOfRange(offset, offset + 4)
-        code[0] = (0x7f and code[0].toInt()).toByte()
-        val codeInt = ByteBuffer.wrap(code).int
-        check(codeInt > 0)
-        if (digits == "s") {
-            // Steam
-            var remainingCodeInt = codeInt
-            buildString {
-                repeat(5) {
-                    append(STEAM_ALPHABET[remainingCodeInt % 26])
-                    remainingCodeInt /= 26
-                }
-            }
-        } else {
-            // Base 10, 6 to 10 digits
-            val numDigits = digits.toIntOrNull()
-            when {
-                numDigits == null -> {
-                    return Err(IllegalArgumentException("Digits specifier has to be either 's' or numeric"))
-                }
-                numDigits < 6 -> {
-                    return Err(IllegalArgumentException("TOTP codes have to be at least 6 digits long"))
-                }
-                numDigits > 10 -> {
-                    return Err(IllegalArgumentException("TOTP codes can be at most 10 digits long"))
-                }
-                else -> {
-                    // 2^31 = 2_147_483_648, so we can extract at most 10 digits with the first one
-                    // always being 0, 1, or 2. Pad with leading zeroes.
-                    val codeStringBase10 = codeInt.toString(10).padStart(10, '0')
-                    check(codeStringBase10.length == 10)
-                    codeStringBase10.takeLast(numDigits)
-                }
-            }
-        }
-    }
-}