1 files changed, 0 insertions, 90 deletions
diff --git a/wallet/src/commonMain/kotlin/net/taler/lib/wallet/crypto/Kdf.kt b/wallet/src/commonMain/kotlin/net/taler/lib/wallet/crypto/Kdf.kt
deleted file mode 100644
index 2d714f8..0000000
--- a/wallet/src/commonMain/kotlin/net/taler/lib/wallet/crypto/Kdf.kt
+++ /dev/null
@@ -1,90 +0,0 @@
-/*
- * This file is part of GNU Taler
- * (C) 2020 Taler Systems S.A.
- *
- * GNU Taler is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 3, or (at your option) any later version.
- *
- * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
- */
-
-package net.taler.lib.wallet.crypto
-
-import kotlin.experimental.xor
-import kotlin.math.ceil
-
-internal object Kdf {
-
-    const val HMAC_SHA256_BLOCK_SIZE = 64
-    const val HMAC_SHA512_BLOCK_SIZE = 128
-
-    fun kdf(
-        outputLength: Int,
-        ikm: ByteArray,
-        salt: ByteArray,
-        info: ByteArray,
-        sha256: (ByteArray) -> ByteArray,
-        sha512: (ByteArray) -> ByteArray
-    ): ByteArray {
-        //extract
-        val prk = hmacSha512(salt, ikm, sha512)
-
-        // expand
-        val n = ceil(outputLength.toDouble() / 32).toInt()
-        val output = ByteArray(n * 32)
-        for (i in 0 until n) {
-            val buf: ByteArray
-            if (i == 0) {
-                buf = ByteArray(info.size + 1)
-                info.copyInto(buf)
-            } else {
-                buf = ByteArray(info.size + 1 + 32)
-                for (j in 0 until 32) {
-                    buf[j] = output[(i - 1) * 32 + j]
-                }
-                info.copyInto(buf, destinationOffset = 32)
-            }
-            buf[buf.size - 1] = (i + 1).toByte()
-            val chunk = hmacSha256(prk, buf, sha256)
-            chunk.copyInto(output, destinationOffset = i * 32)
-        }
-        return output.copyOfRange(0, outputLength)
-    }
-
-    fun hmacSha256(key: ByteArray, message: ByteArray, sha256: (ByteArray) -> ByteArray): ByteArray {
-        return hmac(HMAC_SHA256_BLOCK_SIZE, key, message) { sha256(it) }
-    }
-
-    fun hmacSha512(key: ByteArray, message: ByteArray, sha512: (ByteArray) -> ByteArray): ByteArray {
-        return hmac(HMAC_SHA512_BLOCK_SIZE, key, message) { sha512(it) }
-    }
-
-    private fun hmac(blockSize: Int, key: ByteArray, message: ByteArray, hash: (ByteArray) -> ByteArray): ByteArray {
-        var newKey = key
-        if (newKey.size > blockSize) newKey = hash(newKey)
-        if (newKey.size < blockSize) newKey = ByteArray(blockSize).apply {
-            newKey.copyInto(this)
-        }
-        val okp = ByteArray(blockSize)
-        val ikp = ByteArray(blockSize)
-        for (i in 0 until blockSize) {
-            ikp[i] = newKey[i] xor 0x36
-            okp[i] = newKey[i] xor 0x5c
-        }
-        val b1 = ByteArray(blockSize + message.size)
-        ikp.copyInto(b1)
-        message.copyInto(b1, destinationOffset = blockSize)
-        val h0 = hash(b1)
-        val b2 = ByteArray(blockSize + h0.size)
-        okp.copyInto(b2)
-        h0.copyInto(b2, destinationOffset = blockSize)
-        return hash(b2)
-    }
-
-}