1 files changed, 0 insertions, 65 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/XSalsa20Engine.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/XSalsa20Engine.java
deleted file mode 100644
index 0acbf101e..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/XSalsa20Engine.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package org.spongycastle.crypto.engines;
-
-import org.spongycastle.crypto.util.Pack;
-
-/**
- * Implementation of Daniel J. Bernstein's XSalsa20 stream cipher - Salsa20 with an extended nonce.
- * <p>
- * XSalsa20 requires a 256 bit key, and a 192 bit nonce.
- */
-public class XSalsa20Engine extends Salsa20Engine
-{
-
-    public String getAlgorithmName()
-    {
-        return "XSalsa20";
-    }
-
-    protected int getNonceSize()
-    {
-        return 24;
-    }
-
-    /**
-     * XSalsa20 key generation: process 256 bit input key and 128 bits of the input nonce
-     * using a core Salsa20 function without input addition to produce 256 bit working key
-     * and use that with the remaining 64 bits of nonce to initialize a standard Salsa20 engine state.
-     */
-    protected void setKey(byte[] keyBytes, byte[] ivBytes)
-    {
-        if (keyBytes.length != 32)
-        {
-            throw new IllegalArgumentException(getAlgorithmName() + " requires a 256 bit key");
-        }
-
-        // Set key for HSalsa20
-        super.setKey(keyBytes, ivBytes);
-
-        // Pack next 64 bits of IV into engine state instead of counter
-        engineState[8] = Pack.littleEndianToInt(ivBytes, 8);
-        engineState[9] = Pack.littleEndianToInt(ivBytes, 12);
-
-        // Process engine state to generate Salsa20 key
-        int[] hsalsa20Out = new int[engineState.length];
-        salsaCore(20, engineState, hsalsa20Out);
-
-        // Set new key, removing addition in last round of salsaCore
-        engineState[1] = hsalsa20Out[0] - engineState[0];
-        engineState[2] = hsalsa20Out[5] - engineState[5];
-        engineState[3] = hsalsa20Out[10] - engineState[10];
-        engineState[4] = hsalsa20Out[15] - engineState[15];
-
-        engineState[11] = hsalsa20Out[6] - engineState[6];
-        engineState[12] = hsalsa20Out[7] - engineState[7];
-        engineState[13] = hsalsa20Out[8] - engineState[8];
-        engineState[14] = hsalsa20Out[9] - engineState[9];
-
-        // Last 64 bits of input IV
-        engineState[6] = Pack.littleEndianToInt(ivBytes, 16);
-        engineState[7] = Pack.littleEndianToInt(ivBytes, 20);
-
-        // Counter reset
-        resetCounter();
-    }
-
-}