1 files changed, 0 insertions, 175 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/KDFFeedbackBytesGenerator.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/KDFFeedbackBytesGenerator.java
deleted file mode 100644
index 6410ec918..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/KDFFeedbackBytesGenerator.java
+++ /dev/null
@@ -1,175 +0,0 @@
-package org.spongycastle.crypto.generators;
-
-import java.math.BigInteger;
-
-import org.spongycastle.crypto.DataLengthException;
-import org.spongycastle.crypto.DerivationParameters;
-import org.spongycastle.crypto.Mac;
-import org.spongycastle.crypto.MacDerivationFunction;
-import org.spongycastle.crypto.params.KDFFeedbackParameters;
-import org.spongycastle.crypto.params.KeyParameter;
-
-/**
- * This KDF has been defined by the publicly available NIST SP 800-108 specification.
- */
-public class KDFFeedbackBytesGenerator
-    implements MacDerivationFunction
-{
-
-    private static final BigInteger INTEGER_MAX = BigInteger.valueOf(Integer.MAX_VALUE);
-    private static final BigInteger TWO = BigInteger.valueOf(2);
-
-    // please refer to the standard for the meaning of the variable names
-    // all field lengths are in bytes, not in bits as specified by the standard
-
-    // fields set by the constructor
-    private final Mac prf;
-    private final int h;
-
-    // fields set by init
-    private byte[] fixedInputData;
-    private int maxSizeExcl;
-    // ios is i defined as an octet string (the binary representation)
-    private byte[] ios;
-    private byte[] iv;
-    private boolean useCounter;
-
-    // operational
-    private int generatedBytes;
-    // k is used as buffer for all K(i) values
-    private byte[] k;
-
-
-    public KDFFeedbackBytesGenerator(Mac prf)
-    {
-        this.prf = prf;
-        this.h = prf.getMacSize();
-        this.k = new byte[h];
-    }
-
-    public void init(DerivationParameters params)
-    {
-        if (!(params instanceof KDFFeedbackParameters))
-        {
-            throw new IllegalArgumentException("Wrong type of arguments given");
-        }
-
-        KDFFeedbackParameters feedbackParams = (KDFFeedbackParameters)params;
-
-        // --- init mac based PRF ---
-
-        this.prf.init(new KeyParameter(feedbackParams.getKI()));
-
-        // --- set arguments ---
-
-        this.fixedInputData = feedbackParams.getFixedInputData();
-
-        int r = feedbackParams.getR();
-        this.ios = new byte[r / 8];
-
-        if (feedbackParams.useCounter())
-        {
-            // this is more conservative than the spec
-            BigInteger maxSize = TWO.pow(r).multiply(BigInteger.valueOf(h));
-            this.maxSizeExcl = maxSize.compareTo(INTEGER_MAX) == 1 ?
-                Integer.MAX_VALUE : maxSize.intValue();
-        }
-        else
-        {
-            this.maxSizeExcl = Integer.MAX_VALUE;
-        }
-
-        this.iv = feedbackParams.getIV();
-        this.useCounter = feedbackParams.useCounter();
-
-        // --- set operational state ---
-
-        generatedBytes = 0;
-    }
-
-    public Mac getMac()
-    {
-        return prf;
-    }
-
-    public int generateBytes(byte[] out, int outOff, int len)
-        throws DataLengthException, IllegalArgumentException
-    {
-
-        int generatedBytesAfter = generatedBytes + len;
-        if (generatedBytesAfter < 0 || generatedBytesAfter >= maxSizeExcl)
-        {
-            throw new DataLengthException(
-                "Current KDFCTR may only be used for " + maxSizeExcl + " bytes");
-        }
-
-        if (generatedBytes % h == 0)
-        {
-            generateNext();
-        }
-
-        // copy what is left in the currentT (1..hash
-        int toGenerate = len;
-        int posInK = generatedBytes % h;
-        int leftInK = h - generatedBytes % h;
-        int toCopy = Math.min(leftInK, toGenerate);
-        System.arraycopy(k, posInK, out, outOff, toCopy);
-        generatedBytes += toCopy;
-        toGenerate -= toCopy;
-        outOff += toCopy;
-
-        while (toGenerate > 0)
-        {
-            generateNext();
-            toCopy = Math.min(h, toGenerate);
-            System.arraycopy(k, 0, out, outOff, toCopy);
-            generatedBytes += toCopy;
-            toGenerate -= toCopy;
-            outOff += toCopy;
-        }
-
-        return len;
-    }
-
-    private void generateNext()
-    {
-
-        // TODO enable IV
-        if (generatedBytes == 0)
-        {
-            prf.update(iv, 0, iv.length);
-        }
-        else
-        {
-            prf.update(k, 0, k.length);
-        }
-
-        if (useCounter)
-        {
-            int i = generatedBytes / h + 1;
-
-            // encode i into counter buffer
-            switch (ios.length)
-            {
-            case 4:
-                ios[0] = (byte)(i >>> 24);
-                // fall through
-            case 3:
-                ios[ios.length - 3] = (byte)(i >>> 16);
-                // fall through
-            case 2:
-                ios[ios.length - 2] = (byte)(i >>> 8);
-                // fall through
-            case 1:
-                ios[ios.length - 1] = (byte)i;
-                break;
-            default:
-                throw new IllegalStateException("Unsupported size of counter i");
-            }
-            prf.update(ios, 0, ios.length);
-        }
-
-        prf.update(fixedInputData, 0, fixedInputData.length);
-        prf.doFinal(k, 0);
-    }
-}