1 files changed, 0 insertions, 386 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/TlsBlockCipher.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/TlsBlockCipher.java
deleted file mode 100644
index bb290c77c..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/TlsBlockCipher.java
+++ /dev/null
@@ -1,386 +0,0 @@
-package org.spongycastle.crypto.tls;
-
-import java.io.IOException;
-import java.security.SecureRandom;
-
-import org.spongycastle.crypto.BlockCipher;
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.Digest;
-import org.spongycastle.crypto.params.KeyParameter;
-import org.spongycastle.crypto.params.ParametersWithIV;
-import org.spongycastle.util.Arrays;
-
-/**
- * A generic TLS 1.0-1.1 / SSLv3 block cipher. This can be used for AES or 3DES for example.
- */
-public class TlsBlockCipher
-    implements TlsCipher
-{
-    private static boolean encryptThenMAC = false;
-
-    protected TlsContext context;
-    protected byte[] randomData;
-    protected boolean useExplicitIV;
-
-    protected BlockCipher encryptCipher;
-    protected BlockCipher decryptCipher;
-
-    protected TlsMac writeMac;
-    protected TlsMac readMac;
-
-    public TlsMac getWriteMac()
-    {
-        return writeMac;
-    }
-
-    public TlsMac getReadMac()
-    {
-        return readMac;
-    }
-
-    public TlsBlockCipher(TlsContext context, BlockCipher clientWriteCipher, BlockCipher serverWriteCipher,
-        Digest clientWriteDigest, Digest serverWriteDigest, int cipherKeySize) throws IOException
-    {
-        this.context = context;
-
-        this.randomData = new byte[256];
-        context.getSecureRandom().nextBytes(randomData);
-
-        this.useExplicitIV = TlsUtils.isTLSv11(context);
-
-        int key_block_size = (2 * cipherKeySize) + clientWriteDigest.getDigestSize()
-            + serverWriteDigest.getDigestSize();
-
-        // From TLS 1.1 onwards, block ciphers don't need client_write_IV
-        if (!useExplicitIV)
-        {
-            key_block_size += clientWriteCipher.getBlockSize() + serverWriteCipher.getBlockSize();
-        }
-
-        byte[] key_block = TlsUtils.calculateKeyBlock(context, key_block_size);
-
-        int offset = 0;
-
-        TlsMac clientWriteMac = new TlsMac(context, clientWriteDigest, key_block, offset,
-            clientWriteDigest.getDigestSize());
-        offset += clientWriteDigest.getDigestSize();
-        TlsMac serverWriteMac = new TlsMac(context, serverWriteDigest, key_block, offset,
-            serverWriteDigest.getDigestSize());
-        offset += serverWriteDigest.getDigestSize();
-
-        KeyParameter client_write_key = new KeyParameter(key_block, offset, cipherKeySize);
-        offset += cipherKeySize;
-        KeyParameter server_write_key = new KeyParameter(key_block, offset, cipherKeySize);
-        offset += cipherKeySize;
-
-        byte[] client_write_IV, server_write_IV;
-        if (useExplicitIV)
-        {
-            client_write_IV = new byte[clientWriteCipher.getBlockSize()];
-            server_write_IV = new byte[serverWriteCipher.getBlockSize()];
-        }
-        else
-        {
-            client_write_IV = Arrays.copyOfRange(key_block, offset, offset + clientWriteCipher.getBlockSize());
-            offset += clientWriteCipher.getBlockSize();
-            server_write_IV = Arrays.copyOfRange(key_block, offset, offset + serverWriteCipher.getBlockSize());
-            offset += serverWriteCipher.getBlockSize();
-        }
-
-        if (offset != key_block_size)
-        {
-            throw new TlsFatalAlert(AlertDescription.internal_error);
-        }
-
-        CipherParameters encryptParams, decryptParams;
-        if (context.isServer())
-        {
-            this.writeMac = serverWriteMac;
-            this.readMac = clientWriteMac;
-            this.encryptCipher = serverWriteCipher;
-            this.decryptCipher = clientWriteCipher;
-            encryptParams = new ParametersWithIV(server_write_key, server_write_IV);
-            decryptParams = new ParametersWithIV(client_write_key, client_write_IV);
-        }
-        else
-        {
-            this.writeMac = clientWriteMac;
-            this.readMac = serverWriteMac;
-            this.encryptCipher = clientWriteCipher;
-            this.decryptCipher = serverWriteCipher;
-            encryptParams = new ParametersWithIV(client_write_key, client_write_IV);
-            decryptParams = new ParametersWithIV(server_write_key, server_write_IV);
-        }
-
-        this.encryptCipher.init(true, encryptParams);
-        this.decryptCipher.init(false, decryptParams);
-    }
-
-    public int getPlaintextLimit(int ciphertextLimit)
-    {
-        int blockSize = encryptCipher.getBlockSize();
-        int macSize = writeMac.getSize();
-
-        int plaintextLimit = ciphertextLimit;
-
-        // An explicit IV consumes 1 block
-        if (useExplicitIV)
-        {
-            plaintextLimit -= blockSize;
-        }
-
-        // Leave room for the MAC, and require block-alignment
-        if (encryptThenMAC)
-        {
-            plaintextLimit -= macSize;
-            plaintextLimit -= plaintextLimit % blockSize;
-        }
-        else
-        {
-            plaintextLimit -= plaintextLimit % blockSize;
-            plaintextLimit -= macSize;
-        }
-
-        // Minimum 1 byte of padding
-        --plaintextLimit;
-
-        return plaintextLimit;
-    }
-
-    public byte[] encodePlaintext(long seqNo, short type, byte[] plaintext, int offset, int len)
-    {
-        int blockSize = encryptCipher.getBlockSize();
-        int macSize = writeMac.getSize();
-
-        ProtocolVersion version = context.getServerVersion();
-
-        int enc_input_length = len;
-        if (!encryptThenMAC)
-        {
-            enc_input_length += macSize;
-        }
-
-        int padding_length = blockSize - 1 - (enc_input_length % blockSize);
-
-        // TODO[DTLS] Consider supporting in DTLS (without exceeding send limit though)
-        if (!version.isDTLS() && !version.isSSL())
-        {
-            // Add a random number of extra blocks worth of padding
-            int maxExtraPadBlocks = (255 - padding_length) / blockSize;
-            int actualExtraPadBlocks = chooseExtraPadBlocks(context.getSecureRandom(), maxExtraPadBlocks);
-            padding_length += actualExtraPadBlocks * blockSize;
-        }
-
-        int totalSize = len + macSize + padding_length + 1;
-        if (useExplicitIV)
-        {
-            totalSize += blockSize;
-        }
-
-        byte[] outBuf = new byte[totalSize];
-        int outOff = 0;
-
-        if (useExplicitIV)
-        {
-            byte[] explicitIV = new byte[blockSize];
-            context.getSecureRandom().nextBytes(explicitIV);
-
-            encryptCipher.init(true, new ParametersWithIV(null, explicitIV));
-
-            System.arraycopy(explicitIV, 0, outBuf, outOff, blockSize);
-            outOff += blockSize;
-        }
-
-        int blocks_start = outOff;
-
-        System.arraycopy(plaintext, offset, outBuf, outOff, len);
-        outOff += len;
-
-        if (!encryptThenMAC)
-        {
-            byte[] mac = writeMac.calculateMac(seqNo, type, plaintext, offset, len);
-            System.arraycopy(mac, 0, outBuf, outOff, mac.length);
-            outOff += mac.length;
-        }
-
-        for (int i = 0; i <= padding_length; i++)
-        {
-            outBuf[outOff++] = (byte)padding_length;
-        }
-
-        for (int i = blocks_start; i < outOff; i += blockSize)
-        {
-            encryptCipher.processBlock(outBuf, i, outBuf, i);
-        }
-
-        if (encryptThenMAC)
-        {
-            byte[] mac = writeMac.calculateMac(seqNo, type, outBuf, 0, outOff);
-            System.arraycopy(mac, 0, outBuf, outOff, mac.length);
-            outOff += mac.length;
-        }
-
-//        assert outBuf.length == outOff;
-
-        return outBuf;
-    }
-
-    public byte[] decodeCiphertext(long seqNo, short type, byte[] ciphertext, int offset, int len)
-        throws IOException
-    {
-        int blockSize = decryptCipher.getBlockSize();
-        int macSize = readMac.getSize();
-
-        int minLen = blockSize;
-        if (encryptThenMAC)
-        {
-            minLen += macSize;
-        }
-        else
-        {
-            minLen = Math.max(minLen, macSize + 1);
-        }
-
-        if (useExplicitIV)
-        {
-            minLen += blockSize;
-        }
-
-        if (len < minLen)
-        {
-            throw new TlsFatalAlert(AlertDescription.decode_error);
-        }
-
-        int blocks_length = len;
-        if (encryptThenMAC)
-        {
-            blocks_length -= macSize;
-        }
-
-        if (blocks_length % blockSize != 0)
-        {
-            throw new TlsFatalAlert(AlertDescription.decryption_failed);
-        }
-
-        if (encryptThenMAC)
-        {
-            int end = offset + len;
-            byte[] receivedMac = Arrays.copyOfRange(ciphertext, end - macSize, end);
-            byte[] calculatedMac = readMac.calculateMac(seqNo, type, ciphertext, offset, len - macSize);
-
-            boolean badMac = !Arrays.constantTimeAreEqual(calculatedMac, receivedMac);
-
-            if (badMac)
-            {
-                throw new TlsFatalAlert(AlertDescription.bad_record_mac);
-            }
-        }
-
-        if (useExplicitIV)
-        {
-            decryptCipher.init(false, new ParametersWithIV(null, ciphertext, offset, blockSize));
-
-            offset += blockSize;
-            blocks_length -= blockSize;
-        }
-
-        for (int i = 0; i < blocks_length; i += blockSize)
-        {
-            decryptCipher.processBlock(ciphertext, offset + i, ciphertext, offset + i);
-        }
-
-        // If there's anything wrong with the padding, this will return zero
-        int totalPad = checkPaddingConstantTime(ciphertext, offset, blocks_length, blockSize, encryptThenMAC ? 0 : macSize);
-
-        int dec_output_length = blocks_length - totalPad;
-
-        if (!encryptThenMAC)
-        {
-            dec_output_length -= macSize;
-            int macInputLen = dec_output_length;
-            int macOff = offset + macInputLen;
-            byte[] receivedMac = Arrays.copyOfRange(ciphertext, macOff, macOff + macSize);
-            byte[] calculatedMac = readMac.calculateMacConstantTime(seqNo, type, ciphertext, offset, macInputLen,
-                blocks_length - macSize, randomData);
-
-            boolean badMac = !Arrays.constantTimeAreEqual(calculatedMac, receivedMac);
-
-            if (badMac || totalPad == 0)
-            {
-                throw new TlsFatalAlert(AlertDescription.bad_record_mac);
-            }
-        }
-
-        return Arrays.copyOfRange(ciphertext, offset, offset + dec_output_length);
-    }
-
-    protected int checkPaddingConstantTime(byte[] buf, int off, int len, int blockSize, int macSize)
-    {
-        int end = off + len;
-        byte lastByte = buf[end - 1];
-        int padlen = lastByte & 0xff;
-        int totalPad = padlen + 1;
-
-        int dummyIndex = 0;
-        byte padDiff = 0;
-
-        if ((TlsUtils.isSSL(context) && totalPad > blockSize) || (macSize + totalPad > len))
-        {
-            totalPad = 0;
-        }
-        else
-        {
-            int padPos = end - totalPad;
-            do
-            {
-                padDiff |= (buf[padPos++] ^ lastByte);
-            }
-            while (padPos < end);
-
-            dummyIndex = totalPad;
-
-            if (padDiff != 0)
-            {
-                totalPad = 0;
-            }
-        }
-
-        // Run some extra dummy checks so the number of checks is always constant
-        {
-            byte[] dummyPad = randomData;
-            while (dummyIndex < 256)
-            {
-                padDiff |= (dummyPad[dummyIndex++] ^ lastByte);
-            }
-            // Ensure the above loop is not eliminated
-            dummyPad[0] ^= padDiff;
-        }
-
-        return totalPad;
-    }
-
-    protected int chooseExtraPadBlocks(SecureRandom r, int max)
-    {
-        // return r.nextInt(max + 1);
-
-        int x = r.nextInt();
-        int n = lowestBitSet(x);
-        return Math.min(n, max);
-    }
-
-    protected int lowestBitSet(int x)
-    {
-        if (x == 0)
-        {
-            return 32;
-        }
-
-        int n = 0;
-        while ((x & 1) == 0)
-        {
-            ++n;
-            x >>= 1;
-        }
-        return n;
-    }
-}