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path: root/core/src/main/java/org/bouncycastle/crypto/engines/Grainv1Engine.java
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Diffstat (limited to 'core/src/main/java/org/bouncycastle/crypto/engines/Grainv1Engine.java')
-rw-r--r--core/src/main/java/org/bouncycastle/crypto/engines/Grainv1Engine.java290
1 files changed, 0 insertions, 290 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/engines/Grainv1Engine.java b/core/src/main/java/org/bouncycastle/crypto/engines/Grainv1Engine.java
deleted file mode 100644
index 77f52d1c..00000000
--- a/core/src/main/java/org/bouncycastle/crypto/engines/Grainv1Engine.java
+++ /dev/null
@@ -1,290 +0,0 @@
-package org.bouncycastle.crypto.engines;
-
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.OutputLengthException;
-import org.bouncycastle.crypto.StreamCipher;
-import org.bouncycastle.crypto.params.KeyParameter;
-import org.bouncycastle.crypto.params.ParametersWithIV;
-
-/**
- * Implementation of Martin Hell's, Thomas Johansson's and Willi Meier's stream
- * cipher, Grain v1.
- */
-public class Grainv1Engine
- implements StreamCipher
-{
-
- /**
- * Constants
- */
- private static final int STATE_SIZE = 5;
-
- /**
- * Variables to hold the state of the engine during encryption and
- * decryption
- */
- private byte[] workingKey;
- private byte[] workingIV;
- private byte[] out;
- private int[] lfsr;
- private int[] nfsr;
- private int output;
- private int index = 2;
-
- private boolean initialised = false;
-
- public String getAlgorithmName()
- {
- return "Grain v1";
- }
-
- /**
- * Initialize a Grain v1 cipher.
- *
- * @param forEncryption Whether or not we are for encryption.
- * @param params The parameters required to set up the cipher.
- * @throws IllegalArgumentException If the params argument is inappropriate.
- */
- public void init(boolean forEncryption, CipherParameters params)
- throws IllegalArgumentException
- {
- /**
- * Grain encryption and decryption is completely symmetrical, so the
- * 'forEncryption' is irrelevant.
- */
- if (!(params instanceof ParametersWithIV))
- {
- throw new IllegalArgumentException(
- "Grain v1 Init parameters must include an IV");
- }
-
- ParametersWithIV ivParams = (ParametersWithIV)params;
-
- byte[] iv = ivParams.getIV();
-
- if (iv == null || iv.length != 8)
- {
- throw new IllegalArgumentException(
- "Grain v1 requires exactly 8 bytes of IV");
- }
-
- if (!(ivParams.getParameters() instanceof KeyParameter))
- {
- throw new IllegalArgumentException(
- "Grain v1 Init parameters must include a key");
- }
-
- KeyParameter key = (KeyParameter)ivParams.getParameters();
-
- /**
- * Initialize variables.
- */
- workingIV = new byte[key.getKey().length];
- workingKey = new byte[key.getKey().length];
- lfsr = new int[STATE_SIZE];
- nfsr = new int[STATE_SIZE];
- out = new byte[2];
-
- System.arraycopy(iv, 0, workingIV, 0, iv.length);
- System.arraycopy(key.getKey(), 0, workingKey, 0, key.getKey().length);
-
- reset();
- }
-
- /**
- * 160 clocks initialization phase.
- */
- private void initGrain()
- {
- for (int i = 0; i < 10; i++)
- {
- output = getOutput();
- nfsr = shift(nfsr, getOutputNFSR() ^ lfsr[0] ^ output);
- lfsr = shift(lfsr, getOutputLFSR() ^ output);
- }
- initialised = true;
- }
-
- /**
- * Get output from non-linear function g(x).
- *
- * @return Output from NFSR.
- */
- private int getOutputNFSR()
- {
- int b0 = nfsr[0];
- int b9 = nfsr[0] >>> 9 | nfsr[1] << 7;
- int b14 = nfsr[0] >>> 14 | nfsr[1] << 2;
- int b15 = nfsr[0] >>> 15 | nfsr[1] << 1;
- int b21 = nfsr[1] >>> 5 | nfsr[2] << 11;
- int b28 = nfsr[1] >>> 12 | nfsr[2] << 4;
- int b33 = nfsr[2] >>> 1 | nfsr[3] << 15;
- int b37 = nfsr[2] >>> 5 | nfsr[3] << 11;
- int b45 = nfsr[2] >>> 13 | nfsr[3] << 3;
- int b52 = nfsr[3] >>> 4 | nfsr[4] << 12;
- int b60 = nfsr[3] >>> 12 | nfsr[4] << 4;
- int b62 = nfsr[3] >>> 14 | nfsr[4] << 2;
- int b63 = nfsr[3] >>> 15 | nfsr[4] << 1;
-
- return (b62 ^ b60 ^ b52 ^ b45 ^ b37 ^ b33 ^ b28 ^ b21 ^ b14
- ^ b9 ^ b0 ^ b63 & b60 ^ b37 & b33 ^ b15 & b9 ^ b60 & b52 & b45
- ^ b33 & b28 & b21 ^ b63 & b45 & b28 & b9 ^ b60 & b52 & b37
- & b33 ^ b63 & b60 & b21 & b15 ^ b63 & b60 & b52 & b45 & b37
- ^ b33 & b28 & b21 & b15 & b9 ^ b52 & b45 & b37 & b33 & b28
- & b21) & 0x0000FFFF;
- }
-
- /**
- * Get output from linear function f(x).
- *
- * @return Output from LFSR.
- */
- private int getOutputLFSR()
- {
- int s0 = lfsr[0];
- int s13 = lfsr[0] >>> 13 | lfsr[1] << 3;
- int s23 = lfsr[1] >>> 7 | lfsr[2] << 9;
- int s38 = lfsr[2] >>> 6 | lfsr[3] << 10;
- int s51 = lfsr[3] >>> 3 | lfsr[4] << 13;
- int s62 = lfsr[3] >>> 14 | lfsr[4] << 2;
-
- return (s0 ^ s13 ^ s23 ^ s38 ^ s51 ^ s62) & 0x0000FFFF;
- }
-
- /**
- * Get output from output function h(x).
- *
- * @return Output from h(x).
- */
- private int getOutput()
- {
- int b1 = nfsr[0] >>> 1 | nfsr[1] << 15;
- int b2 = nfsr[0] >>> 2 | nfsr[1] << 14;
- int b4 = nfsr[0] >>> 4 | nfsr[1] << 12;
- int b10 = nfsr[0] >>> 10 | nfsr[1] << 6;
- int b31 = nfsr[1] >>> 15 | nfsr[2] << 1;
- int b43 = nfsr[2] >>> 11 | nfsr[3] << 5;
- int b56 = nfsr[3] >>> 8 | nfsr[4] << 8;
- int b63 = nfsr[3] >>> 15 | nfsr[4] << 1;
- int s3 = lfsr[0] >>> 3 | lfsr[1] << 13;
- int s25 = lfsr[1] >>> 9 | lfsr[2] << 7;
- int s46 = lfsr[2] >>> 14 | lfsr[3] << 2;
- int s64 = lfsr[4];
-
- return (s25 ^ b63 ^ s3 & s64 ^ s46 & s64 ^ s64 & b63 ^ s3
- & s25 & s46 ^ s3 & s46 & s64 ^ s3 & s46 & b63 ^ s25 & s46 & b63 ^ s46
- & s64 & b63 ^ b1 ^ b2 ^ b4 ^ b10 ^ b31 ^ b43 ^ b56) & 0x0000FFFF;
- }
-
- /**
- * Shift array 16 bits and add val to index.length - 1.
- *
- * @param array The array to shift.
- * @param val The value to shift in.
- * @return The shifted array with val added to index.length - 1.
- */
- private int[] shift(int[] array, int val)
- {
- array[0] = array[1];
- array[1] = array[2];
- array[2] = array[3];
- array[3] = array[4];
- array[4] = val;
-
- return array;
- }
-
- /**
- * Set keys, reset cipher.
- *
- * @param keyBytes The key.
- * @param ivBytes The IV.
- */
- private void setKey(byte[] keyBytes, byte[] ivBytes)
- {
- ivBytes[8] = (byte)0xFF;
- ivBytes[9] = (byte)0xFF;
- workingKey = keyBytes;
- workingIV = ivBytes;
-
- /**
- * Load NFSR and LFSR
- */
- int j = 0;
- for (int i = 0; i < nfsr.length; i++)
- {
- nfsr[i] = (workingKey[j + 1] << 8 | workingKey[j] & 0xFF) & 0x0000FFFF;
- lfsr[i] = (workingIV[j + 1] << 8 | workingIV[j] & 0xFF) & 0x0000FFFF;
- j += 2;
- }
- }
-
- public int processBytes(byte[] in, int inOff, int len, byte[] out,
- int outOff)
- throws DataLengthException
- {
- if (!initialised)
- {
- throw new IllegalStateException(getAlgorithmName()
- + " not initialised");
- }
-
- if ((inOff + len) > in.length)
- {
- throw new DataLengthException("input buffer too short");
- }
-
- if ((outOff + len) > out.length)
- {
- throw new OutputLengthException("output buffer too short");
- }
-
- for (int i = 0; i < len; i++)
- {
- out[outOff + i] = (byte)(in[inOff + i] ^ getKeyStream());
- }
-
- return len;
- }
-
- public void reset()
- {
- index = 2;
- setKey(workingKey, workingIV);
- initGrain();
- }
-
- /**
- * Run Grain one round(i.e. 16 bits).
- */
- private void oneRound()
- {
- output = getOutput();
- out[0] = (byte)output;
- out[1] = (byte)(output >> 8);
-
- nfsr = shift(nfsr, getOutputNFSR() ^ lfsr[0]);
- lfsr = shift(lfsr, getOutputLFSR());
- }
-
- public byte returnByte(byte in)
- {
- if (!initialised)
- {
- throw new IllegalStateException(getAlgorithmName()
- + " not initialised");
- }
- return (byte)(in ^ getKeyStream());
- }
-
- private byte getKeyStream()
- {
- if (index > 1)
- {
- oneRound();
- index = 0;
- }
- return out[index++];
- }
-} \ No newline at end of file
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