diff options
author | Roberto Tyley <roberto.tyley@gmail.com> | 2014-07-15 01:38:01 +0400 |
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committer | Roberto Tyley <roberto.tyley@gmail.com> | 2014-07-26 11:23:17 +0400 |
commit | 7cb752aaf746dc0b473afeb9e892b7fbc12666c5 (patch) | |
tree | cc4f91ddc18332b5adbe82e3fcb040d976c90105 /core/src/main/java/org/bouncycastle/crypto/engines/XTEAEngine.java | |
parent | 551830f8ea5177042af2c7dd1fc90888bc67387d (diff) |
Execute become-spongy.sh
https://github.com/rtyley/spongycastle/blob/3040af/become-spongy.sh
Diffstat (limited to 'core/src/main/java/org/bouncycastle/crypto/engines/XTEAEngine.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/crypto/engines/XTEAEngine.java | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/engines/XTEAEngine.java b/core/src/main/java/org/bouncycastle/crypto/engines/XTEAEngine.java deleted file mode 100644 index fb21bbc2..00000000 --- a/core/src/main/java/org/bouncycastle/crypto/engines/XTEAEngine.java +++ /dev/null @@ -1,188 +0,0 @@ -package org.bouncycastle.crypto.engines; - -import org.bouncycastle.crypto.BlockCipher; -import org.bouncycastle.crypto.CipherParameters; -import org.bouncycastle.crypto.DataLengthException; -import org.bouncycastle.crypto.OutputLengthException; -import org.bouncycastle.crypto.params.KeyParameter; - -/** - * An XTEA engine. - */ -public class XTEAEngine - implements BlockCipher -{ - private static final int rounds = 32, - block_size = 8, -// key_size = 16, - delta = 0x9E3779B9; - - /* - * the expanded key array of 4 subkeys - */ - private int[] _S = new int[4], - _sum0 = new int[32], - _sum1 = new int[32]; - private boolean _initialised, - _forEncryption; - - /** - * Create an instance of the TEA encryption algorithm - * and set some defaults - */ - public XTEAEngine() - { - _initialised = false; - } - - public String getAlgorithmName() - { - return "XTEA"; - } - - public int getBlockSize() - { - return block_size; - } - - /** - * initialise - * - * @param forEncryption whether or not we are for encryption. - * @param params the parameters required to set up the cipher. - * @exception IllegalArgumentException if the params argument is - * inappropriate. - */ - public void init( - boolean forEncryption, - CipherParameters params) - { - if (!(params instanceof KeyParameter)) - { - throw new IllegalArgumentException("invalid parameter passed to TEA init - " + params.getClass().getName()); - } - - _forEncryption = forEncryption; - _initialised = true; - - KeyParameter p = (KeyParameter)params; - - setKey(p.getKey()); - } - - public int processBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - if (!_initialised) - { - throw new IllegalStateException(getAlgorithmName()+" not initialised"); - } - - if ((inOff + block_size) > in.length) - { - throw new DataLengthException("input buffer too short"); - } - - if ((outOff + block_size) > out.length) - { - throw new OutputLengthException("output buffer too short"); - } - - return (_forEncryption) ? encryptBlock(in, inOff, out, outOff) - : decryptBlock(in, inOff, out, outOff); - } - - public void reset() - { - } - - /** - * Re-key the cipher. - * <p> - * @param key the key to be used - */ - private void setKey( - byte[] key) - { - if (key.length != 16) - { - throw new IllegalArgumentException("Key size must be 128 bits."); - } - - int i, j; - for (i = j = 0; i < 4; i++,j+=4) - { - _S[i] = bytesToInt(key, j); - } - - for (i = j = 0; i < rounds; i++) - { - _sum0[i] = (j + _S[j & 3]); - j += delta; - _sum1[i] = (j + _S[j >>> 11 & 3]); - } - } - - private int encryptBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - // Pack bytes into integers - int v0 = bytesToInt(in, inOff); - int v1 = bytesToInt(in, inOff + 4); - - for (int i = 0; i < rounds; i++) - { - v0 += ((v1 << 4 ^ v1 >>> 5) + v1) ^ _sum0[i]; - v1 += ((v0 << 4 ^ v0 >>> 5) + v0) ^ _sum1[i]; - } - - unpackInt(v0, out, outOff); - unpackInt(v1, out, outOff + 4); - - return block_size; - } - - private int decryptBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - // Pack bytes into integers - int v0 = bytesToInt(in, inOff); - int v1 = bytesToInt(in, inOff + 4); - - for (int i = rounds-1; i >= 0; i--) - { - v1 -= ((v0 << 4 ^ v0 >>> 5) + v0) ^ _sum1[i]; - v0 -= ((v1 << 4 ^ v1 >>> 5) + v1) ^ _sum0[i]; - } - - unpackInt(v0, out, outOff); - unpackInt(v1, out, outOff + 4); - - return block_size; - } - - private int bytesToInt(byte[] in, int inOff) - { - return ((in[inOff++]) << 24) | - ((in[inOff++] & 255) << 16) | - ((in[inOff++] & 255) << 8) | - ((in[inOff] & 255)); - } - - private void unpackInt(int v, byte[] out, int outOff) - { - out[outOff++] = (byte)(v >>> 24); - out[outOff++] = (byte)(v >>> 16); - out[outOff++] = (byte)(v >>> 8); - out[outOff ] = (byte)v; - } -} |