diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/NoekeonEngine.java')
| -rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/NoekeonEngine.java | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/NoekeonEngine.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/NoekeonEngine.java deleted file mode 100644 index 3abaeedec..000000000 --- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/NoekeonEngine.java +++ /dev/null @@ -1,263 +0,0 @@ -package org.spongycastle.crypto.engines; - -import org.spongycastle.crypto.BlockCipher; -import org.spongycastle.crypto.CipherParameters; -import org.spongycastle.crypto.DataLengthException; -import org.spongycastle.crypto.OutputLengthException; -import org.spongycastle.crypto.params.KeyParameter; - -/** - * A Noekeon engine, using direct-key mode. - */ - -public class NoekeonEngine - implements BlockCipher -{ - private static final int genericSize = 16; // Block and key size, as well as the amount of rounds. - - private static final int[] nullVector = - { - 0x00, 0x00, 0x00, 0x00 // Used in decryption - }, - - roundConstants = - { - 0x80, 0x1b, 0x36, 0x6c, - 0xd8, 0xab, 0x4d, 0x9a, - 0x2f, 0x5e, 0xbc, 0x63, - 0xc6, 0x97, 0x35, 0x6a, - 0xd4 - }; - - private int[] state = new int[4], // a - subKeys = new int[4], // k - decryptKeys = new int[4]; - - private boolean _initialised, - _forEncryption; - - /** - * Create an instance of the Noekeon encryption algorithm - * and set some defaults - */ - public NoekeonEngine() - { - _initialised = false; - } - - public String getAlgorithmName() - { - return "Noekeon"; - } - - public int getBlockSize() - { - return genericSize; - } - - /** - * 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 Noekeon 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 + genericSize) > in.length) - { - throw new DataLengthException("input buffer too short"); - } - - if ((outOff + genericSize) > 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) - { - subKeys[0] = bytesToIntBig(key, 0); - subKeys[1] = bytesToIntBig(key, 4); - subKeys[2] = bytesToIntBig(key, 8); - subKeys[3] = bytesToIntBig(key, 12); - } - - private int encryptBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - state[0] = bytesToIntBig(in, inOff); - state[1] = bytesToIntBig(in, inOff+4); - state[2] = bytesToIntBig(in, inOff+8); - state[3] = bytesToIntBig(in, inOff+12); - - int i; - for (i = 0; i < genericSize; i++) - { - state[0] ^= roundConstants[i]; - theta(state, subKeys); - pi1(state); - gamma(state); - pi2(state); - } - - state[0] ^= roundConstants[i]; - theta(state, subKeys); - - intToBytesBig(state[0], out, outOff); - intToBytesBig(state[1], out, outOff+4); - intToBytesBig(state[2], out, outOff+8); - intToBytesBig(state[3], out, outOff+12); - - return genericSize; - } - - private int decryptBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - state[0] = bytesToIntBig(in, inOff); - state[1] = bytesToIntBig(in, inOff+4); - state[2] = bytesToIntBig(in, inOff+8); - state[3] = bytesToIntBig(in, inOff+12); - - System.arraycopy(subKeys, 0, decryptKeys, 0, subKeys.length); - theta(decryptKeys, nullVector); - - int i; - for (i = genericSize; i > 0; i--) - { - theta(state, decryptKeys); - state[0] ^= roundConstants[i]; - pi1(state); - gamma(state); - pi2(state); - } - - theta(state, decryptKeys); - state[0] ^= roundConstants[i]; - - intToBytesBig(state[0], out, outOff); - intToBytesBig(state[1], out, outOff+4); - intToBytesBig(state[2], out, outOff+8); - intToBytesBig(state[3], out, outOff+12); - - return genericSize; - } - - private void gamma(int[] a) - { - a[1] ^= ~a[3] & ~a[2]; - a[0] ^= a[2] & a[1]; - - int tmp = a[3]; - a[3] = a[0]; - a[0] = tmp; - a[2] ^= a[0]^a[1]^a[3]; - - a[1] ^= ~a[3] & ~a[2]; - a[0] ^= a[2] & a[1]; - } - - private void theta(int[] a, int[] k) - { - int tmp; - - tmp = a[0]^a[2]; - tmp ^= rotl(tmp,8)^rotl(tmp,24); - a[1] ^= tmp; - a[3] ^= tmp; - - for (int i = 0; i < 4; i++) - { - a[i] ^= k[i]; - } - - tmp = a[1]^a[3]; - tmp ^= rotl(tmp,8)^rotl(tmp,24); - a[0] ^= tmp; - a[2] ^= tmp; - } - - private void pi1(int[] a) - { - a[1] = rotl(a[1], 1); - a[2] = rotl(a[2], 5); - a[3] = rotl(a[3], 2); - } - - private void pi2(int[] a) - { - a[1] = rotl(a[1], 31); - a[2] = rotl(a[2], 27); - a[3] = rotl(a[3], 30); - } - - // Helpers - - private int bytesToIntBig(byte[] in, int off) - { - return ((in[off++]) << 24) | - ((in[off++] & 0xff) << 16) | - ((in[off++] & 0xff) << 8) | - (in[off ] & 0xff); - } - - private void intToBytesBig(int x, byte[] out, int off) - { - out[off++] = (byte)(x >>> 24); - out[off++] = (byte)(x >>> 16); - out[off++] = (byte)(x >>> 8); - out[off ] = (byte)x; - } - - private int rotl(int x, int y) - { - return (x << y) | (x >>> (32-y)); - } -} |