diff options
Diffstat (limited to 'bcprov/src/main/java/org/bouncycastle/crypto/engines/SkipjackEngine.java')
-rw-r--r-- | bcprov/src/main/java/org/bouncycastle/crypto/engines/SkipjackEngine.java | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/engines/SkipjackEngine.java b/bcprov/src/main/java/org/bouncycastle/crypto/engines/SkipjackEngine.java deleted file mode 100644 index 1fac536..0000000 --- a/bcprov/src/main/java/org/bouncycastle/crypto/engines/SkipjackEngine.java +++ /dev/null @@ -1,260 +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; - -/** - * a class that provides a basic SKIPJACK engine. - */ -public class SkipjackEngine - implements BlockCipher -{ - static final int BLOCK_SIZE = 8; - - static short ftable[] = - { - 0xa3, 0xd7, 0x09, 0x83, 0xf8, 0x48, 0xf6, 0xf4, 0xb3, 0x21, 0x15, 0x78, 0x99, 0xb1, 0xaf, 0xf9, - 0xe7, 0x2d, 0x4d, 0x8a, 0xce, 0x4c, 0xca, 0x2e, 0x52, 0x95, 0xd9, 0x1e, 0x4e, 0x38, 0x44, 0x28, - 0x0a, 0xdf, 0x02, 0xa0, 0x17, 0xf1, 0x60, 0x68, 0x12, 0xb7, 0x7a, 0xc3, 0xe9, 0xfa, 0x3d, 0x53, - 0x96, 0x84, 0x6b, 0xba, 0xf2, 0x63, 0x9a, 0x19, 0x7c, 0xae, 0xe5, 0xf5, 0xf7, 0x16, 0x6a, 0xa2, - 0x39, 0xb6, 0x7b, 0x0f, 0xc1, 0x93, 0x81, 0x1b, 0xee, 0xb4, 0x1a, 0xea, 0xd0, 0x91, 0x2f, 0xb8, - 0x55, 0xb9, 0xda, 0x85, 0x3f, 0x41, 0xbf, 0xe0, 0x5a, 0x58, 0x80, 0x5f, 0x66, 0x0b, 0xd8, 0x90, - 0x35, 0xd5, 0xc0, 0xa7, 0x33, 0x06, 0x65, 0x69, 0x45, 0x00, 0x94, 0x56, 0x6d, 0x98, 0x9b, 0x76, - 0x97, 0xfc, 0xb2, 0xc2, 0xb0, 0xfe, 0xdb, 0x20, 0xe1, 0xeb, 0xd6, 0xe4, 0xdd, 0x47, 0x4a, 0x1d, - 0x42, 0xed, 0x9e, 0x6e, 0x49, 0x3c, 0xcd, 0x43, 0x27, 0xd2, 0x07, 0xd4, 0xde, 0xc7, 0x67, 0x18, - 0x89, 0xcb, 0x30, 0x1f, 0x8d, 0xc6, 0x8f, 0xaa, 0xc8, 0x74, 0xdc, 0xc9, 0x5d, 0x5c, 0x31, 0xa4, - 0x70, 0x88, 0x61, 0x2c, 0x9f, 0x0d, 0x2b, 0x87, 0x50, 0x82, 0x54, 0x64, 0x26, 0x7d, 0x03, 0x40, - 0x34, 0x4b, 0x1c, 0x73, 0xd1, 0xc4, 0xfd, 0x3b, 0xcc, 0xfb, 0x7f, 0xab, 0xe6, 0x3e, 0x5b, 0xa5, - 0xad, 0x04, 0x23, 0x9c, 0x14, 0x51, 0x22, 0xf0, 0x29, 0x79, 0x71, 0x7e, 0xff, 0x8c, 0x0e, 0xe2, - 0x0c, 0xef, 0xbc, 0x72, 0x75, 0x6f, 0x37, 0xa1, 0xec, 0xd3, 0x8e, 0x62, 0x8b, 0x86, 0x10, 0xe8, - 0x08, 0x77, 0x11, 0xbe, 0x92, 0x4f, 0x24, 0xc5, 0x32, 0x36, 0x9d, 0xcf, 0xf3, 0xa6, 0xbb, 0xac, - 0x5e, 0x6c, 0xa9, 0x13, 0x57, 0x25, 0xb5, 0xe3, 0xbd, 0xa8, 0x3a, 0x01, 0x05, 0x59, 0x2a, 0x46 - }; - - private int[] key0, key1, key2, key3; - private boolean encrypting; - - /** - * initialise a SKIPJACK cipher. - * - * @param encrypting 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 encrypting, - CipherParameters params) - { - if (!(params instanceof KeyParameter)) - { - throw new IllegalArgumentException("invalid parameter passed to SKIPJACK init - " + params.getClass().getName()); - } - - byte[] keyBytes = ((KeyParameter)params).getKey(); - - this.encrypting = encrypting; - this.key0 = new int[32]; - this.key1 = new int[32]; - this.key2 = new int[32]; - this.key3 = new int[32]; - - // - // expand the key to 128 bytes in 4 parts (saving us a modulo, multiply - // and an addition). - // - for (int i = 0; i < 32; i ++) - { - key0[i] = keyBytes[(i * 4) % 10] & 0xff; - key1[i] = keyBytes[(i * 4 + 1) % 10] & 0xff; - key2[i] = keyBytes[(i * 4 + 2) % 10] & 0xff; - key3[i] = keyBytes[(i * 4 + 3) % 10] & 0xff; - } - } - - public String getAlgorithmName() - { - return "SKIPJACK"; - } - - public int getBlockSize() - { - return BLOCK_SIZE; - } - - public int processBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - if (key1 == null) - { - throw new IllegalStateException("SKIPJACK engine 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"); - } - - if (encrypting) - { - encryptBlock(in, inOff, out, outOff); - } - else - { - decryptBlock(in, inOff, out, outOff); - } - - return BLOCK_SIZE; - } - - public void reset() - { - } - - /** - * The G permutation - */ - private int g( - int k, - int w) - { - int g1, g2, g3, g4, g5, g6; - - g1 = (w >> 8) & 0xff; - g2 = w & 0xff; - - g3 = ftable[g2 ^ key0[k]] ^ g1; - g4 = ftable[g3 ^ key1[k]] ^ g2; - g5 = ftable[g4 ^ key2[k]] ^ g3; - g6 = ftable[g5 ^ key3[k]] ^ g4; - - return ((g5 << 8) + g6); - } - - public int encryptBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - int w1 = (in[inOff + 0] << 8) + (in[inOff + 1] & 0xff); - int w2 = (in[inOff + 2] << 8) + (in[inOff + 3] & 0xff); - int w3 = (in[inOff + 4] << 8) + (in[inOff + 5] & 0xff); - int w4 = (in[inOff + 6] << 8) + (in[inOff + 7] & 0xff); - - int k = 0; - - for (int t = 0; t < 2; t++) - { - for(int i = 0; i < 8; i++) - { - int tmp = w4; - w4 = w3; - w3 = w2; - w2 = g(k, w1); - w1 = w2 ^ tmp ^ (k + 1); - k++; - } - - for(int i = 0; i < 8; i++) - { - int tmp = w4; - w4 = w3; - w3 = w1 ^ w2 ^ (k + 1); - w2 = g(k, w1); - w1 = tmp; - k++; - } - } - - out[outOff + 0] = (byte)((w1 >> 8)); - out[outOff + 1] = (byte)(w1); - out[outOff + 2] = (byte)((w2 >> 8)); - out[outOff + 3] = (byte)(w2); - out[outOff + 4] = (byte)((w3 >> 8)); - out[outOff + 5] = (byte)(w3); - out[outOff + 6] = (byte)((w4 >> 8)); - out[outOff + 7] = (byte)(w4); - - return BLOCK_SIZE; - } - - /** - * the inverse of the G permutation. - */ - private int h( - int k, - int w) - { - int h1, h2, h3, h4, h5, h6; - - h1 = w & 0xff; - h2 = (w >> 8) & 0xff; - - h3 = ftable[h2 ^ key3[k]] ^ h1; - h4 = ftable[h3 ^ key2[k]] ^ h2; - h5 = ftable[h4 ^ key1[k]] ^ h3; - h6 = ftable[h5 ^ key0[k]] ^ h4; - - return ((h6 << 8) + h5); - } - - public int decryptBlock( - byte[] in, - int inOff, - byte[] out, - int outOff) - { - int w2 = (in[inOff + 0] << 8) + (in[inOff + 1] & 0xff); - int w1 = (in[inOff + 2] << 8) + (in[inOff + 3] & 0xff); - int w4 = (in[inOff + 4] << 8) + (in[inOff + 5] & 0xff); - int w3 = (in[inOff + 6] << 8) + (in[inOff + 7] & 0xff); - - int k = 31; - - for (int t = 0; t < 2; t++) - { - for(int i = 0; i < 8; i++) - { - int tmp = w4; - w4 = w3; - w3 = w2; - w2 = h(k, w1); - w1 = w2 ^ tmp ^ (k + 1); - k--; - } - - for(int i = 0; i < 8; i++) - { - int tmp = w4; - w4 = w3; - w3 = w1 ^ w2 ^ (k + 1); - w2 = h(k, w1); - w1 = tmp; - k--; - } - } - - out[outOff + 0] = (byte)((w2 >> 8)); - out[outOff + 1] = (byte)(w2); - out[outOff + 2] = (byte)((w1 >> 8)); - out[outOff + 3] = (byte)(w1); - out[outOff + 4] = (byte)((w4 >> 8)); - out[outOff + 5] = (byte)(w4); - out[outOff + 6] = (byte)((w3 >> 8)); - out[outOff + 7] = (byte)(w3); - - return BLOCK_SIZE; - } -} |