| 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; |
| import org.bouncycastle.util.Pack; |
| |
| /** |
| * a class that provides a basic DES engine. |
| */ |
| public class DESEngine |
| implements BlockCipher |
| { |
| protected static final int BLOCK_SIZE = 8; |
| |
| private int[] workingKey = null; |
| |
| /** |
| * standard constructor. |
| */ |
| public DESEngine() |
| { |
| } |
| |
| /** |
| * initialise a DES 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) |
| { |
| if (((KeyParameter)params).getKey().length > 8) |
| { |
| throw new IllegalArgumentException("DES key too long - should be 8 bytes"); |
| } |
| |
| workingKey = generateWorkingKey(encrypting, |
| ((KeyParameter)params).getKey()); |
| |
| return; |
| } |
| |
| throw new IllegalArgumentException("invalid parameter passed to DES init - " + params.getClass().getName()); |
| } |
| |
| public String getAlgorithmName() |
| { |
| return "DES"; |
| } |
| |
| public int getBlockSize() |
| { |
| return BLOCK_SIZE; |
| } |
| |
| public int processBlock( |
| byte[] in, |
| int inOff, |
| byte[] out, |
| int outOff) |
| { |
| if (workingKey == null) |
| { |
| throw new IllegalStateException("DES 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"); |
| } |
| |
| desFunc(workingKey, in, inOff, out, outOff); |
| |
| return BLOCK_SIZE; |
| } |
| |
| public void reset() |
| { |
| } |
| |
| /** |
| * what follows is mainly taken from "Applied Cryptography", by |
| * Bruce Schneier, however it also bears great resemblance to Richard |
| * Outerbridge's D3DES... |
| */ |
| |
| // private static final short[] Df_Key = |
| // { |
| // 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef, |
| // 0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10, |
| // 0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67 |
| // }; |
| |
| private static final short[] bytebit = |
| { |
| 0200, 0100, 040, 020, 010, 04, 02, 01 |
| }; |
| |
| private static final int[] bigbyte = |
| { |
| 0x800000, 0x400000, 0x200000, 0x100000, |
| 0x80000, 0x40000, 0x20000, 0x10000, |
| 0x8000, 0x4000, 0x2000, 0x1000, |
| 0x800, 0x400, 0x200, 0x100, |
| 0x80, 0x40, 0x20, 0x10, |
| 0x8, 0x4, 0x2, 0x1 |
| }; |
| |
| /* |
| * Use the key schedule specified in the Standard (ANSI X3.92-1981). |
| */ |
| |
| private static final byte[] pc1 = |
| { |
| 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, |
| 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, |
| 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, |
| 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 |
| }; |
| |
| private static final byte[] totrot = |
| { |
| 1, 2, 4, 6, 8, 10, 12, 14, |
| 15, 17, 19, 21, 23, 25, 27, 28 |
| }; |
| |
| private static final byte[] pc2 = |
| { |
| 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, |
| 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, |
| 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, |
| 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 |
| }; |
| |
| private static final int[] SP1 = { |
| 0x01010400, 0x00000000, 0x00010000, 0x01010404, |
| 0x01010004, 0x00010404, 0x00000004, 0x00010000, |
| 0x00000400, 0x01010400, 0x01010404, 0x00000400, |
| 0x01000404, 0x01010004, 0x01000000, 0x00000004, |
| 0x00000404, 0x01000400, 0x01000400, 0x00010400, |
| 0x00010400, 0x01010000, 0x01010000, 0x01000404, |
| 0x00010004, 0x01000004, 0x01000004, 0x00010004, |
| 0x00000000, 0x00000404, 0x00010404, 0x01000000, |
| 0x00010000, 0x01010404, 0x00000004, 0x01010000, |
| 0x01010400, 0x01000000, 0x01000000, 0x00000400, |
| 0x01010004, 0x00010000, 0x00010400, 0x01000004, |
| 0x00000400, 0x00000004, 0x01000404, 0x00010404, |
| 0x01010404, 0x00010004, 0x01010000, 0x01000404, |
| 0x01000004, 0x00000404, 0x00010404, 0x01010400, |
| 0x00000404, 0x01000400, 0x01000400, 0x00000000, |
| 0x00010004, 0x00010400, 0x00000000, 0x01010004 |
| }; |
| |
| private static final int[] SP2 = { |
| 0x80108020, 0x80008000, 0x00008000, 0x00108020, |
| 0x00100000, 0x00000020, 0x80100020, 0x80008020, |
| 0x80000020, 0x80108020, 0x80108000, 0x80000000, |
| 0x80008000, 0x00100000, 0x00000020, 0x80100020, |
| 0x00108000, 0x00100020, 0x80008020, 0x00000000, |
| 0x80000000, 0x00008000, 0x00108020, 0x80100000, |
| 0x00100020, 0x80000020, 0x00000000, 0x00108000, |
| 0x00008020, 0x80108000, 0x80100000, 0x00008020, |
| 0x00000000, 0x00108020, 0x80100020, 0x00100000, |
| 0x80008020, 0x80100000, 0x80108000, 0x00008000, |
| 0x80100000, 0x80008000, 0x00000020, 0x80108020, |
| 0x00108020, 0x00000020, 0x00008000, 0x80000000, |
| 0x00008020, 0x80108000, 0x00100000, 0x80000020, |
| 0x00100020, 0x80008020, 0x80000020, 0x00100020, |
| 0x00108000, 0x00000000, 0x80008000, 0x00008020, |
| 0x80000000, 0x80100020, 0x80108020, 0x00108000 |
| }; |
| |
| private static final int[] SP3 = { |
| 0x00000208, 0x08020200, 0x00000000, 0x08020008, |
| 0x08000200, 0x00000000, 0x00020208, 0x08000200, |
| 0x00020008, 0x08000008, 0x08000008, 0x00020000, |
| 0x08020208, 0x00020008, 0x08020000, 0x00000208, |
| 0x08000000, 0x00000008, 0x08020200, 0x00000200, |
| 0x00020200, 0x08020000, 0x08020008, 0x00020208, |
| 0x08000208, 0x00020200, 0x00020000, 0x08000208, |
| 0x00000008, 0x08020208, 0x00000200, 0x08000000, |
| 0x08020200, 0x08000000, 0x00020008, 0x00000208, |
| 0x00020000, 0x08020200, 0x08000200, 0x00000000, |
| 0x00000200, 0x00020008, 0x08020208, 0x08000200, |
| 0x08000008, 0x00000200, 0x00000000, 0x08020008, |
| 0x08000208, 0x00020000, 0x08000000, 0x08020208, |
| 0x00000008, 0x00020208, 0x00020200, 0x08000008, |
| 0x08020000, 0x08000208, 0x00000208, 0x08020000, |
| 0x00020208, 0x00000008, 0x08020008, 0x00020200 |
| }; |
| |
| private static final int[] SP4 = { |
| 0x00802001, 0x00002081, 0x00002081, 0x00000080, |
| 0x00802080, 0x00800081, 0x00800001, 0x00002001, |
| 0x00000000, 0x00802000, 0x00802000, 0x00802081, |
| 0x00000081, 0x00000000, 0x00800080, 0x00800001, |
| 0x00000001, 0x00002000, 0x00800000, 0x00802001, |
| 0x00000080, 0x00800000, 0x00002001, 0x00002080, |
| 0x00800081, 0x00000001, 0x00002080, 0x00800080, |
| 0x00002000, 0x00802080, 0x00802081, 0x00000081, |
| 0x00800080, 0x00800001, 0x00802000, 0x00802081, |
| 0x00000081, 0x00000000, 0x00000000, 0x00802000, |
| 0x00002080, 0x00800080, 0x00800081, 0x00000001, |
| 0x00802001, 0x00002081, 0x00002081, 0x00000080, |
| 0x00802081, 0x00000081, 0x00000001, 0x00002000, |
| 0x00800001, 0x00002001, 0x00802080, 0x00800081, |
| 0x00002001, 0x00002080, 0x00800000, 0x00802001, |
| 0x00000080, 0x00800000, 0x00002000, 0x00802080 |
| }; |
| |
| private static final int[] SP5 = { |
| 0x00000100, 0x02080100, 0x02080000, 0x42000100, |
| 0x00080000, 0x00000100, 0x40000000, 0x02080000, |
| 0x40080100, 0x00080000, 0x02000100, 0x40080100, |
| 0x42000100, 0x42080000, 0x00080100, 0x40000000, |
| 0x02000000, 0x40080000, 0x40080000, 0x00000000, |
| 0x40000100, 0x42080100, 0x42080100, 0x02000100, |
| 0x42080000, 0x40000100, 0x00000000, 0x42000000, |
| 0x02080100, 0x02000000, 0x42000000, 0x00080100, |
| 0x00080000, 0x42000100, 0x00000100, 0x02000000, |
| 0x40000000, 0x02080000, 0x42000100, 0x40080100, |
| 0x02000100, 0x40000000, 0x42080000, 0x02080100, |
| 0x40080100, 0x00000100, 0x02000000, 0x42080000, |
| 0x42080100, 0x00080100, 0x42000000, 0x42080100, |
| 0x02080000, 0x00000000, 0x40080000, 0x42000000, |
| 0x00080100, 0x02000100, 0x40000100, 0x00080000, |
| 0x00000000, 0x40080000, 0x02080100, 0x40000100 |
| }; |
| |
| private static final int[] SP6 = { |
| 0x20000010, 0x20400000, 0x00004000, 0x20404010, |
| 0x20400000, 0x00000010, 0x20404010, 0x00400000, |
| 0x20004000, 0x00404010, 0x00400000, 0x20000010, |
| 0x00400010, 0x20004000, 0x20000000, 0x00004010, |
| 0x00000000, 0x00400010, 0x20004010, 0x00004000, |
| 0x00404000, 0x20004010, 0x00000010, 0x20400010, |
| 0x20400010, 0x00000000, 0x00404010, 0x20404000, |
| 0x00004010, 0x00404000, 0x20404000, 0x20000000, |
| 0x20004000, 0x00000010, 0x20400010, 0x00404000, |
| 0x20404010, 0x00400000, 0x00004010, 0x20000010, |
| 0x00400000, 0x20004000, 0x20000000, 0x00004010, |
| 0x20000010, 0x20404010, 0x00404000, 0x20400000, |
| 0x00404010, 0x20404000, 0x00000000, 0x20400010, |
| 0x00000010, 0x00004000, 0x20400000, 0x00404010, |
| 0x00004000, 0x00400010, 0x20004010, 0x00000000, |
| 0x20404000, 0x20000000, 0x00400010, 0x20004010 |
| }; |
| |
| private static final int[] SP7 = { |
| 0x00200000, 0x04200002, 0x04000802, 0x00000000, |
| 0x00000800, 0x04000802, 0x00200802, 0x04200800, |
| 0x04200802, 0x00200000, 0x00000000, 0x04000002, |
| 0x00000002, 0x04000000, 0x04200002, 0x00000802, |
| 0x04000800, 0x00200802, 0x00200002, 0x04000800, |
| 0x04000002, 0x04200000, 0x04200800, 0x00200002, |
| 0x04200000, 0x00000800, 0x00000802, 0x04200802, |
| 0x00200800, 0x00000002, 0x04000000, 0x00200800, |
| 0x04000000, 0x00200800, 0x00200000, 0x04000802, |
| 0x04000802, 0x04200002, 0x04200002, 0x00000002, |
| 0x00200002, 0x04000000, 0x04000800, 0x00200000, |
| 0x04200800, 0x00000802, 0x00200802, 0x04200800, |
| 0x00000802, 0x04000002, 0x04200802, 0x04200000, |
| 0x00200800, 0x00000000, 0x00000002, 0x04200802, |
| 0x00000000, 0x00200802, 0x04200000, 0x00000800, |
| 0x04000002, 0x04000800, 0x00000800, 0x00200002 |
| }; |
| |
| private static final int[] SP8 = { |
| 0x10001040, 0x00001000, 0x00040000, 0x10041040, |
| 0x10000000, 0x10001040, 0x00000040, 0x10000000, |
| 0x00040040, 0x10040000, 0x10041040, 0x00041000, |
| 0x10041000, 0x00041040, 0x00001000, 0x00000040, |
| 0x10040000, 0x10000040, 0x10001000, 0x00001040, |
| 0x00041000, 0x00040040, 0x10040040, 0x10041000, |
| 0x00001040, 0x00000000, 0x00000000, 0x10040040, |
| 0x10000040, 0x10001000, 0x00041040, 0x00040000, |
| 0x00041040, 0x00040000, 0x10041000, 0x00001000, |
| 0x00000040, 0x10040040, 0x00001000, 0x00041040, |
| 0x10001000, 0x00000040, 0x10000040, 0x10040000, |
| 0x10040040, 0x10000000, 0x00040000, 0x10001040, |
| 0x00000000, 0x10041040, 0x00040040, 0x10000040, |
| 0x10040000, 0x10001000, 0x10001040, 0x00000000, |
| 0x10041040, 0x00041000, 0x00041000, 0x00001040, |
| 0x00001040, 0x00040040, 0x10000000, 0x10041000 |
| }; |
| |
| /** |
| * generate an integer based working key based on our secret key |
| * and what we processing we are planning to do. |
| * |
| * Acknowledgements for this routine go to James Gillogly & Phil Karn. |
| * (whoever, and wherever they are!). |
| */ |
| protected int[] generateWorkingKey( |
| boolean encrypting, |
| byte[] key) |
| { |
| int[] newKey = new int[32]; |
| boolean[] pc1m = new boolean[56], |
| pcr = new boolean[56]; |
| |
| for (int j = 0; j < 56; j++) |
| { |
| int l = pc1[j]; |
| |
| pc1m[j] = ((key[l >>> 3] & bytebit[l & 07]) != 0); |
| } |
| |
| for (int i = 0; i < 16; i++) |
| { |
| int l, m, n; |
| |
| if (encrypting) |
| { |
| m = i << 1; |
| } |
| else |
| { |
| m = (15 - i) << 1; |
| } |
| |
| n = m + 1; |
| newKey[m] = newKey[n] = 0; |
| |
| for (int j = 0; j < 28; j++) |
| { |
| l = j + totrot[i]; |
| if (l < 28) |
| { |
| pcr[j] = pc1m[l]; |
| } |
| else |
| { |
| pcr[j] = pc1m[l - 28]; |
| } |
| } |
| |
| for (int j = 28; j < 56; j++) |
| { |
| l = j + totrot[i]; |
| if (l < 56) |
| { |
| pcr[j] = pc1m[l]; |
| } |
| else |
| { |
| pcr[j] = pc1m[l - 28]; |
| } |
| } |
| |
| for (int j = 0; j < 24; j++) |
| { |
| if (pcr[pc2[j]]) |
| { |
| newKey[m] |= bigbyte[j]; |
| } |
| |
| if (pcr[pc2[j + 24]]) |
| { |
| newKey[n] |= bigbyte[j]; |
| } |
| } |
| } |
| |
| // |
| // store the processed key |
| // |
| for (int i = 0; i != 32; i += 2) |
| { |
| int i1, i2; |
| |
| i1 = newKey[i]; |
| i2 = newKey[i + 1]; |
| |
| newKey[i] = ((i1 & 0x00fc0000) << 6) | ((i1 & 0x00000fc0) << 10) |
| | ((i2 & 0x00fc0000) >>> 10) | ((i2 & 0x00000fc0) >>> 6); |
| |
| newKey[i + 1] = ((i1 & 0x0003f000) << 12) | ((i1 & 0x0000003f) << 16) |
| | ((i2 & 0x0003f000) >>> 4) | (i2 & 0x0000003f); |
| } |
| |
| return newKey; |
| } |
| |
| /** |
| * the DES engine. |
| */ |
| protected void desFunc( |
| int[] wKey, |
| byte[] in, |
| int inOff, |
| byte[] out, |
| int outOff) |
| { |
| int work, right, left; |
| |
| left = Pack.bigEndianToInt(in, inOff); |
| right = Pack.bigEndianToInt(in, inOff + 4); |
| |
| work = ((left >>> 4) ^ right) & 0x0f0f0f0f; |
| right ^= work; |
| left ^= (work << 4); |
| work = ((left >>> 16) ^ right) & 0x0000ffff; |
| right ^= work; |
| left ^= (work << 16); |
| work = ((right >>> 2) ^ left) & 0x33333333; |
| left ^= work; |
| right ^= (work << 2); |
| work = ((right >>> 8) ^ left) & 0x00ff00ff; |
| left ^= work; |
| right ^= (work << 8); |
| right = (right << 1) | (right >>> 31); |
| work = (left ^ right) & 0xaaaaaaaa; |
| left ^= work; |
| right ^= work; |
| left = (left << 1) | (left >>> 31); |
| |
| for (int round = 0; round < 8; round++) |
| { |
| int fval; |
| |
| work = (right << 28) | (right >>> 4); |
| work ^= wKey[round * 4 + 0]; |
| fval = SP7[ work & 0x3f]; |
| fval |= SP5[(work >>> 8) & 0x3f]; |
| fval |= SP3[(work >>> 16) & 0x3f]; |
| fval |= SP1[(work >>> 24) & 0x3f]; |
| work = right ^ wKey[round * 4 + 1]; |
| fval |= SP8[ work & 0x3f]; |
| fval |= SP6[(work >>> 8) & 0x3f]; |
| fval |= SP4[(work >>> 16) & 0x3f]; |
| fval |= SP2[(work >>> 24) & 0x3f]; |
| left ^= fval; |
| work = (left << 28) | (left >>> 4); |
| work ^= wKey[round * 4 + 2]; |
| fval = SP7[ work & 0x3f]; |
| fval |= SP5[(work >>> 8) & 0x3f]; |
| fval |= SP3[(work >>> 16) & 0x3f]; |
| fval |= SP1[(work >>> 24) & 0x3f]; |
| work = left ^ wKey[round * 4 + 3]; |
| fval |= SP8[ work & 0x3f]; |
| fval |= SP6[(work >>> 8) & 0x3f]; |
| fval |= SP4[(work >>> 16) & 0x3f]; |
| fval |= SP2[(work >>> 24) & 0x3f]; |
| right ^= fval; |
| } |
| |
| right = (right << 31) | (right >>> 1); |
| work = (left ^ right) & 0xaaaaaaaa; |
| left ^= work; |
| right ^= work; |
| left = (left << 31) | (left >>> 1); |
| work = ((left >>> 8) ^ right) & 0x00ff00ff; |
| right ^= work; |
| left ^= (work << 8); |
| work = ((left >>> 2) ^ right) & 0x33333333; |
| right ^= work; |
| left ^= (work << 2); |
| work = ((right >>> 16) ^ left) & 0x0000ffff; |
| left ^= work; |
| right ^= (work << 16); |
| work = ((right >>> 4) ^ left) & 0x0f0f0f0f; |
| left ^= work; |
| right ^= (work << 4); |
| |
| Pack.intToBigEndian(right, out, outOff); |
| Pack.intToBigEndian(left, out, outOff + 4); |
| } |
| } |
