?? aesengine.java
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int KC = key.length / 4; // key length in words int t; if (((KC != 4) && (KC != 6) && (KC != 8)) || ((KC * 4) != key.length)) { throw new IllegalArgumentException("Key length not 128/192/256 bits."); } ROUNDS = KC + 6; // This is not always true for the generalized Rijndael that allows larger block sizes int[][] W = new int[ROUNDS+1][4]; // 4 words in a block // // copy the key into the round key array // t = 0; int i = 0; while (i < key.length) { W[t >> 2][t & 3] = (key[i]&0xff) | ((key[i+1]&0xff) << 8) | ((key[i+2]&0xff) << 16) | (key[i+3] << 24); i+=4; t++; } // // while not enough round key material calculated // calculate new values // int k = (ROUNDS + 1) << 2; for (i = KC; (i < k); i++) { int temp = W[(i-1)>>2][(i-1)&3]; if ((i % KC) == 0) { temp = subWord(shift(temp, 8)) ^ rcon[(i / KC)-1]; } else if ((KC > 6) && ((i % KC) == 4)) { temp = subWord(temp); } W[i>>2][i&3] = W[(i - KC)>>2][(i-KC)&3] ^ temp; } if (!forEncryption) { for (int j = 1; j < ROUNDS; j++) { for (i = 0; i < 4; i++) { W[j][i] = inv_mcol(W[j][i]); } } } return W; } private int ROUNDS; private int[][] WorkingKey = null; private int C0, C1, C2, C3; private boolean forEncryption; private static final int BLOCK_SIZE = 16; /** * default constructor - 128 bit block size. */ public AESEngine() { } /** * initialise an AES cipher. * * @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) { WorkingKey = generateWorkingKey(((KeyParameter)params).getKey(), forEncryption); this.forEncryption = forEncryption; return; } throw new IllegalArgumentException("invalid parameter passed to AES init - " + params.getClass().getName()); } public String getAlgorithmName() { return "AES"; } public int getBlockSize() { return BLOCK_SIZE; } public int processBlock( byte[] in, int inOff, byte[] out, int outOff) { if (WorkingKey == null) { throw new IllegalStateException("AES engine not initialised"); } if ((inOff + (32 / 2)) > in.length) { throw new DataLengthException("input buffer too short"); } if ((outOff + (32 / 2)) > out.length) { throw new DataLengthException("output buffer too short"); } if (forEncryption) { unpackBlock(in, inOff); encryptBlock(WorkingKey); packBlock(out, outOff); } else { unpackBlock(in, inOff); decryptBlock(WorkingKey); packBlock(out, outOff); } return BLOCK_SIZE; } public void reset() { } private final void unpackBlock( byte[] bytes, int off) { int index = off; C0 = (bytes[index++] & 0xff); C0 |= (bytes[index++] & 0xff) << 8; C0 |= (bytes[index++] & 0xff) << 16; C0 |= bytes[index++] << 24; C1 = (bytes[index++] & 0xff); C1 |= (bytes[index++] & 0xff) << 8; C1 |= (bytes[index++] & 0xff) << 16; C1 |= bytes[index++] << 24; C2 = (bytes[index++] & 0xff); C2 |= (bytes[index++] & 0xff) << 8; C2 |= (bytes[index++] & 0xff) << 16; C2 |= bytes[index++] << 24; C3 = (bytes[index++] & 0xff); C3 |= (bytes[index++] & 0xff) << 8; C3 |= (bytes[index++] & 0xff) << 16; C3 |= bytes[index++] << 24; } private final void packBlock( byte[] bytes, int off) { int index = off; bytes[index++] = (byte)C0; bytes[index++] = (byte)(C0 >> 8); bytes[index++] = (byte)(C0 >> 16); bytes[index++] = (byte)(C0 >> 24); bytes[index++] = (byte)C1; bytes[index++] = (byte)(C1 >> 8); bytes[index++] = (byte)(C1 >> 16); bytes[index++] = (byte)(C1 >> 24); bytes[index++] = (byte)C2; bytes[index++] = (byte)(C2 >> 8); bytes[index++] = (byte)(C2 >> 16); bytes[index++] = (byte)(C2 >> 24); bytes[index++] = (byte)C3; bytes[index++] = (byte)(C3 >> 8); bytes[index++] = (byte)(C3 >> 16); bytes[index++] = (byte)(C3 >> 24); } private final void encryptBlock(int[][] KW) { int r, r0, r1, r2, r3; C0 ^= KW[0][0]; C1 ^= KW[0][1]; C2 ^= KW[0][2]; C3 ^= KW[0][3]; r = 1; while (r < ROUNDS - 1) { r0 = T0[C0&255] ^ shift(T0[(C1>>8)&255], 24) ^ shift(T0[(C2>>16)&255],16) ^ shift(T0[(C3>>24)&255],8) ^ KW[r][0]; r1 = T0[C1&255] ^ shift(T0[(C2>>8)&255], 24) ^ shift(T0[(C3>>16)&255], 16) ^ shift(T0[(C0>>24)&255], 8) ^ KW[r][1]; r2 = T0[C2&255] ^ shift(T0[(C3>>8)&255], 24) ^ shift(T0[(C0>>16)&255], 16) ^ shift(T0[(C1>>24)&255], 8) ^ KW[r][2]; r3 = T0[C3&255] ^ shift(T0[(C0>>8)&255], 24) ^ shift(T0[(C1>>16)&255], 16) ^ shift(T0[(C2>>24)&255], 8) ^ KW[r++][3]; C0 = T0[r0&255] ^ shift(T0[(r1>>8)&255], 24) ^ shift(T0[(r2>>16)&255], 16) ^ shift(T0[(r3>>24)&255], 8) ^ KW[r][0]; C1 = T0[r1&255] ^ shift(T0[(r2>>8)&255], 24) ^ shift(T0[(r3>>16)&255], 16) ^ shift(T0[(r0>>24)&255], 8) ^ KW[r][1]; C2 = T0[r2&255] ^ shift(T0[(r3>>8)&255], 24) ^ shift(T0[(r0>>16)&255], 16) ^ shift(T0[(r1>>24)&255], 8) ^ KW[r][2]; C3 = T0[r3&255] ^ shift(T0[(r0>>8)&255], 24) ^ shift(T0[(r1>>16)&255], 16) ^ shift(T0[(r2>>24)&255], 8) ^ KW[r++][3]; } r0 = T0[C0&255] ^ shift(T0[(C1>>8)&255], 24) ^ shift(T0[(C2>>16)&255], 16) ^ shift(T0[(C3>>24)&255], 8) ^ KW[r][0]; r1 = T0[C1&255] ^ shift(T0[(C2>>8)&255], 24) ^ shift(T0[(C3>>16)&255], 16) ^ shift(T0[(C0>>24)&255], 8) ^ KW[r][1]; r2 = T0[C2&255] ^ shift(T0[(C3>>8)&255], 24) ^ shift(T0[(C0>>16)&255], 16) ^ shift(T0[(C1>>24)&255], 8) ^ KW[r][2]; r3 = T0[C3&255] ^ shift(T0[(C0>>8)&255], 24) ^ shift(T0[(C1>>16)&255], 16) ^ shift(T0[(C2>>24)&255], 8) ^ KW[r++][3]; // the final round's table is a simple function of S so we don't use a whole other four tables for it C0 = (S[r0&255]&255) ^ ((S[(r1>>8)&255]&255)<<8) ^ ((S[(r2>>16)&255]&255)<<16) ^ (S[(r3>>24)&255]<<24) ^ KW[r][0]; C1 = (S[r1&255]&255) ^ ((S[(r2>>8)&255]&255)<<8) ^ ((S[(r3>>16)&255]&255)<<16) ^ (S[(r0>>24)&255]<<24) ^ KW[r][1]; C2 = (S[r2&255]&255) ^ ((S[(r3>>8)&255]&255)<<8) ^ ((S[(r0>>16)&255]&255)<<16) ^ (S[(r1>>24)&255]<<24) ^ KW[r][2]; C3 = (S[r3&255]&255) ^ ((S[(r0>>8)&255]&255)<<8) ^ ((S[(r1>>16)&255]&255)<<16) ^ (S[(r2>>24)&255]<<24) ^ KW[r][3]; } private final void decryptBlock(int[][] KW) { int r, r0, r1, r2, r3; C0 ^= KW[ROUNDS][0]; C1 ^= KW[ROUNDS][1]; C2 ^= KW[ROUNDS][2]; C3 ^= KW[ROUNDS][3]; r = ROUNDS-1; while (r>1) { r0 = Tinv0[C0&255] ^ shift(Tinv0[(C3>>8)&255], 24) ^ shift(Tinv0[(C2>>16)&255], 16) ^ shift(Tinv0[(C1>>24)&255], 8) ^ KW[r][0]; r1 = Tinv0[C1&255] ^ shift(Tinv0[(C0>>8)&255], 24) ^ shift(Tinv0[(C3>>16)&255], 16) ^ shift(Tinv0[(C2>>24)&255], 8) ^ KW[r][1]; r2 = Tinv0[C2&255] ^ shift(Tinv0[(C1>>8)&255], 24) ^ shift(Tinv0[(C0>>16)&255], 16) ^ shift(Tinv0[(C3>>24)&255], 8) ^ KW[r][2]; r3 = Tinv0[C3&255] ^ shift(Tinv0[(C2>>8)&255], 24) ^ shift(Tinv0[(C1>>16)&255], 16) ^ shift(Tinv0[(C0>>24)&255], 8) ^ KW[r--][3]; C0 = Tinv0[r0&255] ^ shift(Tinv0[(r3>>8)&255], 24) ^ shift(Tinv0[(r2>>16)&255], 16) ^ shift(Tinv0[(r1>>24)&255], 8) ^ KW[r][0]; C1 = Tinv0[r1&255] ^ shift(Tinv0[(r0>>8)&255], 24) ^ shift(Tinv0[(r3>>16)&255], 16) ^ shift(Tinv0[(r2>>24)&255], 8) ^ KW[r][1]; C2 = Tinv0[r2&255] ^ shift(Tinv0[(r1>>8)&255], 24) ^ shift(Tinv0[(r0>>16)&255], 16) ^ shift(Tinv0[(r3>>24)&255], 8) ^ KW[r][2]; C3 = Tinv0[r3&255] ^ shift(Tinv0[(r2>>8)&255], 24) ^ shift(Tinv0[(r1>>16)&255], 16) ^ shift(Tinv0[(r0>>24)&255], 8) ^ KW[r--][3]; } r0 = Tinv0[C0&255] ^ shift(Tinv0[(C3>>8)&255], 24) ^ shift(Tinv0[(C2>>16)&255], 16) ^ shift(Tinv0[(C1>>24)&255], 8) ^ KW[r][0]; r1 = Tinv0[C1&255] ^ shift(Tinv0[(C0>>8)&255], 24) ^ shift(Tinv0[(C3>>16)&255], 16) ^ shift(Tinv0[(C2>>24)&255], 8) ^ KW[r][1]; r2 = Tinv0[C2&255] ^ shift(Tinv0[(C1>>8)&255], 24) ^ shift(Tinv0[(C0>>16)&255], 16) ^ shift(Tinv0[(C3>>24)&255], 8) ^ KW[r][2]; r3 = Tinv0[C3&255] ^ shift(Tinv0[(C2>>8)&255], 24) ^ shift(Tinv0[(C1>>16)&255], 16) ^ shift(Tinv0[(C0>>24)&255], 8) ^ KW[r--][3]; // the final round's table is a simple function of Si so we don't use a whole other four tables for it C0 = (Si[r0&255]&255) ^ ((Si[(r3>>8)&255]&255)<<8) ^ ((Si[(r2>>16)&255]&255)<<16) ^ (Si[(r1>>24)&255]<<24) ^ KW[0][0]; C1 = (Si[r1&255]&255) ^ ((Si[(r0>>8)&255]&255)<<8) ^ ((Si[(r3>>16)&255]&255)<<16) ^ (Si[(r2>>24)&255]<<24) ^ KW[0][1]; C2 = (Si[r2&255]&255) ^ ((Si[(r1>>8)&255]&255)<<8) ^ ((Si[(r0>>16)&255]&255)<<16) ^ (Si[(r3>>24)&255]<<24) ^ KW[0][2]; C3 = (Si[r3&255]&255) ^ ((Si[(r2>>8)&255]&255)<<8) ^ ((Si[(r1>>16)&255]&255)<<16) ^ (Si[(r0>>24)&255]<<24) ^ KW[0][3]; }}?? 快捷鍵說明
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