Java OCBBlockCipher类代码示例

import org.bouncycastle.crypto.modes.OCBBlockCipher; //导入依赖的package包/类
private void testModes(BlockCipher cipher1, BlockCipher cipher2, int keySize)
    throws Exception
{
    final KeyParameter key = new KeyParameter(new byte[keySize]);
    final int blockSize = getBlockSize(cipher1);
    final CipherParameters withIv = new ParametersWithIV(key, new byte[blockSize]);

    if (blockSize > 1)
    {
        testMode(new PaddedBufferedBlockCipher(cipher1, new PKCS7Padding()), key);

        testMode(new PaddedBufferedBlockCipher(new CBCBlockCipher(cipher1), new PKCS7Padding()), withIv);

        testMode(new BufferedBlockCipher(new OFBBlockCipher(cipher1, blockSize)), withIv);
        testMode(new BufferedBlockCipher(new CFBBlockCipher(cipher1, blockSize)), withIv);
        testMode(new BufferedBlockCipher(new SICBlockCipher(cipher1)), withIv);
    }
    // CTS requires at least one block
    if (blockSize <= 16 && streamSize >= blockSize)
    {
        testMode(new CTSBlockCipher(cipher1), key);
    }
    if (blockSize <= 16 && streamSize >= blockSize)
    {
        testMode(new NISTCTSBlockCipher(NISTCTSBlockCipher.CS1, cipher1), key);
        testMode(new NISTCTSBlockCipher(NISTCTSBlockCipher.CS2, cipher1), key);
        testMode(new NISTCTSBlockCipher(NISTCTSBlockCipher.CS3, cipher1), key);
    }
    if (blockSize == 8 || blockSize == 16)
    {
        testMode(new EAXBlockCipher(cipher1), withIv);
    }
    if (blockSize == 16)
    {
        testMode(new CCMBlockCipher(cipher1), new ParametersWithIV(key, new byte[7]));
        testMode(new GCMBlockCipher(cipher1), withIv);
        testMode(new OCBBlockCipher(cipher1, cipher2), new ParametersWithIV(key, new byte[15]));
    }
}
 

import org.bouncycastle.crypto.modes.OCBBlockCipher; //导入依赖的package包/类
private void runTestCase(String testName, String[] testVector, int macLengthBits)
    throws InvalidCipherTextException
{

    byte[] key = Hex.decode(K);
    byte[] nonce = Hex.decode(N);

    int pos = 0;
    byte[] A = Hex.decode(testVector[pos++]);
    byte[] P = Hex.decode(testVector[pos++]);
    byte[] C = Hex.decode(testVector[pos++]);

    int macLengthBytes = macLengthBits / 8;

    // TODO Variations processing AAD and cipher bytes incrementally

    KeyParameter keyParameter = new KeyParameter(key);
    AEADParameters aeadParameters = new AEADParameters(keyParameter, macLengthBits, nonce, A);

    OCBBlockCipher encCipher = initCipher(true, aeadParameters);
    OCBBlockCipher decCipher = initCipher(false, aeadParameters);

    checkTestCase(encCipher, decCipher, testName, macLengthBytes, P, C);
    checkTestCase(encCipher, decCipher, testName + " (reused)", macLengthBytes, P, C);

    // TODO Key reuse
}
 

import org.bouncycastle.crypto.modes.OCBBlockCipher; //导入依赖的package包/类
private AEADBlockCipher createOCBCipher()
{
    return new OCBBlockCipher(createUnderlyingCipher(), createUnderlyingCipher());
}
 

import org.bouncycastle.crypto.modes.OCBBlockCipher; //导入依赖的package包/类
private static AEADBlockCipher createOCBCipher(boolean forEncryption, AEADParameters parameters) {
    AEADBlockCipher c = new OCBBlockCipher(new AESEngine(), new AESEngine());
    c.init(forEncryption, parameters);

    return c;
}
 

import org.bouncycastle.crypto.modes.OCBBlockCipher; //导入依赖的package包/类
private OCBBlockCipher initCipher(boolean forEncryption, AEADParameters parameters)
{
    OCBBlockCipher c = new OCBBlockCipher(new AESFastEngine(), new AESFastEngine());
    c.init(forEncryption, parameters);
    return c;
}
 

import org.bouncycastle.crypto.modes.OCBBlockCipher; //导入依赖的package包/类
private void runLongerTestCase(int aesKeySize, int tagLen, byte[] expectedOutput)
    throws InvalidCipherTextException
{
    KeyParameter key = new KeyParameter(new byte[aesKeySize / 8]);
    byte[] N = new byte[12];

    AEADBlockCipher c1 = new OCBBlockCipher(new AESFastEngine(), new AESFastEngine());
    c1.init(true, new AEADParameters(key, tagLen, N));

    AEADBlockCipher c2 = new OCBBlockCipher(new AESFastEngine(), new AESFastEngine());

    long total = 0;

    byte[] S = new byte[128];

    for (int i = 0; i < 128; ++i)
    {
        N[11] = (byte)i;

        c2.init(true, new AEADParameters(key, tagLen, N));

        total += updateCiphers(c1, c2, S, i, true, true);
        total += updateCiphers(c1, c2, S, i, false, true);
        total += updateCiphers(c1, c2, S, i, true, false);
    }

    long expectedTotal = 16256 + (48 * tagLen);

    if (total != expectedTotal)
    {
        fail("test generated the wrong amount of input: " + total);
    }

    byte[] output = new byte[c1.getOutputSize(0)];
    c1.doFinal(output, 0);

    if (!areEqual(expectedOutput, output))
    {
        fail("incorrect encrypt in long-form test");
    }
}