Java EAXBlockCipher.doFinal方法代码示例

import org.bouncycastle.crypto.modes.EAXBlockCipher; //导入方法依赖的package包/类
private void doEax(byte[] key, byte[] iv, byte[] pt, byte[] aad, int tagLength, byte[] expected)
    throws InvalidCipherTextException
{
    EAXBlockCipher c = new EAXBlockCipher(new SerpentEngine());

    c.init(true, new AEADParameters(new KeyParameter(key), tagLength, iv, aad));

    byte[] out = new byte[expected.length];

    int len = c.processBytes(pt, 0, pt.length, out, 0);

    c.doFinal(out, len);

    if (!Arrays.areEqual(expected, out))
    {
        fail("EAX test failed");
    }
}
 

import org.bouncycastle.crypto.modes.EAXBlockCipher; //导入方法依赖的package包/类
private void randomTest(
    SecureRandom srng)
    throws InvalidCipherTextException
{
    int DAT_LEN = srng.nextInt() >>> 22; // Note: JDK1.0 compatibility
    byte[] nonce = new byte[NONCE_LEN];
    byte[] authen = new byte[AUTHEN_LEN];
    byte[] datIn = new byte[DAT_LEN];
    byte[] key = new byte[16];
    srng.nextBytes(nonce);
    srng.nextBytes(authen);
    srng.nextBytes(datIn);
    srng.nextBytes(key);

    AESFastEngine engine = new AESFastEngine();
    KeyParameter sessKey = new KeyParameter(key);
    EAXBlockCipher eaxCipher = new EAXBlockCipher(engine);

    AEADParameters params = new AEADParameters(sessKey, MAC_LEN * 8, nonce, authen);
    eaxCipher.init(true, params);

    byte[] intrDat = new byte[eaxCipher.getOutputSize(datIn.length)];
    int outOff = eaxCipher.processBytes(datIn, 0, DAT_LEN, intrDat, 0);
    outOff += eaxCipher.doFinal(intrDat, outOff);

    eaxCipher.init(false, params);
    byte[] datOut = new byte[eaxCipher.getOutputSize(outOff)];
    int resultLen = eaxCipher.processBytes(intrDat, 0, outOff, datOut, 0);
    eaxCipher.doFinal(datOut, resultLen);

    if (!areEqual(datIn, datOut))
    {
        fail("EAX roundtrip failed to match");
    }
}
 

import org.bouncycastle.crypto.modes.EAXBlockCipher; //导入方法依赖的package包/类
public static final byte[] encrypt(byte[] data) throws Exception
{
	EAXBlockCipher cipher = new EAXBlockCipher(new AESEngine());
	
	byte[] nonce = new byte[NONCE_SIZE_BYTES];
	new SecureRandom().nextBytes(nonce);

	byte[] key = generateKey();
	KeyParameter kp = new KeyParameter(key);
	try
	{
		AEADParameters par = new AEADParameters(kp, MAC_SIZE_BITS, nonce, ZERO_BYTE_ARRAY);
		cipher.init(true, par);
		
		int sz = cipher.getOutputSize(data.length);
		byte[] out = new byte[NONCE_SIZE_BYTES + sz];
		System.arraycopy(nonce, 0, out, 0, NONCE_SIZE_BYTES);

		int off = NONCE_SIZE_BYTES;
		off += cipher.processBytes(data, 0, data.length, out, off);
		cipher.doFinal(out, off);
		return out;
	}
	finally
	{
		Crypto.zero(kp);
		Crypto.zero(key);
	}
}
 

import org.bouncycastle.crypto.modes.EAXBlockCipher; //导入方法依赖的package包/类
public static final byte[] decrypt(byte[] data) throws Exception
{
	EAXBlockCipher cipher = new EAXBlockCipher(new AESEngine());
	
	byte[] nonce = new byte[NONCE_SIZE_BYTES];
	System.arraycopy(data, 0, nonce, 0, NONCE_SIZE_BYTES);
	
	byte[] key = generateKey();
	KeyParameter kp = new KeyParameter(key);
	try
	{
		AEADParameters par = new AEADParameters(kp, MAC_SIZE_BITS, nonce, ZERO_BYTE_ARRAY);
		cipher.init(false, par);
		
		int sz = cipher.getOutputSize(data.length - NONCE_SIZE_BYTES);
		byte[] out = new byte[sz];
		
		int off = cipher.processBytes(data, NONCE_SIZE_BYTES, data.length - NONCE_SIZE_BYTES, out, 0);
		cipher.doFinal(out, off);
		return out;
	}
	finally
	{
		Crypto.zero(kp);
		Crypto.zero(key);
	}
}
 

import org.bouncycastle.crypto.modes.EAXBlockCipher; //导入方法依赖的package包/类
private void runCheckVectors(
    int count,
    EAXBlockCipher encEax,
    EAXBlockCipher decEax,
    String additionalDataType,
    byte[] sa,
    byte[] p,
    byte[] t,
    byte[] c)
    throws InvalidCipherTextException
{
    byte[] enc = new byte[c.length];

    if (sa != null)
    {
        encEax.processAADBytes(sa, 0, sa.length);
    }

    int len = encEax.processBytes(p, 0, p.length, enc, 0);

    len += encEax.doFinal(enc, len);

    if (!areEqual(c, enc))
    {
        fail("encrypted stream fails to match in test " + count + " with " + additionalDataType);
    }

    byte[] tmp = new byte[enc.length];

    if (sa != null)
    {
        decEax.processAADBytes(sa, 0, sa.length);
    }

    len = decEax.processBytes(enc, 0, enc.length, tmp, 0);

    len += decEax.doFinal(tmp, len);

    byte[] dec = new byte[len];

    System.arraycopy(tmp, 0, dec, 0, len);

    if (!areEqual(p, dec))
    {
        fail("decrypted stream fails to match in test " + count + " with " + additionalDataType);
    }

    if (!areEqual(t, decEax.getMac()))
    {
        fail("MAC fails to match in test " + count + " with " + additionalDataType);
    }
}
 

import org.bouncycastle.crypto.modes.EAXBlockCipher; //导入方法依赖的package包/类
private void runCheckVectors(
    int count,
    EAXBlockCipher encEax,
    EAXBlockCipher decEax,
    String additionalDataType,
    byte[] sa,
    byte[] p,
    byte[] t,
    byte[] c)
    throws InvalidCipherTextException
{
    byte[] enc = new byte[c.length];

    if (sa != null)
    {
        encEax.processAADBytes(sa, 0, sa.length);
    }

    int len = encEax.processBytes(p, 0, p.length, enc, 0);

    len += encEax.doFinal(enc, len);

    if (!areEqual(c, enc))
    {
        fail("encrypted stream fails to match in test " + count + " with " + additionalDataType);
    }

    byte[] tmp = new byte[enc.length];

    if (sa != null)
    {
        decEax.processAADBytes(sa, 0, sa.length);
    }

    len = decEax.processBytes(enc, 0, enc.length, tmp, 0);

    len += decEax.doFinal(tmp, len);

    byte[] dec = new byte[len];
    
    System.arraycopy(tmp, 0, dec, 0, len);

    if (!areEqual(p, dec))
    {
        fail("decrypted stream fails to match in test " + count + " with " + additionalDataType);
    }

    if (!areEqual(t, decEax.getMac()))
    {
        fail("MAC fails to match in test " + count + " with " + additionalDataType);
    }
}