Examples with ParametersForThreefish org.bouncycastle.crypto.params.ParametersForThreefish used on opensource projects

Example 1 with ParametersForThreefish

use of org.bouncycastle.crypto.params.ParametersForThreefish in project Skein3Fish by wernerd.

the class ThreefishCipher method init.

public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
    if (params instanceof ParametersForThreefish) {
        ParametersForThreefish pft = (ParametersForThreefish) params;
        stateSize = pft.getStateSize();
        setCipher(stateSize);
        if (cipher == null)
            throw new IllegalArgumentException("Threefish: unsupported state size: " + stateSize);
        byte[] key = ((KeyParameter) pft.getParameters()).getKey();
        if (key.length != (stateSize / 8))
            throw new IllegalArgumentException("Threefish: key length does not match state size: " + key.length);
        long[] tweak = pft.getTweak();
        if (tweak == null)
            throw new IllegalArgumentException("Threefish: tweak data not set");
        cipher.setTweak(tweak);
        // Get a long array for cipher key and moves the byte key buffer to it
        long[] keyLong = new long[stateSize / 64];
        for (int i = 0; i < keyLong.length; i++) keyLong[i] = ByteLong.GetUInt64(key, i * 8);
        cipher.setKey(keyLong);
        this.forEncryption = forEncryption;
        // Allocate buffers
        cipherIn = new long[stateSize / 64];
        cipherOut = new long[stateSize / 64];
        return;
    }
    throw new IllegalArgumentException("Threfish: invalid parameter passed to init - " + params.getClass().getName());
}