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

Example 21 with ParametersWithIV

use of org.bouncycastle.crypto.params.ParametersWithIV in project robovm by robovm.

the class BaseWrapCipher method engineInit.

protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    if (key instanceof BCPBEKey) {
        BCPBEKey k = (BCPBEKey) key;
        if (params instanceof PBEParameterSpec) {
            param = PBE.Util.makePBEParameters(k, params, wrapEngine.getAlgorithmName());
        } else if (k.getParam() != null) {
            param = k.getParam();
        } else {
            throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
        }
    } else {
        param = new KeyParameter(key.getEncoded());
    }
    if (params instanceof IvParameterSpec) {
        IvParameterSpec iv = (IvParameterSpec) params;
        param = new ParametersWithIV(param, iv.getIV());
    }
    if (param instanceof KeyParameter && ivSize != 0) {
        iv = new byte[ivSize];
        random.nextBytes(iv);
        param = new ParametersWithIV(param, iv);
    }
    switch(opmode) {
        case Cipher.WRAP_MODE:
            wrapEngine.init(true, param);
            break;
        case Cipher.UNWRAP_MODE:
            wrapEngine.init(false, param);
            break;
        case Cipher.ENCRYPT_MODE:
        case Cipher.DECRYPT_MODE:
            throw new IllegalArgumentException("engine only valid for wrapping");
        default:
            System.out.println("eeek!");
    }
}

Example 22 with ParametersWithIV

use of org.bouncycastle.crypto.params.ParametersWithIV in project robovm by robovm.

the class CBCBlockCipher method init.

/**
     * Initialise the cipher and, possibly, the initialisation vector (IV).
     * If an IV isn't passed as part of the parameter, the IV will be all zeros.
     *
     * @param encrypting if true the cipher is initialised for
     *  encryption, if false for decryption.
     * @param params the key and other data required by the cipher.
     * @exception IllegalArgumentException if the params argument is
     * inappropriate.
     */
public void init(boolean encrypting, CipherParameters params) throws IllegalArgumentException {
    boolean oldEncrypting = this.encrypting;
    this.encrypting = encrypting;
    if (params instanceof ParametersWithIV) {
        ParametersWithIV ivParam = (ParametersWithIV) params;
        byte[] iv = ivParam.getIV();
        if (iv.length != blockSize) {
            throw new IllegalArgumentException("initialisation vector must be the same length as block size");
        }
        System.arraycopy(iv, 0, IV, 0, iv.length);
        reset();
        // if null it's an IV changed only.
        if (ivParam.getParameters() != null) {
            cipher.init(encrypting, ivParam.getParameters());
        } else if (oldEncrypting != encrypting) {
            throw new IllegalArgumentException("cannot change encrypting state without providing key.");
        }
    } else {
        reset();
        // if it's null, key is to be reused.
        if (params != null) {
            cipher.init(encrypting, params);
        } else if (oldEncrypting != encrypting) {
            throw new IllegalArgumentException("cannot change encrypting state without providing key.");
        }
    }
}

Example 23 with ParametersWithIV

use of org.bouncycastle.crypto.params.ParametersWithIV in project robovm by robovm.

the class CCMBlockCipher method init.

public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
    this.forEncryption = forEncryption;
    if (params instanceof AEADParameters) {
        AEADParameters param = (AEADParameters) params;
        nonce = param.getNonce();
        initialAssociatedText = param.getAssociatedText();
        macSize = param.getMacSize() / 8;
        keyParam = param.getKey();
    } else if (params instanceof ParametersWithIV) {
        ParametersWithIV param = (ParametersWithIV) params;
        nonce = param.getIV();
        initialAssociatedText = null;
        macSize = macBlock.length / 2;
        keyParam = param.getParameters();
    } else {
        throw new IllegalArgumentException("invalid parameters passed to CCM");
    }
    if (nonce == null || nonce.length < 7 || nonce.length > 13) {
        throw new IllegalArgumentException("nonce must have length from 7 to 13 octets");
    }
}

Example 24 with ParametersWithIV

use of org.bouncycastle.crypto.params.ParametersWithIV in project robovm by robovm.

the class CFBBlockCipher method init.

/**
     * Initialise the cipher and, possibly, the initialisation vector (IV).
     * If an IV isn't passed as part of the parameter, the IV will be all zeros.
     * An IV which is too short is handled in FIPS compliant fashion.
     *
     * @param encrypting if true the cipher is initialised for
     *  encryption, if false for decryption.
     * @param params the key and other data required by the cipher.
     * @exception IllegalArgumentException if the params argument is
     * inappropriate.
     */
public void init(boolean encrypting, CipherParameters params) throws IllegalArgumentException {
    this.encrypting = encrypting;
    if (params instanceof ParametersWithIV) {
        ParametersWithIV ivParam = (ParametersWithIV) params;
        byte[] iv = ivParam.getIV();
        if (iv.length < IV.length) {
            // prepend the supplied IV with zeros (per FIPS PUB 81)
            System.arraycopy(iv, 0, IV, IV.length - iv.length, iv.length);
            for (int i = 0; i < IV.length - iv.length; i++) {
                IV[i] = 0;
            }
        } else {
            System.arraycopy(iv, 0, IV, 0, IV.length);
        }
        reset();
        // if null it's an IV changed only.
        if (ivParam.getParameters() != null) {
            cipher.init(true, ivParam.getParameters());
        }
    } else {
        reset();
        // if it's null, key is to be reused.
        if (params != null) {
            cipher.init(true, params);
        }
    }
}

Example 25 with ParametersWithIV

use of org.bouncycastle.crypto.params.ParametersWithIV in project robovm by robovm.

the class GCMBlockCipher method init.

public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
    this.forEncryption = forEncryption;
    this.macBlock = null;
    KeyParameter keyParam;
    if (params instanceof AEADParameters) {
        AEADParameters param = (AEADParameters) params;
        nonce = param.getNonce();
        initialAssociatedText = param.getAssociatedText();
        int macSizeBits = param.getMacSize();
        if (macSizeBits < 96 || macSizeBits > 128 || macSizeBits % 8 != 0) {
            throw new IllegalArgumentException("Invalid value for MAC size: " + macSizeBits);
        }
        macSize = macSizeBits / 8;
        keyParam = param.getKey();
    } else if (params instanceof ParametersWithIV) {
        ParametersWithIV param = (ParametersWithIV) params;
        nonce = param.getIV();
        initialAssociatedText = null;
        macSize = 16;
        keyParam = (KeyParameter) param.getParameters();
    } else {
        throw new IllegalArgumentException("invalid parameters passed to GCM");
    }
    int bufLength = forEncryption ? BLOCK_SIZE : (BLOCK_SIZE + macSize);
    this.bufBlock = new byte[bufLength];
    if (nonce == null || nonce.length < 1) {
        throw new IllegalArgumentException("IV must be at least 1 byte");
    }
    // if keyParam is null we're reusing the last key.
    if (keyParam != null) {
        cipher.init(true, keyParam);
        this.H = new byte[BLOCK_SIZE];
        cipher.processBlock(H, 0, H, 0);
        // GCMMultiplier tables don't change unless the key changes (and are expensive to init)
        multiplier.init(H);
        exp = null;
    }
    this.J0 = new byte[BLOCK_SIZE];
    if (nonce.length == 12) {
        System.arraycopy(nonce, 0, J0, 0, nonce.length);
        this.J0[BLOCK_SIZE - 1] = 0x01;
    } else {
        gHASH(J0, nonce, nonce.length);
        byte[] X = new byte[BLOCK_SIZE];
        Pack.longToBigEndian((long) nonce.length * 8, X, 8);
        gHASHBlock(J0, X);
    }
    this.S = new byte[BLOCK_SIZE];
    this.S_at = new byte[BLOCK_SIZE];
    this.S_atPre = new byte[BLOCK_SIZE];
    this.atBlock = new byte[BLOCK_SIZE];
    this.atBlockPos = 0;
    this.atLength = 0;
    this.atLengthPre = 0;
    this.counter = Arrays.clone(J0);
    this.bufOff = 0;
    this.totalLength = 0;
    if (initialAssociatedText != null) {
        processAADBytes(initialAssociatedText, 0, initialAssociatedText.length);
    }
}