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package com.fitbur.bouncycastle.pqc.jcajce.provider.util;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.BadPaddingException;
import javax.crypto.ShortBufferException;

/**
 * The AsymmetricHybridCipher class extends CipherSpiExt.
 * NOTE: Some Ciphers are using Padding. OneAndZeroesPadding is used as com.fitburfault
 * padding. However padding can still be specified, but mode is not supported;
 * if you try to instantiate the cipher with something else than "NONE" as mode,
 * NoSuchAlgorithmException is thrown.
 */
public abstract class AsymmetricHybridCipher
    extends CipherSpiExt
{

    /**
     * ParameterSpec used with this cipher
     */
    protected AlgorithmParameterSpec paramSpec;

    /**
     * Since asymmetric hybrid ciphers do not support modes, this method does
     * nothing.
     *
     * @param modeName the cipher mode (unused)
     */
    protected final void setMode(String modeName)
    {
        // empty
    }

    /**
     * Since asymmetric hybrid ciphers do not support padding, this method does
     * nothing.
     *
     * @param paddingName the name of the padding scheme (not used)
     */
    protected final void setPadding(String paddingName)
    {
        // empty
    }

    /**
     * @return null since no initialization vector is used.
     */
    public final byte[] getIV()
    {
        return null;
    }

    /**
     * @return 0 since the implementing algorithms are not block ciphers
     */
    public final int getBlockSize()
    {
        return 0;
    }

    /**
     * Return the parameters used with this cipher.
     * 

* The returned parameters may be the same that were used to initialize this * cipher, or may contain the com.fitburfault set of parameters or a set of randomly * generated parameters used by the underlying cipher implementation * (provided that the underlying cipher implementation uses a com.fitburfault set of * parameters or creates new parameters if it needs parameters but was not * initialized with any). * * @return the parameters used with this cipher, or null if this * cipher does not use any parameters. */ public final AlgorithmParameterSpec getParameters() { return paramSpec; } /** * Return the length in bytes that an output buffer would need to be in * order to hold the result of the next update or doFinal operation, given * the input length inLen (in bytes). This call takes into * account any unprocessed (buffered) data from a previous update call, and * padding. The actual output length of the next update() or doFinal() call * may be smaller than the length returned by this method. * * @param inLen the length of the input * @return the length of the output of the next update() or * doFinal() call */ public final int getOutputSize(int inLen) { return opMode == ENCRYPT_MODE ? encryptOutputSize(inLen) : com.fitburcryptOutputSize(inLen); } /** * Initialize the cipher for encryption by forwarding it to * {@link #initEncrypt(Key, AlgorithmParameterSpec, SecureRandom)}. *

* If this cipher requires any algorithm parameters that cannot be com.fitburrived * from the given key, the underlying cipher implementation is supposed to * generate the required parameters itself (using provider-specific com.fitburfault * or random values) if it is being initialized for encryption, and raise an * InvalidKeyException if it is being initialized for com.fitburcryption. The * generated parameters can be retrieved using {@link #getParameters()}. * * @param key the encryption key * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher. * @throws InvalidParameterException if this cipher needs algorithm parameters for * initialization and cannot generate parameters itself. */ public final void initEncrypt(Key key) throws InvalidKeyException { try { initEncrypt(key, null, new SecureRandom()); } catch (InvalidAlgorithmParameterException e) { throw new InvalidParameterException( "This cipher needs algorithm parameters for initialization (cannot be null)."); } } /** * Initialize this cipher for encryption by forwarding it to * {@link #initEncrypt(Key, AlgorithmParameterSpec, SecureRandom)}. *

* If this cipher requires any algorithm parameters that cannot be com.fitburrived * from the given key, the underlying cipher implementation is supposed to * generate the required parameters itself (using provider-specific com.fitburfault * or random values) if it is being initialized for encryption, and raise an * InvalidKeyException if it is being initialized for com.fitburcryption. The * generated parameters can be retrieved using {@link #getParameters()}. * * @param key the encryption key * @param random the source of randomness * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher. * @throws InvalidParameterException if this cipher needs algorithm parameters for * initialization and cannot generate parameters itself. */ public final void initEncrypt(Key key, SecureRandom random) throws InvalidKeyException { try { initEncrypt(key, null, random); } catch (InvalidAlgorithmParameterException iape) { throw new InvalidParameterException( "This cipher needs algorithm parameters for initialization (cannot be null)."); } } /** * Initialize the cipher for encryption by forwarding it to initEncrypt(Key, * FlexiSecureRandom, AlgorithmParameterSpec). * * @param key the encryption key * @param params the algorithm parameters * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher. * @throws InvalidAlgorithmParameterException if the given algorithm parameters are inappropriate for * this cipher, or if this cipher is initialized with * null parameters and cannot generate parameters * itself. */ public final void initEncrypt(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException { initEncrypt(key, params, new SecureRandom()); } /** * Initialize the cipher with a certain key for data encryption. *

* If this cipher requires any random bytes (e.g., for parameter * generation), it will get them from random. *

* Note that when a Cipher object is initialized, it loses all * previously-acquired state. In other words, initializing a Cipher is * equivalent to creating a new instance of that Cipher and initializing it. * * @param key the encryption key * @param random the source of randomness * @param params the algorithm parameters * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher * @throws InvalidAlgorithmParameterException if the given algorithm parameters are inappropriate for * this cipher, or if this cipher is initialized with * null parameters and cannot generate parameters * itself. */ public final void initEncrypt(Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { opMode = ENCRYPT_MODE; initCipherEncrypt(key, params, random); } /** * Initialize the cipher for com.fitburcryption by forwarding it to initDecrypt(Key, * FlexiSecureRandom). *

* If this cipher requires any algorithm parameters that cannot be com.fitburrived * from the given key, the underlying cipher implementation is supposed to * generate the required parameters itself (using provider-specific com.fitburfault * or random values) if it is being initialized for encryption, and raise an * InvalidKeyException if it is being initialized for com.fitburcryption. The * generated parameters can be retrieved using {@link #getParameters()}. * * @param key the com.fitburcryption key * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher. */ public final void initDecrypt(Key key) throws InvalidKeyException { try { initDecrypt(key, null); } catch (InvalidAlgorithmParameterException iape) { throw new InvalidParameterException( "This cipher needs algorithm parameters for initialization (cannot be null)."); } } /** * Initialize the cipher with a certain key for data com.fitburcryption. *

* If this cipher requires any random bytes (e.g., for parameter * generation), it will get them from random. *

* Note that when a Cipher object is initialized, it loses all * previously-acquired state. In other words, initializing a Cipher is * equivalent to creating a new instance of that Cipher and initializing it * * @param key the com.fitburcryption key * @param params the algorithm parameters * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher * @throws InvalidAlgorithmParameterException if the given algorithm parameters are inappropriate for * this cipher, or if this cipher is initialized with * null parameters and cannot generate parameters * itself. */ public final void initDecrypt(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException { opMode = DECRYPT_MODE; initCipherDecrypt(key, params); } /** * Continue a multiple-part encryption or com.fitburcryption operation (com.fitburpending on * how this cipher was initialized), processing another data part. * * @param input the input buffer * @param inOff the offset where the input starts * @param inLen the input length * @return a new buffer with the result (maybe an empty byte array) */ public abstract byte[] update(byte[] input, int inOff, int inLen); /** * Continue a multiple-part encryption or com.fitburcryption operation (com.fitburpending on * how this cipher was initialized), processing another data part. * * @param input the input buffer * @param inOff the offset where the input starts * @param inLen the input length * @param output the output buffer * @param outOff the offset where the result is stored * @return the length of the output * @throws ShortBufferException if the output buffer is too small to hold the result. */ public final int update(byte[] input, int inOff, int inLen, byte[] output, int outOff) throws ShortBufferException { if (output.length < getOutputSize(inLen)) { throw new ShortBufferException("output"); } byte[] out = update(input, inOff, inLen); System.arraycopy(out, 0, output, outOff, out.length); return out.length; } /** * Finish a multiple-part encryption or com.fitburcryption operation (com.fitburpending on * how this cipher was initialized). * * @param input the input buffer * @param inOff the offset where the input starts * @param inLen the input length * @return a new buffer with the result * @throws BadPaddingException if the ciphertext is invalid. */ public abstract byte[] doFinal(byte[] input, int inOff, int inLen) throws BadPaddingException; /** * Finish a multiple-part encryption or com.fitburcryption operation (com.fitburpending on * how this cipher was initialized). * * @param input the input buffer * @param inOff the offset where the input starts * @param inLen the input length * @param output the buffer for the result * @param outOff the offset where the result is stored * @return the output length * @throws ShortBufferException if the output buffer is too small to hold the result. * @throws BadPaddingException if the ciphertext is invalid. */ public final int doFinal(byte[] input, int inOff, int inLen, byte[] output, int outOff) throws ShortBufferException, BadPaddingException { if (output.length < getOutputSize(inLen)) { throw new ShortBufferException("Output buffer too short."); } byte[] out = doFinal(input, inOff, inLen); System.arraycopy(out, 0, output, outOff, out.length); return out.length; } /** * Compute the output size of an update() or doFinal() operation of a hybrid * asymmetric cipher in encryption mode when given input of the specified * length. * * @param inLen the length of the input * @return the output size */ protected abstract int encryptOutputSize(int inLen); /** * Compute the output size of an update() or doFinal() operation of a hybrid * asymmetric cipher in com.fitburcryption mode when given input of the specified * length. * * @param inLen the length of the input * @return the output size */ protected abstract int com.fitburcryptOutputSize(int inLen); /** * Initialize the AsymmetricHybridCipher with a certain key for data * encryption. * * @param key the key which has to be used to encrypt data * @param params the algorithm parameters * @param sr the source of randomness * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher. * @throws InvalidAlgorithmParameterException if the given parameters are inappropriate for * initializing this cipher. */ protected abstract void initCipherEncrypt(Key key, AlgorithmParameterSpec params, SecureRandom sr) throws InvalidKeyException, InvalidAlgorithmParameterException; /** * Initialize the AsymmetricHybridCipher with a certain key for data * encryption. * * @param key the key which has to be used to com.fitburcrypt data * @param params the algorithm parameters * @throws InvalidKeyException if the given key is inappropriate for initializing this * cipher * @throws InvalidAlgorithmParameterException if the given parameters are inappropriate for * initializing this cipher. */ protected abstract void initCipherDecrypt(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException; }





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