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The FIPS 140-3 Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms certified to FIPS 140-3 level 1. This jar contains JCE provider and low-level API for the BC-FJA version 2.0.0, FIPS Certificate #4743. Please see certificate for certified platform details.

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package org.bouncycastle.crypto.general;

import java.io.InputStream;
import java.io.OutputStream;
import java.security.SecureRandom;

import org.bouncycastle.crypto.CipherOutputStream;
import org.bouncycastle.crypto.CryptoServicesRegistrar;
import org.bouncycastle.crypto.InputDecryptor;
import org.bouncycastle.crypto.OperatorUsingSecureRandom;
import org.bouncycastle.crypto.OutputDecryptor;
import org.bouncycastle.crypto.OutputEncryptor;
import org.bouncycastle.crypto.Parameters;
import org.bouncycastle.crypto.SymmetricKey;
import org.bouncycastle.crypto.SymmetricOperatorFactory;
import org.bouncycastle.crypto.fips.FipsStatus;
import org.bouncycastle.crypto.fips.FipsUnapprovedOperationError;
import org.bouncycastle.crypto.internal.StreamCipher;
import org.bouncycastle.crypto.internal.io.CipherInputStream;
import org.bouncycastle.crypto.internal.io.CipherOutputStreamImpl;

abstract class GuardedSymmetricStreamOperatorFactory
    implements SymmetricOperatorFactory
{
    // package protect constructor
    GuardedSymmetricStreamOperatorFactory()
    {
        if (!FipsStatus.isReady())
        {
            throw new FipsUnapprovedOperationError("Module has not entered the ready state.");
        }
        if (CryptoServicesRegistrar.isInApprovedOnlyMode())
        {
            throw new FipsUnapprovedOperationError("Attempt to create unapproved factory in approved mode");
        }
    }

    public final OutputEncryptor createOutputEncryptor(SymmetricKey key, final T parameters)
    {
        if (CryptoServicesRegistrar.isInApprovedOnlyMode())
        {
            throw new FipsUnapprovedOperationError("Attempt to create unapproved algorithm in approved mode", parameters.getAlgorithm());
        }

        return new OutEncryptor(key, parameters, null);
    }

    public OutputDecryptor createOutputDecryptor(SymmetricKey key, final T parameters)
    {
        if (CryptoServicesRegistrar.isInApprovedOnlyMode())
        {
            throw new FipsUnapprovedOperationError("Attempt to create unapproved algorithm in approved mode", parameters.getAlgorithm());
        }

        final StreamCipher cipher = createCipher(false, key, parameters, null);

        return new OutputDecryptor()
        {
            public CipherOutputStreamImpl getDecryptingStream(OutputStream out)
            {
                return new CipherOutputStreamImpl(out, cipher);
            }

            public T getParameters()
            {
                return parameters;
            }

            public int getMaxOutputSize(int inputLen)
            {
                return inputLen;
            }

            public int getUpdateOutputSize(int inputLen)
            {
                return inputLen;
            }
        };
    }

    public final InputDecryptor createInputDecryptor(SymmetricKey key, final T parameters)
    {
        if (CryptoServicesRegistrar.isInApprovedOnlyMode())
        {
            throw new FipsUnapprovedOperationError("Attempt to create unapproved algorithm in approved mode", parameters.getAlgorithm());
        }

        final StreamCipher cipher = createCipher(false, key, parameters, null);

        return new InputDecryptor()
        {
            public T getParameters()
            {
                return parameters;
            }

            public InputStream getDecryptingStream(InputStream in)
            {
                return new CipherInputStream(in, cipher);
            }
        };
    }

    protected abstract StreamCipher createCipher(boolean forEncryption, SymmetricKey key, T parameters, SecureRandom random);

    private class OutEncryptor
        implements OutputEncryptor, OperatorUsingSecureRandom>
    {
        private final T parameters;
        private final SymmetricKey key;
        private final StreamCipher cipher;

        public OutEncryptor(SymmetricKey key, T parameters, SecureRandom random)
        {
            this.key = key;
            this.parameters = parameters;

            cipher = createCipher(true, key, parameters, random);
        }

        public CipherOutputStream getEncryptingStream(OutputStream out)
        {
            return new CipherOutputStreamImpl(out, cipher);
        }

        public OutputEncryptor withSecureRandom(SecureRandom random)
        {
            return new OutEncryptor(key, parameters, random);
        }

        public T getParameters()
        {
            return parameters;
        }

        public int getMaxOutputSize(int inputLen)
        {
            return inputLen;
        }

        public int getUpdateOutputSize(int inputLen)
        {
            return inputLen;
        }
    }
}