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Viewing changes to src/org/bouncycastle/crypto/tls/DefaultTlsCipherFactory.java

  • Committer: Brian Thomason
  • Date: 2011-12-20 17:20:32 UTC
  • Revision ID: brian.thomason@canonical.com-20111220172032-rdtm13jgdxtksacr
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src/org/bouncycastle/crypto/tls/DefaultTlsCipherFactory.java
 
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package org.bouncycastle.crypto.tls;
 
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import java.io.IOException;
 
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import org.bouncycastle.crypto.BlockCipher;
 
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import org.bouncycastle.crypto.Digest;
 
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import org.bouncycastle.crypto.digests.MD5Digest;
 
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import org.bouncycastle.crypto.digests.SHA1Digest;
 
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import org.bouncycastle.crypto.digests.SHA256Digest;
 
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import org.bouncycastle.crypto.digests.SHA384Digest;
 
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import org.bouncycastle.crypto.engines.AESFastEngine;
 
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import org.bouncycastle.crypto.engines.DESedeEngine;
 
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import org.bouncycastle.crypto.modes.CBCBlockCipher;
 
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public class DefaultTlsCipherFactory implements TlsCipherFactory
 
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{
 
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    public TlsCipher createCipher(TlsClientContext context, int encryptionAlgorithm, int digestAlgorithm) throws IOException
 
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    {
 
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        switch (encryptionAlgorithm)
 
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        {
 
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            case EncryptionAlgorithm._3DES_EDE_CBC:
 
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                return createDESedeCipher(context, 24, digestAlgorithm);
 
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            case EncryptionAlgorithm.AES_128_CBC:
 
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                return createAESCipher(context, 16, digestAlgorithm);
 
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            case EncryptionAlgorithm.AES_256_CBC:
 
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                return createAESCipher(context, 32, digestAlgorithm);
 
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            default:
 
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                throw new TlsFatalAlert(AlertDescription.internal_error);
 
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        }
 
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    }
 
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    protected TlsCipher createAESCipher(TlsClientContext context, int cipherKeySize, int digestAlgorithm) throws IOException
 
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    {
 
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        return new TlsBlockCipher(context, createAESBlockCipher(),
 
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            createAESBlockCipher(), createDigest(digestAlgorithm), createDigest(digestAlgorithm), cipherKeySize);
 
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    }
 
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    protected TlsCipher createDESedeCipher(TlsClientContext context, int cipherKeySize, int digestAlgorithm) throws IOException
 
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    {
 
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        return new TlsBlockCipher(context, createDESedeBlockCipher(),
 
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            createDESedeBlockCipher(), createDigest(digestAlgorithm), createDigest(digestAlgorithm), cipherKeySize);
 
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    }
 
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    protected BlockCipher createAESBlockCipher()
 
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    {
 
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        return new CBCBlockCipher(new AESFastEngine());
 
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    }
 
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    protected BlockCipher createDESedeBlockCipher()
 
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    {
 
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        return new CBCBlockCipher(new DESedeEngine());
 
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    }
 
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    protected Digest createDigest(int digestAlgorithm) throws IOException
 
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    {
 
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        switch (digestAlgorithm)
 
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        {
 
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            case DigestAlgorithm.MD5:
 
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                return new MD5Digest();
 
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            case DigestAlgorithm.SHA:
 
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                return new SHA1Digest();
 
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            case DigestAlgorithm.SHA256:
 
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                return new SHA256Digest();
 
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            case DigestAlgorithm.SHA384:
 
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                return new SHA384Digest();
 
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            default:
 
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                throw new TlsFatalAlert(AlertDescription.internal_error);
 
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        }
 
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    }
 
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}