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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
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       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.poifs.crypt;

import org.apache.poi.EncryptedDocumentException;

public enum CipherAlgorithm {
    // key size for rc4: 0x00000028 - 0x00000080 (inclusive) with 8-bit increments
    // no block size, because its a streaming cipher
    rc4(CipherProvider.rc4,    "RC4", 0x6801, 0x40, new int[]{0x28,0x30,0x38,0x40,0x48,0x50,0x58,0x60,0x68,0x70,0x78,0x80}, -1, 20, "RC4", false),
    // aes has always a block size of 128 - only its keysize may vary
    aes128(CipherProvider.aes, "AES", 0x660E, 128, new int[]{128}, 16, 32, "AES", false),
    aes192(CipherProvider.aes, "AES", 0x660F, 192, new int[]{192}, 16, 32, "AES", false),
    aes256(CipherProvider.aes, "AES", 0x6610, 256, new int[]{256}, 16, 32, "AES", false),
    rc2(null, "RC2", -1, 0x80, new int[]{0x28,0x30,0x38,0x40,0x48,0x50,0x58,0x60,0x68,0x70,0x78,0x80}, 8, 20, "RC2", false),
    des(null, "DES", -1, 64, new int[]{64}, 8/*for 56-bit*/, 32, "DES", false),
    // desx is not supported. Not sure, if it can be simulated by des3 somehow
    des3(null, "DESede", -1, 192, new int[]{192}, 8, 32, "3DES", false),
    // need bouncycastle provider for this one ...
    // see http://stackoverflow.com/questions/4436397/3des-des-encryption-using-the-jce-generating-an-acceptable-key
    des3_112(null, "DESede", -1, 128, new int[]{128}, 8, 32, "3DES_112", true),
    // only for digital signatures
    rsa(null, "RSA", -1, 1024, new int[]{1024, 2048, 3072, 4096}, -1, -1, "", false);

    public final CipherProvider provider;
    public final String jceId;
    public final int ecmaId;
    public final int defaultKeySize;
    public final int[] allowedKeySize;
    public final int blockSize;
    public final int encryptedVerifierHashLength;
    public final String xmlId;
    public final boolean needsBouncyCastle;
    
    CipherAlgorithm(CipherProvider provider, String jceId, int ecmaId, int defaultKeySize, int[] allowedKeySize, int blockSize, int encryptedVerifierHashLength, String xmlId, boolean needsBouncyCastle) {
        this.provider = provider;
        this.jceId = jceId;
        this.ecmaId = ecmaId;
        this.defaultKeySize = defaultKeySize;
        this.allowedKeySize = allowedKeySize.clone();
        this.blockSize = blockSize;
        this.encryptedVerifierHashLength = encryptedVerifierHashLength;
        this.xmlId = xmlId;
        this.needsBouncyCastle = needsBouncyCastle;
    }

    public static CipherAlgorithm fromEcmaId(int ecmaId) {
        for (CipherAlgorithm ca : CipherAlgorithm.values()) {
            if (ca.ecmaId == ecmaId) return ca;
        }
        throw new EncryptedDocumentException("cipher algorithm " + ecmaId + " not found");
    }
    
    public static CipherAlgorithm fromXmlId(String xmlId, int keySize) {
        for (CipherAlgorithm ca : CipherAlgorithm.values()) {
            if (!ca.xmlId.equals(xmlId)) continue;
            for (int ks : ca.allowedKeySize) {
                if (ks == keySize) return ca;
            }
        }
        throw new EncryptedDocumentException("cipher algorithm " + xmlId + "/" + keySize + " not found");
    }
}