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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg;

public class SymmetricKeyUtils
    implements SymmetricKeyAlgorithmTags
{
    public static int getKeyLengthInBits(int algorithm)
    {
        switch (algorithm)
        {
        case NULL:
            throw new IllegalArgumentException("NULL is no encryption algorithm.");
        case DES:
            return 64;
        case IDEA:
        case CAST5:
        case BLOWFISH:
        case SAFER:
        case AES_128:
        case CAMELLIA_128:
            return 128;

        case TRIPLE_DES:
        case AES_192:
        case CAMELLIA_192:
            return 192;

        case AES_256:
        case TWOFISH:
        case CAMELLIA_256:
            return 256;
        default:
            throw new IllegalArgumentException("unknown symmetric algorithm: " + algorithm);
        }
    }

    public static int getKeyLengthInOctets(int algorithm)
    {
        return (getKeyLengthInBits(algorithm) + 7) / 8;
    }
}