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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.openssl;

import java.io.IOException;

import org.spongycastle.operator.OperatorCreationException;

public class PEMEncryptedKeyPair
{
    private final String dekAlgName;
    private final byte[] iv;
    private final byte[] keyBytes;
    private final PEMKeyPairParser parser;

    PEMEncryptedKeyPair(String dekAlgName, byte[] iv, byte[] keyBytes, PEMKeyPairParser parser)
    {
        this.dekAlgName = dekAlgName;
        this.iv = iv;
        this.keyBytes = keyBytes;
        this.parser = parser;
    }

    public PEMKeyPair decryptKeyPair(PEMDecryptorProvider keyDecryptorProvider)
        throws IOException
    {
        try
        {
            PEMDecryptor keyDecryptor = keyDecryptorProvider.get(dekAlgName);

            return parser.parse(keyDecryptor.decrypt(keyBytes, iv));
        }
        catch (IOException e)
        {
            throw e;
        }
        catch (OperatorCreationException e)
        {
            throw new PEMException("cannot create extraction operator: " + e.getMessage(), e);
        }
        catch (Exception e)
        {
            throw new PEMException("exception processing key pair: " + e.getMessage(), e);
        }
    }
}