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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. 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.openssl.bc;

import org.bouncycastle.openssl.PEMDecryptor;
import org.bouncycastle.openssl.PEMDecryptorProvider;
import org.bouncycastle.openssl.PEMException;
import org.bouncycastle.openssl.PasswordException;

public class BcPEMDecryptorProvider
    implements PEMDecryptorProvider
{
    private final char[] password;

    public BcPEMDecryptorProvider(char[] password)
    {
        this.password = password;
    }

    public PEMDecryptor get(final String dekAlgName)
    {
        return new PEMDecryptor()
        {
            public byte[] decrypt(byte[] keyBytes, byte[] iv)
                throws PEMException
            {
                if (password == null)
                {
                    throw new PasswordException("Password is null, but a password is required");
                }

                return PEMUtilities.crypt(false, keyBytes, password, dekAlgName, iv);
            }
        };
    }
}