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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.jcajce.provider.asymmetric;

import java.util.HashMap;
import java.util.Map;

import org.spongycastle.asn1.gm.GMObjectIdentifiers;
import org.spongycastle.jcajce.provider.config.ConfigurableProvider;
import org.spongycastle.jcajce.provider.util.AsymmetricAlgorithmProvider;

public class GM
{
    private static final String PREFIX = "org.spongycastle.jcajce.provider.asymmetric" + ".ec.";

    private static final Map generalSm2Attributes = new HashMap();

    static
    {
        generalSm2Attributes.put("SupportedKeyClasses", "java.security.interfaces.ECPublicKey|java.security.interfaces.ECPrivateKey");
        generalSm2Attributes.put("SupportedKeyFormats", "PKCS#8|X.509");
    }

    public static class Mappings
        extends AsymmetricAlgorithmProvider
    {
        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("Signature.SM3WITHSM2", PREFIX + "GMSignatureSpi$sm3WithSM2");
            provider.addAlgorithm("Alg.Alias.Signature." + GMObjectIdentifiers.sm2sign_with_sm3, "SM3WITHSM2");
        }
    }
}