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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.asn1;

class DERFactory
{
    static final ASN1Sequence EMPTY_SEQUENCE = new DERSequence();
    static final ASN1Set EMPTY_SET = new DERSet();

    static ASN1Sequence createSequence(ASN1EncodableVector v)
    {
        return v.size() < 1 ? EMPTY_SEQUENCE : new DLSequence(v);
    }

    static ASN1Set createSet(ASN1EncodableVector v)
    {
        return v.size() < 1 ? EMPTY_SET : new DLSet(v);
    }
}