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针对sm2和sm4两种加密算法的java实现

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package com.bouncycastle.crypto.generators;

import com.bouncycastle.crypto.Digest;

/**
 * KFD2 generator for derived keys and ivs as defined by IEEE P1363a/ISO 18033
 * 

 * This implementation is based on IEEE P1363/ISO 18033.
 */
public class KDF2BytesGenerator
    extends BaseKDFBytesGenerator
{
    /**
     * Construct a KDF2 bytes generator. Generates key material
     * according to IEEE P1363 or ISO 18033 depending on the initialisation.
     * 
     * @param digest the digest to be used as the source of derived keys.
     */
    public KDF2BytesGenerator(
        Digest digest)
    {
        super(1, digest);
    }
}