Instruction:
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## 内容1
### 文件路径：
core/src/main/java/org/bouncycastle/asn1/ASN1Enumerated.java
### 代码内容：
package org.bouncycastle.asn1;

import java.io.IOException;
import java.math.BigInteger;

import org.bouncycastle.util.Arrays;

/**
 * Class representing the ASN.1 ENUMERATED type.
 */
public class ASN1Enumerated
    extends ASN1Primitive
{
    private final byte[] bytes;

    /**
     * return an enumerated from the passed in object
     *
     * @param obj an ASN1Enumerated or an object that can be converted into one.
     * @exception IllegalArgumentException if the object cannot be converted.
     * @return an ASN1Enumerated instance, or null.
     */
    public static ASN1Enumerated getInstance(
        Object  obj)
    {
        if (obj == null || obj instanceof ASN1Enumerated)
        {
            return (ASN1Enumerated)obj;
        }

        if (obj instanceof byte[])
        {
            try
            {
                return (ASN1Enumerated)fromByteArray((byte[])obj);
            }
            catch (Exception e)
            {
                throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
            }
        }

        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
    }

    /**
     * return an Enumerated from a tagged object.
     *
     * @param obj the tagged object holding the object we want
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the tagged object cannot
     *               be converted.
     * @return an ASN1Enumerated instance, or null.
     */
    public static ASN1Enumerated getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        ASN1Primitive o = obj.getObject();

        if (explicit || o instanceof ASN1Enumerated)
        {
            return getInstance(o);
        }
        else
        {
            return fromOctetString(((ASN1OctetString)o).getOctets());
        }
    }

    /**
     * Constructor from int.
     *
     * @param value the value of this enumerated.
     */
    public ASN1Enumerated(
        int         value)
    {
        bytes = BigInteger.valueOf(value).toByteArray();
    }

    /**
     * Constructor from BigInteger
     *
     * @param value the value of this enumerated.
     */
    public ASN1Enumerated(
        BigInteger   value)
    {
        bytes = value.toByteArray();
    }

    /**
     * Constructor from encoded BigInteger.
     *
     * @param bytes the value of this enumerated as an encoded BigInteger (signed).
     */
    public ASN1Enumerated(
        byte[]   bytes)
    {
        this.bytes = Arrays.clone(bytes);
    }

    public BigInteger getValue()
    {
        return new BigInteger(bytes);
    }

    boolean isConstructed()
    {
        return false;
    }

    int encodedLength()
    {
        return 1 + StreamUtil.calculateBodyLength(bytes.length) + bytes.length;
    }

    void encode(
        ASN1OutputStream out)
        throws IOException
    {
        out.writeEncoded(BERTags.ENUMERATED, bytes);
    }

    boolean asn1Equals(
        ASN1Primitive  o)
    {
        if (!(o instanceof ASN1Enumerated))
        {
            return false;
        }

        ASN1Enumerated other = (ASN1Enumerated)o;

        return Arrays.areEqual(this.bytes, other.bytes);
    }

    public int hashCode()
    {
        return Arrays.hashCode(bytes);
    }

    private static ASN1Enumerated[] cache = new ASN1Enumerated[12];

    static ASN1Enumerated fromOctetString(byte[] enc)
    {
        if (enc.length > 1)
        {
            return new ASN1Enumerated(enc);
        }

        if (enc.length == 0)
        {
            throw new IllegalArgumentException("ENUMERATED has zero length");
        }
        int value = enc[0] & 0xff;

        if (value >= cache.length)
        {
            return new ASN1Enumerated(Arrays.clone(enc));
        }

        ASN1Enumerated possibleMatch = cache[value];

        if (possibleMatch == null)
        {
            possibleMatch = cache[value] = new ASN1Enumerated(Arrays.clone(enc));
        }

        return possibleMatch;
    }
}

## 内容2
### 文件路径：
core/src/main/java/org/bouncycastle/asn1/ASN1Integer.java
### 代码内容：
package org.bouncycastle.asn1;

import java.io.IOException;
import java.math.BigInteger;

import org.bouncycastle.util.Arrays;

/**
 * Class representing the ASN.1 INTEGER type.
 */
public class ASN1Integer
    extends ASN1Primitive
{
    private final byte[] bytes;

    /**
     * return an integer from the passed in object
     *
     * @param obj an ASN1Integer or an object that can be converted into one.
     * @throws IllegalArgumentException if the object cannot be converted.
     * @return an ASN1Integer instance.
     */
    public static ASN1Integer getInstance(
        Object obj)
    {
        if (obj == null || obj instanceof ASN1Integer)
        {
            return (ASN1Integer)obj;
        }

        if (obj instanceof byte[])
        {
            try
            {
                return (ASN1Integer)fromByteArray((byte[])obj);
            }
            catch (Exception e)
            {
                throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
            }
        }

        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
    }

    /**
     * return an Integer from a tagged object.
     *
     * @param obj      the tagged object holding the object we want
     * @param explicit true if the object is meant to be explicitly
     *                 tagged false otherwise.
     * @throws IllegalArgumentException if the tagged object cannot
     * be converted.
     * @return an ASN1Integer instance.
     */
    public static ASN1Integer getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        ASN1Primitive o = obj.getObject();

        if (explicit || o instanceof ASN1Integer)
        {
            return getInstance(o);
        }
        else
        {
            return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets());
        }
    }

    public ASN1Integer(
        long value)
    {
        bytes = BigInteger.valueOf(value).toByteArray();
    }

    public ASN1Integer(
        BigInteger value)
    {
        bytes = value.toByteArray();
    }

    public ASN1Integer(
        byte[] bytes)
    {
        this(bytes, true);
    }

    ASN1Integer(byte[] bytes, boolean clone)
    {
        this.bytes = (clone) ? Arrays.clone(bytes) : bytes;
    }

    public BigInteger getValue()
    {
        return new BigInteger(bytes);
    }

    /**
     * in some cases positive values get crammed into a space,
     * that's not quite big enough...
     * @return the BigInteger that results from treating this ASN.1 INTEGER as unsigned.
     */
    public BigInteger getPositiveValue()
    {
        return new BigInteger(1, bytes);
    }

    boolean isConstructed()
    {
        return false;
    }

    int encodedLength()
    {
        return 1 + StreamUtil.calculateBodyLength(bytes.length) + bytes.length;
    }

    void encode(
        ASN1OutputStream out)
        throws IOException
    {
        out.writeEncoded(BERTags.INTEGER, bytes);
    }

    public int hashCode()
    {
        int value = 0;

        for (int i = 0; i != bytes.length; i++)
        {
            value ^= (bytes[i] & 0xff) << (i % 4);
        }

        return value;
    }

    boolean asn1Equals(
        ASN1Primitive o)
    {
        if (!(o instanceof ASN1Integer))
        {
            return false;
        }

        ASN1Integer other = (ASN1Integer)o;

        return Arrays.areEqual(bytes, other.bytes);
    }

    public String toString()
    {
        return getValue().toString();
    }

}

## 内容3
### 文件路径：
prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSASigner.java
### 代码内容：
package org.bouncycastle.jcajce.provider.asymmetric.dsa;

import java.io.IOException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.SignatureException;
import java.security.SignatureSpi;
import java.security.spec.AlgorithmParameterSpec;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DSA;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.NullDigest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.digests.SHA224Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.digests.SHA384Digest;
import org.bouncycastle.crypto.digests.SHA3Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.HMacDSAKCalculator;

public class DSASigner
    extends SignatureSpi
    implements PKCSObjectIdentifiers, X509ObjectIdentifiers
{
    private Digest                  digest;
    private DSA                     signer;
    private SecureRandom            random;

    protected DSASigner(
        Digest digest,
        DSA signer)
    {
        this.digest = digest;
        this.signer = signer;
    }

    protected void engineInitVerify(
        PublicKey   publicKey)
        throws InvalidKeyException
    {
        CipherParameters    param = DSAUtil.generatePublicKeyParameter(publicKey);

        digest.reset();
        signer.init(false, param);
    }

    protected void engineInitSign(
        PrivateKey      privateKey,
        SecureRandom    random)
        throws InvalidKeyException
    {
        this.random = random;
        engineInitSign(privateKey);
    }

    protected void engineInitSign(
        PrivateKey  privateKey)
        throws InvalidKeyException
    {
        CipherParameters    param = DSAUtil.generatePrivateKeyParameter(privateKey);

        if (random != null)
        {
            param = new ParametersWithRandom(param, random);
        }

        digest.reset();
        signer.init(true, param);
    }

    protected void engineUpdate(
        byte    b)
        throws SignatureException
    {
        digest.update(b);
    }

    protected void engineUpdate(
        byte[]  b,
        int     off,
        int     len)
        throws SignatureException
    {
        digest.update(b, off, len);
    }

    protected byte[] engineSign()
        throws SignatureException
    {
        byte[]  hash = new byte[digest.getDigestSize()];

        digest.doFinal(hash, 0);

        try
        {
            BigInteger[]    sig = signer.generateSignature(hash);

            return derEncode(sig[0], sig[1]);
        }
        catch (Exception e)
        {
            throw new SignatureException(e.toString());
        }
    }

    protected boolean engineVerify(
        byte[]  sigBytes)
        throws SignatureException
    {
        byte[]  hash = new byte[digest.getDigestSize()];

        digest.doFinal(hash, 0);

        BigInteger[]    sig;

        try
        {
            sig = derDecode(sigBytes);
        }
        catch (Exception e)
        {
            throw new SignatureException("error decoding signature bytes.");
        }

        return signer.verifySignature(hash, sig[0], sig[1]);
    }

    protected void engineSetParameter(
        AlgorithmParameterSpec params)
    {
        throw new UnsupportedOperationException("engineSetParameter unsupported");
    }

    /**
     * @deprecated replaced with <a href = "#engineSetParameter(java.security.spec.AlgorithmParameterSpec)">
     */
    protected void engineSetParameter(
        String  param,
        Object  value)
    {
        throw new UnsupportedOperationException("engineSetParameter unsupported");
    }

    /**
     * @deprecated
     */
    protected Object engineGetParameter(
        String      param)
    {
        throw new UnsupportedOperationException("engineSetParameter unsupported");
    }

    private byte[] derEncode(
        BigInteger  r,
        BigInteger  s)
        throws IOException
    {
        ASN1Integer[] rs = new ASN1Integer[]{ new ASN1Integer(r), new ASN1Integer(s) };
        return new DERSequence(rs).getEncoded(ASN1Encoding.DER);
    }

    private BigInteger[] derDecode(
        byte[]  encoding)
        throws IOException
    {
        ASN1Sequence s = (ASN1Sequence)ASN1Primitive.fromByteArray(encoding);
        if (s.size() != 2)
        {
            throw new IOException("malformed signature");
        }

        return new BigInteger[]{
            ((ASN1Integer)s.getObjectAt(0)).getValue(),
            ((ASN1Integer)s.getObjectAt(1)).getValue()
        };
    }

    static public class stdDSA
        extends DSASigner
    {
        public stdDSA()
        {
            super(new SHA1Digest(), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSA
        extends DSASigner
    {
        public detDSA()
        {
            super(new SHA1Digest(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA1Digest())));
        }
    }

    static public class dsa224
        extends DSASigner
    {
        public dsa224()
        {
            super(new SHA224Digest(), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSA224
        extends DSASigner
    {
        public detDSA224()
        {
            super(new SHA224Digest(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA224Digest())));
        }
    }

    static public class dsa256
        extends DSASigner
    {
        public dsa256()
        {
            super(new SHA256Digest(), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSA256
        extends DSASigner
    {
        public detDSA256()
        {
            super(new SHA256Digest(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA256Digest())));
        }
    }

    static public class dsa384
        extends DSASigner
    {
        public dsa384()
        {
            super(new SHA384Digest(), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSA384
        extends DSASigner
    {
        public detDSA384()
        {
            super(new SHA384Digest(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA384Digest())));
        }
    }

    static public class dsa512
        extends DSASigner
    {
        public dsa512()
        {
            super(new SHA512Digest(), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSA512
        extends DSASigner
    {
        public detDSA512()
        {
            super(new SHA512Digest(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA512Digest())));
        }
    }

    static public class dsaSha3_224
        extends DSASigner
    {
        public dsaSha3_224()
        {
            super(new SHA3Digest(224), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSASha3_224
        extends DSASigner
    {
        public detDSASha3_224()
        {
            super(new SHA3Digest(224), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA3Digest(224))));
        }
    }

    static public class dsaSha3_256
        extends DSASigner
    {
        public dsaSha3_256()
        {
            super(new SHA3Digest(256), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSASha3_256
        extends DSASigner
    {
        public detDSASha3_256()
        {
            super(new SHA3Digest(256), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA3Digest(256))));
        }
    }

    static public class dsaSha3_384
        extends DSASigner
    {
        public dsaSha3_384()
        {
            super(new SHA3Digest(384), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSASha3_384
        extends DSASigner
    {
        public detDSASha3_384()
        {
            super(new SHA3Digest(384), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA3Digest(384))));
        }
    }

    static public class dsaSha3_512
        extends DSASigner
    {
        public dsaSha3_512()
        {
            super(new SHA3Digest(512), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }

    static public class detDSASha3_512
        extends DSASigner
    {
        public detDSASha3_512()
        {
            super(new SHA3Digest(512), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(new SHA3Digest(512))));
        }
    }

    static public class noneDSA
        extends DSASigner
    {
        public noneDSA()
        {
            super(new NullDigest(), new org.bouncycastle.crypto.signers.DSASigner());
        }
    }
}

## 内容4
### 文件路径：
prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/ec/SignatureSpi.java
### 代码内容：
package org.bouncycastle.jcajce.provider.asymmetric.ec;

import java.io.IOException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DSA;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.NullDigest;
import org.bouncycastle.crypto.digests.RIPEMD160Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.digests.SHA224Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.digests.SHA384Digest;
import org.bouncycastle.crypto.digests.SHA3Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.ECDSASigner;
import org.bouncycastle.crypto.signers.ECNRSigner;
import org.bouncycastle.crypto.signers.HMacDSAKCalculator;
import org.bouncycastle.jcajce.provider.asymmetric.util.DSABase;
import org.bouncycastle.jcajce.provider.asymmetric.util.DSAEncoder;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;

public class SignatureSpi
    extends DSABase
{
    SignatureSpi(Digest digest, DSA signer, DSAEncoder encoder)
    {
        super(digest, signer, encoder);
    }

    protected void engineInitVerify(PublicKey publicKey)
        throws InvalidKeyException
    {
        CipherParameters param = ECUtils.generatePublicKeyParameter(publicKey);

        digest.reset();
        signer.init(false, param);
    }

    protected void engineInitSign(
        PrivateKey privateKey)
        throws InvalidKeyException
    {
        CipherParameters param = ECUtil.generatePrivateKeyParameter(privateKey);

        digest.reset();

        if (appRandom != null)
        {
            signer.init(true, new ParametersWithRandom(param, appRandom));
        }
        else
        {
            signer.init(true, param);
        }
    }

    static public class ecDSA
        extends SignatureSpi
    {
        public ecDSA()
        {
            super(new SHA1Digest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSA
        extends SignatureSpi
    {
        public ecDetDSA()
        {
            super(new SHA1Digest(), new ECDSASigner(new HMacDSAKCalculator(new SHA1Digest())), new StdDSAEncoder());
        }
    }

    static public class ecDSAnone
        extends SignatureSpi
    {
        public ecDSAnone()
        {
            super(new NullDigest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDSA224
        extends SignatureSpi
    {
        public ecDSA224()
        {
            super(new SHA224Digest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSA224
        extends SignatureSpi
    {
        public ecDetDSA224()
        {
            super(new SHA224Digest(), new ECDSASigner(new HMacDSAKCalculator(new SHA224Digest())), new StdDSAEncoder());
        }
    }

    static public class ecDSA256
        extends SignatureSpi
    {
        public ecDSA256()
        {
            super(new SHA256Digest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSA256
        extends SignatureSpi
    {
        public ecDetDSA256()
        {
            super(new SHA256Digest(), new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest())), new StdDSAEncoder());
        }
    }

    static public class ecDSA384
        extends SignatureSpi
    {
        public ecDSA384()
        {
            super(new SHA384Digest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSA384
        extends SignatureSpi
    {
        public ecDetDSA384()
        {
            super(new SHA384Digest(), new ECDSASigner(new HMacDSAKCalculator(new SHA384Digest())), new StdDSAEncoder());
        }
    }

    static public class ecDSA512
        extends SignatureSpi
    {
        public ecDSA512()
        {
            super(new SHA512Digest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSA512
        extends SignatureSpi
    {
        public ecDetDSA512()
        {
            super(new SHA512Digest(), new ECDSASigner(new HMacDSAKCalculator(new SHA512Digest())), new StdDSAEncoder());
        }
    }

    static public class ecDSASha3_224
        extends SignatureSpi
    {
        public ecDSASha3_224()
        {
            super(new SHA3Digest(224), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSASha3_224
        extends SignatureSpi
    {
        public ecDetDSASha3_224()
        {
            super(new SHA3Digest(224), new ECDSASigner(new HMacDSAKCalculator(new SHA3Digest(224))), new StdDSAEncoder());
        }
    }

    static public class ecDSASha3_256
        extends SignatureSpi
    {
        public ecDSASha3_256()
        {
            super(new SHA3Digest(256), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSASha3_256
        extends SignatureSpi
    {
        public ecDetDSASha3_256()
        {
            super(new SHA3Digest(256), new ECDSASigner(new HMacDSAKCalculator(new SHA3Digest(256))), new StdDSAEncoder());
        }
    }

    static public class ecDSASha3_384
        extends SignatureSpi
    {
        public ecDSASha3_384()
        {
            super(new SHA3Digest(384), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSASha3_384
        extends SignatureSpi
    {
        public ecDetDSASha3_384()
        {
            super(new SHA3Digest(384), new ECDSASigner(new HMacDSAKCalculator(new SHA3Digest(384))), new StdDSAEncoder());
        }
    }

    static public class ecDSASha3_512
        extends SignatureSpi
    {
        public ecDSASha3_512()
        {
            super(new SHA3Digest(512), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecDetDSASha3_512
        extends SignatureSpi
    {
        public ecDetDSASha3_512()
        {
            super(new SHA3Digest(512), new ECDSASigner(new HMacDSAKCalculator(new SHA3Digest(512))), new StdDSAEncoder());
        }
    }

    static public class ecDSARipeMD160
        extends SignatureSpi
    {
        public ecDSARipeMD160()
        {
            super(new RIPEMD160Digest(), new ECDSASigner(), new StdDSAEncoder());
        }
    }

    static public class ecNR
        extends SignatureSpi
    {
        public ecNR()
        {
            super(new SHA1Digest(), new ECNRSigner(), new StdDSAEncoder());
        }
    }

    static public class ecNR224
        extends SignatureSpi
    {
        public ecNR224()
        {
            super(new SHA224Digest(), new ECNRSigner(), new StdDSAEncoder());
        }
    }

    static public class ecNR256
        extends SignatureSpi
    {
        public ecNR256()
        {
            super(new SHA256Digest(), new ECNRSigner(), new StdDSAEncoder());
        }
    }

    static public class ecNR384
        extends SignatureSpi
    {
        public ecNR384()
        {
            super(new SHA384Digest(), new ECNRSigner(), new StdDSAEncoder());
        }
    }

    static public class ecNR512
        extends SignatureSpi
    {
        public ecNR512()
        {
            super(new SHA512Digest(), new ECNRSigner(), new StdDSAEncoder());
        }
    }

    static public class ecCVCDSA
        extends SignatureSpi
    {
        public ecCVCDSA()
        {
            super(new SHA1Digest(), new ECDSASigner(), new PlainDSAEncoder());
        }
    }

    static public class ecCVCDSA224
        extends SignatureSpi
    {
        public ecCVCDSA224()
        {
            super(new SHA224Digest(), new ECDSASigner(), new PlainDSAEncoder());
        }
    }

    static public class ecCVCDSA256
        extends SignatureSpi
    {
        public ecCVCDSA256()
        {
            super(new SHA256Digest(), new ECDSASigner(), new PlainDSAEncoder());
        }
    }

    static public class ecCVCDSA384
        extends SignatureSpi
    {
        public ecCVCDSA384()
        {
            super(new SHA384Digest(), new ECDSASigner(), new PlainDSAEncoder());
        }
    }

    static public class ecCVCDSA512
        extends SignatureSpi
    {
        public ecCVCDSA512()
        {
            super(new SHA512Digest(), new ECDSASigner(), new PlainDSAEncoder());
        }
    }

    static public class ecPlainDSARP160
        extends SignatureSpi
    {
        public ecPlainDSARP160()
        {
            super(new RIPEMD160Digest(), new ECDSASigner(), new PlainDSAEncoder());
        }
    }

    private static class StdDSAEncoder
        implements DSAEncoder
    {
        public byte[] encode(
            BigInteger r,
            BigInteger s)
            throws IOException
        {
            ASN1EncodableVector v = new ASN1EncodableVector();

            v.add(new ASN1Integer(r));
            v.add(new ASN1Integer(s));

            return new DERSequence(v).getEncoded(ASN1Encoding.DER);
        }

        public BigInteger[] decode(
            byte[] encoding)
            throws IOException
        {
            ASN1Sequence s = (ASN1Sequence)ASN1Primitive.fromByteArray(encoding);
            BigInteger[] sig = new BigInteger[2];

            sig[0] = ASN1Integer.getInstance(s.getObjectAt(0)).getValue();
            sig[1] = ASN1Integer.getInstance(s.getObjectAt(1)).getValue();

            return sig;
        }
    }

    private static class PlainDSAEncoder
        implements DSAEncoder
    {
        public byte[] encode(
            BigInteger r,
            BigInteger s)
            throws IOException
        {
            byte[] first = makeUnsigned(r);
            byte[] second = makeUnsigned(s);
            byte[] res;

            if (first.length > second.length)
            {
                res = new byte[first.length * 2];
            }
            else
            {
                res = new byte[second.length * 2];
            }

            System.arraycopy(first, 0, res, res.length / 2 - first.length, first.length);
            System.arraycopy(second, 0, res, res.length - second.length, second.length);

            return res;
        }

        private byte[] makeUnsigned(BigInteger val)
        {
            byte[] res = val.toByteArray();

            if (res[0] == 0)
            {
                byte[] tmp = new byte[res.length - 1];

                System.arraycopy(res, 1, tmp, 0, tmp.length);

                return tmp;
            }

            return res;
        }

        public BigInteger[] decode(
            byte[] encoding)
            throws IOException
        {
            BigInteger[] sig = new BigInteger[2];

            byte[] first = new byte[encoding.length / 2];
            byte[] second = new byte[encoding.length / 2];

            System.arraycopy(encoding, 0, first, 0, first.length);
            System.arraycopy(encoding, first.length, second, 0, second.length);

            sig[0] = new BigInteger(1, first);
            sig[1] = new BigInteger(1, second);

            return sig;
        }
    }
}

Output:
【漏洞类型】整数溢出与签名验证漏洞
【严重性】High
【漏洞摘要】原始代码中，`ASN1Enumerated`和`ASN1Integer`类在构造函数中处理BigInteger的字节数组时，没有对字节数组的前导零和前导负数进行充分的验证。这可能导致整数溢出或其他未定义行为，影响系统的安全性和稳定性。此外，`DSASigner`和`SignatureSpi`类在解析和验证DSA和ECDSA签名时，没有验证DER编码序列的完整性，这可能使系统容易受到注入攻击或其他形式的攻击。
【关键代码模式】与BigInteger字节数组处理相关的构造函数、与签名解析相关的`derDecode`方法。
【修复方法说明】修复方法通过在构造函数中添加对字节数组前导零和负数的验证，防止整数溢出。同时，在`derDecode`方法中添加了对DER编码序列完整性验证的检查，提高了签名验证的安全性。