jdk/src/java.base/share/classes/sun/security/pkcs/NamedPKCS8Key.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * accompanied this code).
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package sun.security.pkcs;

import sun.security.util.DerInputStream;
import sun.security.util.DerValue;
import sun.security.x509.AlgorithmId;

import javax.security.auth.DestroyFailedException;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serial;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.ProviderException;
import java.security.spec.NamedParameterSpec;
import java.util.Arrays;

/// Represents a private key from an algorithm family that is specialized
/// with a named parameter set.
///
/// This key is generated by either a [sun.security.provider.NamedKeyPairGenerator]
/// or [sun.security.provider.NamedKeyFactory]. Its [#getAlgorithm] method
/// returns the algorithm family name, while its [#getParams()] method returns
/// the parameter set name as a [NamedParameterSpec] object. The algorithm
/// identifier in the PKCS #8 encoding of the key is always a single OID derived
/// from the parameter set name.
///
/// @see sun.security.provider.NamedKeyPairGenerator
public final class NamedPKCS8Key extends PKCS8Key {
    @Serial
    private static final long serialVersionUID = 1L;

    private final String fname;
    private final transient NamedParameterSpec paramSpec;
    private final byte[] rawBytes;

    private transient boolean destroyed = false;

    /// Ctor from family name, parameter set name, raw key bytes.
    /// Key bytes won't be cloned, caller must relinquish ownership
    public NamedPKCS8Key(String fname, String pname, byte[] rawBytes) {
        this.fname = fname;
        this.paramSpec = new NamedParameterSpec(pname);
        try {
            this.algid = AlgorithmId.get(pname);
        } catch (NoSuchAlgorithmException e) {
            throw new ProviderException(e);
        }
        this.rawBytes = rawBytes;

        DerValue val = new DerValue(DerValue.tag_OctetString, rawBytes);
        try {
            this.privKeyMaterial = val.toByteArray();
        } finally {
            val.clear();
        }
    }

    /// Ctor from family name, and PKCS #8 bytes
    public NamedPKCS8Key(String fname, byte[] encoded) throws InvalidKeyException {
        super(encoded);
        this.fname = fname;
        try {
            paramSpec = new NamedParameterSpec(algid.getName());
            if (algid.getEncodedParams() != null) {
                throw new InvalidKeyException("algorithm identifier has params");
            }
            rawBytes = new DerInputStream(privKeyMaterial).getOctetString();
        } catch (IOException e) {
            throw new InvalidKeyException("Cannot parse input", e);
        }
    }

    @Override
    public String toString() {
        // Do not modify: this can be used by earlier JDKs that
        // do not have the getParams() method
        return paramSpec.getName() + " private key";
    }

    /// Returns the reference to the internal key. Caller must not modify
    /// the content or keep a reference.
    public byte[] getRawBytes() {
        return rawBytes;
    }

    @Override
    public NamedParameterSpec getParams() {
        return paramSpec;
    }

    @Override
    public String getAlgorithm() {
        return fname;
    }

    @java.io.Serial
    private void readObject(ObjectInputStream stream)
            throws IOException, ClassNotFoundException {
        throw new InvalidObjectException(
                "NamedPKCS8Key keys are not directly deserializable");
    }

    @Override
    public void destroy() throws DestroyFailedException {
        Arrays.fill(rawBytes, (byte)0);
        Arrays.fill(privKeyMaterial, (byte)0);
        if (encodedKey != null) {
            Arrays.fill(encodedKey, (byte)0);
        }
        destroyed = true;
    }

    @Override
    public boolean isDestroyed() {
        return destroyed;
    }
}