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package sun.security.ec;

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

import java.security.*;
import java.security.interfaces.*;
import java.security.spec.*;

import sun.security.util.*;
import sun.security.x509.AlgorithmId;
import sun.security.pkcs.PKCS8Key;

Key implementation for EC private keys. ASN.1 syntax for EC private keys from SEC 1 v1.5 (draft):
EXPLICIT TAGS
ECPrivateKey ::= SEQUENCE {
  version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
  privateKey OCTET STRING,
  parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL,
  publicKey [1] BIT STRING OPTIONAL
}
We currently ignore the optional parameters and publicKey fields. We require that the parameters are encoded as part of the AlgorithmIdentifier, not in the private key structure.
Author: Andreas Sterbenz
Since: 1.6
/** * Key implementation for EC private keys. * * ASN.1 syntax for EC private keys from SEC 1 v1.5 (draft): * * <pre> * EXPLICIT TAGS * * ECPrivateKey ::= SEQUENCE { * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), * privateKey OCTET STRING, * parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL, * publicKey [1] BIT STRING OPTIONAL * } * </pre> * * We currently ignore the optional parameters and publicKey fields. We * require that the parameters are encoded as part of the AlgorithmIdentifier, * not in the private key structure. * * @since 1.6 * @author Andreas Sterbenz */
public final class ECPrivateKeyImpl extends PKCS8Key implements ECPrivateKey { private static final long serialVersionUID = 88695385615075129L; private BigInteger s; // private value private ECParameterSpec params;
Construct a key from its encoding. Called by the ECKeyFactory and the SunPKCS11 code.
/** * Construct a key from its encoding. Called by the ECKeyFactory and * the SunPKCS11 code. */
public ECPrivateKeyImpl(byte[] encoded) throws InvalidKeyException { decode(encoded); }
Construct a key from its components. Used by the KeyFactory and the SunPKCS11 code.
/** * Construct a key from its components. Used by the * KeyFactory and the SunPKCS11 code. */
public ECPrivateKeyImpl(BigInteger s, ECParameterSpec params) throws InvalidKeyException { this.s = s; this.params = params; // generate the encoding algid = new AlgorithmId (AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params)); try { DerOutputStream out = new DerOutputStream(); out.putInteger(1); // version 1 byte[] privBytes = ECParameters.trimZeroes(s.toByteArray()); out.putOctetString(privBytes); DerValue val = new DerValue(DerValue.tag_Sequence, out.toByteArray()); key = val.toByteArray(); } catch (IOException exc) { // should never occur throw new InvalidKeyException(exc); } } // see JCA doc public String getAlgorithm() { return "EC"; } // see JCA doc public BigInteger getS() { return s; } // see JCA doc public ECParameterSpec getParams() { return params; }
Parse the key. Called by PKCS8Key.
/** * Parse the key. Called by PKCS8Key. */
protected void parseKeyBits() throws InvalidKeyException { try { DerInputStream in = new DerInputStream(key); DerValue derValue = in.getDerValue(); if (derValue.tag != DerValue.tag_Sequence) { throw new IOException("Not a SEQUENCE"); } DerInputStream data = derValue.data; int version = data.getInteger(); if (version != 1) { throw new IOException("Version must be 1"); } byte[] privData = data.getOctetString(); s = new BigInteger(1, privData); while (data.available() != 0) { DerValue value = data.getDerValue(); if (value.isContextSpecific((byte)0)) { // ignore for now } else if (value.isContextSpecific((byte)1)) { // ignore for now } else { throw new InvalidKeyException("Unexpected value: " + value); } } AlgorithmParameters algParams = this.algid.getParameters(); if (algParams == null) { throw new InvalidKeyException("EC domain parameters must be " + "encoded in the algorithm identifier"); } params = algParams.getParameterSpec(ECParameterSpec.class); } catch (IOException e) { throw new InvalidKeyException("Invalid EC private key", e); } catch (InvalidParameterSpecException e) { throw new InvalidKeyException("Invalid EC private key", e); } } }