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| 1 | /* | ||
| 2 | * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.security.ec; | ||
| 27 | |||
| 28 | import java.io.IOException; | ||
| 29 | import java.math.BigInteger; | ||
| 30 | |||
| 31 | import java.security.*; | ||
| 32 | import java.security.interfaces.*; | ||
| 33 | import java.security.spec.*; | ||
| 34 | |||
| 35 | import sun.security.util.*; | ||
| 36 | import sun.security.x509.AlgorithmId; | ||
| 37 | import sun.security.pkcs.PKCS8Key; | ||
| 38 | |||
| 39 | /** | ||
| 40 | * Key implementation for EC private keys. | ||
| 41 | * | ||
| 42 | * ASN.1 syntax for EC private keys from SEC 1 v1.5 (draft): | ||
| 43 | * | ||
| 44 | * <pre> | ||
| 45 | * EXPLICIT TAGS | ||
| 46 | * | ||
| 47 | * ECPrivateKey ::= SEQUENCE { | ||
| 48 | * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), | ||
| 49 | * privateKey OCTET STRING, | ||
| 50 | * parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL, | ||
| 51 | * publicKey [1] BIT STRING OPTIONAL | ||
| 52 | * } | ||
| 53 | * </pre> | ||
| 54 | * | ||
| 55 | * We currently ignore the optional parameters and publicKey fields. We | ||
| 56 | * require that the parameters are encoded as part of the AlgorithmIdentifier, | ||
| 57 | * not in the private key structure. | ||
| 58 | * | ||
| 59 | * @since 1.6 | ||
| 60 | * @author Andreas Sterbenz | ||
| 61 | */ | ||
| 62 | public final class ECPrivateKeyImpl extends PKCS8Key implements ECPrivateKey { | ||
| 63 | |||
| 64 | private static final long serialVersionUID = 88695385615075129L; | ||
| 65 | |||
| 66 | private BigInteger s; // private value | ||
| 67 | private ECParameterSpec params; | ||
| 68 | |||
| 69 | /** | ||
| 70 | * Construct a key from its encoding. Called by the ECKeyFactory and | ||
| 71 | * the SunPKCS11 code. | ||
| 72 | */ | ||
| 73 | public ECPrivateKeyImpl(byte[] encoded) throws InvalidKeyException { | ||
| 74 | decode(encoded); | ||
| 75 | } | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Construct a key from its components. Used by the | ||
| 79 | * KeyFactory and the SunPKCS11 code. | ||
| 80 | */ | ||
| 81 | public ECPrivateKeyImpl(BigInteger s, ECParameterSpec params) | ||
| 82 | throws InvalidKeyException { | ||
| 83 | this.s = s; | ||
| 84 | this.params = params; | ||
| 85 | // generate the encoding | ||
| 86 | algid = new AlgorithmId | ||
| 87 | (AlgorithmId.EC_oid, ECParameters.getAlgorithmParameters(params)); | ||
| 88 | try { | ||
| 89 | DerOutputStream out = new DerOutputStream(); | ||
| 90 | out.putInteger(1); // version 1 | ||
| 91 | byte[] privBytes = ECParameters.trimZeroes(s.toByteArray()); | ||
| 92 | out.putOctetString(privBytes); | ||
| 93 | DerValue val = | ||
| 94 | new DerValue(DerValue.tag_Sequence, out.toByteArray()); | ||
| 95 | key = val.toByteArray(); | ||
| 96 | } catch (IOException exc) { | ||
| 97 | // should never occur | ||
| 98 | throw new InvalidKeyException(exc); | ||
| 99 | } | ||
| 100 | } | ||
| 101 | |||
| 102 | // see JCA doc | ||
| 103 | public String getAlgorithm() { | ||
| 104 | return "EC"; | ||
| 105 | } | ||
| 106 | |||
| 107 | // see JCA doc | ||
| 108 | public BigInteger getS() { | ||
| 109 | return s; | ||
| 110 | } | ||
| 111 | |||
| 112 | // see JCA doc | ||
| 113 | public ECParameterSpec getParams() { | ||
| 114 | return params; | ||
| 115 | } | ||
| 116 | |||
| 117 | /** | ||
| 118 | * Parse the key. Called by PKCS8Key. | ||
| 119 | */ | ||
| 120 | protected void parseKeyBits() throws InvalidKeyException { | ||
| 121 | try { | ||
| 122 | DerInputStream in = new DerInputStream(key); | ||
| 123 | DerValue derValue = in.getDerValue(); | ||
| 124 | if (derValue.tag != DerValue.tag_Sequence) { | ||
| 125 | throw new IOException("Not a SEQUENCE"); | ||
| 126 | } | ||
| 127 | DerInputStream data = derValue.data; | ||
| 128 | int version = data.getInteger(); | ||
| 129 | if (version != 1) { | ||
| 130 | throw new IOException("Version must be 1"); | ||
| 131 | } | ||
| 132 | byte[] privData = data.getOctetString(); | ||
| 133 | s = new BigInteger(1, privData); | ||
| 134 | while (data.available() != 0) { | ||
| 135 | DerValue value = data.getDerValue(); | ||
| 136 | if (value.isContextSpecific((byte)0)) { | ||
| 137 | // ignore for now | ||
| 138 | } else if (value.isContextSpecific((byte)1)) { | ||
| 139 | // ignore for now | ||
| 140 | } else { | ||
| 141 | throw new InvalidKeyException("Unexpected value: " + value); | ||
| 142 | } | ||
| 143 | } | ||
| 144 | AlgorithmParameters algParams = this.algid.getParameters(); | ||
| 145 | if (algParams == null) { | ||
| 146 | throw new InvalidKeyException("EC domain parameters must be " | ||
| 147 | + "encoded in the algorithm identifier"); | ||
| 148 | } | ||
| 149 | params = algParams.getParameterSpec(ECParameterSpec.class); | ||
| 150 | } catch (IOException e) { | ||
| 151 | throw new InvalidKeyException("Invalid EC private key", e); | ||
| 152 | } catch (InvalidParameterSpecException e) { | ||
| 153 | throw new InvalidKeyException("Invalid EC private key", e); | ||
| 154 | } | ||
| 155 | } | ||
| 156 | |||
| 157 | // return a string representation of this key for debugging | ||
| 158 | public String toString() { | ||
| 159 | return "Sun EC private key, " + params.getCurve().getField().getFieldSize() | ||
| 160 | + " bits\n private value: " | ||
| 161 | + s + "\n parameters: " + params; | ||
| 162 | } | ||
| 163 | |||
| 164 | } | ||