J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | } |