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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.spec.*; | |
| 33 | + | |
| 34 | +import sun.security.util.*; | |
| 35 | + | |
| 36 | +/** | |
| 37 | + * This class implements encoding and decoding of Elliptic Curve parameters | |
| 38 | + * as specified in RFC 3279. | |
| 39 | + * | |
| 40 | + * However, only named curves are currently supported. | |
| 41 | + * | |
| 42 | + * ASN.1 from RFC 3279 follows. Note that X9.62 (2005) has added some additional | |
| 43 | + * options. | |
| 44 | + * | |
| 45 | + * <pre> | |
| 46 | + * EcpkParameters ::= CHOICE { | |
| 47 | + * ecParameters ECParameters, | |
| 48 | + * namedCurve OBJECT IDENTIFIER, | |
| 49 | + * implicitlyCA NULL } | |
| 50 | + * | |
| 51 | + * ECParameters ::= SEQUENCE { | |
| 52 | + * version ECPVer, -- version is always 1 | |
| 53 | + * fieldID FieldID, -- identifies the finite field over | |
| 54 | + * -- which the curve is defined | |
| 55 | + * curve Curve, -- coefficients a and b of the | |
| 56 | + * -- elliptic curve | |
| 57 | + * base ECPoint, -- specifies the base point P | |
| 58 | + * -- on the elliptic curve | |
| 59 | + * order INTEGER, -- the order n of the base point | |
| 60 | + * cofactor INTEGER OPTIONAL -- The integer h = #E(Fq)/n | |
| 61 | + * } | |
| 62 | + * | |
| 63 | + * ECPVer ::= INTEGER {ecpVer1(1)} | |
| 64 | + * | |
| 65 | + * Curve ::= SEQUENCE { | |
| 66 | + * a FieldElement, | |
| 67 | + * b FieldElement, | |
| 68 | + * seed BIT STRING OPTIONAL } | |
| 69 | + * | |
| 70 | + * FieldElement ::= OCTET STRING | |
| 71 | + * | |
| 72 | + * ECPoint ::= OCTET STRING | |
| 73 | + * </pre> | |
| 74 | + * | |
| 75 | + * @since 1.6 | |
| 76 | + * @author Andreas Sterbenz | |
| 77 | + */ | |
| 78 | +public final class ECParameters extends AlgorithmParametersSpi { | |
| 79 | + | |
| 80 | + public ECParameters() { | |
| 81 | + // empty | |
| 82 | + } | |
| 83 | + | |
| 84 | + // Used by SunPKCS11 and SunJSSE. | |
| 85 | + public static ECPoint decodePoint(byte[] data, EllipticCurve curve) | |
| 86 | + throws IOException { | |
| 87 | + if ((data.length == 0) || (data[0] != 4)) { | |
| 88 | + throw new IOException("Only uncompressed point format supported"); | |
| 89 | + } | |
| 90 | + int n = (curve.getField().getFieldSize() + 7 ) >> 3; | |
| 91 | + if (data.length != (n * 2) + 1) { | |
| 92 | + throw new IOException("Point does not match field size"); | |
| 93 | + } | |
| 94 | + byte[] xb = new byte[n]; | |
| 95 | + byte[] yb = new byte[n]; | |
| 96 | + System.arraycopy(data, 1, xb, 0, n); | |
| 97 | + System.arraycopy(data, n + 1, yb, 0, n); | |
| 98 | + return new ECPoint(new BigInteger(1, xb), new BigInteger(1, yb)); | |
| 99 | + } | |
| 100 | + | |
| 101 | + // Used by SunPKCS11 and SunJSSE. | |
| 102 | + public static byte[] encodePoint(ECPoint point, EllipticCurve curve) { | |
| 103 | + // get field size in bytes (rounding up) | |
| 104 | + int n = (curve.getField().getFieldSize() + 7) >> 3; | |
| 105 | + byte[] xb = trimZeroes(point.getAffineX().toByteArray()); | |
| 106 | + byte[] yb = trimZeroes(point.getAffineY().toByteArray()); | |
| 107 | + if ((xb.length > n) || (yb.length > n)) { | |
| 108 | + throw new RuntimeException | |
| 109 | + ("Point coordinates do not match field size"); | |
| 110 | + } | |
| 111 | + byte[] b = new byte[1 + (n << 1)]; | |
| 112 | + b[0] = 4; // uncompressed | |
| 113 | + System.arraycopy(xb, 0, b, n - xb.length + 1, xb.length); | |
| 114 | + System.arraycopy(yb, 0, b, b.length - yb.length, yb.length); | |
| 115 | + return b; | |
| 116 | + } | |
| 117 | + | |
| 118 | + // Copied from the SunPKCS11 code - should be moved to a common location. | |
| 119 | + // trim leading (most significant) zeroes from the result | |
| 120 | + static byte[] trimZeroes(byte[] b) { | |
| 121 | + int i = 0; | |
| 122 | + while ((i < b.length - 1) && (b[i] == 0)) { | |
| 123 | + i++; | |
| 124 | + } | |
| 125 | + if (i == 0) { | |
| 126 | + return b; | |
| 127 | + } | |
| 128 | + byte[] t = new byte[b.length - i]; | |
| 129 | + System.arraycopy(b, i, t, 0, t.length); | |
| 130 | + return t; | |
| 131 | + } | |
| 132 | + | |
| 133 | + // Convert the given ECParameterSpec object to a NamedCurve object. | |
| 134 | + // If params does not represent a known named curve, return null. | |
| 135 | + // Used by SunPKCS11. | |
| 136 | + public static NamedCurve getNamedCurve(ECParameterSpec params) { | |
| 137 | + if ((params instanceof NamedCurve) || (params == null)) { | |
| 138 | + return (NamedCurve)params; | |
| 139 | + } | |
| 140 | + // This is a hack to allow SunJSSE to work with 3rd party crypto | |
| 141 | + // providers for ECC and not just SunPKCS11. | |
| 142 | + // This can go away once we decide how to expose curve names in the | |
| 143 | + // public API. | |
| 144 | + // Note that it assumes that the 3rd party provider encodes named | |
| 145 | + // curves using the short form, not explicitly. If it did that, then | |
| 146 | + // the SunJSSE TLS ECC extensions are wrong, which could lead to | |
| 147 | + // interoperability problems. | |
| 148 | + int fieldSize = params.getCurve().getField().getFieldSize(); | |
| 149 | + for (ECParameterSpec namedCurve : NamedCurve.knownECParameterSpecs()) { | |
| 150 | + // ECParameterSpec does not define equals, so check all the | |
| 151 | + // components ourselves. | |
| 152 | + // Quick field size check first | |
| 153 | + if (namedCurve.getCurve().getField().getFieldSize() != fieldSize) { | |
| 154 | + continue; | |
| 155 | + } | |
| 156 | + if (namedCurve.getCurve().equals(params.getCurve()) == false) { | |
| 157 | + continue; | |
| 158 | + } | |
| 159 | + if (namedCurve.getGenerator().equals(params.getGenerator()) == false) { | |
| 160 | + continue; | |
| 161 | + } | |
| 162 | + if (namedCurve.getOrder().equals(params.getOrder()) == false) { | |
| 163 | + continue; | |
| 164 | + } | |
| 165 | + if (namedCurve.getCofactor() != params.getCofactor()) { | |
| 166 | + continue; | |
| 167 | + } | |
| 168 | + // everything matches our named curve, return it | |
| 169 | + return (NamedCurve)namedCurve; | |
| 170 | + } | |
| 171 | + // no match found | |
| 172 | + return null; | |
| 173 | + } | |
| 174 | + | |
| 175 | + // Used by SunJSSE. | |
| 176 | + public static String getCurveName(ECParameterSpec params) { | |
| 177 | + NamedCurve curve = getNamedCurve(params); | |
| 178 | + return (curve == null) ? null : curve.getObjectIdentifier().toString(); | |
| 179 | + } | |
| 180 | + | |
| 181 | + // Used by SunPKCS11. | |
| 182 | + public static byte[] encodeParameters(ECParameterSpec params) { | |
| 183 | + NamedCurve curve = getNamedCurve(params); | |
| 184 | + if (curve == null) { | |
| 185 | + throw new RuntimeException("Not a known named curve: " + params); | |
| 186 | + } | |
| 187 | + return curve.getEncoded(); | |
| 188 | + } | |
| 189 | + | |
| 190 | + // Used by SunPKCS11. | |
| 191 | + public static ECParameterSpec decodeParameters(byte[] params) throws IOException { | |
| 192 | + DerValue encodedParams = new DerValue(params); | |
| 193 | + if (encodedParams.tag == DerValue.tag_ObjectId) { | |
| 194 | + ObjectIdentifier oid = encodedParams.getOID(); | |
| 195 | + ECParameterSpec spec = NamedCurve.getECParameterSpec(oid); | |
| 196 | + if (spec == null) { | |
| 197 | + throw new IOException("Unknown named curve: " + oid); | |
| 198 | + } | |
| 199 | + return spec; | |
| 200 | + } | |
| 201 | + | |
| 202 | + throw new IOException("Only named ECParameters supported"); | |
| 203 | + | |
| 204 | + // The code below is incomplete. | |
| 205 | + // It is left as a starting point for a complete parsing implementation. | |
| 206 | + | |
| 207 | +/* | |
| 208 | + if (encodedParams.tag != DerValue.tag_Sequence) { | |
| 209 | + throw new IOException("Unsupported EC parameters, tag: " + encodedParams.tag); | |
| 210 | + } | |
| 211 | + | |
| 212 | + encodedParams.data.reset(); | |
| 213 | + | |
| 214 | + DerInputStream in = encodedParams.data; | |
| 215 | + | |
| 216 | + int version = in.getInteger(); | |
| 217 | + if (version != 1) { | |
| 218 | + throw new IOException("Unsupported EC parameters version: " + version); | |
| 219 | + } | |
| 220 | + ECField field = parseField(in); | |
| 221 | + EllipticCurve curve = parseCurve(in, field); | |
| 222 | + ECPoint point = parsePoint(in, curve); | |
| 223 | + | |
| 224 | + BigInteger order = in.getBigInteger(); | |
| 225 | + int cofactor = 0; | |
| 226 | + | |
| 227 | + if (in.available() != 0) { | |
| 228 | + cofactor = in.getInteger(); | |
| 229 | + } | |
| 230 | + | |
| 231 | + // XXX HashAlgorithm optional | |
| 232 | + | |
| 233 | + if (encodedParams.data.available() != 0) { | |
| 234 | + throw new IOException("encoded params have " + | |
| 235 | + encodedParams.data.available() + | |
| 236 | + " extra bytes"); | |
| 237 | + } | |
| 238 | + | |
| 239 | + return new ECParameterSpec(curve, point, order, cofactor); | |
| 240 | +*/ | |
| 241 | + } | |
| 242 | + | |
| 243 | +/* | |
| 244 | + private static final ObjectIdentifier fieldTypePrime = | |
| 245 | + ObjectIdentifier.newInternal(new int[] {1, 2, 840, 10045, 1, 1}); | |
| 246 | + | |
| 247 | + private static final ObjectIdentifier fieldTypeChar2 = | |
| 248 | + ObjectIdentifier.newInternal(new int[] {1, 2, 840, 10045, 1, 2}); | |
| 249 | + | |
| 250 | + private static ECField parseField(DerInputStream in) throws IOException { | |
| 251 | + DerValue v = in.getDerValue(); | |
| 252 | + ObjectIdentifier oid = v.data.getOID(); | |
| 253 | + if (oid.equals(fieldTypePrime) == false) { | |
| 254 | + throw new IOException("Only prime fields supported: " + oid); | |
| 255 | + } | |
| 256 | + BigInteger fieldSize = v.data.getBigInteger(); | |
| 257 | + return new ECFieldFp(fieldSize); | |
| 258 | + } | |
| 259 | + | |
| 260 | + private static EllipticCurve parseCurve(DerInputStream in, ECField field) | |
| 261 | + throws IOException { | |
| 262 | + DerValue v = in.getDerValue(); | |
| 263 | + byte[] ab = v.data.getOctetString(); | |
| 264 | + byte[] bb = v.data.getOctetString(); | |
| 265 | + return new EllipticCurve(field, new BigInteger(1, ab), new BigInteger(1, bb)); | |
| 266 | + } | |
| 267 | + | |
| 268 | + private static ECPoint parsePoint(DerInputStream in, EllipticCurve curve) | |
| 269 | + throws IOException { | |
| 270 | + byte[] data = in.getOctetString(); | |
| 271 | + return decodePoint(data, curve); | |
| 272 | + } | |
| 273 | +*/ | |
| 274 | + | |
| 275 | + // used by ECPublicKeyImpl and ECPrivateKeyImpl | |
| 276 | + static AlgorithmParameters getAlgorithmParameters(ECParameterSpec spec) | |
| 277 | + throws InvalidKeyException { | |
| 278 | + try { | |
| 279 | + AlgorithmParameters params = AlgorithmParameters.getInstance | |
| 280 | + ("EC", ECKeyFactory.ecInternalProvider); | |
| 281 | + params.init(spec); | |
| 282 | + return params; | |
| 283 | + } catch (GeneralSecurityException e) { | |
| 284 | + throw new InvalidKeyException("EC parameters error", e); | |
| 285 | + } | |
| 286 | + } | |
| 287 | + | |
| 288 | + // AlgorithmParameterSpi methods | |
| 289 | + | |
| 290 | + // The parameters these AlgorithmParameters object represents. | |
| 291 | + // Currently, it is always an instance of NamedCurve. | |
| 292 | + private ECParameterSpec paramSpec; | |
| 293 | + | |
| 294 | + protected void engineInit(AlgorithmParameterSpec paramSpec) | |
| 295 | + throws InvalidParameterSpecException { | |
| 296 | + if (paramSpec instanceof ECParameterSpec) { | |
| 297 | + this.paramSpec = getNamedCurve((ECParameterSpec)paramSpec); | |
| 298 | + if (this.paramSpec == null) { | |
| 299 | + throw new InvalidParameterSpecException | |
| 300 | + ("Not a supported named curve: " + paramSpec); | |
| 301 | + } | |
| 302 | + } else if (paramSpec instanceof ECGenParameterSpec) { | |
| 303 | + String name = ((ECGenParameterSpec)paramSpec).getName(); | |
| 304 | + ECParameterSpec spec = NamedCurve.getECParameterSpec(name); | |
| 305 | + if (spec == null) { | |
| 306 | + throw new InvalidParameterSpecException("Unknown curve: " + name); | |
| 307 | + } | |
| 308 | + this.paramSpec = spec; | |
| 309 | + } else if (paramSpec == null) { | |
| 310 | + throw new InvalidParameterSpecException | |
| 311 | + ("paramSpec must not be null"); | |
| 312 | + } else { | |
| 313 | + throw new InvalidParameterSpecException | |
| 314 | + ("Only ECParameterSpec and ECGenParameterSpec supported"); | |
| 315 | + } | |
| 316 | + } | |
| 317 | + | |
| 318 | + protected void engineInit(byte[] params) throws IOException { | |
| 319 | + paramSpec = decodeParameters(params); | |
| 320 | + } | |
| 321 | + | |
| 322 | + protected void engineInit(byte[] params, String decodingMethod) throws IOException { | |
| 323 | + engineInit(params); | |
| 324 | + } | |
| 325 | + | |
| 326 | + protected <T extends AlgorithmParameterSpec> T engineGetParameterSpec(Class<T> spec) | |
| 327 | + throws InvalidParameterSpecException { | |
| 328 | + if (spec.isAssignableFrom(ECParameterSpec.class)) { | |
| 329 | + return (T)paramSpec; | |
| 330 | + } else if (spec.isAssignableFrom(ECGenParameterSpec.class)) { | |
| 331 | + return (T)new ECGenParameterSpec(getCurveName(paramSpec)); | |
| 332 | + } else { | |
| 333 | + throw new InvalidParameterSpecException | |
| 334 | + ("Only ECParameterSpec and ECGenParameterSpec supported"); | |
| 335 | + } | |
| 336 | + } | |
| 337 | + | |
| 338 | + protected byte[] engineGetEncoded() throws IOException { | |
| 339 | + return encodeParameters(paramSpec); | |
| 340 | + } | |
| 341 | + | |
| 342 | + protected byte[] engineGetEncoded(String encodingMethod) throws IOException { | |
| 343 | + return engineGetEncoded(); | |
| 344 | + } | |
| 345 | + | |
| 346 | + protected String engineToString() { | |
| 347 | + return paramSpec.toString(); | |
| 348 | + } | |
| 349 | +} | |