| /* |
| * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.util; |
| |
| import java.io.IOException; |
| |
| import java.math.BigInteger; |
| |
| import java.security.*; |
| |
| import java.security.interfaces.*; |
| |
| import java.security.spec.*; |
| |
| import java.util.Arrays; |
| |
| import sun.security.x509.X509Key; |
| |
| public class ECUtil { |
| |
| // Used by SunPKCS11 and SunJSSE. |
| public static ECPoint decodePoint(byte[] data, EllipticCurve curve) |
| throws IOException { |
| if ((data.length == 0) || (data[0] != 4)) { |
| throw new IOException("Only uncompressed point format supported"); |
| } |
| // Per ANSI X9.62, an encoded point is a 1 byte type followed by |
| // ceiling(log base 2 field-size / 8) bytes of x and the same of y. |
| int n = (data.length - 1) / 2; |
| if (n != ((curve.getField().getFieldSize() + 7 ) >> 3)) { |
| throw new IOException("Point does not match field size"); |
| } |
| |
| byte[] xb = Arrays.copyOfRange(data, 1, 1 + n); |
| byte[] yb = Arrays.copyOfRange(data, n + 1, n + 1 + n); |
| |
| return new ECPoint(new BigInteger(1, xb), new BigInteger(1, yb)); |
| } |
| |
| // Used by SunPKCS11 and SunJSSE. |
| public static byte[] encodePoint(ECPoint point, EllipticCurve curve) { |
| // get field size in bytes (rounding up) |
| int n = (curve.getField().getFieldSize() + 7) >> 3; |
| byte[] xb = trimZeroes(point.getAffineX().toByteArray()); |
| byte[] yb = trimZeroes(point.getAffineY().toByteArray()); |
| if ((xb.length > n) || (yb.length > n)) { |
| throw new RuntimeException |
| ("Point coordinates do not match field size"); |
| } |
| byte[] b = new byte[1 + (n << 1)]; |
| b[0] = 4; // uncompressed |
| System.arraycopy(xb, 0, b, n - xb.length + 1, xb.length); |
| System.arraycopy(yb, 0, b, b.length - yb.length, yb.length); |
| return b; |
| } |
| |
| public static byte[] trimZeroes(byte[] b) { |
| int i = 0; |
| while ((i < b.length - 1) && (b[i] == 0)) { |
| i++; |
| } |
| if (i == 0) { |
| return b; |
| } |
| |
| return Arrays.copyOfRange(b, i, b.length); |
| } |
| |
| private static KeyFactory getKeyFactory() { |
| try { |
| return KeyFactory.getInstance("EC", "SunEC"); |
| } catch (NoSuchAlgorithmException | NoSuchProviderException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public static ECPublicKey decodeX509ECPublicKey(byte[] encoded) |
| throws InvalidKeySpecException { |
| KeyFactory keyFactory = getKeyFactory(); |
| X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encoded); |
| |
| return (ECPublicKey)keyFactory.generatePublic(keySpec); |
| } |
| |
| public static byte[] x509EncodeECPublicKey(ECPoint w, |
| ECParameterSpec params) throws InvalidKeySpecException { |
| KeyFactory keyFactory = getKeyFactory(); |
| ECPublicKeySpec keySpec = new ECPublicKeySpec(w, params); |
| X509Key key = (X509Key)keyFactory.generatePublic(keySpec); |
| |
| return key.getEncoded(); |
| } |
| |
| public static ECPrivateKey decodePKCS8ECPrivateKey(byte[] encoded) |
| throws InvalidKeySpecException { |
| KeyFactory keyFactory = getKeyFactory(); |
| PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded); |
| |
| return (ECPrivateKey)keyFactory.generatePrivate(keySpec); |
| } |
| |
| public static ECPrivateKey generateECPrivateKey(BigInteger s, |
| ECParameterSpec params) throws InvalidKeySpecException { |
| KeyFactory keyFactory = getKeyFactory(); |
| ECPrivateKeySpec keySpec = new ECPrivateKeySpec(s, params); |
| |
| return (ECPrivateKey)keyFactory.generatePrivate(keySpec); |
| } |
| |
| public static AlgorithmParameters getECParameters(Provider p) { |
| try { |
| if (p != null) { |
| return AlgorithmParameters.getInstance("EC", p); |
| } |
| |
| return AlgorithmParameters.getInstance("EC"); |
| } catch (NoSuchAlgorithmException nsae) { |
| throw new RuntimeException(nsae); |
| } |
| } |
| |
| public static byte[] encodeECParameterSpec(Provider p, |
| ECParameterSpec spec) { |
| AlgorithmParameters parameters = getECParameters(p); |
| |
| try { |
| parameters.init(spec); |
| } catch (InvalidParameterSpecException ipse) { |
| throw new RuntimeException("Not a known named curve: " + spec); |
| } |
| |
| try { |
| return parameters.getEncoded(); |
| } catch (IOException ioe) { |
| // it is a bug if this should happen |
| throw new RuntimeException(ioe); |
| } |
| } |
| |
| public static ECParameterSpec getECParameterSpec(Provider p, |
| ECParameterSpec spec) { |
| AlgorithmParameters parameters = getECParameters(p); |
| |
| try { |
| parameters.init(spec); |
| return parameters.getParameterSpec(ECParameterSpec.class); |
| } catch (InvalidParameterSpecException ipse) { |
| return null; |
| } |
| } |
| |
| public static ECParameterSpec getECParameterSpec(Provider p, |
| byte[] params) |
| throws IOException { |
| AlgorithmParameters parameters = getECParameters(p); |
| |
| parameters.init(params); |
| |
| try { |
| return parameters.getParameterSpec(ECParameterSpec.class); |
| } catch (InvalidParameterSpecException ipse) { |
| return null; |
| } |
| } |
| |
| public static ECParameterSpec getECParameterSpec(Provider p, String name) { |
| AlgorithmParameters parameters = getECParameters(p); |
| |
| try { |
| parameters.init(new ECGenParameterSpec(name)); |
| return parameters.getParameterSpec(ECParameterSpec.class); |
| } catch (InvalidParameterSpecException ipse) { |
| return null; |
| } |
| } |
| |
| public static ECParameterSpec getECParameterSpec(Provider p, int keySize) { |
| AlgorithmParameters parameters = getECParameters(p); |
| |
| try { |
| parameters.init(new ECKeySizeParameterSpec(keySize)); |
| return parameters.getParameterSpec(ECParameterSpec.class); |
| } catch (InvalidParameterSpecException ipse) { |
| return null; |
| } |
| |
| } |
| |
| public static String getCurveName(Provider p, ECParameterSpec spec) { |
| ECGenParameterSpec nameSpec; |
| AlgorithmParameters parameters = getECParameters(p); |
| |
| try { |
| parameters.init(spec); |
| nameSpec = parameters.getParameterSpec(ECGenParameterSpec.class); |
| } catch (InvalidParameterSpecException ipse) { |
| return null; |
| } |
| |
| if (nameSpec == null) { |
| return null; |
| } |
| |
| return nameSpec.getName(); |
| } |
| |
| private ECUtil() {} |
| } |