| /* |
| * Copyright (c) 2003, 2018, 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.rsa; |
| |
| import java.io.IOException; |
| import java.math.BigInteger; |
| |
| import java.security.*; |
| import java.security.spec.*; |
| import java.security.interfaces.*; |
| |
| import sun.security.util.*; |
| import sun.security.x509.X509Key; |
| import sun.security.x509.AlgorithmId; |
| |
| import static sun.security.rsa.RSAUtil.KeyType; |
| |
| /** |
| * RSA public key implementation for "RSA", "RSASSA-PSS" algorithms. |
| * |
| * Note: RSA keys must be at least 512 bits long |
| * |
| * @see RSAPrivateCrtKeyImpl |
| * @see RSAPrivateKeyImpl |
| * @see RSAKeyFactory |
| * |
| * @since 1.5 |
| * @author Andreas Sterbenz |
| */ |
| public final class RSAPublicKeyImpl extends X509Key implements RSAPublicKey { |
| |
| private static final long serialVersionUID = 2644735423591199609L; |
| private static final BigInteger THREE = BigInteger.valueOf(3); |
| |
| private BigInteger n; // modulus |
| private BigInteger e; // public exponent |
| |
| // optional parameters associated with this RSA key |
| // specified in the encoding of its AlgorithmId |
| // must be null for "RSA" keys. |
| private AlgorithmParameterSpec keyParams; |
| |
| /** |
| * Generate a new RSAPublicKey from the specified encoding. |
| * Used by SunPKCS11 provider. |
| */ |
| public static RSAPublicKey newKey(byte[] encoded) |
| throws InvalidKeyException { |
| return new RSAPublicKeyImpl(encoded); |
| } |
| |
| /** |
| * Generate a new RSAPublicKey from the specified type and components. |
| * Used by SunPKCS11 provider. |
| */ |
| public static RSAPublicKey newKey(KeyType type, |
| AlgorithmParameterSpec params, BigInteger n, BigInteger e) |
| throws InvalidKeyException { |
| AlgorithmId rsaId = RSAUtil.createAlgorithmId(type, params); |
| return new RSAPublicKeyImpl(rsaId, n, e); |
| } |
| |
| /** |
| * Construct a RSA key from AlgorithmId and its components. Used by |
| * RSAKeyFactory and RSAKeyPairGenerator. |
| */ |
| RSAPublicKeyImpl(AlgorithmId rsaId, BigInteger n, BigInteger e) |
| throws InvalidKeyException { |
| RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); |
| checkExponentRange(n, e); |
| |
| this.n = n; |
| this.e = e; |
| this.keyParams = RSAUtil.getParamSpec(rsaId); |
| |
| // generate the encoding |
| algid = rsaId; |
| try { |
| DerOutputStream out = new DerOutputStream(); |
| out.putInteger(n); |
| out.putInteger(e); |
| byte[] keyArray = |
| new DerValue(DerValue.tag_Sequence, |
| out.toByteArray()).toByteArray(); |
| setKey(new BitArray(keyArray.length*8, keyArray)); |
| } catch (IOException exc) { |
| // should never occur |
| throw new InvalidKeyException(exc); |
| } |
| } |
| |
| /** |
| * Construct a key from its encoding. Used by RSAKeyFactory. |
| */ |
| RSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException { |
| if (encoded == null || encoded.length == 0) { |
| throw new InvalidKeyException("Missing key encoding"); |
| } |
| decode(encoded); // this sets n and e value |
| RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); |
| checkExponentRange(n, e); |
| |
| try { |
| // this will check the validity of params |
| this.keyParams = RSAUtil.getParamSpec(algid); |
| } catch (ProviderException e) { |
| throw new InvalidKeyException(e); |
| } |
| } |
| |
| // pkg private utility method for checking RSA modulus and public exponent |
| static void checkExponentRange(BigInteger mod, BigInteger exp) |
| throws InvalidKeyException { |
| // the exponent should be smaller than the modulus |
| if (exp.compareTo(mod) >= 0) { |
| throw new InvalidKeyException("exponent is larger than modulus"); |
| } |
| |
| // the exponent should be at least 3 |
| if (exp.compareTo(THREE) < 0) { |
| throw new InvalidKeyException("exponent is smaller than 3"); |
| } |
| } |
| |
| // see JCA doc |
| @Override |
| public String getAlgorithm() { |
| return algid.getName(); |
| } |
| |
| // see JCA doc |
| @Override |
| public BigInteger getModulus() { |
| return n; |
| } |
| |
| // see JCA doc |
| @Override |
| public BigInteger getPublicExponent() { |
| return e; |
| } |
| |
| // see JCA doc |
| @Override |
| public AlgorithmParameterSpec getParams() { |
| return keyParams; |
| } |
| |
| /** |
| * Parse the key. Called by X509Key. |
| */ |
| protected void parseKeyBits() throws InvalidKeyException { |
| try { |
| DerInputStream in = new DerInputStream(getKey().toByteArray()); |
| DerValue derValue = in.getDerValue(); |
| if (derValue.tag != DerValue.tag_Sequence) { |
| throw new IOException("Not a SEQUENCE"); |
| } |
| DerInputStream data = derValue.data; |
| n = data.getPositiveBigInteger(); |
| e = data.getPositiveBigInteger(); |
| if (derValue.data.available() != 0) { |
| throw new IOException("Extra data available"); |
| } |
| } catch (IOException e) { |
| throw new InvalidKeyException("Invalid RSA public key", e); |
| } |
| } |
| |
| // return a string representation of this key for debugging |
| @Override |
| public String toString() { |
| return "Sun " + getAlgorithm() + " public key, " + n.bitLength() |
| + " bits" + "\n params: " + keyParams + "\n modulus: " + n |
| + "\n public exponent: " + e; |
| } |
| |
| protected Object writeReplace() throws java.io.ObjectStreamException { |
| return new KeyRep(KeyRep.Type.PUBLIC, |
| getAlgorithm(), |
| getFormat(), |
| getEncoded()); |
| } |
| } |