author | redestad |
Thu, 21 Apr 2016 13:39:53 +0200 | |
changeset 37593 | 824750ada3d6 |
parent 32649 | 2ee9017c7597 |
child 37781 | 71ed5645f17c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.security.rsa; |
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import java.math.BigInteger; |
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import java.security.*; |
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import java.security.interfaces.*; |
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import java.security.spec.*; |
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import sun.security.action.GetPropertyAction; |
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/** |
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* KeyFactory for RSA keys. Keys must be instances of PublicKey or PrivateKey |
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* and getAlgorithm() must return "RSA". For such keys, it supports conversion |
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* between the following: |
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* |
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* For public keys: |
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* . PublicKey with an X.509 encoding |
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* . RSAPublicKey |
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* . RSAPublicKeySpec |
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* . X509EncodedKeySpec |
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* |
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* For private keys: |
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* . PrivateKey with a PKCS#8 encoding |
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* . RSAPrivateKey |
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* . RSAPrivateCrtKey |
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* . RSAPrivateKeySpec |
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* . RSAPrivateCrtKeySpec |
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* . PKCS8EncodedKeySpec |
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* (of course, CRT variants only for CRT keys) |
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* |
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* Note: as always, RSA keys should be at least 512 bits long |
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* |
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* @since 1.5 |
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* @author Andreas Sterbenz |
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*/ |
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public final class RSAKeyFactory extends KeyFactorySpi { |
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private static final Class<?> rsaPublicKeySpecClass = |
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RSAPublicKeySpec.class; |
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private static final Class<?> rsaPrivateKeySpecClass = |
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RSAPrivateKeySpec.class; |
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private static final Class<?> rsaPrivateCrtKeySpecClass = |
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RSAPrivateCrtKeySpec.class; |
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private static final Class<?> x509KeySpecClass = X509EncodedKeySpec.class; |
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private static final Class<?> pkcs8KeySpecClass = PKCS8EncodedKeySpec.class; |
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public static final int MIN_MODLEN = 512; |
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public static final int MAX_MODLEN = 16384; |
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/* |
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* If the modulus length is above this value, restrict the size of |
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* the exponent to something that can be reasonably computed. We |
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* could simply hardcode the exp len to something like 64 bits, but |
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* this approach allows flexibility in case impls would like to use |
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* larger module and exponent values. |
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*/ |
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public static final int MAX_MODLEN_RESTRICT_EXP = 3072; |
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public static final int MAX_RESTRICTED_EXPLEN = 64; |
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private static final boolean restrictExpLen = |
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"true".equalsIgnoreCase(GetPropertyAction.getProperty( |
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"sun.security.rsa.restrictRSAExponent", "true")); |
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// instance used for static translateKey(); |
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private static final RSAKeyFactory INSTANCE = new RSAKeyFactory(); |
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public RSAKeyFactory() { |
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// empty |
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} |
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/** |
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* Static method to convert Key into an instance of RSAPublicKeyImpl |
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* or RSAPrivate(Crt)KeyImpl. If the key is not an RSA key or cannot be |
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* used, throw an InvalidKeyException. |
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* |
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* Used by RSASignature and RSACipher. |
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*/ |
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public static RSAKey toRSAKey(Key key) throws InvalidKeyException { |
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if ((key instanceof RSAPrivateKeyImpl) || |
106 |
(key instanceof RSAPrivateCrtKeyImpl) || |
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(key instanceof RSAPublicKeyImpl)) { |
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return (RSAKey)key; |
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} else { |
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return (RSAKey)INSTANCE.engineTranslateKey(key); |
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} |
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} |
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/* |
115 |
* Single test entry point for all of the mechanisms in the SunRsaSign |
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* provider (RSA*KeyImpls). All of the tests are the same. |
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* |
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* For compatibility, we round up to the nearest byte here: |
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* some Key impls might pass in a value within a byte of the |
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* real value. |
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*/ |
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static void checkRSAProviderKeyLengths(int modulusLen, BigInteger exponent) |
123 |
throws InvalidKeyException { |
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checkKeyLengths(((modulusLen + 7) & ~7), exponent, |
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RSAKeyFactory.MIN_MODLEN, Integer.MAX_VALUE); |
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} |
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128 |
/** |
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* Check the length of an RSA key modulus/exponent to make sure it |
130 |
* is not too short or long. Some impls have their own min and |
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* max key sizes that may or may not match with a system defined value. |
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* |
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* @param modulusLen the bit length of the RSA modulus. |
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* @param exponent the RSA exponent |
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* @param minModulusLen if {@literal > 0}, check to see if modulusLen is at |
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* least this long, otherwise unused. |
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* @param maxModulusLen caller will allow this max number of bits. |
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* Allow the smaller of the system-defined maximum and this param. |
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* |
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* @throws InvalidKeyException if any of the values are unacceptable. |
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*/ |
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public static void checkKeyLengths(int modulusLen, BigInteger exponent, |
143 |
int minModulusLen, int maxModulusLen) throws InvalidKeyException { |
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||
145 |
if ((minModulusLen > 0) && (modulusLen < (minModulusLen))) { |
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throw new InvalidKeyException( "RSA keys must be at least " + |
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minModulusLen + " bits long"); |
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} |
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149 |
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150 |
// Even though our policy file may allow this, we don't want |
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// either value (mod/exp) to be too big. |
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153 |
int maxLen = Math.min(maxModulusLen, MAX_MODLEN); |
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155 |
// If a RSAPrivateKey/RSAPublicKey, make sure the |
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// modulus len isn't too big. |
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157 |
if (modulusLen > maxLen) { |
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throw new InvalidKeyException( |
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"RSA keys must be no longer than " + maxLen + " bits"); |
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} |
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162 |
// If a RSAPublicKey, make sure the exponent isn't too big. |
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if (restrictExpLen && (exponent != null) && |
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(modulusLen > MAX_MODLEN_RESTRICT_EXP) && |
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(exponent.bitLength() > MAX_RESTRICTED_EXPLEN)) { |
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throw new InvalidKeyException( |
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"RSA exponents can be no longer than " + |
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MAX_RESTRICTED_EXPLEN + " bits " + |
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" if modulus is greater than " + |
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MAX_MODLEN_RESTRICT_EXP + " bits"); |
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} |
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} |
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174 |
/** |
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175 |
* Translate an RSA key into a SunRsaSign RSA key. If conversion is |
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* not possible, throw an InvalidKeyException. |
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* See also JCA doc. |
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*/ |
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179 |
protected Key engineTranslateKey(Key key) throws InvalidKeyException { |
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180 |
if (key == null) { |
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throw new InvalidKeyException("Key must not be null"); |
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} |
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String keyAlg = key.getAlgorithm(); |
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184 |
if (keyAlg.equals("RSA") == false) { |
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throw new InvalidKeyException("Not an RSA key: " + keyAlg); |
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} |
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if (key instanceof PublicKey) { |
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return translatePublicKey((PublicKey)key); |
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189 |
} else if (key instanceof PrivateKey) { |
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190 |
return translatePrivateKey((PrivateKey)key); |
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191 |
} else { |
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throw new InvalidKeyException("Neither a public nor a private key"); |
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193 |
} |
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} |
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196 |
// see JCA doc |
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197 |
protected PublicKey engineGeneratePublic(KeySpec keySpec) |
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198 |
throws InvalidKeySpecException { |
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199 |
try { |
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200 |
return generatePublic(keySpec); |
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201 |
} catch (InvalidKeySpecException e) { |
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throw e; |
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203 |
} catch (GeneralSecurityException e) { |
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throw new InvalidKeySpecException(e); |
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205 |
} |
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206 |
} |
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||
208 |
// see JCA doc |
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209 |
protected PrivateKey engineGeneratePrivate(KeySpec keySpec) |
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210 |
throws InvalidKeySpecException { |
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211 |
try { |
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212 |
return generatePrivate(keySpec); |
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213 |
} catch (InvalidKeySpecException e) { |
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throw e; |
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215 |
} catch (GeneralSecurityException e) { |
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216 |
throw new InvalidKeySpecException(e); |
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217 |
} |
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218 |
} |
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||
220 |
// internal implementation of translateKey() for public keys. See JCA doc |
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221 |
private PublicKey translatePublicKey(PublicKey key) |
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222 |
throws InvalidKeyException { |
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223 |
if (key instanceof RSAPublicKey) { |
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224 |
if (key instanceof RSAPublicKeyImpl) { |
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225 |
return key; |
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226 |
} |
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227 |
RSAPublicKey rsaKey = (RSAPublicKey)key; |
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228 |
try { |
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229 |
return new RSAPublicKeyImpl( |
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230 |
rsaKey.getModulus(), |
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rsaKey.getPublicExponent() |
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232 |
); |
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} catch (RuntimeException e) { |
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234 |
// catch providers that incorrectly implement RSAPublicKey |
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throw new InvalidKeyException("Invalid key", e); |
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236 |
} |
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237 |
} else if ("X.509".equals(key.getFormat())) { |
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238 |
byte[] encoded = key.getEncoded(); |
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239 |
return new RSAPublicKeyImpl(encoded); |
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240 |
} else { |
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throw new InvalidKeyException("Public keys must be instance " |
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242 |
+ "of RSAPublicKey or have X.509 encoding"); |
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243 |
} |
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244 |
} |
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246 |
// internal implementation of translateKey() for private keys. See JCA doc |
|
247 |
private PrivateKey translatePrivateKey(PrivateKey key) |
|
248 |
throws InvalidKeyException { |
|
249 |
if (key instanceof RSAPrivateCrtKey) { |
|
250 |
if (key instanceof RSAPrivateCrtKeyImpl) { |
|
251 |
return key; |
|
252 |
} |
|
253 |
RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey)key; |
|
254 |
try { |
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255 |
return new RSAPrivateCrtKeyImpl( |
|
256 |
rsaKey.getModulus(), |
|
257 |
rsaKey.getPublicExponent(), |
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258 |
rsaKey.getPrivateExponent(), |
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259 |
rsaKey.getPrimeP(), |
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260 |
rsaKey.getPrimeQ(), |
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261 |
rsaKey.getPrimeExponentP(), |
|
262 |
rsaKey.getPrimeExponentQ(), |
|
263 |
rsaKey.getCrtCoefficient() |
|
264 |
); |
|
265 |
} catch (RuntimeException e) { |
|
266 |
// catch providers that incorrectly implement RSAPrivateCrtKey |
|
267 |
throw new InvalidKeyException("Invalid key", e); |
|
268 |
} |
|
269 |
} else if (key instanceof RSAPrivateKey) { |
|
270 |
if (key instanceof RSAPrivateKeyImpl) { |
|
271 |
return key; |
|
272 |
} |
|
273 |
RSAPrivateKey rsaKey = (RSAPrivateKey)key; |
|
274 |
try { |
|
275 |
return new RSAPrivateKeyImpl( |
|
276 |
rsaKey.getModulus(), |
|
277 |
rsaKey.getPrivateExponent() |
|
278 |
); |
|
279 |
} catch (RuntimeException e) { |
|
280 |
// catch providers that incorrectly implement RSAPrivateKey |
|
281 |
throw new InvalidKeyException("Invalid key", e); |
|
282 |
} |
|
283 |
} else if ("PKCS#8".equals(key.getFormat())) { |
|
284 |
byte[] encoded = key.getEncoded(); |
|
285 |
return RSAPrivateCrtKeyImpl.newKey(encoded); |
|
286 |
} else { |
|
287 |
throw new InvalidKeyException("Private keys must be instance " |
|
288 |
+ "of RSAPrivate(Crt)Key or have PKCS#8 encoding"); |
|
289 |
} |
|
290 |
} |
|
291 |
||
292 |
// internal implementation of generatePublic. See JCA doc |
|
293 |
private PublicKey generatePublic(KeySpec keySpec) |
|
294 |
throws GeneralSecurityException { |
|
295 |
if (keySpec instanceof X509EncodedKeySpec) { |
|
296 |
X509EncodedKeySpec x509Spec = (X509EncodedKeySpec)keySpec; |
|
297 |
return new RSAPublicKeyImpl(x509Spec.getEncoded()); |
|
298 |
} else if (keySpec instanceof RSAPublicKeySpec) { |
|
299 |
RSAPublicKeySpec rsaSpec = (RSAPublicKeySpec)keySpec; |
|
300 |
return new RSAPublicKeyImpl( |
|
301 |
rsaSpec.getModulus(), |
|
302 |
rsaSpec.getPublicExponent() |
|
303 |
); |
|
304 |
} else { |
|
305 |
throw new InvalidKeySpecException("Only RSAPublicKeySpec " |
|
306 |
+ "and X509EncodedKeySpec supported for RSA public keys"); |
|
307 |
} |
|
308 |
} |
|
309 |
||
310 |
// internal implementation of generatePrivate. See JCA doc |
|
311 |
private PrivateKey generatePrivate(KeySpec keySpec) |
|
312 |
throws GeneralSecurityException { |
|
313 |
if (keySpec instanceof PKCS8EncodedKeySpec) { |
|
314 |
PKCS8EncodedKeySpec pkcsSpec = (PKCS8EncodedKeySpec)keySpec; |
|
315 |
return RSAPrivateCrtKeyImpl.newKey(pkcsSpec.getEncoded()); |
|
316 |
} else if (keySpec instanceof RSAPrivateCrtKeySpec) { |
|
317 |
RSAPrivateCrtKeySpec rsaSpec = (RSAPrivateCrtKeySpec)keySpec; |
|
318 |
return new RSAPrivateCrtKeyImpl( |
|
319 |
rsaSpec.getModulus(), |
|
320 |
rsaSpec.getPublicExponent(), |
|
321 |
rsaSpec.getPrivateExponent(), |
|
322 |
rsaSpec.getPrimeP(), |
|
323 |
rsaSpec.getPrimeQ(), |
|
324 |
rsaSpec.getPrimeExponentP(), |
|
325 |
rsaSpec.getPrimeExponentQ(), |
|
326 |
rsaSpec.getCrtCoefficient() |
|
327 |
); |
|
328 |
} else if (keySpec instanceof RSAPrivateKeySpec) { |
|
329 |
RSAPrivateKeySpec rsaSpec = (RSAPrivateKeySpec)keySpec; |
|
330 |
return new RSAPrivateKeyImpl( |
|
331 |
rsaSpec.getModulus(), |
|
332 |
rsaSpec.getPrivateExponent() |
|
333 |
); |
|
334 |
} else { |
|
335 |
throw new InvalidKeySpecException("Only RSAPrivate(Crt)KeySpec " |
|
336 |
+ "and PKCS8EncodedKeySpec supported for RSA private keys"); |
|
337 |
} |
|
338 |
} |
|
339 |
||
340 |
protected <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpec) |
|
341 |
throws InvalidKeySpecException { |
|
342 |
try { |
|
343 |
// convert key to one of our keys |
|
344 |
// this also verifies that the key is a valid RSA key and ensures |
|
345 |
// that the encoding is X.509/PKCS#8 for public/private keys |
|
346 |
key = engineTranslateKey(key); |
|
347 |
} catch (InvalidKeyException e) { |
|
348 |
throw new InvalidKeySpecException(e); |
|
349 |
} |
|
350 |
if (key instanceof RSAPublicKey) { |
|
351 |
RSAPublicKey rsaKey = (RSAPublicKey)key; |
|
352 |
if (rsaPublicKeySpecClass.isAssignableFrom(keySpec)) { |
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return keySpec.cast(new RSAPublicKeySpec( |
2 | 354 |
rsaKey.getModulus(), |
355 |
rsaKey.getPublicExponent() |
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356 |
)); |
2 | 357 |
} else if (x509KeySpecClass.isAssignableFrom(keySpec)) { |
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return keySpec.cast(new X509EncodedKeySpec(key.getEncoded())); |
2 | 359 |
} else { |
360 |
throw new InvalidKeySpecException |
|
361 |
("KeySpec must be RSAPublicKeySpec or " |
|
362 |
+ "X509EncodedKeySpec for RSA public keys"); |
|
363 |
} |
|
364 |
} else if (key instanceof RSAPrivateKey) { |
|
365 |
if (pkcs8KeySpecClass.isAssignableFrom(keySpec)) { |
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366 |
return keySpec.cast(new PKCS8EncodedKeySpec(key.getEncoded())); |
2 | 367 |
} else if (rsaPrivateCrtKeySpecClass.isAssignableFrom(keySpec)) { |
368 |
if (key instanceof RSAPrivateCrtKey) { |
|
369 |
RSAPrivateCrtKey crtKey = (RSAPrivateCrtKey)key; |
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370 |
return keySpec.cast(new RSAPrivateCrtKeySpec( |
2 | 371 |
crtKey.getModulus(), |
372 |
crtKey.getPublicExponent(), |
|
373 |
crtKey.getPrivateExponent(), |
|
374 |
crtKey.getPrimeP(), |
|
375 |
crtKey.getPrimeQ(), |
|
376 |
crtKey.getPrimeExponentP(), |
|
377 |
crtKey.getPrimeExponentQ(), |
|
378 |
crtKey.getCrtCoefficient() |
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379 |
)); |
2 | 380 |
} else { |
381 |
throw new InvalidKeySpecException |
|
382 |
("RSAPrivateCrtKeySpec can only be used with CRT keys"); |
|
383 |
} |
|
384 |
} else if (rsaPrivateKeySpecClass.isAssignableFrom(keySpec)) { |
|
385 |
RSAPrivateKey rsaKey = (RSAPrivateKey)key; |
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386 |
return keySpec.cast(new RSAPrivateKeySpec( |
2 | 387 |
rsaKey.getModulus(), |
388 |
rsaKey.getPrivateExponent() |
|
10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
389 |
)); |
2 | 390 |
} else { |
391 |
throw new InvalidKeySpecException |
|
392 |
("KeySpec must be RSAPrivate(Crt)KeySpec or " |
|
393 |
+ "PKCS8EncodedKeySpec for RSA private keys"); |
|
394 |
} |
|
395 |
} else { |
|
396 |
// should not occur, caught in engineTranslateKey() |
|
397 |
throw new InvalidKeySpecException("Neither public nor private key"); |
|
398 |
} |
|
399 |
} |
|
400 |
} |