author | weijun |
Wed, 01 Aug 2018 13:35:08 +0800 | |
changeset 51272 | 9d92ff04a29c |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 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.provider; |
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import javax.crypto.Mac; |
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import javax.crypto.spec.SecretKeySpec; |
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import java.security.InvalidKeyException; |
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import java.security.NoSuchAlgorithmException; |
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import java.security.NoSuchProviderException; |
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import java.security.SecureRandomParameters; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.List; |
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public class HmacDrbg extends AbstractHashDrbg { |
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private Mac mac; |
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private String macAlg; |
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private byte[] v; |
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private byte[] k; |
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public HmacDrbg(SecureRandomParameters params) { |
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mechName = "HMAC_DRBG"; |
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configure(params); |
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} |
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private void status() { |
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if (debug != null) { |
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debug.println(this, "V = " + hex(v)); |
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debug.println(this, "Key = " + hex(k)); |
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debug.println(this, "reseed counter = " + reseedCounter); |
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} |
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} |
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// 800-90Ar1 10.1.2.2: HMAC_DRBG Update Process |
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private void update(List<byte[]> inputs) { |
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try { |
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// Step 1. K = HMAC (K, V || 0x00 || provided_data). |
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mac.init(new SecretKeySpec(k, macAlg)); |
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mac.update(v); |
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mac.update((byte) 0); |
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for (byte[] input: inputs) { |
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mac.update(input); |
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} |
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k = mac.doFinal(); |
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// Step 2. V = HMAC (K, V). |
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mac.init(new SecretKeySpec(k, macAlg)); |
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v = mac.doFinal(v); |
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if (!inputs.isEmpty()) { |
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// Step 4. K = HMAC (K, V || 0x01 || provided_data). |
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mac.update(v); |
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mac.update((byte) 1); |
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for (byte[] input: inputs) { |
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mac.update(input); |
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} |
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k = mac.doFinal(); |
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// Step 5. V=HMAC(K,V). |
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mac.init(new SecretKeySpec(k, macAlg)); |
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v = mac.doFinal(v); |
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} // else Step 3 |
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// Step 6. Return |
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} catch (InvalidKeyException e) { |
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throw new InternalError(e); |
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} |
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} |
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/** |
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* This call, used by the constructors, instantiates the digest. |
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*/ |
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@Override |
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protected void initEngine() { |
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macAlg = "HmacSHA" + algorithm.substring(4); |
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try { |
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/* |
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* Use the local SunJCE implementation to avoid native |
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* performance overhead. |
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*/ |
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mac = Mac.getInstance(macAlg, "SunJCE"); |
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} catch (NoSuchProviderException | NoSuchAlgorithmException e) { |
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// Fallback to any available. |
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try { |
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mac = Mac.getInstance(macAlg); |
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} catch (NoSuchAlgorithmException exc) { |
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throw new InternalError( |
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"internal error: " + macAlg + " not available.", exc); |
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} |
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} |
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} |
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// This method is used by both instantiation and reseeding. |
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@Override |
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protected final synchronized void hashReseedInternal(List<byte[]> input) { |
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// 800-90Ar1 10.1.2.3: Instantiate Process. |
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// 800-90Ar1 10.1.2.4: Reseed Process. |
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if (v == null) { |
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k = new byte[outLen]; |
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v = new byte[outLen]; |
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Arrays.fill(v, (byte) 1); |
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} |
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// Step 2: HMAC_DRBG_Update |
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update(input); |
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// Step 3: reseed_counter = 1. |
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reseedCounter = 1; |
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//status(); |
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// Step 4: Return |
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} |
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/** |
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* Generates a user-specified number of random bytes. |
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* |
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* @param result the array to be filled in with random bytes. |
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*/ |
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@Override |
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public synchronized void generateAlgorithm( |
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byte[] result, byte[] additionalInput) { |
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if (debug != null) { |
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debug.println(this, "generateAlgorithm"); |
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} |
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// 800-90Ar1 10.1.2.5: HMAC_DRBG_Generate Process |
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// Step 1: Check reseed_counter. Will not fail. Already checked in |
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// AbstractDrbg#engineNextBytes. |
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// Step 2. HMAC_DRBG_Update |
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if (additionalInput != null) { |
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update(Collections.singletonList(additionalInput)); |
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} |
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// Step 3. temp = Null. |
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int pos = 0; |
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int len = result.length; |
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// Step 4. Loop |
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while (len > 0) { |
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// Step 4.1 V = HMAC (Key, V). |
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try { |
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mac.init(new SecretKeySpec(k, macAlg)); |
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} catch (InvalidKeyException e) { |
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throw new InternalError(e); |
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} |
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v = mac.doFinal(v); |
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// Step 4.2 temp = temp || V. |
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System.arraycopy(v, 0, result, pos, |
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len > outLen ? outLen : len); |
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len -= outLen; |
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if (len <= 0) { |
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// shortcut, so that pos needn't be updated |
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break; |
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} |
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pos += outLen; |
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} |
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// Step 5: No need to truncate |
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// Step 6. HMAC_DRBG_Update (additional_input, Key, V). |
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if (additionalInput != null) { |
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update(Collections.singletonList(additionalInput)); |
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} else { |
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update(Collections.emptyList()); |
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} |
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// Step 7. reseed_counter = reseed_counter + 1. |
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reseedCounter++; |
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//status(); |
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// Step 8. Return |
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} |
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} |