| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.conscrypt; |
| |
| import java.nio.ByteBuffer; |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.InvalidKeyException; |
| import java.security.Key; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.spec.AlgorithmParameterSpec; |
| import javax.crypto.MacSpi; |
| import javax.crypto.SecretKey; |
| |
| /** |
| * An implementation of {@link javax.crypto.Mac} which uses BoringSSL to perform all the operations. |
| */ |
| @Internal |
| public abstract class OpenSSLMac extends MacSpi { |
| private NativeRef.HMAC_CTX ctx; |
| |
| /** |
| * Holds the EVP_MD for the hashing algorithm, e.g. |
| * EVP_get_digestbyname("sha1"); |
| */ |
| private final long evp_md; |
| |
| /** |
| * The secret key used in this keyed MAC. |
| */ |
| private byte[] keyBytes; |
| |
| /** |
| * Holds the output size of the message digest. |
| */ |
| private final int size; |
| |
| /** |
| * Holds a dummy buffer for writing single bytes to the digest. |
| */ |
| private final byte[] singleByte = new byte[1]; |
| |
| private OpenSSLMac(long evp_md, int size) { |
| this.evp_md = evp_md; |
| this.size = size; |
| } |
| |
| @Override |
| protected int engineGetMacLength() { |
| return size; |
| } |
| |
| @Override |
| protected void engineInit(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, |
| InvalidAlgorithmParameterException { |
| if (!(key instanceof SecretKey)) { |
| throw new InvalidKeyException("key must be a SecretKey"); |
| } |
| |
| if (params != null) { |
| throw new InvalidAlgorithmParameterException("unknown parameter type"); |
| } |
| |
| keyBytes = key.getEncoded(); |
| if (keyBytes == null) { |
| throw new InvalidKeyException("key cannot be encoded"); |
| } |
| |
| resetContext(); |
| } |
| |
| private final void resetContext() { |
| NativeRef.HMAC_CTX ctxLocal = new NativeRef.HMAC_CTX(NativeCrypto.HMAC_CTX_new()); |
| if (keyBytes != null) { |
| NativeCrypto.HMAC_Init_ex(ctxLocal, keyBytes, evp_md); |
| } |
| |
| this.ctx = ctxLocal; |
| } |
| |
| @Override |
| protected void engineUpdate(byte input) { |
| singleByte[0] = input; |
| engineUpdate(singleByte, 0, 1); |
| } |
| |
| @Override |
| protected void engineUpdate(byte[] input, int offset, int len) { |
| final NativeRef.HMAC_CTX ctxLocal = ctx; |
| NativeCrypto.HMAC_Update(ctxLocal, input, offset, len); |
| } |
| |
| @Override |
| protected void engineUpdate(ByteBuffer input) { |
| // Optimization: Avoid copying/allocation for direct buffers because their contents are |
| // stored as a contiguous region in memory and thus can be efficiently accessed from native |
| // code. |
| |
| if (!input.hasRemaining()) { |
| return; |
| } |
| |
| if (!input.isDirect()) { |
| super.engineUpdate(input); |
| return; |
| } |
| |
| long baseAddress = NativeCrypto.getDirectBufferAddress(input); |
| if (baseAddress == 0) { |
| // Direct buffer's contents can't be accessed from JNI -- superclass's implementation |
| // is good enough to handle this. |
| super.engineUpdate(input); |
| return; |
| } |
| |
| // MAC the contents between Buffer's position and limit (remaining() number of bytes) |
| int position = input.position(); |
| if (position < 0) { |
| throw new RuntimeException("Negative position"); |
| } |
| long ptr = baseAddress + position; |
| int len = input.remaining(); |
| if (len < 0) { |
| throw new RuntimeException("Negative remaining amount"); |
| } |
| |
| final NativeRef.HMAC_CTX ctxLocal = ctx; |
| NativeCrypto.HMAC_UpdateDirect(ctxLocal, ptr, len); |
| input.position(position + len); |
| } |
| |
| @Override |
| protected byte[] engineDoFinal() { |
| final NativeRef.HMAC_CTX ctxLocal = ctx; |
| final byte[] output = NativeCrypto.HMAC_Final(ctxLocal); |
| resetContext(); |
| return output; |
| } |
| |
| @Override |
| protected void engineReset() { |
| resetContext(); |
| } |
| |
| public static final class HmacMD5 extends OpenSSLMac { |
| public HmacMD5() { |
| super(EvpMdRef.MD5.EVP_MD, EvpMdRef.MD5.SIZE_BYTES); |
| } |
| } |
| |
| public static final class HmacSHA1 extends OpenSSLMac { |
| public HmacSHA1() { |
| super(EvpMdRef.SHA1.EVP_MD, EvpMdRef.SHA1.SIZE_BYTES); |
| } |
| } |
| |
| public static final class HmacSHA224 extends OpenSSLMac { |
| public HmacSHA224() throws NoSuchAlgorithmException { |
| super(EvpMdRef.SHA224.EVP_MD, EvpMdRef.SHA224.SIZE_BYTES); |
| } |
| } |
| |
| public static final class HmacSHA256 extends OpenSSLMac { |
| public HmacSHA256() throws NoSuchAlgorithmException { |
| super(EvpMdRef.SHA256.EVP_MD, EvpMdRef.SHA256.SIZE_BYTES); |
| } |
| } |
| |
| public static final class HmacSHA384 extends OpenSSLMac { |
| public HmacSHA384() throws NoSuchAlgorithmException { |
| super(EvpMdRef.SHA384.EVP_MD, EvpMdRef.SHA384.SIZE_BYTES); |
| } |
| } |
| |
| public static final class HmacSHA512 extends OpenSSLMac { |
| public HmacSHA512() { |
| super(EvpMdRef.SHA512.EVP_MD, EvpMdRef.SHA512.SIZE_BYTES); |
| } |
| } |
| } |