| // Copyright (C) 2015 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 com.googlesource.gerrit.plugins.cfoauth; |
| |
| import static java.nio.charset.StandardCharsets.US_ASCII; |
| import static org.apache.commons.codec.binary.Base64.encodeBase64URLSafe; |
| |
| import java.security.InvalidKeyException; |
| import java.security.NoSuchAlgorithmException; |
| import java.text.MessageFormat; |
| |
| import javax.crypto.Mac; |
| import javax.crypto.SecretKey; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| class HMACSHA256SignatureVerifier implements SignatureVerifier { |
| |
| private static final String HS256 = "HS256"; |
| private static final String HMAC_SHA256 = "HMACSHA256"; |
| |
| private final SecretKey secretKey; |
| |
| public HMACSHA256SignatureVerifier(String secret) { |
| secretKey = new SecretKeySpec(secret.getBytes(US_ASCII), HMAC_SHA256); |
| } |
| |
| @Override |
| public boolean verify(String content, String signature) { |
| Mac mac = null; |
| try { |
| mac = Mac.getInstance(HMAC_SHA256); |
| } catch (NoSuchAlgorithmException e) { |
| throw new IllegalStateException( |
| "Runtime does not support HMACSHA256 signatures", e); |
| } |
| try { |
| mac.init(secretKey); |
| } catch (InvalidKeyException e) { |
| throw new IllegalArgumentException(MessageFormat.format( |
| "Invalid HMACSHA256 secret: {0}", secretKey), e); |
| } |
| byte[] digest = mac.doFinal(content.getBytes(US_ASCII)); |
| String actualSignature = new String(encodeBase64URLSafe(digest), US_ASCII); |
| return signature.equals(actualSignature); |
| } |
| |
| @Override |
| public boolean supports(String algorithm) { |
| return HS256.equalsIgnoreCase(algorithm) |
| || HMAC_SHA256.equalsIgnoreCase(algorithm); |
| } |
| |
| } |