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Diffstat (limited to 'src/main/java/org/onap/crud/util/HashGenerator.java')
-rw-r--r-- | src/main/java/org/onap/crud/util/HashGenerator.java | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/main/java/org/onap/crud/util/HashGenerator.java b/src/main/java/org/onap/crud/util/HashGenerator.java new file mode 100644 index 0000000..02558fa --- /dev/null +++ b/src/main/java/org/onap/crud/util/HashGenerator.java @@ -0,0 +1,65 @@ +/** + * ============LICENSE_START======================================================= + * org.onap.aai + * ================================================================================ + * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved. + * Copyright © 2017-2018 Amdocs + * ================================================================================ + * 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. + * ============LICENSE_END========================================================= + */ +package org.onap.crud.util; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.ObjectOutput; +import java.io.ObjectOutputStream; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; +/** + * Generates a sha 256 hash + */ +public class HashGenerator { + + private MessageDigest messageDigest; + + public HashGenerator() throws NoSuchAlgorithmException { + this.messageDigest = MessageDigest.getInstance("SHA-256"); + } + + /** + * Generates a SHA 256 hash as a hexadecimal string for the inputs. + * Calls toString on the input objects to convert into a byte stream. + * @param values + * @return SHA 256 hash of the inputs as a hexadecimal string. + * @throws IOException + */ + public String generateSHA256AsHex(Object... values) throws IOException { + byte[] bytes = convertToBytes(values); + byte[] digest = messageDigest.digest(bytes); + StringBuilder result = new StringBuilder(); + for (byte byt : digest) result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(1)); + return result.toString(); + } + + private byte[] convertToBytes(Object... values) throws IOException { + try (ByteArrayOutputStream bos = new ByteArrayOutputStream(); + ObjectOutput out = new ObjectOutputStream(bos)) { + for (Object object : values) { + out.writeObject(object.toString()); + } + return bos.toByteArray(); + } + } + +}
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