org.apache.hadoop.hive.ql.udf.UDFSha1 Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.hive.ql.udf;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.codec.binary.Hex;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;
/**
* UDFSha.
*
*/
@Description(name = "sha1,sha",
value = "_FUNC_(str or bin) - Calculates the SHA-1 digest for string or binary "
+ "and returns the value as a hex string.",
extended = "Example:\n"
+ " > SELECT _FUNC_('ABC');\n"
+ " '3c01bdbb26f358bab27f267924aa2c9a03fcfdb8'\n"
+ " > SELECT _FUNC_(binary('ABC'));\n"
+ " '3c01bdbb26f358bab27f267924aa2c9a03fcfdb8'")
public class UDFSha1 extends UDF {
private final Text result = new Text();
private final MessageDigest digest;
public UDFSha1() {
try {
digest = MessageDigest.getInstance("SHA");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
/**
* Convert String to SHA-1
*/
public Text evaluate(Text n) {
if (n == null) {
return null;
}
digest.reset();
digest.update(n.getBytes(), 0, n.getLength());
byte[] shaBytes = digest.digest();
String shaHex = Hex.encodeHexString(shaBytes);
result.set(shaHex);
return result;
}
/**
* Convert bytes to SHA-1
*/
public Text evaluate(BytesWritable b) {
if (b == null) {
return null;
}
digest.reset();
digest.update(b.getBytes(), 0, b.getLength());
byte[] shaBytes = digest.digest();
String shaHex = Hex.encodeHexString(shaBytes);
result.set(shaHex);
return result;
}
}