com.aliyun.auth.signature.signer.SignAlgorithmHmacSHA256 Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of aliyun-java-auth Show documentation

The newest version!

package com.aliyun.auth.signature.signer;

import com.aliyun.auth.signature.exception.SignatureException;

import javax.crypto.Mac;
import java.security.NoSuchAlgorithmException;

public enum SignAlgorithmHmacSHA256 {
    HmacSHA256("HmacSHA256");

    private final ThreadLocal reference;
    private final String algorithmName;

    SignAlgorithmHmacSHA256(String algorithmName) {
        this.algorithmName = algorithmName;
        reference = new MacThreadLocal(algorithmName);
    }

    public String getAlgorithmName() {
        return this.algorithmName;
    }

    public Mac getMac() {
        return reference.get();
    }

    private static class MacThreadLocal extends ThreadLocal {
        private final String algorithmName;

        MacThreadLocal(String algorithmName) {
            this.algorithmName = algorithmName;
        }

        @Override
        protected Mac initialValue() {
            try {
                return Mac.getInstance(algorithmName);
            } catch (NoSuchAlgorithmException e) {
                throw new SignatureException("Unable to fetch Mac instance for Algorithm "
                        + algorithmName + e.getMessage());

            }
        }
    }
}