com.aliyun.auth.signature.signer.SignAlgorithmSHA256withRSA Maven / Gradle / Ivy

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package com.aliyun.auth.signature.signer;

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

import java.security.NoSuchAlgorithmException;
import java.security.Signature;

public enum SignAlgorithmSHA256withRSA {
    SHA256withRSA("SHA256withRSA", "RSA");

    private final ThreadLocal reference;
    private final String algorithmName;
    private final String keyName;

    SignAlgorithmSHA256withRSA(String algorithmName, String keyName) {
        this.algorithmName = algorithmName;
        this.keyName = keyName;
        reference = new MacThreadLocal(algorithmName);
    }

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

    @Override
    public String toString(){
        return this.keyName;
    }

    public Signature getSignature() {
        return reference.get();
    }

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

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

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