src/main/java/com/aliyun/oss/common/auth/HmacSHA1Signature.java [39:71]:
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    private static final String VERSION = "1";

    private static final Object LOCK = new Object();

    /* Prototype of the Mac instance. */
    private static Mac macInstance;

    public String getAlgorithm() {
        return ALGORITHM;
    }

    public String getVersion() {
        return VERSION;
    }

    public String computeSignature(String key, String data) {
        try {
            byte[] signData = sign(key.getBytes(DEFAULT_ENCODING), data.getBytes(DEFAULT_ENCODING), macInstance,
                                LOCK, ALGORITHM);
            return BinaryUtil.toBase64String(signData);
        } catch (UnsupportedEncodingException ex) {
            throw new RuntimeException("Unsupported algorithm: " + DEFAULT_ENCODING, ex);
        }
    }

    public byte[] computeHash(byte[] key, byte[] data) {
        return sign(key, data, macInstance, LOCK, ALGORITHM);
    }

    static {
        try {
            macInstance = Mac.getInstance(ALGORITHM);
        } catch (Throwable e) {
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src/main/java/com/aliyun/oss/common/auth/HmacSHA256Signature.java [39:71]:
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    private static final String VERSION = "1";

    private static final Object LOCK = new Object();

    /* Prototype of the Mac instance. */
    private static Mac macInstance;

    public String getAlgorithm() {
        return ALGORITHM;
    }

    public String getVersion() {
        return VERSION;
    }

    public String computeSignature(String key, String data) {
        try {
            byte[] signData = sign(key.getBytes(DEFAULT_ENCODING), data.getBytes(DEFAULT_ENCODING), macInstance,
                                LOCK, ALGORITHM);
            return BinaryUtil.toBase64String(signData);
        } catch (UnsupportedEncodingException ex) {
            throw new RuntimeException("Unsupported algorithm: " + DEFAULT_ENCODING, ex);
        }
    }

    public byte[] computeHash(byte[] key, byte[] data) {
        return sign(key, data, macInstance, LOCK, ALGORITHM);
    }

    static {
        try {
            macInstance = Mac.getInstance(ALGORITHM);
        } catch (Throwable e) {
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