javascript中的Amazon S3授权头（java到javascript）

我正在尝试用javascript重建AmazonS3授权头。目前我拥有的是这个

const encoder = new TextEncoder('utf-8');
stringToSign = encoder.encode(stringToSign);
let decode = Buffer.from(secretKey, 'base64');
decode = encoder.encode(decode);
var hmac = crypto.createHmac('sha1', decode).update(new Buffer(base64Policy, 'utf-8')).digest('base64');

stringToSign

POST 
594bc6507c5ea009b944afcbed445d8c 
application/x-www-form-urlencoded; charset=utf-8 
Sun, 25 Apr 2021 20:48:06 GMT 

N2Y3Y2MwYjY4MjM4NGJlNzg2Y2I2NmUxMWE4NjRjMzY=

secretKey

POST 
594bc6507c5ea009b944afcbed445d8c 
application/x-www-form-urlencoded; charset=utf-8 
Sun, 25 Apr 2021 20:48:06 GMT 

N2Y3Y2MwYjY4MjM4NGJlNzg2Y2I2NmUxMWE4NjRjMzY=

不用担心这些密钥的保密性，它们在我的本地环境中

HMAC的结果是

3EAV8OAJ14NR22W6Z3RTBSMTD4=

根据长度判断其正确，但由于某种原因其格式不正确

我有我们的旧java应用程序的源代码，类似这样

String str7 = method + "\n" + md5Hash + "\n" + "application/x-www-form-urlencoded; charset=utf-8" + "\n" + date + "\n" + "\n" + urlSegment;
Mac instance = Mac.getInstance("HmacSHA1");
byte[] decode = Base64.decode(str4, 0);
instance.init(new SecretKeySpec(decode, instance.getAlgorithm()));
Charset charset = Charsets.UTF_8;
if (str7 != null) {
    byte[] bytes = str7.getBytes(charset);
    byte[] encode = Base64.encode(instance.doFinal(bytes), 0);
    String str8 = "PWS " + keyId + ':' + new String(encode, Charsets.UTF_8);

    if (str8 != null) {
        return StringsKt.trim((CharSequence) str8).toString();
    }
}

有人能告诉我我做错了什么吗？我也咨询过

但我觉得有点不同