具有BouncyCastle-PCL的C#PCL HMACSHAX [英] C# PCL HMACSHAX with BouncyCastle-PCL

问题描述

我想在可移植C#类中实现此逻辑:

I want to implement this logic in portable C# class:

static JsonWebToken()
        {
            HashAlgorithms = new Dictionary<JwtHashAlgorithm, Func<byte[], byte[], byte[]>>
            {
                { JwtHashAlgorithm.HS256, (key, value) => { using (var sha = new HMACSHA256(key)) { return sha.ComputeHash(value); } } },
                { JwtHashAlgorithm.HS384, (key, value) => { using (var sha = new HMACSHA384(key)) { return sha.ComputeHash(value); } } },
                { JwtHashAlgorithm.HS512, (key, value) => { using (var sha = new HMACSHA512(key)) { return sha.ComputeHash(value); } } }
            };
        }

但HMACSHA256，HMACSHA384和HMACSHA512在便携式计算机中不存在 库.

but HMACSHA256, HMACSHA384 and HMACSHA512 does not exist in portable library.

首先，我尝试使用 https://github.com/AArnott/PCLCrypto 但我总是得到:An exception of type 'System.NotImplementedException' occurred in PCLCrypto.dll but was not handled in user code

First I try with https://github.com/AArnott/PCLCrypto but I always get: An exception of type 'System.NotImplementedException' occurred in PCLCrypto.dll but was not handled in user code

我检查了一下代码，然后发现Crpyto for PCL没有实现，并且总是抛出异常

I checked then code and I saw Crpyto for PCL is not implemented and always throw an exception

然后我找到了这个图书馆: https://github.com/onovotny/BouncyCastle-PCL

Then i found this library: https://github.com/onovotny/BouncyCastle-PCL

但是没有文档说明如何使用它.有人可以给我一个例子如何实现

But there is no documentation how to use it. Can someone give me an exmaple how to implement

var sha = new HMACSHA256(key)
var sha = new HMACSHA384(key)
var sha = new HMACSHA512(key)

与BouncyCastle-PCL.

with BouncyCastle-PCL.

推荐答案

尝试为HmacSha256

public class HmacSha256
    {
        private readonly HMac _hmac;

        public HmacSha256(byte[] key)
        {
            _hmac = new HMac(new Sha256Digest());
            _hmac.Init(new KeyParameter(key));
        }

        public byte[] ComputeHash(byte[] value)
        {
            if (value == null) throw new ArgumentNullException("value");

            byte[] resBuf = new byte[_hmac.GetMacSize()];
            _hmac.BlockUpdate(value, 0, value.Length);
            _hmac.DoFinal(resBuf, 0);

            return resBuf;
        }
    }

其他两个应该也一样...

The same should be for other two...

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