BirdsiteLive/src/BirdsiteLive.Domain/CryptoService.cs

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using System;
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using System.Security.Cryptography;
using System.Text;
using BirdsiteLive.Domain.Factories;
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namespace BirdsiteLive.Domain
{
public interface ICryptoService
{
string GetUserPem(string id);
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string SignAndGetSignatureHeader(DateTime date, string actor, string host, string digest, string inbox);
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string ComputeSha256Hash(string data);
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}
public class CryptoService : ICryptoService
{
private readonly IMagicKeyFactory _magicKeyFactory;
#region Ctor
public CryptoService(IMagicKeyFactory magicKeyFactory)
{
_magicKeyFactory = magicKeyFactory;
}
#endregion
public string GetUserPem(string id)
{
return _magicKeyFactory.GetMagicKey().AsPEM;
}
/// <summary>
///
/// </summary>
/// <param name="data"></param>
/// <param name="actor">in the form of https://domain.io/actor</param>
/// <param name="host">in the form of domain.io</param>
/// <returns></returns>
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public string SignAndGetSignatureHeader(DateTime date, string actor, string targethost, string digest, string inbox)
{
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var usedInbox = "/inbox";
if (!string.IsNullOrWhiteSpace(inbox))
usedInbox = inbox;
var httpDate = date.ToString("r");
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var signedString = $"(request-target): post {usedInbox}\nhost: {targethost}\ndate: {httpDate}\ndigest: SHA-256={digest}";
var signedStringBytes = Encoding.UTF8.GetBytes(signedString);
var signature = _magicKeyFactory.GetMagicKey().Sign(signedStringBytes);
var sig64 = Convert.ToBase64String(signature);
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var header = "keyId=\"" + actor + "\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest\",signature=\"" + sig64 + "\"";
return header;
}
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public string ComputeSha256Hash(string data)
{
// Create a SHA256
using (SHA256 sha256Hash = SHA256.Create())
{
// ComputeHash - returns byte array
byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(data));
return Convert.ToBase64String(bytes);
}
}
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}
}