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move passwordhasher to helpers

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Вячеслав 2025-05-30 23:19:50 +05:00
parent 153f38d6b2
commit db012aed92
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62
SurveyBackend/SurveyBackend.Services/Services/Sha256PasswordHasher.cs
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using System.Security.Cryptography;
using SurveyBackend.Core.Services;
namespace SurveyBackend.Services.Services;
public class Sha256PasswordHasher : IPasswordHasher
{
private const int RehashCount = 10000;
private const int HashSizeBytes = 16;
private const int SaltSizeBytes = 16;
public string HashPassword(string password)
{
var saltBytes = RandomNumberGenerator.GetBytes(SaltSizeBytes);
using var deriveBytes = GetDeriveBytes(password, saltBytes);
var hashBytes = deriveBytes.GetBytes(HashSizeBytes);
var fullHashBytes = new byte[SaltSizeBytes + HashSizeBytes];
Array.Copy(saltBytes, 0, fullHashBytes, 0, SaltSizeBytes);
Array.Copy(hashBytes, 0, fullHashBytes, SaltSizeBytes, HashSizeBytes);
var hashedPassword = Convert.ToBase64String(fullHashBytes);
return hashedPassword;
}
public bool Verify(string password, string hashedPassword)
{
var fullHashBytes = Convert.FromBase64String(hashedPassword);
var saltBytes = new byte[SaltSizeBytes];
Array.Copy(fullHashBytes, 0, saltBytes, 0, SaltSizeBytes);
using var deriveBytes = GetDeriveBytes(password, saltBytes);
var hashBytes = deriveBytes.GetBytes(HashSizeBytes);
var isMatch = CompareHashes(hashBytes, fullHashBytes);
return isMatch;
}
private static bool CompareHashes(byte[] hashBytes, byte[] fullHashBytes)
{
for (var i = 0; i < HashSizeBytes; i++)
if (hashBytes[i] != fullHashBytes[i + SaltSizeBytes])
return false;
return true;
}
private static Rfc2898DeriveBytes GetDeriveBytes(string password, byte[] saltBytes)
{
return new Rfc2898DeriveBytes(password, saltBytes, RehashCount, HashAlgorithmName.SHA256);
}
}