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src/__Libraries/StellaOps.Cryptography/DefaultCryptoHasher.cs

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+using System;
+using System.Security.Cryptography;
+
+namespace StellaOps.Cryptography;
+
+/// <summary>
+/// Default implementation of <see cref="ICryptoHasher"/> using BCL cryptographic primitives.
+/// </summary>
+public sealed class DefaultCryptoHasher : ICryptoHasher
+{
+    public DefaultCryptoHasher(string algorithmId)
+    {
+        if (string.IsNullOrWhiteSpace(algorithmId))
+        {
+            throw new ArgumentException("Algorithm identifier is required.", nameof(algorithmId));
+        }
+
+        AlgorithmId = algorithmId.ToUpperInvariant();
+    }
+
+    public string AlgorithmId { get; }
+
+    public byte[] ComputeHash(ReadOnlySpan<byte> data)
+    {
+        return AlgorithmId switch
+        {
+            HashAlgorithms.Sha256 => SHA256.HashData(data),
+            HashAlgorithms.Sha384 => SHA384.HashData(data),
+            HashAlgorithms.Sha512 => SHA512.HashData(data),
+            _ => throw new InvalidOperationException($"Unsupported hash algorithm '{AlgorithmId}'.")
+        };
+    }
+
+    public string ComputeHashHex(ReadOnlySpan<byte> data)
+    {
+        var hash = ComputeHash(data);
+        return Convert.ToHexStringLower(hash);
+    }
+}