38 lines
1.4 KiB
C#
38 lines
1.4 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace StellaOps.Evidence.Bundle;
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/// <summary>Content-addressed hash set for all evidence artifacts.</summary>
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public sealed class EvidenceHashSet
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{
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public string Algorithm { get; init; } = "SHA-256";
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public required IReadOnlyList<string> Hashes { get; init; }
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public required string CombinedHash { get; init; }
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public IReadOnlyDictionary<string, string>? LabeledHashes { get; init; }
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public static EvidenceHashSet Compute(IDictionary<string, string> labeledHashes)
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{
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ArgumentNullException.ThrowIfNull(labeledHashes);
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var sorted = labeledHashes.OrderBy(kvp => kvp.Key, StringComparer.Ordinal).ToList();
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var combined = string.Join(":", sorted.Select(kvp => $"{kvp.Key}={kvp.Value}"));
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var hash = ComputeSha256(combined);
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return new EvidenceHashSet
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{
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Hashes = sorted.Select(kvp => kvp.Value).ToList(),
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CombinedHash = hash,
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LabeledHashes = sorted.ToDictionary(kvp => kvp.Key, kvp => kvp.Value)
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};
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}
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public static EvidenceHashSet Empty() => new()
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{
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Hashes = Array.Empty<string>(),
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CombinedHash = ComputeSha256(string.Empty),
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LabeledHashes = new Dictionary<string, string>()
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};
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private static string ComputeSha256(string input) =>
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Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(input))).ToLowerInvariant();
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}
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