verify-integrity

name	verify_integrity
description	Verify the digital integrity of forensic evidence and audit logs.

Verify Integrity Skill

Use this skill to ensure that evidence files, database records, and logs have not been tampered with. This is critical for maintaining the Chain of Custody.

Dependencies

• DentalID.Core.Interfaces.IIntegrityService (Hashing logic)
• DentalID.Core.Entities.DentalImage (Stores FileHash)
• System.Security.Cryptography.SHA256

Workflow

1. Verify File Integrity:

   • When loading an evidence file, calculate its SHA-256 hash.
   • Compare it against the stored FileHash in the database (DentalImage.FileHash).
   • Mismatch: Immediately flag as "TAMPERED" and alert the user. Do not proceed with analysis.

2. Verify Audit Log Chain:

   • (If Blockchain/Ledger is implemented)
   • Verify that the PreviousHash of the current log entry matches the Hash of the previous entry.

3. Digital Seal Verification:

   • Check for the presence of a digital signature or watermark on exported PDF reports.

Example Usage (C#)

using System.Security.Cryptography;

public bool VerifyEvidence(DentalImage evidence, string currentFilePath)
{
    if (!File.Exists(currentFilePath)) return false;

    // Use Interface Method
    var currentHash = await integrityService.ComputeFileHashAsync(currentFilePath);

    // Compare
    bool isValid = string.Equals(currentHash, evidence.FileHash, StringComparison.OrdinalIgnoreCase);

    if (!isValid)
    {
        Console.WriteLine($"[SECURITY ALERT] Hash Mismatch for Image {evidence.Id}!");
        Console.WriteLine($"Expected: {evidence.FileHash}");
        Console.WriteLine($"Actual:   {currentHash}");
    }

    return isValid;
}