Scenarij 3.3: Izdavanje Code-Signing certifikata

Ovaj scenarij opisuje izdavanje Code-Signing certifikata za potpisivanje softvera. Code-Signing omogućuje verifikaciju podrijetla i integriteta izvršnih datoteka, DLL-ova, skripti i paketa.

Slučajevi uporabe:

• Windows Authenticode (EXE, DLL, MSI)
• PowerShell skripte
• Java JAR datoteke
• NuGet paketi
• macOS Code Signing
• Potpisivanje firmwarea

using WvdS.Security.Cryptography.X509Certificates.Extensions.PQ;
 
using var ctx = PqCryptoContext.Initialize();
 
var caCert = ctx.LoadCertificate("codesign-ca.crt.pem");
var caKey = ctx.LoadPrivateKey("codesign-ca.key.pem", "CaPassword!");
 
var csr = ctx.LoadCertificateRequest(File.ReadAllText("codesign.csr.pem"));
csr.VerifySignature();
 
// Izdavanje Code-Signing certifikata
var codesignCert = ctx.IssueCertificate(
    csr,
    issuerCert: caCert,
    issuerKey: caKey,
    serialNumber: ctx.GenerateSerialNumber(),
    validDays: 730,  // 2 godine
    extensions: new ExtBuilder()
        .BasicConstraints(ca: false, critical: true)
        // Key Usage: Samo digitalSignature!
        .KeyUsage(KeyUsageFlags.DigitalSignature, critical: true)
        // Extended Key Usage: Code Signing
        .ExtendedKeyUsage(ExtKeyUsage.CodeSigning)
        .SubjectKeyIdentifier(csr.PublicKey)
        .AuthorityKeyIdentifier(caCert)
        // Timestamping URL za dugotrajnu validaciju
        .AuthorityInfoAccess(
            ocspUrl: "http://ocsp.example.com",
            timestampUrl: "http://timestamp.example.com"
        )
        .Build()
);
 
codesignCert.ToPemFile("codesign.crt.pem");

# Sa SignTool i PQ-certifikatom
signtool sign /fd SHA256 /f codesign.pfx /p "Password" /tr http://timestamp.example.com /td SHA256 myapp.exe
 
# Provjera potpisa
signtool verify /pa /v myapp.exe

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Wolfgang van der Stille @ EMSR DATA d.o.o. - Post-Quantum Cryptography Professional