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XML Signature works with random RSA Key but not with key from certificate


XML Signature works with random RSA Key but not with key from certificate

By : user4576890
Date : November 21 2020, 07:38 AM
this will help I finally found a solution to my problem. If it can help someone :
Previously I try to get the private key from the certificate by this way :
code :
RSA Key = new GestionCertificat("CN=EbicsAuth").getClePrivee();//Get the private key
String CertificatEncoded;
    String ModulusEncoded;
    String ExponentEncoded;
    RSA Cle;
    RSA ClePrivee;
    X509Certificate2 Certificat;
    public GestionCertificat(String NomCertificat)
    {
        X509Store store = new X509Store(StoreLocation.CurrentUser);
        store.Open(OpenFlags.ReadOnly);
        X509Certificate2Collection certCollection = store.Certificates;
        X509Certificate2 cert = null;
        foreach (X509Certificate2 c in certCollection)
        {
            if (c.Subject == NomCertificat)
            {
                cert = c;
                break;
            }
        }
        store.Close();
        Certificat = cert;
        CertificatEncoded = Convert.ToBase64String(cert.RawData); //Conversion du certificat en base64
        RSACryptoServiceProvider rsaprovider = (RSACryptoServiceProvider)cert.PublicKey.Key;//Récupération de la clé RSA du certificat
        RSAParameters newparams = rsaprovider.ExportParameters(false);//Extractions des paramètres de la clé
        ModulusEncoded = Convert.ToBase64String(newparams.Modulus);//Conversion du Modulus en base64
        ExponentEncoded = Convert.ToBase64String(newparams.Exponent);//Conversion de l'Exponent en base64
        Cle = (RSA)cert.PublicKey.Key;
        ClePrivee = (RSA)cert.PrivateKey;
    }

    public String getCertificatEncoded()
    {
        return this.CertificatEncoded;
    }

    public String getModulusEncoded()
    {
        return this.ModulusEncoded;
    }

    public String getExponentEncoded()
    {
        return this.ExponentEncoded;
    }

    public RSA getClePublique()
    {
        return this.Cle;
    }

    public RSA getClePrivee()
    {
        return this.ClePrivee;
    }

    public X509Certificate2 getCertificat()
    {
        return this.Certificat;
    }
RSACryptoServiceProvider Key = new RSACryptoServiceProvider();
var gestionCertif = new GestionCertificat("CN=EbicsAuth");
X509Certificate2 Cert = gestionCertif.getCertificat();
Key.FromXmlString(Cert.PrivateKey.ToXmlString(true));


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Simple Electronic Signature: "Signing" PDF Without Certificate for Post-Signature Tamper-Protection

Simple Electronic Signature: "Signing" PDF Without Certificate for Post-Signature Tamper-Protection


By : Bleu King
Date : March 29 2020, 07:55 AM
I wish this help you
Is it possible to benefit from the "tamper-validation" without using a certificate? Like I say, these are not supposed to be digital signatures but rather simple, electronic signatures. Still, I'd like to benefit from any post-signature changes being highlighted.
Pades LTV verification in iTextSharp throws Public key presented not for certificate signature for root CA certificate

Pades LTV verification in iTextSharp throws Public key presented not for certificate signature for root CA certificate


By : Omar Al Kurdi
Date : March 29 2020, 07:55 AM
wish help you to fix your issue After some debugging it turns out that
iText(Sharp) 5.5.10 LtvVerifier fails in the observed manner when verifying certificates with certificate chains not ending in a self-signed certificate.
code :
// Check if the signature is valid
if (issuerCert != null) {
    signCert.Verify(issuerCert.GetPublicKey());
}
// Also in case, the certificate is self-signed
else {
    signCert.Verify(signCert.GetPublicKey());
} 
override public List<VerificationOK> Verify(X509Certificate signCert, X509Certificate issuerCert, DateTime signDate) {
    LOGGER.Info("Root store verification: " + signCert.SubjectDN);
    // verify using the CertificateVerifier if root store is missing
    if (certificates == null)
        return base.Verify(signCert, issuerCert, signDate);
    try {
        List<VerificationOK> result = new List<VerificationOK>();
        // loop over the trusted anchors in the root store
        foreach (X509Certificate anchor in certificates) {
            try {
                signCert.Verify(anchor.GetPublicKey());
                LOGGER.Info("Certificate verified against root store");
                result.Add(new VerificationOK(signCert, this, "Certificate verified against root store."));
                result.AddRange(base.Verify(signCert, issuerCert, signDate));
                return result;
            } catch (GeneralSecurityException) {}
        }
        result.AddRange(base.Verify(signCert, issuerCert, signDate));
        return result;
    } catch (GeneralSecurityException) {
        return base.Verify(signCert, issuerCert, signDate);
    }
}
                signCert.Verify(anchor.GetPublicKey());
                LOGGER.Info("Certificate verified against root store");
                result.Add(new VerificationOK(signCert, this, "Certificate verified against root store."));
                // vvv remove
                result.AddRange(base.Verify(signCert, issuerCert, signDate));
                // ^^^ remove
                return result;
Apple MDM Certificate Signature Verification failed because the signature is invalid

Apple MDM Certificate Signature Verification failed because the signature is invalid


By : Daniel Payne
Date : March 29 2020, 07:55 AM
I hope this helps you . The problem was I updated my MDM Certificate and the signing certificate was using old MDM Certificate. I had to change the signing certificate to reflect the new MDM certificate  
Adfs: Difference between token decrypting certificate and relying party signature verification certificate

Adfs: Difference between token decrypting certificate and relying party signature verification certificate


By : Toto157
Date : March 29 2020, 07:55 AM
hope this fix your issue Good article: AD FS 2.0: How to Replace the SSL, Service Communications, Token-Signing, and Token-Decrypting Certificates.
The Service Communications certificate is essentially the IIS SSL certificate and serves the same purpose.
Explain the Certificate Signature Value field of a X509 Digital Certificate

Explain the Certificate Signature Value field of a X509 Digital Certificate


By : Dave Greco
Date : March 29 2020, 07:55 AM
may help you . It is neither the public key on its own, nor the CSR that was used to request the certificate, that forms the signature input. According to RFC 5280 - Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile:
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