Review

finding-2

/mubench/checkouts/itext/5091/build/src/main/java//com/itextpdf/text/pdf/PdfPKCS7.java

class PdfPKCS7 {
    /**
     * Verifies a signature using the sub-filter adbe.x509.rsa_sha1.
     * @param contentsKey the /Contents key
     * @param certsKey the /Cert key
     * @param provider the provider or <code>null</code> for the default provider
     */
    @SuppressWarnings("unchecked")
    public PdfPKCS7(byte[] contentsKey, byte[] certsKey, String provider) {
        try {
            this.provider = provider;
            X509CertParser cr = new X509CertParser();
            cr.engineInit(new ByteArrayInputStream(certsKey));
            certs = cr.engineReadAll();
            signCerts = certs;
            signCert = (X509Certificate)certs.iterator().next();
            crls = new ArrayList<CRL>();
            ASN1InputStream in = new ASN1InputStream(new ByteArrayInputStream(contentsKey));
            digest = ((DEROctetString)in.readObject()).getOctets();
            if (provider == null)
                sig = Signature.getInstance("SHA1withRSA");
            else
                sig = Signature.getInstance("SHA1withRSA", provider);
            sig.initVerify(signCert.getPublicKey());
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }

}