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To verify PKCS7 signature

There are ready-made tools available for most programming languages that can be used to verify PKCS7 signatures. Below is a small code example in C# that hopefully makes it clearer:

private bool validateSignPKCS7(string toValidate)
{
    byte[] fromCMSString = null;
    SignedCms cms = null;
    try
    {
        fromCMSString = Convert.FromBase64String(toValidate);
        cms = new SignedCms();
        cms.Decode(fromCMSString);
        cms.CheckSignature(true);
    }
    catch (Exception u)
    {
        return false;
    }
    return true;
}

The PKCS7 signature should contain the certificate of the person who is authenticating/signing. That certificate needs to be verified.

To verify PKCS1 signature

To verify Certificate