ViewBer is a System Utilities software developed by Paul Cuthbert. After our trial and test, the software is proved to be official, secure and free. Here is the official description for ViewBer:
BS Editor: ViewBer is a free utility that displays the ASN.1 structure of a BER-encoded file. ViewBer can be used to view the contents of X.509 certificates (PEM and DER encoded), PKCS#12, PKCS#10, CSR files, PKCS#7, etc.
ViewBer supports the recursive decoding of OCTET STRING and BIT STRING objects, and includes a Catalog of many commonly used OIDs in ASN.1 structures. you can free download ViewBer 1.0 now.