UserDataType

• The data element must specify the attributes

  Attribute name	Required?	Value
  version	Yes	1.0
  encoding	Yes	base64

• The user data is base64-encoded as per RFC3548 with the additional restrictions

  • Implementations MUST NOT add linefeeds to encoded data

  • Implementations MUST pad (end of) encoded data with '=' if required

  • Implementations MUST ignore characters in the encoded stream that are not in the encoding alphabet. Note that this differs from what RFC3548 says. It is included because it provides more leeway for clients.

  • Encoding alphabet as per table 1 in RFC3548 (i.e. A-Za-z0-9+/)

  • The size limit on the user data applies to the data before base64 encoding