Add parsing for the OCSPResponse top level components:
OCSPResponse ::= SEQUENCE {
responseStatus OCSPResponseStatus,
responseBytes [0] EXPLICIT ResponseBytes OPTIONAL }
The added code does the following:
1. Parse the top level SEQUENCE
2. Call x509_ocsp_get_response_status() which will parse the
responseStatus in the future
3. If there is any data left in the buffer, parses the EXPLICIT
tag and calls x509_ocsp_get_response_bytes() which will parse
the responseBytes in the future
At this stage, the main framework for the code is being set up. The idea
is that each function will parse the top level components of the ASN1
objects and hand over the parsing of each of the individual
sub-components to other functions. Also, note that each function its
responsible for checking that:
1. At the begining, there is enough space in the buffer p to parse
whatever is being processed before end.
2. Prior to returning, the length specified in the ASN1 encoding
matches the number of bytes consumed from the buffer p.
3. The lengths of any intermediate sub-components (such as EXPLICIT
tags) parsed matches the number of bytes consumed by the called
functions x509_ocsp_get_*().
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