vcl mscrypto PDF sign: fix typo in GetDERLengthOfLength()

When id-aa-signingCertificateV2 had a value that was larger than 255
bytes, then the header size is expected to be 4 bytes, but it was only
3. The length part of the header is 3 bytes: one byte declaring the
length-of-length, and 3 bytes for the length. We added this additional
byte to the result too early, that way we counted that e.g. 278 (the
number) fits into a single uint8_t, which is not the case.

Also introduce named constants for some of the hardwired numbers in the
code for better readability.

Change-Id: I816236e5ac561c9d21bd9df703385ee2201482e7

0 files changed, 0 insertions, 0 deletions