[Opensc-commits] [OpenSC/OpenSC] ee23d2: EC field_length changes for non-multiple of 8 bits...

[GitHub <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSC/OpenSC
  Commit: ee23d286547d730dc82011857b318186140b31f5
      https://github.com/OpenSC/OpenSC/commit/ee23d286547d730dc82011857b318186140b31f5
  Author: Doug Engert <dee...@gm...>
  Date:   2015-04-25 (Sat, 25 Apr 2015)

  Changed paths:
    M src/libopensc/pkcs15-prkey.c
    M src/libopensc/pkcs15-pubkey.c
    M src/libopensc/pkcs15-sc-hsm.c
    M src/pkcs15init/pkcs15-isoApplet.c

  Log Message:
  -----------
  EC field_length changes for non-multiple of 8 bits curves

In OpenSC the EC field_length is the number of bits in the field.
Most curves have a field_length which is a multiple of 8 bits
but there are many that are not.

The X and Y points and privateD are stored in octetstrings
so there may need to be an extra byte in the octetstring.

An OpenSSL BIGNUM will drop leading zero bytes, so its size can not be used
to determine the field_length.

fix #440
fix #433