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#440fix#433
Rework the EC key generation mechanism to send the curve parameters to
the card. In earlier versions, the applet had a copy of the curve
parameters and there was a different algorithm reference for every
curve. This is unfeasible when trying to support a larger number of
curves because of size limitations of the applet.
This commit additionally includes some refactorings that should not
change the functionality.
when deleting a private key object, overwrite its contents so the key can no longer be used.
(VTA: original commit touched to use LOG macros and add debug logs)
needed to store information about EC curve supported by card.
Primary usage is when importing/generating key to get know if particular curve is supported by card.
Pkcs15init data, used to import/generate key objects, includes twice the same EC parameters data:
- explicit 'params' data
- part of sc_pkcs15_pubkey/sc_pkcs15_prkey
Explicit 'ec-params' data is removed.
b94c163 - invalid, non-tested
11881a6 -- src/libopensc/card-iasecc.c -- return from select has to be ignored,
3a92bf7 -- src/pkcs11/slot.c -- SEGFAULT issue #3733a92bf7 -- src/tools/piv-tool.c -- confirmed by author
6759c04 -- src/pkcs15init/pkcs15-lib.c -- file instantiation error has to be ignored
* Ensure CKA_ALWAYS_SENSITIVE and CKA_NEVER_EXTRACTABLE are only set when
generating the key on board, not reason to set them when importing a private
key.
add the possibility to store public ECC keys encoded according to SPKI
EC pubkey storing: Check if params are available before copying.
pkcs15-lib.c / sc_pkcs15init_store_public_key may be called with keyargs->key.u.ec.params.value == NULL. In this case, allocating and copying the parameters will fail. Add a check to prevent this.
Nguyễn Hồng Quân
Viktor Tarasov
Frank Morgner
Doug Engert
Thomas Calderon
Philip Wendland
Hannu Honkanen
Pedro Martelletto
Andreas Schwier