There's a small bug in scard-opensc.c. The OpenSC function sc_pkcs15_decipher
is called with the wrong flag. Currently sc_private_decrypt set the flag to
0 and hence OpenSC uses RSA raw to decipher the cryptogram => the Smartcard
(or OpenSC) does not remove the PKCS#1 padding => v1 authentication fails
because the returned data has the wrong length. To fix this problem simply
replace:
r = sc_pkcs15_decipher(p15card, key_obj, 0, from, flen, to, flen);
with
r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1, from, flen,
to, flen);

Nils