Make extended ECDSA signing routines internal
ECDSA_sign_setup() permits precomputing the values of the inverse of the
random k and the corresponding r. These can then be fed into the signing
routines ECDSA_{do_,}sign_ex() multiple times if needed. This is not a
great idea and the interface adds a lot of unwanted complexity.
Not to mention that nothing ever used this correctly - if s works out to
0, a special error code is thrown requesting that the caller provide new
kinv and r values. Unsurprisingly, nobody ever checked for that special
error code.
ok jsing
This commit marks the start of a libcrypto major bump. Do not build the
tree until I bumped the shlib_version and synced file sets (in about 35
commits).