Fix incorrect usage of HMAC function in secp core.
=* hmc hmac-sha256l:hmac
=/ v (fil 3 w 1)
=/ k 0
- =. k (hmc k w [+ -]:(as-octs (can 3 [w has] [w prv] [1 0x0] [w v] ~)))
- =. v (hmc k w v w)
- =. k (hmc k w [+ -]:(as-octs (can 3 [w has] [w prv] [1 0x1] [w v] ~)))
- =. v (hmc k w v w)
- (hmc k w v w)
+ =. k (hmc w^k (as-octs (can 3 [w has] [w prv] [1 0x0] [w v] ~)))
+ =. v (hmc w^k w^v)
+ =. k (hmc w^k (as-octs (can 3 [w has] [w prv] [1 0x1] [w v] ~)))
+ =. v (hmc w^k w^v)
+ (hmc w^k w^v)
::
++ ecdsa-raw-sign :: generate signature
|= [has=@uvI prv=@]
