* dsa-verify.c (dsa_verify_digest): New function.

(dsa_verify): Most of the code moved to dsa_verify_digest, which
is used here.
* dsa-sign.c (dsa_sign_digest): New function.
(dsa_sign): Most of the code moved to dsa_sign_digest, which is
used here.
* dsa.c (_dsa_hash): Deleted function.

Rev: src/nettle/dsa-sign.c:1.5
Rev: src/nettle/dsa-verify.c:1.3