LGTM
LGTM please wrap the comments at top of ecdsa.go and add to pkg/Makefile.
Hello rsc, cw (cc: golang-dev@googlegroups.com), I'd like you to review this change to https://go.googlecode.com/hg/
*** Submitted as http://code.google.com/p/go/source/detail?r=20246d5d70d2 *** crypto/ecdsa: add package. R=rsc, cw CC=golang-dev http://codereview.appspot.com/4253073