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RFC 6979:
Deterministic Usage of the Digital Signature Algorithm (DSA) and
Elliptic Curve Digital Signature Algorithm (ECDSA)
http://tools.ietf.org/html/rfc6979
Many thanks to Coda Hale for his implementation in Go language:
https://github.com/codahale/rfc6979
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order - order of the DSA generator used in the signature
secexp - secure exponent (private key) in numeric form
hash_func - reference to the same hash function used for generating hash
data - hash in binary form of the signing data
retry_gen - int - how many good 'k' values to skip before returning
extra_entropy - extra added data in binary form as per section-3.6 of
rfc6979
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