a db @s^dZddlZddlmZddlmZmZmZddlm Z gdZ dd Z d d Z dd dZ dS)a 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 N)hexlify)number_to_stringnumber_to_string_crop bit_length) hmac_compat)rbits2int bits2octets generate_kcCs2tt|d}t|d}||kr.|||?S|S)N)intrlen)dataqlenxlr^/home/tom/ab/renpy-build/tmp/install.linux-x86_64/lib/python3.9/site-packages/ecdsa/rfc6979.pyrs   rcCs,t|t|}||}|dkr"|}t||S)Nr)rrr)rorderZz1Zz2rrrr s r cCszt|}|j}|dd}tt||tt||t|f} d|} d|} tj| |d} | | d| D]} | | qn| } t| | |} tj| |d} | | d| D]} | | q| } t| | |} d} t | |krt| | |} | | 7} qt | |}d|kr2|krLnn|dkrD|S|d8}t| | d|} t| | |} qd S) a 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 r ) digestmodrrrN) r digest_sizerrr hmacnewupdatedigestrr)rZsecexpZ hash_funcrZ retry_genZ extra_entropyrZholenZrolenbxvkitsecretrrrr +s@         r )rr)__doc__rbinasciirutilrrrZ_compatr__all__rr r rrrrs