November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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4
장
직렬화
125
비압축
SEC
형식 직렬화는 간단하지만
256
비트 숫자를
32
바이트로 변환하는 부분은 주의 깊
게 봐야 합니다. 아래 코드가 바로 방금 언급한 부분입니다.
class S256Point(Point):
...
def sec(self):
'''returns the binary version of the SEC format'''
return b'\x04' + self.x.num.to_bytes(32, 'big') \
+ self.y.num.to_bytes(32, 'big')
➊
➊ 파이썬
3
에서 정수형 숫자를
bytes
형으로 바꾸는
to
_
bytes
메서드를 사용합니다. 첫 번
째 매개변수는 변환 결과를 보관할
bytes
형 상수의 길이입니다. 두 번째 매개변수는 빅엔
디언인 경우
big
, 리틀엔디언인 경우
little
의 문자열 값을 갖습니다 (
NOTE
_ 빅엔디언과
리틀엔디언 참고 ).
연습문제
4.1
아래의 비밀키에 대응하는 공개키를 비압축
SEC
형식으로 구하시오.
•
5
,
000
•
2
,
018
5
•
0xdeadbeef12345
4.2
압축
SEC
형식
기억하겠지만 같은
x
좌푯값을 갖는 타원곡선 위 점은
2
개가 있습니다. 이는 타원곡선 방정식
의
y
2
항 때문입니다.
밑바닥부터 시작하는 비트코인
126
그림
4-2
동일한
x
좌푯값을 갖는 타원곡선과 직선의 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.