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Modify usage and features section in README.md file
그리고 찾아보니 RSA 알고리즘은 그 자체로 서명 알고리즘은 아니고 RSA-PSS와 RSASSA-PSS 등의 서명 알고리즘이 있었고 저희가 사용하는 RSA 서명 알고리즘은 golang 라이브러리를 보니 RSASSA-PSS 였습니다.
PSSOption의 사용 이유도 RSASSA-PSS에서 메시지 해싱 이후에 바로 서명(private key로 암호화)이 아니라 해싱된 메시지에 대해 Encoded Message라는 폼으로 한 번 더 마스크 씌우고 해싱 등.. 과정이 있더라고요 :)