63 lines
2.6 KiB
Python
63 lines
2.6 KiB
Python
#-*- coding: utf-8 -*-
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'''
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Copyright (c) 2016 NSR (National Security Research Institute)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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'''
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from .lsh256 import LSH256
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from .lsh512 import LSH512
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## 해쉬 함수 wrapper 클래스
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class LSHDigest:
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## 파라미터에 맞는 LSH 알고리즘 객체 생성
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# @param [in] wordlenbits 워드 길이 (비트) 256, 512만 가능함
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# @param [in] outlenbits 출력 길이 (비트) 1 ~ 256 (LSH-256) 혹은 1 ~ 512 (LSH-512) 가 가능함
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# @return LSH 객체
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@staticmethod
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def getInstance(wordlenbits, outlenbits = None):
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if outlenbits is None:
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outlenbits = wordlenbits
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if wordlenbits == 256:
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return LSH256(outlenbits)
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elif wordlenbits == 512:
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return LSH512(outlenbits)
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else:
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raise ValueError("Unsupported algorithm parameter");
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## digest 함수 - 최종 해쉬값을 계산하여 리턴한다.
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# @param [in] wordlenbits 워드 길이 256, 512 중 하나여야 함
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# @param [in] outlenbits 출력 해시 길이 1 ~ wordlenbits 사이의 값이어야 함
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# @param [in] data 입력 데이터
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# @param [in] offset 데이터 시작 오프셋 (바이트)
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# @param [in] length 데이터 길이 (비트)
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# @return 계산된 해쉬값
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@staticmethod
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def digest(wordlenbits, outlenbits = None, data = None, offset = 0, length = -1):
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if outlenbits is None:
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outlenbits = wordlenbits
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lsh = LSHDigest.getInstance(wordlenbits, outlenbits)
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return lsh.final(data, offset, length) |