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61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
# Copyright 2013 Donald Stufft and individual contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import, division, print_function
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from nacl import exceptions as exc
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from nacl._sodium import ffi, lib
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from nacl.exceptions import ensure
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crypto_scalarmult_BYTES = lib.crypto_scalarmult_bytes()
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crypto_scalarmult_SCALARBYTES = lib.crypto_scalarmult_scalarbytes()
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def crypto_scalarmult_base(n):
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"""
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Computes and returns the scalar product of a standard group element and an
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integer ``n``.
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:param n: bytes
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:rtype: bytes
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"""
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q = ffi.new("unsigned char[]", crypto_scalarmult_BYTES)
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rc = lib.crypto_scalarmult_base(q, n)
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ensure(rc == 0,
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'Unexpected library error',
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raising=exc.RuntimeError)
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return ffi.buffer(q, crypto_scalarmult_SCALARBYTES)[:]
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def crypto_scalarmult(n, p):
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"""
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Computes and returns the scalar product of the given group element and an
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integer ``n``.
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:param p: bytes
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:param n: bytes
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:rtype: bytes
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"""
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q = ffi.new("unsigned char[]", crypto_scalarmult_BYTES)
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rc = lib.crypto_scalarmult(q, n, p)
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ensure(rc == 0,
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'Unexpected library error',
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raising=exc.RuntimeError)
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return ffi.buffer(q, crypto_scalarmult_SCALARBYTES)[:]
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