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Fix X25519 base-point according to RFC7748

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Mark Qvist
2025-02-25 12:27:15 +01:00
parent 28bcf6a8ac
commit 77c0beecf2
1 changed files with 4 additions and 1 deletions
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RNS/Cryptography/X25519.py
+4 -1
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@@ -82,10 +82,13 @@ def _fix_secret(n):
n |= 64 << 8 * 31 n |= 64 << 8 * 31
return n return n
def _fix_base_point(n):
n &= ~(2**255)
return n
def curve25519(base_point_raw, secret_raw): def curve25519(base_point_raw, secret_raw):
"""Raise the base point to a given power""" """Raise the base point to a given power"""
base_point = _unpack_number(base_point_raw) base_point = _fix_base_point(_unpack_number(base_point_raw))
secret = _fix_secret(_unpack_number(secret_raw)) secret = _fix_secret(_unpack_number(secret_raw))
return _pack_number(_raw_curve25519(base_point, secret)) return _pack_number(_raw_curve25519(base_point, secret))