117 lines
4.6 KiB
Python
117 lines
4.6 KiB
Python
# This file is licensed under the BSD 2-Clause License.
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# See https://opensource.org/licenses/BSD-2-Clause for details.
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from ._curve import _Curve
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from Crypto.Math.Numbers import Integer
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from Crypto.Util._raw_api import (load_pycryptodome_raw_lib, VoidPointer,
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SmartPointer)
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def ed25519_curve():
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p = 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed # 2**255 - 19
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order = 0x1000000000000000000000000000000014def9dea2f79cd65812631a5cf5d3ed
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Gx = 0x216936d3cd6e53fec0a4e231fdd6dc5c692cc7609525a7b2c9562d608f25d51a
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Gy = 0x6666666666666666666666666666666666666666666666666666666666666658
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_ed25519_lib = load_pycryptodome_raw_lib("Crypto.PublicKey._ed25519", """
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typedef void Point;
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int ed25519_new_point(Point **out,
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const uint8_t x[32],
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const uint8_t y[32],
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size_t modsize,
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const void *context);
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int ed25519_clone(Point **P, const Point *Q);
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void ed25519_free_point(Point *p);
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int ed25519_cmp(const Point *p1, const Point *p2);
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int ed25519_neg(Point *p);
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int ed25519_get_xy(uint8_t *xb, uint8_t *yb, size_t modsize, Point *p);
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int ed25519_double(Point *p);
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int ed25519_add(Point *P1, const Point *P2);
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int ed25519_scalar(Point *P, const uint8_t *scalar, size_t scalar_len, uint64_t seed);
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""")
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class EcLib(object):
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new_point = _ed25519_lib.ed25519_new_point
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clone = _ed25519_lib.ed25519_clone
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free_point = _ed25519_lib.ed25519_free_point
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cmp = _ed25519_lib.ed25519_cmp
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neg = _ed25519_lib.ed25519_neg
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get_xy = _ed25519_lib.ed25519_get_xy
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double = _ed25519_lib.ed25519_double
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add = _ed25519_lib.ed25519_add
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scalar = _ed25519_lib.ed25519_scalar
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ed25519 = _Curve(Integer(p),
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None,
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Integer(order),
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Integer(Gx),
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Integer(Gy),
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None,
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255,
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"1.3.101.112", # RFC8410
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None,
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"Ed25519",
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"ssh-ed25519",
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EcLib)
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return ed25519
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def ed448_curve():
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p = 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffffffffffffffffffffffffffffffffffffffffffffffffffff # 2**448 - 2**224 - 1
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order = 0x3fffffffffffffffffffffffffffffffffffffffffffffffffffffff7cca23e9c44edb49aed63690216cc2728dc58f552378c292ab5844f3
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Gx = 0x4f1970c66bed0ded221d15a622bf36da9e146570470f1767ea6de324a3d3a46412ae1af72ab66511433b80e18b00938e2626a82bc70cc05e
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Gy = 0x693f46716eb6bc248876203756c9c7624bea73736ca3984087789c1e05a0c2d73ad3ff1ce67c39c4fdbd132c4ed7c8ad9808795bf230fa14
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_ed448_lib = load_pycryptodome_raw_lib("Crypto.PublicKey._ed448", """
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typedef void EcContext;
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typedef void PointEd448;
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int ed448_new_context(EcContext **pec_ctx);
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void ed448_context(EcContext *ec_ctx);
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void ed448_free_context(EcContext *ec_ctx);
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int ed448_new_point(PointEd448 **out,
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const uint8_t x[56],
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const uint8_t y[56],
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size_t len,
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const EcContext *context);
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int ed448_clone(PointEd448 **P, const PointEd448 *Q);
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void ed448_free_point(PointEd448 *p);
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int ed448_cmp(const PointEd448 *p1, const PointEd448 *p2);
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int ed448_neg(PointEd448 *p);
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int ed448_get_xy(uint8_t *xb, uint8_t *yb, size_t len, const PointEd448 *p);
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int ed448_double(PointEd448 *p);
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int ed448_add(PointEd448 *P1, const PointEd448 *P2);
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int ed448_scalar(PointEd448 *P, const uint8_t *scalar, size_t scalar_len, uint64_t seed);
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""")
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class EcLib(object):
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new_point = _ed448_lib.ed448_new_point
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clone = _ed448_lib.ed448_clone
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free_point = _ed448_lib.ed448_free_point
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cmp = _ed448_lib.ed448_cmp
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neg = _ed448_lib.ed448_neg
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get_xy = _ed448_lib.ed448_get_xy
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double = _ed448_lib.ed448_double
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add = _ed448_lib.ed448_add
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scalar = _ed448_lib.ed448_scalar
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ed448_context = VoidPointer()
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result = _ed448_lib.ed448_new_context(ed448_context.address_of())
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if result:
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raise ImportError("Error %d initializing Ed448 context" % result)
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context = SmartPointer(ed448_context.get(), _ed448_lib.ed448_free_context)
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ed448 = _Curve(Integer(p),
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None,
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Integer(order),
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Integer(Gx),
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Integer(Gy),
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None,
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448,
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"1.3.101.113", # RFC8410
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context,
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"Ed448",
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None,
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EcLib)
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return ed448
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