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This contains two formally verified C implementations of the Curve25519 scalar multiplication function, one for 32-bit systems, and one for 64-bit systems whose compiler supports efficient 128-bit integer types. Not only are these implementations formally verified, but they are also the fastest available C implementations. They have been modified to be friendly to kernel space and to be generally less horrendous looking, but still an effort has been made to retain their formally verified characteristic, and so the C might look slightly unidiomatic. The 64-bit version comes from HACL*: https://github.com/project-everest/hacl-star The 32-bit version comes from Fiat: https://github.com/mit-plv/fiat-crypto Information: https://cr.yp.to/ecdh.html Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> [ardb: - move from lib/zinc to lib/crypto - replace .c #includes with Kconfig based object selection - drop simd handling and simplify support for per-arch versions ] Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
26 lines
879 B
C
26 lines
879 B
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This is an implementation of the Curve25519 ECDH algorithm, using either
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* a 32-bit implementation or a 64-bit implementation with 128-bit integers,
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* depending on what is supported by the target compiler.
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*
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* Information: https://cr.yp.to/ecdh.html
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*/
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#include <crypto/curve25519.h>
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#include <linux/module.h>
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#include <linux/init.h>
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const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 };
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const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
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EXPORT_SYMBOL(curve25519_null_point);
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EXPORT_SYMBOL(curve25519_base_point);
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EXPORT_SYMBOL(curve25519_generic);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Curve25519 scalar multiplication");
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MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
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