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2143d622cd
Add the at_least (i.e. 'static') decoration to the fixed-size array parameters of the curve25519 library functions. This causes clang to warn when a too-small array of known size is passed. Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com> Link: https://lore.kernel.org/r/20251122194206.31822-3-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
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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#ifndef CURVE25519_H
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#define CURVE25519_H
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#include <linux/types.h>
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#include <linux/random.h>
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enum curve25519_lengths {
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CURVE25519_KEY_SIZE = 32
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};
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void curve25519_generic(u8 out[at_least CURVE25519_KEY_SIZE],
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const u8 scalar[at_least CURVE25519_KEY_SIZE],
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const u8 point[at_least CURVE25519_KEY_SIZE]);
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bool __must_check
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curve25519(u8 mypublic[at_least CURVE25519_KEY_SIZE],
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const u8 secret[at_least CURVE25519_KEY_SIZE],
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const u8 basepoint[at_least CURVE25519_KEY_SIZE]);
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bool __must_check
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curve25519_generate_public(u8 pub[at_least CURVE25519_KEY_SIZE],
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const u8 secret[at_least CURVE25519_KEY_SIZE]);
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static inline void
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curve25519_clamp_secret(u8 secret[at_least CURVE25519_KEY_SIZE])
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{
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secret[0] &= 248;
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secret[31] = (secret[31] & 127) | 64;
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}
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static inline void
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curve25519_generate_secret(u8 secret[at_least CURVE25519_KEY_SIZE])
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{
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get_random_bytes_wait(secret, CURVE25519_KEY_SIZE);
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curve25519_clamp_secret(secret);
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}
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#endif /* CURVE25519_H */
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