forked from Qortal/Brooklyn
111 lines
2.9 KiB
C
111 lines
2.9 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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* 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 <zinc/curve25519.h>
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#include "../selftest/run.h"
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#include <asm/unaligned.h>
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#include <linux/version.h>
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#include <linux/string.h>
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#include <linux/random.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <crypto/algapi.h> // For crypto_memneq.
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#if defined(CONFIG_ZINC_ARCH_X86_64)
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#include "curve25519-x86_64-glue.c"
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#elif defined(CONFIG_ZINC_ARCH_ARM)
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#include "curve25519-arm-glue.c"
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#else
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static bool *const curve25519_nobs[] __initconst = { };
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static void __init curve25519_fpu_init(void)
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{
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}
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static inline bool curve25519_arch(u8 mypublic[CURVE25519_KEY_SIZE],
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const u8 secret[CURVE25519_KEY_SIZE],
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const u8 basepoint[CURVE25519_KEY_SIZE])
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{
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return false;
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}
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static inline bool curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
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const u8 secret[CURVE25519_KEY_SIZE])
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{
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return false;
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}
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#endif
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#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
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#include "curve25519-hacl64.c"
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#else
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#include "curve25519-fiat32.c"
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#endif
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static const u8 null_point[CURVE25519_KEY_SIZE] = { 0 };
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bool curve25519(u8 mypublic[CURVE25519_KEY_SIZE],
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const u8 secret[CURVE25519_KEY_SIZE],
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const u8 basepoint[CURVE25519_KEY_SIZE])
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{
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if (!curve25519_arch(mypublic, secret, basepoint))
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curve25519_generic(mypublic, secret, basepoint);
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return crypto_memneq(mypublic, null_point, CURVE25519_KEY_SIZE);
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}
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bool curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
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const u8 secret[CURVE25519_KEY_SIZE])
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{
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static const u8 basepoint[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
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if (unlikely(!crypto_memneq(secret, null_point, CURVE25519_KEY_SIZE)))
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return false;
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if (curve25519_base_arch(pub, secret))
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return crypto_memneq(pub, null_point, CURVE25519_KEY_SIZE);
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return curve25519(pub, secret, basepoint);
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}
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void curve25519_generate_secret(u8 secret[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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#include "../selftest/curve25519.c"
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static bool nosimd __initdata = false;
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#ifndef COMPAT_ZINC_IS_A_MODULE
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int __init curve25519_mod_init(void)
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#else
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static int __init mod_init(void)
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#endif
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{
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if (!nosimd)
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curve25519_fpu_init();
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if (!selftest_run("curve25519", curve25519_selftest, curve25519_nobs,
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ARRAY_SIZE(curve25519_nobs)))
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return -ENOTRECOVERABLE;
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return 0;
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}
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#ifdef COMPAT_ZINC_IS_A_MODULE
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static void __exit mod_exit(void)
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{
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}
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module_param(nosimd, bool, 0);
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module_init(mod_init);
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module_exit(mod_exit);
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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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#endif
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