mirror of https://github.com/torvalds/linux.git
79 lines
2.3 KiB
C
79 lines
2.3 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 an
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* architecture-optimized implementation or a generic implementation. The
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* generic implementation is either 32-bit, or 64-bit 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 <crypto/utils.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/module.h>
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static const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 };
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static const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
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#ifdef CONFIG_CRYPTO_LIB_CURVE25519_ARCH
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#include "curve25519.h" /* $(SRCARCH)/curve25519.h */
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#else
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static void 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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curve25519_generic(mypublic, secret, basepoint);
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}
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static void 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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curve25519_generic(pub, secret, curve25519_base_point);
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}
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#endif
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bool __must_check
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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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curve25519_arch(mypublic, secret, basepoint);
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return crypto_memneq(mypublic, curve25519_null_point,
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CURVE25519_KEY_SIZE);
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}
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EXPORT_SYMBOL(curve25519);
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bool __must_check
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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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if (unlikely(!crypto_memneq(secret, curve25519_null_point,
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CURVE25519_KEY_SIZE)))
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return false;
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curve25519_base_arch(pub, secret);
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return crypto_memneq(pub, curve25519_null_point, CURVE25519_KEY_SIZE);
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}
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EXPORT_SYMBOL(curve25519_generate_public);
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#ifdef curve25519_mod_init_arch
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static int __init curve25519_mod_init(void)
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{
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curve25519_mod_init_arch();
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return 0;
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}
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subsys_initcall(curve25519_mod_init);
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static void __exit curve25519_mod_exit(void)
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{
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}
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module_exit(curve25519_mod_exit);
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#endif
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Curve25519 algorithm");
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MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
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