// SPDX-License-Identifier: GPL-2.0 OR MIT /* * Copyright (C) 2015-2019 Jason A. Donenfeld . All Rights Reserved. * * This is an implementation of the Curve25519 ECDH algorithm, using either an * architecture-optimized implementation or a generic implementation. The * generic implementation is either 32-bit, or 64-bit with 128-bit integers, * depending on what is supported by the target compiler. * * Information: https://cr.yp.to/ecdh.html */ #include #include #include #include #include static const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 }; static const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 }; #ifdef CONFIG_CRYPTO_LIB_CURVE25519_ARCH #include "curve25519.h" /* $(SRCARCH)/curve25519.h */ #else static void curve25519_arch(u8 mypublic[CURVE25519_KEY_SIZE], const u8 secret[CURVE25519_KEY_SIZE], const u8 basepoint[CURVE25519_KEY_SIZE]) { curve25519_generic(mypublic, secret, basepoint); } static void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE], const u8 secret[CURVE25519_KEY_SIZE]) { curve25519_generic(pub, secret, curve25519_base_point); } #endif bool __must_check curve25519(u8 mypublic[CURVE25519_KEY_SIZE], const u8 secret[CURVE25519_KEY_SIZE], const u8 basepoint[CURVE25519_KEY_SIZE]) { curve25519_arch(mypublic, secret, basepoint); return crypto_memneq(mypublic, curve25519_null_point, CURVE25519_KEY_SIZE); } EXPORT_SYMBOL(curve25519); bool __must_check curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE], const u8 secret[CURVE25519_KEY_SIZE]) { if (unlikely(!crypto_memneq(secret, curve25519_null_point, CURVE25519_KEY_SIZE))) return false; curve25519_base_arch(pub, secret); return crypto_memneq(pub, curve25519_null_point, CURVE25519_KEY_SIZE); } EXPORT_SYMBOL(curve25519_generate_public); #ifdef curve25519_mod_init_arch static int __init curve25519_mod_init(void) { curve25519_mod_init_arch(); return 0; } subsys_initcall(curve25519_mod_init); static void __exit curve25519_mod_exit(void) { } module_exit(curve25519_mod_exit); #endif MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Curve25519 algorithm"); MODULE_AUTHOR("Jason A. Donenfeld ");