Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The ChaCha stream cipher (RFC7539)
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*
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* Copyright (C) 2015 Martin Willi
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*/
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#include <crypto/algapi.h> // for crypto_xor_cpy
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#include <crypto/chacha.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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static void __maybe_unused
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chacha_crypt_generic(struct chacha_state *state, u8 *dst, const u8 *src,
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unsigned int bytes, int nrounds)
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{
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/* aligned to potentially speed up crypto_xor() */
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u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long));
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while (bytes >= CHACHA_BLOCK_SIZE) {
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chacha_block_generic(state, stream, nrounds);
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crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE);
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bytes -= CHACHA_BLOCK_SIZE;
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dst += CHACHA_BLOCK_SIZE;
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src += CHACHA_BLOCK_SIZE;
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}
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if (bytes) {
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chacha_block_generic(state, stream, nrounds);
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crypto_xor_cpy(dst, src, stream, bytes);
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}
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}
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#ifdef CONFIG_CRYPTO_LIB_CHACHA_ARCH
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#include "chacha.h" /* $(SRCARCH)/chacha.h */
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#else
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#define chacha_crypt_arch chacha_crypt_generic
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#define hchacha_block_arch hchacha_block_generic
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#endif
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void chacha_crypt(struct chacha_state *state, u8 *dst, const u8 *src,
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unsigned int bytes, int nrounds)
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{
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chacha_crypt_arch(state, dst, src, bytes, nrounds);
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}
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EXPORT_SYMBOL_GPL(chacha_crypt);
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void hchacha_block(const struct chacha_state *state,
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u32 out[HCHACHA_OUT_WORDS], int nrounds)
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{
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hchacha_block_arch(state, out, nrounds);
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}
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EXPORT_SYMBOL_GPL(hchacha_block);
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#ifdef chacha_mod_init_arch
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static int __init chacha_mod_init(void)
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{
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chacha_mod_init_arch();
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return 0;
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}
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subsys_initcall(chacha_mod_init);
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static void __exit chacha_mod_exit(void)
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{
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}
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module_exit(chacha_mod_exit);
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#endif
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MODULE_DESCRIPTION("ChaCha stream cipher (RFC7539)");
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MODULE_LICENSE("GPL");
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