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>
37 lines
1.0 KiB
C
37 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* ChaCha stream cipher (s390 optimized)
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*
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* Copyright IBM Corp. 2021
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*/
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#include <linux/cpufeature.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/sizes.h>
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#include <asm/fpu.h>
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#include "chacha-s390.h"
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#define hchacha_block_arch hchacha_block_generic /* not implemented yet */
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static void chacha_crypt_arch(struct chacha_state *state, u8 *dst,
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const u8 *src, unsigned int bytes, int nrounds)
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{
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/* s390 chacha20 implementation has 20 rounds hard-coded,
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* it cannot handle a block of data or less, but otherwise
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* it can handle data of arbitrary size
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*/
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if (bytes <= CHACHA_BLOCK_SIZE || nrounds != 20 || !cpu_has_vx()) {
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chacha_crypt_generic(state, dst, src, bytes, nrounds);
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} else {
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DECLARE_KERNEL_FPU_ONSTACK32(vxstate);
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kernel_fpu_begin(&vxstate, KERNEL_VXR);
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chacha20_vx(dst, src, bytes, &state->x[4], &state->x[12]);
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kernel_fpu_end(&vxstate, KERNEL_VXR);
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state->x[12] += round_up(bytes, CHACHA_BLOCK_SIZE) /
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CHACHA_BLOCK_SIZE;
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}
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}
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