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>
77 lines
1.2 KiB
C
77 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API
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*
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* ARC4 Cipher Algorithm
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*
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* Jon Oberheide <jon@oberheide.org>
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*/
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#include <crypto/arc4.h>
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#include <linux/export.h>
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#include <linux/module.h>
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int arc4_setkey(struct arc4_ctx *ctx, const u8 *in_key, unsigned int key_len)
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{
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int i, j = 0, k = 0;
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ctx->x = 1;
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ctx->y = 0;
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for (i = 0; i < 256; i++)
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ctx->S[i] = i;
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for (i = 0; i < 256; i++) {
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u32 a = ctx->S[i];
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j = (j + in_key[k] + a) & 0xff;
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ctx->S[i] = ctx->S[j];
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ctx->S[j] = a;
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if (++k >= key_len)
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k = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL(arc4_setkey);
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void arc4_crypt(struct arc4_ctx *ctx, u8 *out, const u8 *in, unsigned int len)
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{
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u32 *const S = ctx->S;
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u32 x, y, a, b;
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u32 ty, ta, tb;
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if (len == 0)
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return;
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x = ctx->x;
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y = ctx->y;
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a = S[x];
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y = (y + a) & 0xff;
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b = S[y];
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do {
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S[y] = a;
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a = (a + b) & 0xff;
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S[x] = b;
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x = (x + 1) & 0xff;
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ta = S[x];
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ty = (y + ta) & 0xff;
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tb = S[ty];
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*out++ = *in++ ^ S[a];
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if (--len == 0)
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break;
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y = ty;
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a = ta;
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b = tb;
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} while (true);
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ctx->x = x;
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ctx->y = y;
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}
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EXPORT_SYMBOL(arc4_crypt);
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MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
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MODULE_LICENSE("GPL");
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