Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jon Oberheide |
209 |
56.33% |
1 |
8.33% |
| Jussi Kivilinna |
103 |
27.76% |
2 |
16.67% |
| James Morris |
23 |
6.20% |
2 |
16.67% |
| Ard Biesheuvel |
19 |
5.12% |
1 |
8.33% |
| Jeff Johnson |
5 |
1.35% |
1 |
8.33% |
| Andrew Morton |
5 |
1.35% |
1 |
8.33% |
| Iuliana Prodan |
3 |
0.81% |
1 |
8.33% |
| Kartikey Mahendra Bhatt |
2 |
0.54% |
1 |
8.33% |
| Eric Biggers |
1 |
0.27% |
1 |
8.33% |
| Herbert Xu |
1 |
0.27% |
1 |
8.33% |
| Total |
371 |
|
12 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API
*
* ARC4 Cipher Algorithm
*
* Jon Oberheide <jon@oberheide.org>
*/
#include <crypto/arc4.h>
#include <linux/module.h>
int arc4_setkey(struct arc4_ctx *ctx, const u8 *in_key, unsigned int key_len)
{
int i, j = 0, k = 0;
ctx->x = 1;
ctx->y = 0;
for (i = 0; i < 256; i++)
ctx->S[i] = i;
for (i = 0; i < 256; i++) {
u32 a = ctx->S[i];
j = (j + in_key[k] + a) & 0xff;
ctx->S[i] = ctx->S[j];
ctx->S[j] = a;
if (++k >= key_len)
k = 0;
}
return 0;
}
EXPORT_SYMBOL(arc4_setkey);
void arc4_crypt(struct arc4_ctx *ctx, u8 *out, const u8 *in, unsigned int len)
{
u32 *const S = ctx->S;
u32 x, y, a, b;
u32 ty, ta, tb;
if (len == 0)
return;
x = ctx->x;
y = ctx->y;
a = S[x];
y = (y + a) & 0xff;
b = S[y];
do {
S[y] = a;
a = (a + b) & 0xff;
S[x] = b;
x = (x + 1) & 0xff;
ta = S[x];
ty = (y + ta) & 0xff;
tb = S[ty];
*out++ = *in++ ^ S[a];
if (--len == 0)
break;
y = ty;
a = ta;
b = tb;
} while (true);
ctx->x = x;
ctx->y = y;
}
EXPORT_SYMBOL(arc4_crypt);
MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
MODULE_LICENSE("GPL");