diff options
| -rw-r--r-- | sys/crypto/arc4.c | 59 | ||||
| -rw-r--r-- | sys/crypto/arc4.h | 27 |
2 files changed, 86 insertions, 0 deletions
diff --git a/sys/crypto/arc4.c b/sys/crypto/arc4.c new file mode 100644 index 00000000000..fe621dbcd9e --- /dev/null +++ b/sys/crypto/arc4.c @@ -0,0 +1,59 @@ +/* $OpenBSD: arc4.c,v 1.1 2003/10/07 07:07:14 markus Exp $ */ +/* + * Copyright (c) 2003 Markus Friedl <markus@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/types.h> + +#include <crypto/arc4.h> + +#define RC4SWAP(x,y) \ + do { \ + u_int8_t t = ctx->state[x]; \ + ctx->state[x] = ctx->state[y]; \ + ctx->state[y] = t; \ + } while(0) + +void +rc4_keysetup(struct rc4_ctx *ctx, u_char *key, u_int32_t klen) +{ + u_int8_t x, y; + u_int32_t i; + + x = y = 0; + for (i = 0; i < RC4STATE; i++) + ctx->state[i] = i; + for (i = 0; i < RC4STATE; i++) { + y = (key[x] + ctx->state[i] + y) % RC4STATE; + RC4SWAP(i, y); + x = (x + 1) % klen; + } + ctx->x = ctx->y = 0; +} + +void +rc4_crypt(struct rc4_ctx *ctx, u_char *src, u_char *dst, + u_int32_t len) +{ + u_int32_t i; + + for (i = 0; i < len; i++) { + ctx->x = (ctx->x + 1) % RC4STATE; + ctx->y = (ctx->state[ctx->x] + ctx->y) % RC4STATE; + RC4SWAP(ctx->x, ctx->y); + dst[i] = src[i] ^ ctx->state[ + (ctx->state[ctx->x] + ctx->state[ctx->y]) % RC4STATE]; + } +} diff --git a/sys/crypto/arc4.h b/sys/crypto/arc4.h new file mode 100644 index 00000000000..2bbf9227ceb --- /dev/null +++ b/sys/crypto/arc4.h @@ -0,0 +1,27 @@ +/* $OpenBSD: arc4.h,v 1.1 2003/10/07 07:07:14 markus Exp $ */ +/* + * Copyright (c) 2003 Markus Friedl <markus@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#define RC4STATE 256 +#define RC4KEYLEN 16 + +struct rc4_ctx { + u_int8_t x, y; + u_int8_t state[RC4STATE]; +}; + +void rc4_keysetup(struct rc4_ctx *, u_char *, u_int32_t); +void rc4_crypt(struct rc4_ctx *, u_char *, u_char *, u_int32_t); |