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-rw-r--r--lib/crypto/arcfour.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/crypto/arcfour.c b/lib/crypto/arcfour.c
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+++ b/lib/crypto/arcfour.c
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+/*
+ Unix SMB/CIFS implementation.
+
+ An implementation of the arcfour algorithm
+
+ Copyright (C) Andrew Tridgell 1998
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "../lib/crypto/arcfour.h"
+
+/* initialise the arcfour sbox with key */
+_PUBLIC_ void arcfour_init(struct arcfour_state *state, const DATA_BLOB *key)
+{
+ int ind;
+ uint8_t j = 0;
+ for (ind = 0; ind < sizeof(state->sbox); ind++) {
+ state->sbox[ind] = (uint8_t)ind;
+ }
+
+ for (ind = 0; ind < sizeof(state->sbox); ind++) {
+ uint8_t tc;
+
+ j += (state->sbox[ind] + key->data[ind%key->length]);
+
+ tc = state->sbox[ind];
+ state->sbox[ind] = state->sbox[j];
+ state->sbox[j] = tc;
+ }
+ state->index_i = 0;
+ state->index_j = 0;
+}
+
+/* crypt the data with arcfour */
+_PUBLIC_ void arcfour_crypt_sbox(struct arcfour_state *state, uint8_t *data, int len)
+{
+ int ind;
+
+ for (ind = 0; ind < len; ind++) {
+ uint8_t tc;
+ uint8_t t;
+
+ state->index_i++;
+ state->index_j += state->sbox[state->index_i];
+
+ tc = state->sbox[state->index_i];
+ state->sbox[state->index_i] = state->sbox[state->index_j];
+ state->sbox[state->index_j] = tc;
+
+ t = state->sbox[state->index_i] + state->sbox[state->index_j];
+ data[ind] = data[ind] ^ state->sbox[t];
+ }
+}
+
+/*
+ arcfour encryption with a blob key
+*/
+_PUBLIC_ void arcfour_crypt_blob(uint8_t *data, int len, const DATA_BLOB *key)
+{
+ struct arcfour_state state;
+ arcfour_init(&state, key);
+ arcfour_crypt_sbox(&state, data, len);
+}
+
+/*
+ a variant that assumes a 16 byte key. This should be removed
+ when the last user is gone
+*/
+_PUBLIC_ void arcfour_crypt(uint8_t *data, const uint8_t keystr[16], int len)
+{
+ DATA_BLOB key = data_blob(keystr, 16);
+
+ arcfour_crypt_blob(data, len, &key);
+
+ data_blob_free(&key);
+}
+
+