r9421: Move arcfour code into it's own file, in lib/crypto.

Andrew Bartlett
(This used to be commit ca6cf462708810637544d4b4bef0f404fb89a002)

3 files changed, 99 insertions, 1 deletions

diff --git a/source4/lib/crypto/arcfour.c b/source4/lib/crypto/arcfour.c
new file mode 100644
index 0000000000..cc5d2df567
--- /dev/null
+++ b/source4/lib/crypto/arcfour.c
@@ -0,0 +1,92 @@
+/* 
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "lib/crypto/crypto.h"
+
+/* initialise the arcfour sbox with key */
+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 */
+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
+*/
+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
+*/
+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);
+}
+
+
diff --git a/source4/lib/crypto/crypto.h b/source4/lib/crypto/crypto.h
index 8cf4b21aae..19457f60dc 100644
--- a/source4/lib/crypto/crypto.h
+++ b/source4/lib/crypto/crypto.h
@@ -28,3 +28,9 @@ struct arcfour_state {
 	uint8_t index_i;
 	uint8_t index_j;
 };
+
+void arcfour_init(struct arcfour_state *state, const DATA_BLOB *key);
+void arcfour_crypt_sbox(struct arcfour_state *state, uint8_t *data, int len);
+void arcfour_crypt_blob(uint8_t *data, int len, const DATA_BLOB *key);
+void arcfour_crypt(uint8_t *data, const uint8_t keystr[16], int len);
+
diff --git a/source4/lib/crypto/hmacmd5.h b/source4/lib/crypto/hmacmd5.h
index fb6692a05f..6ee195875e 100644
--- a/source4/lib/crypto/hmacmd5.h
+++ b/source4/lib/crypto/hmacmd5.h
@@ -1,6 +1,6 @@
 /* 
    Unix SMB/CIFS implementation.
-   Interface header: Scheduler service
+   Interface header:    HMAC MD5 code
    Copyright (C) Luke Kenneth Casson Leighton 1996-1999
    Copyright (C) Andrew Tridgell 1992-1999