protocolshr.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:5k
- /*
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape security libraries.
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
- #include "string.h"
- #include "protocol.h"
- #include "protocolshr.h"
- #include "messages.h"
- /* Forward ref */
- static void encrypt(CMTItem *data);
- static void decrypt(CMTItem *data);
- const char *kPrefix = "Encrypted";
- /* encryption request */
- CMTStatus
- CMT_DoEncryptionRequest(CMTItem *message)
- {
- CMTStatus rv = CMTSuccess;
- EncryptRequestMessage request;
- EncryptReplyMessage reply;
- CMUint32 pLen = strlen(kPrefix);
- /* Initialize */
- request.keyid.data = 0;
- request.data.data = 0;
- reply.item.data = 0;
- /* Decode incoming message */
- rv = CMT_DecodeMessage(EncryptRequestTemplate, &request, message);
- if (rv != CMTSuccess) goto loser; /* Protocol error */
- /* Free incoming message */
- free(message->data);
- message->data = NULL;
- /* "Encrypt" by prefixing the data */
- reply.item.len = request.data.len + pLen;
- reply.item.data = calloc(reply.item.len, 1);
- if (!reply.item.data) {
- rv = CMTFailure;
- goto loser;
- }
- if (pLen) memcpy(reply.item.data, kPrefix, pLen);
- encrypt(&request.data);
- memcpy(&reply.item.data[pLen], request.data.data, request.data.len);
-
- /* Generate response */
- message->type = SSM_SDR_ENCRYPT_REPLY;
- rv = CMT_EncodeMessage(EncryptReplyTemplate, message, &reply);
- if (rv != CMTSuccess) goto loser; /* Unknown error */
- loser:
- if (request.keyid.data) free(request.keyid.data);
- if (request.data.data) free(request.data.data);
- if (request.ctx.data) free(request.ctx.data);
- if (reply.item.data) free(reply.item.data);
- return rv;
- }
- /* decryption request */
- CMTStatus
- CMT_DoDecryptionRequest(CMTItem *message)
- {
- CMTStatus rv = CMTSuccess;
- DecryptRequestMessage request;
- DecryptReplyMessage reply;
- CMUint32 pLen = strlen(kPrefix);
- /* Initialize */
- request.data.data = 0;
- request.ctx.data = 0;
- reply.item.data = 0;
- /* Decode the message */
- rv = CMT_DecodeMessage(DecryptRequestTemplate, &request, message);
- if (rv != CMTSuccess) goto loser;
- /* Free incoming message */
- free(message->data);
- message->data = NULL;
- /* "Decrypt" the message by removing the key */
- if (pLen && memcmp(request.data.data, kPrefix, pLen) != 0) {
- rv = CMTFailure; /* Invalid format */
- goto loser;
- }
- reply.item.len = request.data.len - pLen;
- reply.item.data = calloc(reply.item.len, 1);
- if (!reply.item.data) { rv = CMTFailure; goto loser; }
- memcpy(reply.item.data, &request.data.data[pLen], reply.item.len);
- decrypt(&reply.item);
- /* Create reply message */
- message->type = SSM_SDR_DECRYPT_REPLY;
- rv = CMT_EncodeMessage(DecryptReplyTemplate, message, &reply);
- if (rv != CMTSuccess) goto loser;
- loser:
- if (request.data.data) free(request.data.data);
- if (request.ctx.data) free(request.ctx.data);
- if (reply.item.data) free(reply.item.data);
- return rv;
- }
- /* "encrypt" */
- static unsigned char mask[64] = {
- 0x73, 0x46, 0x1a, 0x05, 0x24, 0x65, 0x43, 0xb4, 0x24, 0xee, 0x79, 0xc1, 0xcc,
- 0x49, 0xc7, 0x27, 0x11, 0x91, 0x2e, 0x8f, 0xaa, 0xf7, 0x62, 0x75, 0x41, 0x7e,
- 0xb2, 0x42, 0xde, 0x1b, 0x42, 0x7b, 0x1f, 0x33, 0x49, 0xca, 0xd1, 0x6a, 0x85,
- 0x05, 0x6c, 0xf9, 0x0e, 0x3e, 0x72, 0x02, 0xf2, 0xd8, 0x9d, 0xa1, 0xb8, 0x6e,
- 0x03, 0x18, 0x3e, 0x82, 0x86, 0x34, 0x1a, 0x61, 0xd9, 0x65, 0xb6, 0x7f
- };
- static void
- encrypt(CMTItem *data)
- {
- unsigned int i, j;
- j = 0;
- for(i = 0;i < data->len;i++)
- {
- data->data[i] ^= mask[j];
- if (++j >= 64) j = 0;
- }
- }
- static void
- decrypt(CMTItem *data)
- {
- encrypt(data);
- }