2 * Copyright (C) 2010 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <arpa/inet.h>
21 #include "ext4_utils.h"
25 /* Definition from RFC-4122 */
29 u16 time_hi_and_version;
36 static void sha1_hash(const char *namespace, const char *name,
37 unsigned char sha1[SHA1_DIGEST_LENGTH])
41 SHA1Update(&ctx, (const u8*)namespace, strlen(namespace));
42 SHA1Update(&ctx, (const u8*)name, strlen(name));
43 SHA1Final(sha1, &ctx);
46 void generate_uuid(const char *namespace, const char *name, u8 result[16])
48 unsigned char sha1[SHA1_DIGEST_LENGTH];
49 struct uuid *uuid = (struct uuid *)result;
51 sha1_hash(namespace, name, (unsigned char*)sha1);
52 memcpy(uuid, sha1, sizeof(struct uuid));
54 uuid->time_low = ntohl(uuid->time_low);
55 uuid->time_mid = ntohs(uuid->time_mid);
56 uuid->time_hi_and_version = ntohs(uuid->time_hi_and_version);
57 uuid->time_hi_and_version &= 0x0FFF;
58 uuid->time_hi_and_version |= (5 << 12);
59 uuid->clk_seq_hi_res &= ~(1 << 6);
60 uuid->clk_seq_hi_res |= 1 << 7;