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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string.h>
#ifdef USE_MINGW
#include <winsock2.h>
#else
#include <arpa/inet.h>
#endif
#include "ext4_utils.h"
#include "sha1.h"
#include "uuid.h"
/* Definition from RFC-4122 */
struct uuid {
u32 time_low;
u16 time_mid;
u16 time_hi_and_version;
u8 clk_seq_hi_res;
u8 clk_seq_low;
u16 node0_1;
u32 node2_5;
};
static void sha1_hash(const char *namespace, const char *name,
unsigned char sha1[SHA1_DIGEST_LENGTH])
{
SHA1_CTX ctx;
SHA1Init(&ctx);
SHA1Update(&ctx, (const u8*)namespace, strlen(namespace));
SHA1Update(&ctx, (const u8*)name, strlen(name));
SHA1Final(sha1, &ctx);
}
void generate_uuid(const char *namespace, const char *name, u8 result[16])
{
unsigned char sha1[SHA1_DIGEST_LENGTH];
struct uuid *uuid = (struct uuid *)result;
sha1_hash(namespace, name, (unsigned char*)sha1);
memcpy(uuid, sha1, sizeof(struct uuid));
uuid->time_low = ntohl(uuid->time_low);
uuid->time_mid = ntohs(uuid->time_mid);
uuid->time_hi_and_version = ntohs(uuid->time_hi_and_version);
uuid->time_hi_and_version &= 0x0FFF;
uuid->time_hi_and_version |= (5 << 12);
uuid->clk_seq_hi_res &= ~(1 << 6);
uuid->clk_seq_hi_res |= 1 << 7;
}
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