62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <arpa/inet.h>
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#include "ext4_utils.h"
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#include "sha1.h"
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#include "uuid.h"
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/* Definition from RFC-4122 */
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struct uuid {
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u32 time_low;
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u16 time_mid;
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u16 time_hi_and_version;
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u8 clk_seq_hi_res;
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u8 clk_seq_low;
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u16 node0_1;
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u32 node2_5;
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};
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static void sha1_hash(const char *namespace, const char *name,
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unsigned char sha1[SHA1_DIGEST_LENGTH])
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{
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SHA1_CTX ctx;
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SHA1Init(&ctx);
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SHA1Update(&ctx, (const u8*)namespace, strlen(namespace));
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SHA1Update(&ctx, (const u8*)name, strlen(name));
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SHA1Final(sha1, &ctx);
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}
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void generate_uuid(const char *namespace, const char *name, u8 result[16])
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{
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unsigned char sha1[SHA1_DIGEST_LENGTH];
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struct uuid *uuid = (struct uuid *)result;
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sha1_hash(namespace, name, (unsigned char*)sha1);
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memcpy(uuid, sha1, sizeof(struct uuid));
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uuid->time_low = ntohl(uuid->time_low);
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uuid->time_mid = ntohs(uuid->time_mid);
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uuid->time_hi_and_version = ntohs(uuid->time_hi_and_version);
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uuid->time_hi_and_version &= 0x0FFF;
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uuid->time_hi_and_version |= (5 << 12);
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uuid->clk_seq_hi_res &= ~(1 << 6);
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uuid->clk_seq_hi_res |= 1 << 7;
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}
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