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4e4815feae
This patch adds support to generate UUID (Universally Unique Identifier) in version 4 based on RFC4122, which is randomly. Source: https://www.ietf.org/rfc/rfc4122.txt Changes: - new configs: - CONFIG_LIB_UUID for compile lib/uuid.c - CONFIG_RANDOM_UUID for functions gen_rand_uuid() and gen_rand_uuid_str() - add configs dependency to include/config_fallbacks.h for lib uuid. lib/uuid.c: - add gen_rand_uuid() - this function writes 16 bytes len binary representation of UUID v4 to the memory at given address. - add gen_rand_uuid_str() - this function writes 37 bytes len hexadecimal ASCII string representation of UUID v4 to the memory at given address. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Cc: Stephen Warren <swarren@nvidia.com> Cc: Lukasz Majewski <l.majewski@samsung.com> [trini: Add CONFIG_EFI_PARTITION to fallbacks] Signed-off-by: Tom Rini <trini@ti.com>
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
/*
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* Copyright (C) 2014 Samsung Electronics
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* Przemyslaw Marczak <p.marczak@samsung.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __UUID_H__
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#define __UUID_H__
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/* This is structure is in big-endian */
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struct uuid {
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unsigned int time_low;
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unsigned short time_mid;
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unsigned short time_hi_and_version;
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unsigned char clock_seq_hi_and_reserved;
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unsigned char clock_seq_low;
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unsigned char node[6];
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} __packed;
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enum {
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UUID_STR_FORMAT_STD,
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UUID_STR_FORMAT_GUID
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};
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#define UUID_STR_LEN 36
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#define UUID_BIN_LEN sizeof(struct uuid)
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#define UUID_VERSION_MASK 0xf000
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#define UUID_VERSION_SHIFT 12
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#define UUID_VERSION 0x4
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#define UUID_VARIANT_MASK 0xc0
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#define UUID_VARIANT_SHIFT 7
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#define UUID_VARIANT 0x1
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int uuid_str_valid(const char *uuid);
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int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format);
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void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format);
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void gen_rand_uuid(unsigned char *uuid_bin);
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void gen_rand_uuid_str(char *uuid_str, int str_format);
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#endif
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