From 4e4815feae4d37032a7afce18a4c26074c51f159 Mon Sep 17 00:00:00 2001 From: Przemyslaw Marczak Date: Wed, 2 Apr 2014 10:20:04 +0200 Subject: lib: uuid: add functions to generate UUID version 4 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 Cc: Stephen Warren Cc: Lukasz Majewski [trini: Add CONFIG_EFI_PARTITION to fallbacks] Signed-off-by: Tom Rini --- include/config_fallbacks.h | 14 ++++++++++++++ include/uuid.h | 22 +++++++++++++++++++++- 2 files changed, 35 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h index d8339b26cca..c6b20fd297f 100644 --- a/include/config_fallbacks.h +++ b/include/config_fallbacks.h @@ -55,6 +55,20 @@ #define HAVE_BLOCK_DEVICE #endif +#if (defined(CONFIG_PARTITION_UUIDS) || \ + defined(CONFIG_EFI_PARTITION) || \ + defined(CONFIG_RANDOM_UUID) || \ + defined(CONFIG_BOOTP_PXE)) && \ + !defined(CONFIG_LIB_UUID) +#define CONFIG_LIB_UUID +#endif + +#if defined(CONFIG_RANDOM_UUID) && \ + !defined(CONFIG_LIB_RAND) && \ + !defined(CONFIG_LIB_HW_RAND) +#define CONFIG_LIB_RAND +#endif + #ifndef CONFIG_SYS_PROMPT #define CONFIG_SYS_PROMPT "=> " #endif diff --git a/include/uuid.h b/include/uuid.h index e8feeed7a54..93027c1b286 100644 --- a/include/uuid.h +++ b/include/uuid.h @@ -7,15 +7,35 @@ #ifndef __UUID_H__ #define __UUID_H__ +/* This is structure is in big-endian */ +struct uuid { + unsigned int time_low; + unsigned short time_mid; + unsigned short time_hi_and_version; + unsigned char clock_seq_hi_and_reserved; + unsigned char clock_seq_low; + unsigned char node[6]; +} __packed; + enum { UUID_STR_FORMAT_STD, UUID_STR_FORMAT_GUID }; #define UUID_STR_LEN 36 -#define UUID_BIN_LEN 16 +#define UUID_BIN_LEN sizeof(struct uuid) + +#define UUID_VERSION_MASK 0xf000 +#define UUID_VERSION_SHIFT 12 +#define UUID_VERSION 0x4 + +#define UUID_VARIANT_MASK 0xc0 +#define UUID_VARIANT_SHIFT 7 +#define UUID_VARIANT 0x1 int uuid_str_valid(const char *uuid); int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format); void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format); +void gen_rand_uuid(unsigned char *uuid_bin); +void gen_rand_uuid_str(char *uuid_str, int str_format); #endif -- cgit v1.3.1