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author | Przemyslaw Marczak <p.marczak@samsung.com> | 2014-04-02 08:20:04 (GMT) |
---|---|---|
committer | Tom Rini <trini@ti.com> | 2014-04-02 20:35:53 (GMT) |
commit | 4e4815feae4d37032a7afce18a4c26074c51f159 (patch) | |
tree | 41f1273b4a7cf133d7dc33aeb0759959bf353286 | |
parent | d718ded056eefb6239bd2e0a57b7f6d99c6e9e4b (diff) | |
download | u-boot-4e4815feae4d37032a7afce18a4c26074c51f159.tar.xz |
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 <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>
-rw-r--r-- | include/config_fallbacks.h | 14 | ||||
-rw-r--r-- | include/uuid.h | 22 | ||||
-rw-r--r-- | lib/Makefile | 3 | ||||
-rw-r--r-- | lib/uuid.c | 66 |
4 files changed, 100 insertions, 5 deletions
diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h index d8339b2..c6b20fd 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 e8feeed..93027c1 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 diff --git a/lib/Makefile b/lib/Makefile index d7ff7ca..27e4f78 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -60,8 +60,7 @@ obj-$(CONFIG_REGEX) += slre.o obj-y += string.o obj-y += time.o obj-$(CONFIG_TRACE) += trace.o -obj-$(CONFIG_BOOTP_PXE) += uuid.o -obj-$(CONFIG_PARTITION_UUIDS) += uuid.o +obj-$(CONFIG_LIB_UUID) += uuid.o obj-y += vsprintf.o obj-$(CONFIG_LIB_RAND) += rand.o @@ -14,8 +14,22 @@ /* * UUID - Universally Unique IDentifier - 128 bits unique number. * There are 5 versions and one variant of UUID defined by RFC4122 - * specification. Depends on version uuid number base on a time, - * host name, MAC address or random data. + * specification. A UUID contains a set of fields. The set varies + * depending on the version of the UUID, as shown below: + * - time, MAC address(v1), + * - user ID(v2), + * - MD5 of name or URL(v3), + * - random data(v4), + * - SHA-1 of name or URL(v5), + * + * Layout of UUID: + * timestamp - 60-bit: time_low, time_mid, time_hi_and_version + * version - 4 bit (bit 4 through 7 of the time_hi_and_version) + * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low + * variant: - bit 6 and 7 of clock_seq_hi_and_reserved + * node - 48 bit + * + * source: https://www.ietf.org/rfc/rfc4122.txt * * UUID binary format (16 bytes): * @@ -149,3 +163,51 @@ void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format) } } } + +/* + * gen_rand_uuid() - this function generates a random binary UUID version 4. + * In this version all fields beside 4 bits of version and + * 2 bits of variant are randomly generated. + * + * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian. +*/ +#ifdef CONFIG_RANDOM_UUID +void gen_rand_uuid(unsigned char *uuid_bin) +{ + struct uuid uuid; + unsigned int *ptr = (unsigned int *)&uuid; + int i; + + /* Set all fields randomly */ + for (i = 0; i < sizeof(struct uuid) / sizeof(*ptr); i++) + *(ptr + i) = cpu_to_be32(rand()); + + clrsetbits_be16(&uuid.time_hi_and_version, + UUID_VERSION_MASK, + UUID_VERSION << UUID_VERSION_SHIFT); + + clrsetbits_8(&uuid.clock_seq_hi_and_reserved, + UUID_VARIANT_MASK, + UUID_VARIANT << UUID_VARIANT_SHIFT); + + memcpy(uuid_bin, &uuid, sizeof(struct uuid)); +} + +/* + * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string + * formats UUID or GUID. + * + * @param uuid_str - pointer to allocated array [37B]. + * @param - uuid output type: UUID - 0, GUID - 1 + */ +void gen_rand_uuid_str(char *uuid_str, int str_format) +{ + unsigned char uuid_bin[UUID_BIN_LEN]; + + /* Generate UUID (big endian) */ + gen_rand_uuid(uuid_bin); + + /* Convert UUID bin to UUID or GUID formated STRING */ + uuid_bin_to_str(uuid_bin, uuid_str, str_format); +} +#endif |