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 --- lib/uuid.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 64 insertions(+), 2 deletions(-) (limited to 'lib/uuid.c') diff --git a/lib/uuid.c b/lib/uuid.c index 8db865fc69..44d0c932ac 100644 --- a/lib/uuid.c +++ b/lib/uuid.c @@ -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 -- cgit v1.2.1