diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 1 | ||||
| -rw-r--r-- | lib/uuid.c | 59 |
2 files changed, 53 insertions, 7 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index 86919410cd7..1dd4f271595 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -73,6 +73,7 @@ config HAVE_PRIVATE_LIBGCC config LIB_UUID bool + select SHA1 config RANDOM_UUID bool "GPT Random UUID generation" diff --git a/lib/uuid.c b/lib/uuid.c index dfa2320ba26..c9dfdf007a1 100644 --- a/lib/uuid.c +++ b/lib/uuid.c @@ -22,6 +22,7 @@ #include <malloc.h> #include <dm/uclass.h> #include <rng.h> +#include <u-boot/sha1.h> int uuid_str_valid(const char *uuid) { @@ -369,6 +370,56 @@ void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str, } } +static void configure_uuid(struct uuid *uuid, unsigned char version) +{ + uint16_t tmp; + + /* Configure variant/version bits */ + tmp = be16_to_cpu(uuid->time_hi_and_version); + tmp = (tmp & ~UUID_VERSION_MASK) | (version << UUID_VERSION_SHIFT); + uuid->time_hi_and_version = cpu_to_be16(tmp); + + uuid->clock_seq_hi_and_reserved &= ~UUID_VARIANT_MASK; + uuid->clock_seq_hi_and_reserved |= (UUID_VARIANT << UUID_VARIANT_SHIFT); +} + +void gen_v5_guid(const struct uuid *namespace, struct efi_guid *guid, ...) +{ + sha1_context ctx; + va_list args; + const uint8_t *data; + uint32_t *tmp32; + uint16_t *tmp16; + uint8_t hash[SHA1_SUM_LEN]; + + sha1_starts(&ctx); + /* Hash the namespace UUID as salt */ + sha1_update(&ctx, (unsigned char *)namespace, UUID_BIN_LEN); + va_start(args, guid); + + while ((data = va_arg(args, const uint8_t *))) { + unsigned int len = va_arg(args, size_t); + + sha1_update(&ctx, data, len); + } + + va_end(args); + sha1_finish(&ctx, hash); + + /* Truncate the hash into output UUID, it is already big endian */ + memcpy(guid, hash, sizeof(*guid)); + + configure_uuid((struct uuid *)guid, 5); + + /* Make little endian */ + tmp32 = (uint32_t *)&guid->b[0]; + *tmp32 = cpu_to_le32(be32_to_cpu(*tmp32)); + tmp16 = (uint16_t *)&guid->b[4]; + *tmp16 = cpu_to_le16(be16_to_cpu(*tmp16)); + tmp16 = (uint16_t *)&guid->b[6]; + *tmp16 = cpu_to_le16(be16_to_cpu(*tmp16)); +} + #if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID) void gen_rand_uuid(unsigned char *uuid_bin) { @@ -395,13 +446,7 @@ void gen_rand_uuid(unsigned char *uuid_bin) for (i = 0; i < 4; i++) ptr[i] = 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); + configure_uuid(uuid, UUID_VERSION); memcpy(uuid_bin, uuid, 16); } |