If you want to use sqlite3_randomness to generate a Version 4 UUID according to RFC4122, the following code will can be used: unsigned char uuid_data[16]; /* We'll generate a version 4 UUID as per RFC4122. Start by generating 128 bits of randomness (we will use 122 of them). */ sqlite3_randomness (16,uuid_data); /* Set the two most significant bits (bits 6 and 7) of the clock_seq_hi_and_reserved field to zero and one, respectively. */ uuid_data[8] &= 0x3f; uuid_data[8] |= 0x80; /* Set the four most significant bits (bits 12 through 15) of the time_hi_and_version field to the 4-bit version number from Section 4.1.3 (which is 4). */ uuid_data[6] &= 0x0f; uuid_data[6] |= 0x40;
This assumes that sqlite3_randomness generates sufficiently good random numbers, but it appears to in my tests. Peter _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
