diff options
Diffstat (limited to 'lib/sha1.c')
| -rw-r--r-- | lib/sha1.c | 31 |
1 files changed, 31 insertions, 0 deletions
@@ -36,6 +36,7 @@ */ #include <string.h> +#include <stdio.h> #include "sha1.h" /* @@ -420,3 +421,33 @@ void sha1_hmac(const char *key_, size_t key_len, const char *payload, size_t pay sha1_append( &sha1, hash, sha1_hash_size ); sha1_finish( &sha1, Message_Digest ); } + +/* I think this follows the scheme described on: + http://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_.28random.29 + My random data comes from a SHA1 generator but hey, it's random enough for + me, and RFC 4122 looks way more complicated than I need this to be. + + Returns a value that must be free()d. */ +char *sha1_random_uuid( sha1_state_t * context ) +{ + uint8_t dig[sha1_hash_size]; + char *ret = g_new0( char, 40 ); /* 36 chars + \0 */ + int i, p; + + sha1_finish(context, dig); + for( p = i = 0; i < 16; i ++ ) + { + if( i == 4 || i == 6 || i == 8 || i == 10 ) + ret[p++] = '-'; + if( i == 6 ) + dig[i] = ( dig[i] & 0x0f ) | 0x40; + if( i == 8 ) + dig[i] = ( dig[i] & 0x30 ) | 0x80; + + sprintf( ret + p, "%02x", dig[i] ); + p += 2; + } + ret[p] = '\0'; + + return ret; +} |