diff options
Diffstat (limited to 'contrib/pgcrypto/pgcrypto.c')
| -rw-r--r-- | contrib/pgcrypto/pgcrypto.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/contrib/pgcrypto/pgcrypto.c b/contrib/pgcrypto/pgcrypto.c index a441ca77f1..2d446d8cc9 100644 --- a/contrib/pgcrypto/pgcrypto.c +++ b/contrib/pgcrypto/pgcrypto.c @@ -17,7 +17,7 @@ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) @@ -35,6 +35,7 @@ #include "parser/scansup.h" #include "utils/builtins.h" +#include "utils/uuid.h" #include "px.h" #include "px-crypt.h" @@ -443,6 +444,32 @@ pg_random_bytes(PG_FUNCTION_ARGS) PG_RETURN_BYTEA_P(res); } +/* SQL function: gen_random_uuid() returns uuid */ +PG_FUNCTION_INFO_V1(pg_random_uuid); + +Datum +pg_random_uuid(PG_FUNCTION_ARGS) +{ + uint8 *buf = (uint8 *) palloc(UUID_LEN); + int err; + + /* generate random bits */ + err = px_get_pseudo_random_bytes(buf, UUID_LEN); + if (err < 0) + ereport(ERROR, + (errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION), + errmsg("Random generator error: %s", px_strerror(err)))); + + /* + * Set magic numbers for a "version 4" (pseudorandom) UUID, see + * http://tools.ietf.org/html/rfc4122#section-4.4 + */ + buf[6] = (buf[6] & 0x0f) | 0x40; /* "version" field */ + buf[8] = (buf[8] & 0x3f) | 0x80; /* "variant" field */ + + PG_RETURN_UUID_P((pg_uuid_t *) buf); +} + static void * find_provider(text *name, PFN provider_lookup, |