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Add user-callable SHA-2 functions

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Add the user-callable functions sha224, sha256, sha384, sha512.  We
already had these in the C code to support SCRAM, but there was no test
coverage outside of the SCRAM tests.  Adding these as user-callable
functions allows writing some tests.  Also, we have a user-callable md5
function but no more modern alternative, which led to wide use of md5 as
a general-purpose hash function, which leads to occasional complaints
about using md5.

Also mark the existing md5 functions as leak-proof.

Reviewed-by: Michael Paquier <michael@paquier.xyz>
This commit is contained in:
Peter Eisentraut
2018-02-06 21:46:46 -05:00
parent edd44738bc
commit 10cfce34c0
8 changed files with 328 additions and 52 deletions
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48
src/backend/utils/adt/varlena.c
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@ -22,7 +22,6 @@
#include "catalog/pg_collation.h"
#include "catalog/pg_type.h"
#include "common/int.h"
#include "common/md5.h"
#include "lib/hyperloglog.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
@ -4564,53 +4563,6 @@ to_hex64(PG_FUNCTION_ARGS)
PG_RETURN_TEXT_P(cstring_to_text(ptr));
}
/*
* Create an md5 hash of a text string and return it as hex
*
* md5 produces a 16 byte (128 bit) hash; double it for hex
*/
#define MD5_HASH_LEN 32
Datum
md5_text(PG_FUNCTION_ARGS)
{
text *in_text = PG_GETARG_TEXT_PP(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
/* Calculate the length of the buffer using varlena metadata */
len = VARSIZE_ANY_EXHDR(in_text);
/* get the hash result */
if (pg_md5_hash(VARDATA_ANY(in_text), len, hexsum) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
/* convert to text and return it */
PG_RETURN_TEXT_P(cstring_to_text(hexsum));
}
/*
* Create an md5 hash of a bytea field and return it as a hex string:
* 16-byte md5 digest is represented in 32 hex characters.
*/
Datum
md5_bytea(PG_FUNCTION_ARGS)
{
bytea *in = PG_GETARG_BYTEA_PP(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
len = VARSIZE_ANY_EXHDR(in);
if (pg_md5_hash(VARDATA_ANY(in), len, hexsum) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
PG_RETURN_TEXT_P(cstring_to_text(hexsum));
}
/*
* Return the size of a datum, possibly compressed
*