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/*-------------------------------------------------------------------------
*
* cryptohashfuncs.c
* Cryptographic hash functions
*
* Portions Copyright (c) 2018-2021, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/backend/utils/adt/cryptohashfuncs.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "common/cryptohash.h"
#include "common/md5.h"
#include "common/sha2.h"
#include "utils/builtins.h"
/*
* MD5
*/
/* MD5 produces a 16 byte (128 bit) hash; double it for hex */
#define MD5_HASH_LEN 32
/*
* Create an MD5 hash of a text value and return it as hex string.
*/
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 value and return it as a hex string.
*/
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));
}
/*
* Internal routine to compute a cryptohash with the given bytea input.
*/
static inline bytea *
cryptohash_internal(pg_cryptohash_type type, bytea *input)
{
const uint8 *data;
const char *typestr = NULL;
int digest_len = 0;
size_t len;
pg_cryptohash_ctx *ctx;
bytea *result;
switch (type)
{
case PG_SHA224:
typestr = "SHA224";
digest_len = PG_SHA224_DIGEST_LENGTH;
break;
case PG_SHA256:
typestr = "SHA256";
digest_len = PG_SHA256_DIGEST_LENGTH;
break;
case PG_SHA384:
typestr = "SHA384";
digest_len = PG_SHA384_DIGEST_LENGTH;
break;
case PG_SHA512:
typestr = "SHA512";
digest_len = PG_SHA512_DIGEST_LENGTH;
break;
case PG_MD5:
case PG_SHA1:
elog(ERROR, "unsupported cryptohash type %d", type);
break;
}
result = palloc0(digest_len + VARHDRSZ);
len = VARSIZE_ANY_EXHDR(input);
data = (unsigned char *) VARDATA_ANY(input);
ctx = pg_cryptohash_create(type);
if (pg_cryptohash_init(ctx) < 0)
elog(ERROR, "could not initialize %s context", typestr);
if (pg_cryptohash_update(ctx, data, len) < 0)
elog(ERROR, "could not update %s context", typestr);
if (pg_cryptohash_final(ctx, (unsigned char *) VARDATA(result),
digest_len) < 0)
elog(ERROR, "could not finalize %s context", typestr);
pg_cryptohash_free(ctx);
SET_VARSIZE(result, digest_len + VARHDRSZ);
return result;
}
/*
* SHA-2 variants
*/
Datum
sha224_bytea(PG_FUNCTION_ARGS)
{
bytea *result = cryptohash_internal(PG_SHA224, PG_GETARG_BYTEA_PP(0));
PG_RETURN_BYTEA_P(result);
}
Datum
sha256_bytea(PG_FUNCTION_ARGS)
{
bytea *result = cryptohash_internal(PG_SHA256, PG_GETARG_BYTEA_PP(0));
PG_RETURN_BYTEA_P(result);
}
Datum
sha384_bytea(PG_FUNCTION_ARGS)
{
bytea *result = cryptohash_internal(PG_SHA384, PG_GETARG_BYTEA_PP(0));
PG_RETURN_BYTEA_P(result);
}
Datum
sha512_bytea(PG_FUNCTION_ARGS)
{
bytea *result = cryptohash_internal(PG_SHA512, PG_GETARG_BYTEA_PP(0));
PG_RETURN_BYTEA_P(result);
}
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