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Code Issues 1 Releases Wiki Activity

Allow disabling keyed hash function (prf) in conf

Browse Source 
In some cases, one might want to disable what is currently
SipHash for speed / better security mechansims. For example, using
red black trees for caches rather than hash tables.
This commit is contained in:
Calvin Rose 2020-01-16 21:06:03 -06:00
parent 3d117804dd
commit 23c7c3bf1c
5 changed files with 20 additions and 1 deletions
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1
meson.build
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@ -62,6 +62,7 @@ conf.set('JANET_NO_PEG', not get_option('peg'))
conf.set('JANET_REDUCED_OS', get_option('reduced_os'))
conf.set('JANET_NO_TYPED_ARRAY', not get_option('typed_array'))
conf.set('JANET_NO_INT_TYPES', not get_option('int_types'))
conf.set('JANET_NO_PRF', not get_option('prf'))
conf.set('JANET_RECURSION_GUARD', get_option('recursion_guard'))
conf.set('JANET_MAX_PROTO_DEPTH', get_option('max_proto_depth'))
conf.set('JANET_MAX_MACRO_EXPAND', get_option('max_macro_expand'))

1
meson_options.txt
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@ -10,6 +10,7 @@ option('assembler', type : 'boolean', value : true)
option('peg', type : 'boolean', value : true)
option('typed_array', type : 'boolean', value : true)
option('int_types', type : 'boolean', value : true)
option('prf', type : 'boolean', value : true)
option('recursion_guard', type : 'integer', min : 10, max : 8000, value : 1024)
option('max_proto_depth', type : 'integer', min : 10, max : 8000, value : 200)

1
src/conf/janetconf.h
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@ -51,6 +51,7 @@
/* #define JANET_NO_PEG */
/* #define JANET_NO_TYPED_ARRAY */
/* #define JANET_NO_INT_TYPES */
/* #define JANET_NO_PRF */
/* #define JANET_OUT_OF_MEMORY do { printf("janet out of memory\n"); exit(1); } while (0) */
/* #define JANET_RECURSION_GUARD 1024 */
/* #define JANET_MAX_PROTO_DEPTH 200 */

14
src/core/util.c
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@ -94,6 +94,18 @@ const char *const janet_status_names[16] = {
"alive"
};
#ifdef JANET_NO_PRF
int32_t janet_string_calchash(const uint8_t *str, int32_t len) {
const uint8_t *end = str + len;
uint32_t hash = 5381;
while (str < end)
hash = (hash << 5) + hash + *str++;
return (int32_t) hash;
}
#else
/*
Public domain siphash implementation sourced from:
@ -202,6 +214,8 @@ int32_t janet_string_calchash(const uint8_t *str, int32_t len) {
return (int32_t)hash;
}
#endif
/* Computes hash of an array of values */
int32_t janet_array_calchash(const Janet *array, int32_t len) {
const Janet *end = array + len;

4
src/include/janet.h
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@ -1302,8 +1302,10 @@ JANET_API int janet_verify(JanetFuncDef *def);
JANET_API JanetBuffer *janet_pretty(JanetBuffer *buffer, int depth, int flags, Janet x);
/* Misc */
JANET_API int janet_equals(Janet x, Janet y);
#ifndef JANET_NO_PRF
JANET_API void janet_init_hash_key(uint8_t key[16]);
#endif
JANET_API int janet_equals(Janet x, Janet y);
JANET_API int32_t janet_hash(Janet x);
JANET_API int janet_compare(Janet x, Janet y);
JANET_API int janet_cstrcmp(JanetString str, const char *other);