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authorLibravatarLibravatar daurnimator <quae@daurnimator.com> 2017-12-18 15:31:39 +1100
committerLibravatarLibravatar daurnimator <quae@daurnimator.com> 2017-12-18 16:04:58 +1100
commit71225b77a843d3eeb6bf2fe5123c1a192f6fdabb (patch)
treeb49f253bd5d173b5878b32786c0928489ac0c080 /src
parent5be1b44a6a60f32c660cc4ee09d60e676cd8c81a (diff)
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src/openssl.c: Add bn:mod_exp() function
Diffstat (limited to 'src')
-rw-r--r--src/openssl.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/openssl.c b/src/openssl.c
index 5ff80fe..ba6e9b6 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -2798,6 +2798,20 @@ static void bn_prepbop(lua_State *L, BIGNUM **r, BIGNUM **a, BIGNUM **b, _Bool c
} /* bn_prepbop() */
+/* prepare numbers at top of stack for ternary operation, and push result object onto stack */
+static void bn_preptop(lua_State *L, BIGNUM **r, BIGNUM **a, BIGNUM **b, BIGNUM **c) {
+ _Bool a_lvalue, b_lvalue, c_lvalue;
+
+ *a = checkbig(L, 1, &a_lvalue);
+ *b = checkbig(L, 2, &b_lvalue);
+ *c = checkbig(L, 3, &c_lvalue);
+
+ bn_push(L);
+
+ *r = *(BIGNUM **)lua_touserdata(L, -1);
+} /* bn_preptop() */
+
+
static int ctx__gc(lua_State *L) {
BN_CTX **ctx = lua_touserdata(L, 1);
@@ -2959,6 +2973,19 @@ static int bn__pow(lua_State *L) {
} /* bn__pow() */
+static int bn_mod_exp(lua_State *L) {
+ BIGNUM *r, *a, *b, *c;
+
+ lua_settop(L, 3);
+ bn_preptop(L, &r, &a, &b, &c);
+
+ if (!BN_mod_exp(r, a, b, c, getctx(L)))
+ return auxL_error(L, auxL_EOPENSSL, "bignum:mod_exp");
+
+ return 1;
+} /* bn_mod_exp() */
+
+
static int bn_gcd(lua_State *L) {
BIGNUM *r, *a, *b;
@@ -3153,6 +3180,7 @@ static const auxL_Reg bn_methods[] = {
{ "mod", &bn__mod },
{ "nnmod", &bn_nnmod },
{ "exp", &bn__pow },
+ { "mod_exp", &bn_mod_exp },
{ "gcd", &bn_gcd },
{ "lshift", &bn__shl },
{ "rshift", &bn__shr },