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DH key exchange can't be 0 , avoid attack

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Cloud Wu
2015-09-18 14:10:12 +08:00
parent 8cc5638f14
commit 00dbf6e996
1 changed files with 17 additions and 3 deletions
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20
lualib-src/lua-crypt.c
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@@ -338,8 +338,13 @@ static int
lrandomkey(lua_State *L) {
char tmp[8];
int i;
char x = 0;
for (i=0;i<8;i++) {
tmp[i] = random() & 0xff;
x ^= tmp[i];
}
if (x==0) {
tmp[0] |= 1; // avoid 0
}
lua_pushlstring(L, tmp, 8);
return 1;
@@ -718,8 +723,13 @@ static int
ldhsecret(lua_State *L) {
uint32_t x[2], y[2];
read64(L, x, y);
uint64_t r = powmodp((uint64_t)x[0] | (uint64_t)x[1]<<32,
(uint64_t)y[0] | (uint64_t)y[1]<<32);
uint64_t xx = (uint64_t)x[0] | (uint64_t)x[1]<<32;
uint64_t yy = (uint64_t)y[0] | (uint64_t)y[1]<<32;
if (xx == 0)
xx = 1;
if (yy == 0)
yy = 1;
uint64_t r = powmodp(xx, yy);
push64(L, r);
@@ -739,7 +749,11 @@ ldhexchange(lua_State *L) {
xx[0] = x[0] | x[1]<<8 | x[2]<<16 | x[3]<<24;
xx[1] = x[4] | x[5]<<8 | x[6]<<16 | x[7]<<24;
uint64_t r = powmodp(5, (uint64_t)xx[0] | (uint64_t)xx[1]<<32);
uint64_t x64 = (uint64_t)xx[0] | (uint64_t)xx[1]<<32;
if (x64 == 0)
x64 = 1;
uint64_t r = powmodp(5, x64);
push64(L, r);
return 1;
}