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x25519: demand RNG is successful 

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-02-05 00:49:18 +01:00
parent 3c61db3a21
commit f7a31ca7bb
1 changed files with 2 additions and 1 deletions
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3
WireGuard/WireGuard/Crypto/x25519.c
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@ -7,6 +7,7 @@
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <CommonCrypto/CommonRandom.h>
#include "x25519.h"
@ -171,7 +172,7 @@ void curve25519_derive_public_key(uint8_t public_key[32], const uint8_t private_
void curve25519_generate_private_key(uint8_t private_key[32])
{
CCRandomGenerateBytes(private_key, 32);
assert(CCRandomGenerateBytes(private_key, 32) == kCCSuccess);
private_key[31] = (private_key[31] & 127) | 64;
private_key[0] &= 248;
}