warp-vpn

simple point to point tunnel
git clone git://git.2f30.org/warp-vpn.git
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commit f77cdbc47350a36c0f1c5e5fd86f0aa71fa4c0b2
parent 959abd7829076e77c211a7c554ccb8d2b2f483a5
Author: sin <sin@2f30.org>
Date:   Thu Mar 24 18:07:43 +0000

randomize padding when encrypting

Diffstat:
stun.c | 9+++++++++
1 file changed, 9 insertions(+), 0 deletions(-)
diff --git a/stun.c b/stun.c @@ -117,6 +117,12 @@ padto(int len, int blocksize) } int +padlen(int len, int blocksize) +{ + return padto(len, blocksize) - len; +} + +int prepkey(unsigned char *pw, int pwlen) { int ret, nrounds = 5; @@ -356,6 +362,9 @@ writenet(int fd, unsigned char *buf, int len) { unsigned char encbuf[MTU + AES_BLOCK_SIZE + HDRLEN]; + if (padlen(len, AES_BLOCK_SIZE) > 0) + arc4random_buf(&encbuf[HDRLEN + len], + padlen(len, AES_BLOCK_SIZE)); aesenc(&enc, &encbuf[HDRLEN], buf, padto(len, AES_BLOCK_SIZE)); pack16(encbuf, len); len = padto(len, AES_BLOCK_SIZE) + HDRLEN;