diff options
Diffstat (limited to 'node/Packet.cpp')
| -rw-r--r-- | node/Packet.cpp | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/node/Packet.cpp b/node/Packet.cpp index 82a5d7ea..80ea2de7 100644 --- a/node/Packet.cpp +++ b/node/Packet.cpp @@ -2025,14 +2025,9 @@ bool Packet::dearmor(const void *key) void Packet::cryptField(const void *key,unsigned int start,unsigned int len) { - unsigned char mangledKey[32]; - unsigned char macKey[32]; - _salsa20MangleKey((const unsigned char *)key,mangledKey); - mangledKey[0] ^= 0x7f; - mangledKey[1] ^= ((start >> 8) & 0xff); - mangledKey[2] ^= (start & 0xff); // slightly alter key for this use case as an added guard against key stream reuse - Salsa20 s20(mangledKey,256,field(ZT_PACKET_IDX_IV,8)); - s20.crypt12(ZERO_KEY,macKey,sizeof(macKey)); // discard the first 32 bytes of key stream (the ones use for MAC in armor()) as a precaution + unsigned char discard[32]; + Salsa20 s20(key,256,field(ZT_PACKET_IDX_IV,8)); + s20.crypt12(ZERO_KEY,discard,sizeof(discard)); // discard the first 32 bytes of key stream (the ones use for MAC in armor()) as a precaution unsigned char *const ptr = field(start,len); s20.crypt12(ptr,ptr,len); } |