Tweak how we do crypto of the masked portions of HELLO just to be more "boring" in the DJB sense.
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2 changed files with 11 additions and 7 deletions
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@ -2026,9 +2026,11 @@ bool Packet::dearmor(const void *key)
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void Packet::cryptField(const void *key,unsigned int start,unsigned int len)
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{
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unsigned char mangledKey[32];
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uint64_t iv = Utils::hton((uint64_t)start ^ at<uint64_t>(ZT_PACKET_IDX_IV));
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unsigned char macKey[32];
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_salsa20MangleKey((const unsigned char *)key,mangledKey);
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Salsa20 s20(mangledKey,256,&iv);
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mangledKey[0] ^= 1; // slightly alter key for this use case as an added guard against key stream reuse
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Salsa20 s20(mangledKey,256,field(ZT_PACKET_IDX_IV,8));
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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
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unsigned char *const ptr = field(start,len);
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s20.crypt12(ptr,ptr,len);
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}
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