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for Retry integrity protection, use values that can be derived from AEAD API #3365

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merged 2 commits into from Jan 21, 2020
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for Retry integrity protection, use values that can be derived from AEAD API #3365

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for Retry integrity protection, use values that can be derived from A…
kazuho Jan 19, 2020
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refer to Packet Protection Keys
kazuho Jan 20, 2020
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8 changes: 6 additions & 2 deletions draft-ietf-quic-tls.md
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Expand Up @@ -1223,12 +1223,16 @@ off-path attackers' ability to send valid Retry packets.
The Retry Integrity Tag is a 128-bit field that is computed as the output of
AEAD_AES_128_GCM {{!AEAD=RFC5116}} used with the following inputs:

- The secret key, K, is 128 bits equal to 0xf5ed4642e0e4c8d878bbbc8a828821c9.
- The nonce, N, is 96 bits all set to zero.
- The secret key, K, is 128 bits equal to 0x4d32ecdb2a2133c841e4043df27d4430.
- The nonce, N, is 96 bits equal to 0x4d1611d05513a552c587d575.
- The plaintext, P, is empty.
- The associated data, A, is the contents of the Retry Pseudo-Packet, as
illustrated in {{retry-pseudo}}:

The secret key and the nonce are values derived by calling HKDF-Expand-Label
using 0x656e61e336ae9417f7f0edd8d78d461e2aa7084aba7a14c1e9f726d55709169a as the
secret, with labels being "quic key" and "quic iv" ({{protection-keys}}).

~~~
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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