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device: the psk is not a chapoly key

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It's a separate type of key that gets hashed into the chain.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-01-28 14:44:51 +01:00
parent 1b092ce584
commit d4725bc456
2 changed files with 7 additions and 8 deletions
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2
device/noise-protocol.go
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@ -121,7 +121,7 @@ type Handshake struct {
mutex sync.RWMutex mutex sync.RWMutex
hash [blake2s.Size]byte // hash value hash [blake2s.Size]byte // hash value
chainKey [blake2s.Size]byte // chain key chainKey [blake2s.Size]byte // chain key
presharedKey NoiseSymmetricKey // psk presharedKey NoisePresharedKey // psk
localEphemeral NoisePrivateKey // ephemeral secret key localEphemeral NoisePrivateKey // ephemeral secret key
localIndex uint32 // used to clear hash-table localIndex uint32 // used to clear hash-table
remoteIndex uint32 // index for sending remoteIndex uint32 // index for sending

13
device/noise-types.go
View File

@ -9,19 +9,18 @@ import (
"crypto/subtle" "crypto/subtle"
"encoding/hex" "encoding/hex"
"errors" "errors"
"golang.org/x/crypto/chacha20poly1305"
) )
const ( const (
NoisePublicKeySize = 32 NoisePublicKeySize = 32
NoisePrivateKeySize = 32 NoisePrivateKeySize = 32
NoisePresharedKeySize = 32
) )
type ( type (
NoisePublicKey [NoisePublicKeySize]byte NoisePublicKey [NoisePublicKeySize]byte
NoisePrivateKey [NoisePrivateKeySize]byte NoisePrivateKey [NoisePrivateKeySize]byte
NoiseSymmetricKey [chacha20poly1305.KeySize]byte NoisePresharedKey [NoisePresharedKeySize]byte
NoiseNonce uint64 // padded to 12-bytes NoiseNonce uint64 // padded to 12-bytes
) )
@ -82,10 +81,10 @@ func (key NoisePublicKey) Equals(tar NoisePublicKey) bool {
return subtle.ConstantTimeCompare(key[:], tar[:]) == 1 return subtle.ConstantTimeCompare(key[:], tar[:]) == 1
} }
func (key *NoiseSymmetricKey) FromHex(src string) error { func (key *NoisePresharedKey) FromHex(src string) error {
return loadExactHex(key[:], src) return loadExactHex(key[:], src)
} }
func (key NoiseSymmetricKey) ToHex() string { func (key NoisePresharedKey) ToHex() string {
return hex.EncodeToString(key[:]) return hex.EncodeToString(key[:])
} }