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encoding: introducing type cipher=aes128

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Introducing the cipher type to ease changing cipher.
No functional change

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>
This commit is contained in:
Csaba Kiraly 2023-06-02 19:03:57 +02:00
parent 5c62d100e4
commit 13e48b8836
No known key found for this signature in database
GPG Key ID: 0FE274EE8C95166E
1 changed files with 7 additions and 4 deletions
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11
libp2pdht/private/eth/p2p/discoveryv5/encoding.nim
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@ -39,6 +39,9 @@ declareCounter discovery_session_decrypt_failures, "Session decrypt failures"
logScope:
topics = "discv5"
type
cipher = aes128
const
version: uint16 = 1
idSignatureText = "discovery v5 identity proof"
@ -161,7 +164,7 @@ proc deriveKeys*(n1, n2: NodeId, priv: PrivateKey, pub: PublicKey,
ok secrets
proc encryptGCM*(key: AesKey, nonce, pt, authData: openArray[byte]): seq[byte] =
var ectx: GCM[aes128]
var ectx: GCM[cipher]
ectx.init(key, nonce, authData)
result = newSeq[byte](pt.len + gcmTagSize)
ectx.encrypt(pt, result)
@ -174,7 +177,7 @@ proc decryptGCM*(key: AesKey, nonce, ct, authData: openArray[byte]):
debug "cipher is missing tag", len = ct.len
return
var dctx: GCM[aes128]
var dctx: GCM[cipher]
dctx.init(key, nonce, authData)
var res = newSeq[byte](ct.len - gcmTagSize)
var tag: array[gcmTagSize, byte]
@ -188,7 +191,7 @@ proc decryptGCM*(key: AesKey, nonce, ct, authData: openArray[byte]):
return some(res)
proc encryptHeader*(id: NodeId, iv, header: openArray[byte]): seq[byte] =
var ectx: CTR[aes128]
var ectx: CTR[cipher]
ectx.init(id.toByteArrayBE().toOpenArray(0, 15), iv)
result = newSeq[byte](header.len)
ectx.encrypt(header, result)
@ -370,7 +373,7 @@ proc decodeHeader*(id: NodeId, iv, maskedHeader: openArray[byte]):
DecodeResult[(StaticHeader, seq[byte])] =
# No need to check staticHeader size as that is included in minimum packet
# size check in decodePacket
var ectx: CTR[aes128]
var ectx: CTR[cipher]
ectx.init(id.toByteArrayBE().toOpenArray(0, aesKeySize - 1), iv)
# Decrypt static-header part of the header
var staticHeader = newSeq[byte](staticHeaderSize)