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fixes errors in codex encryption primitives

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Marcin Czenko 2025-07-04 19:28:04 +02:00
parent 3c390f7aa2
commit 1fb3f83f45
No known key found for this signature in database
GPG Key ID: 33DEA0C8E30937C0
1 changed files with 20 additions and 8 deletions
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28
codex/encryption/codexencryption.nim
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@ -8,8 +8,10 @@
## those terms.
import std/sequtils
import bearssl/[blockx, hash]
import stew/[byteutils, endians2]
import pkg/bearssl/[blockx, hash]
import pkg/stew/[byteutils, endians2]
import pkg/questionable/results
import ../rng
import ./bearsslhash
@ -50,22 +52,32 @@ proc deriveIvForBlockIndex(self: CodexEncryption, blockIndex: uint32): seq[byte]
proc encryptBlock*(
self: CodexEncryption, blockData: seq[byte], blockIndex: uint32
): seq[byte] =
): ?!seq[byte] =
if blockData.len mod IvSize != 0:
return failure("Block data length is not a multiple of 16!")
let key = self.deriveKeyForBlockIndex(blockIndex)
let iv = self.deriveIvForBlockIndex(blockIndex)
result = blockData
var outBuff = newSeqUninit[byte](blockData.len)
copyMem(addr outBuff[0], addr blockData[0], blockData.len)
var encCtx: AesBigCbcencKeys
aesBigCbcencInit(encCtx, addr key[0], key.len.uint)
aesBigCbcencRun(encCtx, addr iv[0], addr result[0], iv.len.uint)
aesBigCbcencRun(encCtx, addr iv[0], addr outBuff[0], outBuff.len.uint)
success move outBuff
proc decryptBlock*(
self: CodexEncryption, encryptedBlockData: seq[byte], blockIndex: uint32
): seq[byte] =
): ?!seq[byte] =
if encryptedBlockData.len mod IvSize != 0:
return failure("Encrypted block data length is not a multiple of 16!")
let key = self.deriveKeyForBlockIndex(blockIndex)
let iv = self.deriveIvForBlockIndex(blockIndex)
result = encryptedBlockData
var outBuff = newSeqUninit[byte](encryptedBlockData.len)
copyMem(addr outBuff[0], addr encryptedBlockData[0], encryptedBlockData.len)
var decCtx: AesBigCbcdecKeys
aesBigCbcdecInit(decCtx, addr key[0], key.len.uint)
aesBigCbcdecRun(decCtx, addr iv[0], addr result[0], iv.len.uint)
aesBigCbcdecRun(decCtx, addr iv[0], addr outBuff[0], outBuff.len.uint)
success move outBuff