Home Explore Help
Sign In
mirror
/
CryptoSwift
mirror of https://github.com/krzyzanowskim/CryptoSwift.git
2
0
Fork 0
Files Issues 0 Wiki
Browse Source

Prevent overflow

Marcin Krzyżanowski 8 years ago
parent
08c75f48de
commit
38343e69a5
1 changed files with 1 additions and 1 deletions
Unified View Show Diff Stats
  1. 1 1
      Sources/CryptoSwift/ChaCha20.swift

+ 1 - 1
Sources/CryptoSwift/ChaCha20.swift
View File 

@@ -223,7 +223,7 @@ public final class ChaCha20: BlockCipher {
 
             var u: UInt32 = 1
 
             var u: UInt32 = 1
 
             for i in 0..<4 {
 
             for i in 0..<4 {
 
                 u += UInt32(counter[i])
 
                 u += UInt32(counter[i])
 
-                counter[i] = UInt8(u)
 
+                counter[i] = UInt8(u & 0xFF)
 
                 u >>= 8
 
                 u >>= 8
 
             }
 
             }
 
             bytes = Array(bytes[ChaCha20.blockSize..<bytes.endIndex])
 
             bytes = Array(bytes[ChaCha20.blockSize..<bytes.endIndex])