1 files changed, 5 insertions, 3 deletions
diff --git a/crypto/src/crypto/modes/SicBlockCipher.cs b/crypto/src/crypto/modes/SicBlockCipher.cs
index 239f99478..0bea4a455 100644
--- a/crypto/src/crypto/modes/SicBlockCipher.cs
+++ b/crypto/src/crypto/modes/SicBlockCipher.cs
@@ -56,16 +56,18 @@ namespace Org.BouncyCastle.Crypto.Modes
if (blockSize < IV.Length)
throw new ArgumentException("CTR/SIC mode requires IV no greater than: " + blockSize + " bytes.");
- if (blockSize - IV.Length > 8)
- throw new ArgumentException("CTR/SIC mode requires IV of at least: " + (blockSize - 8) + " bytes.");
- Reset();
+ int maxCounterSize = System.Math.Min(8, blockSize / 2);
+ if (blockSize - IV.Length > maxCounterSize)
+ throw new ArgumentException("CTR/SIC mode requires IV of at least: " + (blockSize - maxCounterSize) + " bytes.");
// if null it's an IV changed only.
if (ivParam.Parameters != null)
{
cipher.Init(true, ivParam.Parameters);
}
+
+ Reset();
}
public virtual string AlgorithmName
|
