diff options
| -rw-r--r-- | crypto/src/crypto/modes/SicBlockCipher.cs | 8 |
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 |