1 files changed, 5 insertions, 1 deletions
diff --git a/crypto/src/crypto/modes/GOFBBlockCipher.cs b/crypto/src/crypto/modes/GOFBBlockCipher.cs
index a91562549..4299f11a9 100644
--- a/crypto/src/crypto/modes/GOFBBlockCipher.cs
+++ b/crypto/src/crypto/modes/GOFBBlockCipher.cs
@@ -169,7 +169,11 @@ namespace Org.BouncyCastle.Crypto.Modes
}
N3 += C2;
N4 += C1;
- intTobytes(N3, ofbV, 0);
+ if (N4 < C1) // addition is mod (2**32 - 1)
+ {
+ N4++;
+ }
+ intTobytes(N3, ofbV, 0);
intTobytes(N4, ofbV, 4);
cipher.ProcessBlock(ofbV, 0, ofbOutV, 0);
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