From 7b15ed9ef455b6b66c6b376898a88aef5d6a9970 Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Tue, 26 Apr 2011 09:55:32 +0200
Subject: Imported Upstream version 2011.04.13

---
 src/pkg/crypto/cipher/ctr.go | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/pkg/crypto/cipher/ctr.go')

diff --git a/src/pkg/crypto/cipher/ctr.go b/src/pkg/crypto/cipher/ctr.go
index 04436ec23..147b74fc2 100644
--- a/src/pkg/crypto/cipher/ctr.go
+++ b/src/pkg/crypto/cipher/ctr.go
@@ -22,6 +22,10 @@ type ctr struct {
 // NewCTR returns a Stream which encrypts/decrypts using the given Block in
 // counter mode. The length of iv must be the same as the Block's block size.
 func NewCTR(block Block, iv []byte) Stream {
+	if len(iv) != block.BlockSize() {
+		panic("cipher.NewCTR: iv length must equal block size")
+	}
+
 	return &ctr{
 		b:       block,
 		ctr:     dup(iv),
-- 
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