From: Adam Langley <agl@golang.org>
Date: Tue, 29 Mar 2011 19:47:35 +0000 (-0400)
Subject: crypto/cipher: bad CTR IV length now triggers panic
X-Git-Tag: weekly.2011-04-04~56
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=9225bbfc0c6559aa4002ea8f35696cd74475429d;p=gostls13.git

crypto/cipher: bad CTR IV length now triggers panic

R=rsc
CC=golang-dev
https://golang.org/cl/4326042
---

diff --git a/src/pkg/crypto/cipher/ctr.go b/src/pkg/crypto/cipher/ctr.go
index 04436ec23b..147b74fc2f 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),