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crypto/cipher: use AEAD.NonceSize to make nonce in the example

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The existing example uses hard-coded constant to make nonce buffer.
Using AEAD.NonceSize makes it a more portable and appropriate example.

Fixes: #48372

Change-Id: I7c7a38ed48aff46ca11ef4f5654c778eac13dde6
GitHub-Last-Rev: 03ccbb16df4ca9cbd4a014836aee0f54b2ff3002
GitHub-Pull-Request: golang/go#48373
Reviewed-on: https://go-review.googlesource.com/c/go/+/349603
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Sean Liao <sean@liao.dev>
Reviewed-by: Roland Shoemaker <roland@golang.org>
This commit is contained in:
najeira 2021-09-14 04:47:41 +00:00 committed by Gopher Robot
parent 5413abc440
commit 2cb9e7f68f
1 changed files with 5 additions and 5 deletions
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10
src/crypto/cipher/example_test.go
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@ -29,14 +29,14 @@ func ExampleNewGCM_encrypt() {
panic(err.Error()) panic(err.Error())
} }
// Never use more than 2^32 random nonces with a given key because of the risk of a repeat. aesgcm, err := cipher.NewGCM(block)
nonce := make([]byte, 12) if err != nil {
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
panic(err.Error()) panic(err.Error())
} }
aesgcm, err := cipher.NewGCM(block) // Never use more than 2^32 random nonces with a given key because of the risk of a repeat.
if err != nil { nonce := make([]byte, aesgcm.NonceSize())
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
panic(err.Error()) panic(err.Error())
} }