Fixes #21

Alexandre Stein · web-flow · commit 79ebcd650e97 · 2018-08-10T11:40:56.000+02:00
diff --git a/aes_gcm.go b/aes_gcm.go
@@ -85,6 +85,10 @@ func (alg *AesGcm) Decrypt(aad, cek, iv, cipherText, authTag []byte) (plainText
 
 	cipherWithTag:=append(cipherText,authTag...)
 
+	if nonceSize := len(iv); nonceSize != aesgcm.NonceSize() {
+		return nil, errors.New(fmt.Sprintf("AesGcm.Decrypt(): expected nonce of size %v bits, but was given %v bits.", aesgcm.NonceSize()<<3, nonceSize<<3))
+	}
+	
 	if plainText,err = aesgcm.Open(nil, iv, cipherWithTag, aad);err!=nil {
 		return nil,err
 	}

Original file line number	Diff line number	Diff line change
`@@ -85,6 +85,10 @@ func (alg *AesGcm) Decrypt(aad, cek, iv, cipherText, authTag []byte) (plainText`
`85`	`85`
`86`	`86`	`cipherWithTag:=append(cipherText,authTag...)`
`87`	`87`
	`88`	`+ if nonceSize := len(iv); nonceSize != aesgcm.NonceSize() {`
	`89`	`+ return nil, errors.New(fmt.Sprintf("AesGcm.Decrypt(): expected nonce of size %v bits, but was given %v bits.", aesgcm.NonceSize()<<3, nonceSize<<3))`
	`90`	`+ }`
	`91`	`+`
`88`	`92`	`if plainText,err = aesgcm.Open(nil, iv, cipherWithTag, aad);err!=nil {`
`89`	`93`	`return nil,err`
`90`	`94`	`}`