presets: minor fixes

src/presets/aead-random-cipher.js

@@ -31,7 +31,7 @@ const HKDF_HASH_ALGORITHM = 'sha1';
  *
  * @params
  *   method: The encryption/decryption method.
- *   info: An info for HKDF.
+ *   info(optional): An info for HKDF.
  *   factor(optional): Expand random padding length(0-255) by factor times. It must be in [1, 10]. Default is 2.
  *
  * @examples

src/presets/exp-base-auth-stream.js

@@ -104,7 +104,7 @@ export default class ExpBaseAuthStreamPreset extends IPreset {
       // prepare
       const iv = crypto.randomBytes(IV_LEN);
       const secretKey = ExpBaseAuthStreamPreset.key;
-      const keyForHMAC = xor(iv, keyForEncryption.slice(0, IV_LEN));
+      const keyForHMAC = xor(iv, secretKey.slice(0, IV_LEN));
 
       // initialize cipher/decipher
       this._cipher = crypto.createCipheriv(ExpBaseAuthStreamPreset.cipherName, secretKey, iv);

src/presets/ss-stream-cipher.js

@@ -94,7 +94,7 @@ export default class SsStreamCipherPreset extends IPreset {
   beforeIn({buffer, fail}) {
     if (!this._decipher) {
       if (buffer.length < IV_LEN) {
-        return fail(`cannot get iv, buffer is too short(${buffer.length}bytes): ${buffer.toString('hex')}`);
+        return fail(`buffer is too short ${buffer.length} bytes to get iv, dump=${buffer.toString('hex')}`);
       }
       const iv = buffer.slice(0, IV_LEN);
       this._decipher = crypto.createDecipheriv(SsStreamCipherPreset.cipherName, SsStreamCipherPreset.key, iv);

src/presets/stats.js

@@ -100,8 +100,8 @@ export default class StatsPreset extends IPresetStatic {
     if (!Number.isSafeInteger(save_interval)) {
       throw Error('\'save_interval\' must be an integer');
     }
-    if (save_interval < 5) {
-      throw Error('\'save_interval\' must be greater than 5');
+    if (save_interval < 1) {
+      throw Error('\'save_interval\' must be greater than 0');
     }
   }