base64: invalid input

**Issue by [Drjacky](https://github.com/Drjacky)**
_Tuesday Jun 25, 2019 at 15:35 GMT_
_Originally opened as https://github.com/googlesamples/android-credentials/issues/40_

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When I use iTerm2 terminal and work with the file, it shows:
> base64: invalid input

But still generating some part of a wrong `certificate in hex` and generating a wrong `SMS Retriever hash code` as well.
But when I use regular Terminal, it works well.

A sample wrong output:
```
➜ Desktop ./sms_retriever_hash_v9.sh --package com.example.test --keystore /path/keystore.jks

package name: com.example.test
keystore file: /path/keystore.jks

File /path/keystore.jks is found.

Enter keystore password: password
base64: invalid input

certificate in hex: 328202c5308201ada00362010202043d1336f8300d06092a864486f70d01010b050030133111300f0603550403430853

SHA-256 output in hex: bf0ae40bf16485b2320765f3c824e263dfba8d09ec46307d6b4dd3153cfbc287

First 8 bytes encoded by base64: ywrkS/HkhbI

SMS Retriever hash code: ywrkS/HkhbI
```

Machine: Mac OS 10.14.5
iTerm2 version: 3.2.9

Start with sms_retriever_hash_v9.sh and reproduce the command shown using iTerm2 and regular Terminal on macOS, focusing on the reported `base64: invalid input` output. Done means the script completes without that error and produces the same correct certificate, SHA-256 output, and SMS Retriever hash in both terminals.

Written by the indexing model from the issue text.