javascript:

加密:btoa("password")

解密:atob("cGFzc3dvcmQ=")

php:

加密:base64_encode ("password")

解密:base64_decode ("cGFzc3dvcmQ=")

java:

加密:
String originalInput = "password";
String encodedString=Base64.getEncoder()
.encodeToString(originalInput.getBytes());

解密:
String encodedString="cGFzc3dvcmQ=";
byte[] decodedBytes = Base64.getDecoder().decode(encodedString);
String decodedString = new String(decodedBytes);

C 语言:

加密(编辑器:visual studio 2017):

解密(编辑器:visual studio 2017):