The SHA1AsBase64(...) function has two variations, not counting syntax variations. It is used to encrypt a String using the standard SHA1 encryption algorithm.  The resulting bytes are then converted back into a String using a Base64 encoding with the optional URL safe dictionary.  When converting the String into bytes prior to encryption, an optional charset may be specified.  The default charset is UTF-8.

The URL safe Base64 dictionary uses "." in place of "+" and "-" in place of "/".  Also, it does not pad the final output to an even multiple of 4 characters using equal signs.

Syntax:
SHA1AsBase64( input-string )
SHA1AsBase64( input-string, charset )
input-string.SHA1AsBase64()
input-string.SHA1AsBase64( charset )

Parameter	Description
input-string	The String value to be encrypted.
charset	The charset to use, prior to encryption, when converting the String value into bytes.  The default is UTF-8.