NewEncoding returns a new padded Encoding defined by the given alphabet, which must be a 64-byte string that does not contain the padding character or CR / LF ('\r', '\n').

RawStdEncoding is the standard unpadded base64 encoding defined in RFC 4648 section 3.2.

RawURLEncoding is the unpadded alternate base64 encoding defined in RFC 4648.

StdEncoding is the standard base64 encoding, as defined in RFC 4648.

URLEncoding is the alternate base64 encoding defined in RFC 4648.

An Encoding is a radix 64 encoding/decoding scheme, defined by a 64-character alphabet.