Crate b64ct

Pure Rust implementation of "B64" encoding, a minified subset of the standard Base64 encoding (RFC 4648, section 4) used by the PHC string format.

Omits padding (=) as well as extra whitespace, as described in the PHC string format specification:

https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md#b64

Supports the Base64 character subset: [A-Z], [a-z], [0-9], +, /

Implemented without data-dependent branches or look up tables, thereby providing "best effort" constant-time operation. Adapted from the following constant-time C++ implementation of Base64:

https://github.com/Sc00bz/ConstTimeEncoding/blob/master/base64.cpp

Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com). Derived code is dual licensed MIT + Apache 2 (with permission from Sc00bz).

Enums

Error

"B64" encoding errors.

Functions

decode	"B64" decode the given source byte slice into the provided destination buffer.
decode_vec	alloc Decode a "B64"-encoded string into a byte vector.
decoded_len	Get the length of the output from decoding the provided "B64"-encoded input.
encode	Encode the input byte slice as "B64", writing the result into the provided destination slice, and returning an ASCII-encoded string value.
encode_string	alloc Encode the input byte slice as a "B64"-encoded String.
encoded_len	Get the "B64"-encoded length of the given byte slice.