base32-0.2.1.0: Fast RFC 4648-compliant Base32 encoding
Copyright(c) 2019-2020 Emily Pillmore
LicenseBSD-style
MaintainerEmily Pillmore <emilypi@cohomolo.gy>
Stabilitystable
Portabilitynon-portable
Safe HaskellTrustworthy
LanguageHaskell2010

Data.ByteString.Lazy.Base32.Hex

Description

This module contains ByteString-valued combinators for implementing the RFC 4648 specification of the Base32hex encoding format. This includes strictly padded/unpadded decoding variants, as well as internal and external validation for canonicity.

Synopsis

Encoding

encodeBase32 :: ByteString -> Text Source #

Encode a ByteString value as a Base32hex Text value with padding.

See: RFC-4648 section 7

Examples:

>>> encodeBase32 "Sun"
"ADQMS==="

encodeBase32' :: ByteString -> ByteString Source #

Encode a ByteString as a Base32hex ByteString value with padding.

See: RFC-4648 section 7

Examples:

>>> encodeBase32' "Sun"
"ADQMS==="

encodeBase32Unpadded :: ByteString -> Text Source #

Encode a ByteString value as Base32hex Text without padding. Note that for Base32hex, padding is optional. If you call this function, you will simply be encoding as Base32hex and stripping padding chars from the output.

See: RFC-4648 section 7

Examples:

>>> encodeBase32Unpadded "Sun"
"ADQMS"

encodeBase32Unpadded' :: ByteString -> ByteString Source #

Encode a ByteString value as Base32hex without padding. Note that for Base32hex, padding is optional. If you call this function, you will simply be encoding as Base32hex and stripping padding chars from the output.

See: RFC-4648 section 7

Examples:

>>> encodeBase32Unpadded' "Sun"
"ADQMS"

Decoding

decodeBase32 :: ByteString -> Either Text ByteString Source #

Decode an arbitrarily padded Base32hex encoded ByteString value. If its length is not a multiple of 4, then padding chars will be added to fill out the input to a multiple of 4 for safe decoding as Base32hex-encoded values are optionally padded.

See: RFC-4648 section 7

Examples:

>>> decodeBase32 "ADQMS==="
Right "Sun"
>>> decodeBase32 "ADQMS"
Right "Sun"
>>> decodeBase32 "ADQMS==="
Left "Base32-encoded bytestring has invalid padding"

decodeBase32Unpadded :: ByteString -> Either Text ByteString Source #

Decode an unpadded Base32hex-encoded ByteString value. Input strings are required to be unpadded, and will undergo validation prior to decoding to confirm.

In general, unless unpadded Base32hex is explicitly required, it is safer to call decodeBase32.

See: RFC-4648 section 7

Examples:

>>> decodeBase32Unpadded "ADQMS"
Right "Sun"
>>> decodeBase32Unpadded "ADQMS==="
Left "Base32-encoded bytestring has invalid padding"

decodeBase32Padded :: ByteString -> Either Text ByteString Source #

Decode a padded Base32hex-encoded ByteString value. Input strings are required to be correctly padded, and will be validated prior to decoding to confirm.

In general, unless padded Base32hex is explicitly required, it is safer to call decodeBase32.

See: RFC-4648 section 7

Examples:

>>> decodeBase32Padded "ADQMS==="
Right "Sun"
>>> decodeBase32Padded "ADQMS"
Left "Base32-encoded bytestring requires padding"

Validation

isBase32Hex :: ByteString -> Bool Source #

Tell whether a ByteString is Base32hex-encoded.

Examples:

>>> isBase32Hex "ADQMS"
True
>>> isBase32Hex "ADQMS==="
True
>>> isBase32Hex "ADQMS=="
False

isValidBase32Hex :: ByteString -> Bool Source #

Tell whether a ByteString is a valid Base32hex format.

This will not tell you whether or not this is a correct Base32hex representation, only that it conforms to the correct shape. To check whether it is a true Base32hex encoded ByteString value, use isBase32Hex.

Examples:

>>> isValidBase32Hex "ADQMS"
True
>>> isValidBase32Hex "ADQMS="
False
>>> isValidBase32Hex "ADQMS%"
False