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std/base32 ​

Base32 encode/decode (RFC 4648), pure Milo. The encoding otpauth:// URIs use for TOTP/HOTP secrets, and what DNS, S/MIME, and many license keys use for case-insensitive, human-transcribable binary. Alphabet A–Z 2–7, MSB-first, = padding. Input and output are byte strings, matching std/base64.

milo
from "std/base32" import { Base32 }

Functions ​

Base32.encode ​

milo
fn Base32.encode(input: &string): string

Encodes bytes to a padded Base32 string.

Base32.decode ​

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fn Base32.decode(input: &string): Result<string>

Strict RFC 4648 decode: the input must be =-padded to a multiple of 8 characters and contain only alphabet symbols. Lowercase is accepted (the alphabet has no lowercase symbols, so case-folding is unambiguous); whitespace, -, and anything else is an Err naming the byte offset. Use this on machine-produced input, where anything else means corruption.

Base32.decodeLoose ​

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fn Base32.decodeLoose(input: &string): Result<string>

Decode for human-transcribed secrets: ASCII whitespace, -, and = are skipped wherever they appear, and padding is optional. Every other non-alphabet byte is still an Err — leniency covers formatting, never content.

milo
let secret = Base32.decodeLoose("JBSW Y3DP EHPK 3PXP")!   // as pasted from an authenticator app