Crate base32 

Fast base32 encoding and decoding with SIMD acceleration, constant-time operations, and const fn support.

Nine alphabet variants are available via Alphabet:

Variant	Characters	Padding	Description
Rfc4648	A-Z 2-7	=	RFC 4648 (standard)
Rfc4648NoPadding	A-Z 2-7	none	RFC 4648 without padding
Rfc4648Lower	a-z 2-7	=	RFC 4648 lowercase
Rfc4648LowerNoPadding	a-z 2-7	none	RFC 4648 lowercase no pad
Rfc4648Hex	0-9 A-V	=	RFC 4648 extended hex
Rfc4648HexNoPadding	0-9 A-V	none	RFC 4648 extended hex no pad
Rfc4648HexLower	0-9 a-v	=	RFC 4648 extended hex lower
Rfc4648HexLowerNoPadding	0-9 a-v	none	RFC 4648 extended hex lower no pad
Crockford	0-9 A-H J-K M-N P-Z	none	Crockford (no I L O U)

Feature flags

Flag	Description
std	std::error::Error trait impls (enabled by default)
alloc	String/Vec-returning convenience APIs
serde	Serde serialize/deserialize helpers

Performance

The encode_into and decode_into functions automatically dispatch to SIMD-accelerated paths (AVX2 on x86/x86_64, NEON on aarch64). When a constant-time guarantee is required, use encode_into_constant_time or decode_into_constant_time.

const fn support

encode_array and decode_array are const fn, enabling base32 encoding and decoding at compile time.

Examples

let encoded = base32::encode(b"hello", base32::Alphabet::Rfc4648);
assert_eq!(encoded, "NBSWY3DP");

let decoded = base32::decode(b"NBSWY3DP", base32::Alphabet::Rfc4648).unwrap();
assert_eq!(decoded, b"hello");

let url = base32::encode(b"hello", base32::Alphabet::Crockford);
assert_eq!(url, "D1JPRV3F");

Enums

Alphabet

DecodeError

EncodeError

Functions

decodealloc

Decodes a base32 string into bytes.

decode_array

Decodes a base32 string into a fixed-size array at compile time.

decode_into

Decodes a base32 string into an existing buffer.

decode_into_constant_time

Constant-time base32 decoding. Processes all input data without secret-dependent branches or memory accesses, making it suitable for cryptographic applications.

encodealloc

Encode Encodes bytes to a base32 string using the given Alphabet.

encode_array

Encodes data into a fixed-size array at compile time.

encode_into

Encodes bytes into an existing buffer.

encode_into_constant_time

Constant-time base32 encoding. Processes all input data without secret-dependent branches or memory accesses, making it suitable for cryptographic applications.

encode_into_stringalloc

Appends the base32-encoded representation of data to a String.

encoded_length

Returns the size in bytes of the input data after base32 encoding.