Package org.bitcoinj.base

Class Bech32

java.lang.Object

org.bitcoinj.base.Bech32

public class Bech32
extends Object

Implementation of the Bech32 encoding. Used in the implementation of SegwitAddress and also provides an API for encoding/decoding arbitrary Bech32 data. To parse Bech32 Bitcoin addresses, use AddressParser. To encode arbitrary Bech32 data, see encodeBytes(Encoding, String, byte[]). To decode arbitrary Bech32 strings, see decodeBytes(String, String, Encoding) or decode(String).

Based on the original Coinomi implementation.

See Also:

• BIP173
• BIP350

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Bech32.Bech32Bytes	Binary data in 5-bits-per-byte format as used in Bech32 encoding/decoding.
static class	Bech32.Bech32Data	Bech32 data in 5-bit byte format with Bech32.Encoding and human-readable part (HRP) information.
static enum	Bech32.Encoding	Enumeration of known Bech32 encoding format types: Bech32 and Bech32m.

Constructor Summary

Constructors

Constructor	Description
Bech32()

Method Summary

Modifier and Type	Method	Description
static Bech32.Bech32Data	decode(String str)	Decode a Bech32 string.
static byte[]	decodeBytes(String bech32, String expectedHrp, Bech32.Encoding expectedEncoding)	Decode a Bech32 string to a byte array.
static String	encode(Bech32.Bech32Data bech32)	Encode a Bech32 string.
static String	encode(Bech32.Encoding encoding, String hrp, Bech32.Bech32Bytes values)	Encode a Bech32 string.
static String	encodeBytes(Bech32.Encoding encoding, String hrp, byte[] bytes)	Encode a byte array to a Bech32 string

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Bech32

public Bech32()

Method Details

encodeBytes

public static String encodeBytes(Bech32.Encoding encoding,
 String hrp,
 byte[] bytes)

Encode a byte array to a Bech32 string

Parameters:

encoding - Desired encoding Bech32 or Bech32m

hrp - human-readable part to use for encoding

bytes - Arbitrary binary data (8-bits per byte)

Returns:

A Bech32 string

decodeBytes

public static byte[] decodeBytes(String bech32,
 String expectedHrp,
 Bech32.Encoding expectedEncoding)

Decode a Bech32 string to a byte array.

Parameters:

bech32 - A Bech32 format string

expectedHrp - Expected value for the human-readable part

expectedEncoding - Expected encoding

Returns:

Decoded value as byte array (8-bits per byte)

Throws:

AddressFormatException - if unexpected hrp or encoding

encode

public static String encode(Bech32.Bech32Data bech32)

Encode a Bech32 string.

Parameters:

bech32 - Contains 5-bits/byte data, desired encoding and human-readable part

Returns:

A string containing the Bech32-encoded data

encode

public static String encode(Bech32.Encoding encoding,
 String hrp,
 Bech32.Bech32Bytes values)

Encode a Bech32 string.

Parameters:

encoding - The requested encoding

hrp - The requested human-readable part

values - Binary data in 5-bit per byte format

Returns:

A string containing the Bech32-encoded data

decode

public static Bech32.Bech32Data decode(String str)
                                throws AddressFormatException

Decode a Bech32 string.

To get the fully-decoded data, call Bech32.Bech32Bytes.decode5to8() on the returned Bech32Data.

Parameters:

str - A string containing Bech32-encoded data

Returns:

An object with the detected encoding, hrp, and decoded data (in 5-bit per byte format)

Throws:

AddressFormatException - if the string is invalid