base-x

Arbitrary base encoding & decoding. Converts between binary data and bases 2 - 65,536

Java 6+

Encodes a byte array by treating it as a single large unsigned integer and performing long division to convert it to its representation in the new base. Every leading 0 byte in the array (not significant when treated as a number) is encoded as the first character of the new base's alphabet. This allows conversion to any base but is not RFC3548 or standard base 16/32/64 compliant.

Example

AsciiRadixCoder base58 = AsciiRadixCoder.of("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz");

byte[] decoded = base58.decode("5Kd3NBUAdUnhyzenEwVLy9pBKxSwXvE9FMPyR4UKZvpe6E3AgLr");
// decoded : [-128, -19, -37, -36, 17, 104, -15, -38, -22, -37, -45, -28, 76, 30, 63, -113, 90, 40, 76, 32, 41, -9, -118, -46, 106, -7, -123, -125, -92, -103, -34, 91, 25, 19, -92, -8, 99]

String encoded = base58.encode(decoded);
// encoded : 5Kd3NBUAdUnhyzenEwVLy9pBKxSwXvE9FMPyR4UKZvpe6E3AgLr