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Vendor skywalker-labs
Package constant-time-encoding
Short Description Constant-time implementations of RFC 4648 encoding (Base64, Base32, Hex) and other variants (Base64UrlSafe, Base64DotSlash, Base32Hex)
License MIT
Homepage https://github.com/skywalker-labs/constant-time-encoding

Keywords base64 base32 encoding rfc4648 hex base16 bin2hex hex2bin base64_encode base64_decode base32_encode base32_decode

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Informations about the package constant-time-encoding

Skywalker Constant-Time Encoding

Constant-time implementations of RFC 4648 encoding (Base64, Base32, Hex) and other variants.

This library aims to offer character encoding functions that do not leak information about what you are encoding/decoding via processor cache misses.

Features

Constant-Time Encoding/Decoding: Prevents cache-timing attacks.
Multiple Encodings:
- Base64 (RFC 4648)
- Base64UrlSafe (URL-safe variant)
- Base64DotSlash (Crypt version, ./[A-Z][a-z][0-9])
- Base64DotSlashOrdered (Ordered variant, [.-9][A-Z][a-z])
- Base32 (RFC 4648)
- Base32Hex (RFC 4648 base32hex)
- Hex (Base16)
Security: Uses pack() and unpack() instead of chr() and ord() for safer bit manipulation.
Robust: Strict padding validation (optional).

Requirements

PHP 7.4 or newer (including PHP 8.x).

Installation

Usage

You can use the Skywalker\ConstantTime\Encoding class as a facade for all encoding methods, or use specific classes directly.

Using the Encoding Facade

Using Specific Classes

If you only need a specific encoding, you can import the relevant class directly:

Output Example

Security

This library was designed to eliminate cache-timing side-channels from encoding operations. It is intended for use in cryptographic contexts where timing leaks could expose sensitive data.

Support

If your company uses this library in their products or services, you may be interested in purchasing a support contract from Skywalker Labs.

License

This project is licensed under the MIT License - see the LICENSE.txt file for details.

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Version v1.0.0 Release 15. Feb 2026
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