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afd8f84c1a
There are many use-cases where a PHP user is currently using sodium_compat's implementation of this low-level XChaCha20 API. For example, multi-part message processing (in low-memory settings) for a ciphertext that was encrypted with XChaCha20-Poly1305 (rather than the secretstream API). Adding this function to ext/sodium offers better performance and lowers users' memory usage with the polyfill, and ensures that users coming from other languages that provide libsodium bindings have a more consistent experience with our bindings. This is a win-win. This patch follows the libsodium precedent of adding functions instead of optional parameters to existing functions. The parameter order is also consistent with the C API. https://doc.libsodium.org/advanced/stream_ciphers/xchacha20#usage Closes GH-8276.