Chacha20.xchacha20: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend as Chacha20
Lines 159-161 of bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend&start_line=159&end_line=161

import Base

# XChaCha20 with a 24-byte nonce.
def xchacha20(+key_bytes: List<&2, U32>, counter: U32, +nonce_bytes: List<&2, U32>, +plaintext: List<&2, U32>) -> Maybe<&2, List<&2, U32>>:
  when(valid(key_bytes, nonce_bytes, 24n), xencrypt_unchecked(key_bytes, counter, nonce_bytes, plaintext))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend&name=valid
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend&name=when
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend&name=xencrypt_unchecked