Chacha.encrypt_blocks: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha.bend as Chacha
Lines 158-164 of bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha.bend&start_line=158&end_line=164

import Base

# for j = 0 .. : block j is XORed with chacha20_block(key, counter + j, nonce).
def encrypt_blocks(bs: List<&2, List<&2, U32>>, +n: Nat, +key: List<&2, U32>, +counter: U32, +nonce: List<&2, U32>) -> List<&2, U32>:
  match bs:
    case Nil{}: Nil{}
    case b <> rest:
      List.append(&2, U32, xor_bytes(b, block_rounds(n, key, counter, nonce)),
        encrypt_blocks(rest, n, key, U32.add(counter, 1), nonce))

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha.bend&name=block_rounds
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha.bend&name=xor_bytes