sha256.bend source

sha256.bend on the hub · documented module

import Baseimport ./buffer.bend as Buffer# Sole production hash API. Packed input and output, four bytes per U32,# big-endian. Consumes input; returns exactly eight words, or None for an# oversized byte length. No byte-list or digest-list compatibility API.def sha256(words: Array<U32>, byte_length: Nat) -> Maybe<&1,Array<U32>>:  Buffer.sha256(words,byte_length)def hex_digit_if(x: U32, small: Bool) -> Char:  match small:    case True{}:      Chr{(48 + x : U32)}    case False{}:      Chr{(87 + x : U32)}def hex_digit(+x: U32) -> Char:  hex_digit_if(x, U32.is_lt(x, 10))def hex_word_go(n: Nat, +x: U32, acc: String) -> String:  match n:    case 0n:      acc    case 1n+p:      hex_word_go(p, U32.shrn(x, 4n), SCon{hex_digit((x .&. 15 : U32)), acc})def hex_word(x: U32) -> String:  hex_word_go(8n, x, "")# Formatting helper consumes eight words; it does not create a digest list.def hex_walk(n: Nat, +index: U32, pair: Array<U32> & U32) -> String:  match n pair:    case 0n Tuple{a,w}: hex_word(w)    case 1n+p Tuple{a,w}: hex_word(w) ++ hex_walk(p,U32.inc(index),Array.get(U32,a,index))def hex(a: Array<U32>) -> String:  hex_walk(7n,1,Array.get(U32,a,0))