SHA-256 Merkle tree: Difference between revisions

Line 734:

=={{header|Wren}}==

This script uses the implementation from the [[SHA-256#Wren]] task to process the example file. To import the former copy it (without the examples) to a file called 'sha256.wren' in the same directory as this script.

<lang ecmascript>import "io" for File

⚫

import "/crypto" for Sha256, Bytes

import "/seq" for Lst

import "/str" for Str

import "/~~sha256~~" for ~~sha256~~

import "/fmt" for Conv

⚫

import "/~~fmt~~" for ~~Conv~~, ~~Fmt~~

var bytes = File.read("title.png").bytes.toList

var chunks = Lst.chunks(bytes, 1024)

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var i = 0

for (chunk in chunks) {

var h = ~~sha256~~.~~call~~(chunk.map { |b| String.fromByte(b) }.join())

var h = Sha256.digest(chunk.map { |b| String.fromByte(b) }.join())

hashes[i] = Str.chunks(h, 2).map { |x| Conv.atoi(x, 16) }.toList

i = i + 1

}

var buffer = List.filled(64, 0)

while (hashes.count > 1) {

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for (j in 0..31) buffer[j] = hashes[i][j]

for (j in 0..31) buffer[j+32] = hashes[i+1][j]

var h = ~~sha256~~.~~call~~(buffer.map { |b| String.fromByte(b) }.join())

var h = Sha256.digest(buffer.map { |b| String.fromByte(b) }.join())

var hb = Str.chunks(h, 2).map { |x| Conv.atoi(x, 16) }.toList

hashes2.add(hb)

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hashes = hashes2

}

System.print(~~Fmt~~.v(~~"xz", 2,~~ hashes[0]~~, 0, "", ""~~))</lang>

System.print(Bytes.toHexString(hashes[0]))</lang>