mirror of
https://github.com/in3rsha/sha256-animation
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49 lines
1.4 KiB
Ruby
49 lines
1.4 KiB
Ruby
require_relative "sha256lib.rb"
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# ----------
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# hash256.rb - The hash function used in Bitcoin. Basically just runs sha256.rb twice.
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# ----------
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# Command Line Arguments
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$input = ARGV[0] || "0x0100000000000000000000000000000000000000000000000000000000000000000000003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a29ab5f49ffff001d1dac2b7c" # "string"|"0xaabbcc"|"0b10110100"
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$delay = ARGV[1] || "fast" # [enter|normal|fast|nodelay]
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# Assume that every input is hexadecimal bytes
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if $input[0..1] != "0x"
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$input = "0x" + $input # prepend 0x if there isn't one (so the upcoming functions can detect it correctly)
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end
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# Make sure it's a valid size (even number of characters)
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if $input.size % 2 != 0
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puts "Invalid input to hash256.rb. Expecting even number of hex characters (i.e. bytes)."
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exit
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end
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# Convert hex to bytes
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$type = input_type($input)
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$bytes = bytes($input, $type)
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$message = $bytes.map { |x| x.to_s(2).rjust(8, "0") }.join
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# Note about hitting enter to step
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if $delay == "enter"
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puts "Hit enter to step through."
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STDIN.gets
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end
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# Catch Ctrl-C to prevent unsightly errors when terminating early
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Signal.trap("SIGINT") do
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exit
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end
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# 1. First Hash
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load "sha256.rb"
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# 2. Use output of first hash as input to second hash
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$input = "0x" + $digest # prepend 0x to show that it's hex bytes
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$type = input_type($input)
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$bytes = bytes($input, $type)
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$message = $bytes.map { |x| x.to_s(2).rjust(8, "0") }.join
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# 2. Second Hash
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load "sha256.rb"
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