module Eth::Utils
Public Instance Methods
base256_to_int(str)
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# File lib/eth/utils.rb, line 32 def base256_to_int(str) RLP::Sedes.big_endian_int.deserialize str.sub(/\A(\x00)+/, '') end
bin_to_hex(string)
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# File lib/eth/utils.rb, line 24 def bin_to_hex(string) RLP::Utils.encode_hex string end
bin_to_prefixed_hex(binary)
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# File lib/eth/utils.rb, line 56 def bin_to_prefixed_hex(binary) prefix_hex bin_to_hex(binary) end
format_address(address)
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# File lib/eth/utils.rb, line 110 def format_address(address) Address.new(address).checksummed end
hash160(x)
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# File lib/eth/utils.rb, line 86 def hash160(x) ripemd160 sha256(x) end
hex_to_bin(string)
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# File lib/eth/utils.rb, line 28 def hex_to_bin(string) RLP::Utils.decode_hex remove_hex_prefix(string) end
int_to_base256(int)
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# File lib/eth/utils.rb, line 36 def int_to_base256(int) RLP::Sedes.big_endian_int.serialize int end
keccak256(x)
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# File lib/eth/utils.rb, line 70 def keccak256(x) Digest::SHA3.new(256).digest(x) end
keccak256_rlp(x)
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# File lib/eth/utils.rb, line 78 def keccak256_rlp(x) keccak256 RLP.encode(x) end
keccak512(x)
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# File lib/eth/utils.rb, line 74 def keccak512(x) Digest::SHA3.new(512).digest(x) end
normalize_address(address)
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# File lib/eth/utils.rb, line 12 def normalize_address(address) if address.nil? || address == '' '' elsif address.size == 40 hex_to_bin address elsif address.size == 42 && address[0..1] == '0x' hex_to_bin address[2..-1] else address end end
prefix_hex(hex)
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# File lib/eth/utils.rb, line 48 def prefix_hex(hex) hex.match(/\A0x/) ? hex : "0x#{hex}" end
prefix_message(message)
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# File lib/eth/utils.rb, line 6 def prefix_message(message) prefix = "\u0019Ethereum Signed Message:\n#{message.length}" return "#{prefix}#{message}" end
public_key_to_address(hex)
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# File lib/eth/utils.rb, line 60 def public_key_to_address(hex) bytes = hex_to_bin(hex) address_bytes = Utils.keccak256(bytes[1..-1])[-20..-1] format_address bin_to_prefixed_hex(address_bytes) end
remove_hex_prefix(s)
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# File lib/eth/utils.rb, line 52 def remove_hex_prefix(s) s[0,2] == '0x' ? s[2..-1] : s end
ripemd160(x)
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# File lib/eth/utils.rb, line 82 def ripemd160(x) Digest::RMD160.digest x end
sha256(x)
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# File lib/eth/utils.rb, line 66 def sha256(x) Digest::SHA256.digest x end
v_r_s_for(signature)
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# File lib/eth/utils.rb, line 40 def v_r_s_for(signature) [ signature[0].bytes[0], Utils.base256_to_int(signature[1..32]), Utils.base256_to_int(signature[33..65]), ] end
valid_address?(address)
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# File lib/eth/utils.rb, line 106 def valid_address?(address) Address.new(address).valid? end
zpad(x, l)
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# File lib/eth/utils.rb, line 90 def zpad(x, l) lpad x, BYTE_ZERO, l end
zpad_hex(s, l=32)
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# File lib/eth/utils.rb, line 102 def zpad_hex(s, l=32) zpad decode_hex(s), l end
zpad_int(n, l=32)
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# File lib/eth/utils.rb, line 98 def zpad_int(n, l=32) zpad encode_int(n), l end
zunpad(x)
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# File lib/eth/utils.rb, line 94 def zunpad(x) x.sub(/\A\x00+/, '') end
Private Instance Methods
encode_int(n)
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# File lib/eth/utils.rb, line 123 def encode_int(n) unless n.is_a?(Integer) && n >= 0 && n <= UINT_MAX raise ArgumentError, "Integer invalid or out of range: #{n}" end int_to_base256 n end
lpad(x, symbol, l)
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# File lib/eth/utils.rb, line 118 def lpad(x, symbol, l) return x if x.size >= l symbol * (l - x.size) + x end