module Web3::Eth::Abi::Utils

Public Instance Methods

base58_check_to_bytes(s) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 62
def base58_check_to_bytes(s)
  leadingzbytes = s.match(/\A1*/)[0]
  data = Constant::BYTE_ZERO * leadingzbytes.size + BaseConvert.convert(s, 58, 256)

  raise ChecksumError, "double sha256 checksum doesn't match" unless double_sha256(data[0...-4])[0,4] == data[-4..-1]
  data[1...-4]
end
big_endian_to_int(s) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 89
def big_endian_to_int(s)
  RLP::Sedes.big_endian_int.deserialize s.sub(/\A(\x00)+/, '')
end
bytearray_to_int(arr) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 137
def bytearray_to_int(arr)
  o = 0
  arr.each {|x| o = (o << 8) + x }
  o
end
bytes_to_base58_check(bytes, magicbyte=0) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 70
def bytes_to_base58_check(bytes, magicbyte=0)
  bs = "#{magicbyte.chr}#{bytes}"
  leadingzbytes = bs.match(/\A#{Constant::BYTE_ZERO}*/)[0]
  checksum = double_sha256(bs)[0,4]
  '1'*leadingzbytes.size + BaseConvert.convert("#{bs}#{checksum}", 256, 58)
end
bytes_to_int_array(bytes) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 147
def bytes_to_int_array(bytes)
  bytes.unpack('C*')
end
ceil32(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 77
def ceil32(x)
  x % 32 == 0 ? x : (x + 32 - x%32)
end
coerce_addr_to_hex(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 171
def coerce_addr_to_hex(x)
  if x.is_a?(Numeric)
    encode_hex zpad(int_to_big_endian(x), 20)
  elsif x.size == 40 || x.size == 0
    x
  else
    encode_hex zpad(x, 20)[-20..-1]
  end
end
coerce_to_bytes(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 161
def coerce_to_bytes(x)
  if x.is_a?(Numeric)
    int_to_big_endian x
  elsif x.size == 40
    decode_hex(x)
  else
    x
  end
end
coerce_to_int(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 151
def coerce_to_int(x)
  if x.is_a?(Numeric)
    x
  elsif x.size == 40
    big_endian_to_int decode_hex(x)
  else
    big_endian_to_int x
  end
end
decode_hex(s) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 85
def decode_hex(s)
  RLP::Utils.decode_hex s
end
decode_int(v) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 132
def decode_int(v)
  raise ArgumentError, "No leading zero bytes allowed for integers" if v.size > 0 && (v[0] == Constant::BYTE_ZERO || v[0] == 0)
  big_endian_to_int v
end
double_sha256(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 34
def double_sha256(x)
  sha256 sha256(x)
end
encode_hex(b) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 81
def encode_hex(b)
  RLP::Utils.encode_hex b
end
encode_int(n) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 127
def encode_int(n)
  raise ArgumentError, "Integer invalid or out of range: #{n}" unless n.is_a?(Integer) && n >= 0 && n <= UINT_MAX
  int_to_big_endian n
end
function_signature(method_name, arg_types) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 214
def function_signature method_name, arg_types
  "#{method_name}(#{arg_types.join(',')})"
end
hash160(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 42
def hash160(x)
  ripemd160 sha256(x)
end
hash160_hex(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 46
def hash160_hex(x)
  encode_hex hash160(x)
end
int_array_to_bytes(arr) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 143
def int_array_to_bytes(arr)
  arr.pack('C*')
end
int_to_addr(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 123
def int_to_addr(x)
  zpad_int x, 20
end
int_to_big_endian(n) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 93
def int_to_big_endian(n)
  RLP::Sedes.big_endian_int.serialize n
end
keccak256(x) click to toggle source

Not the keccak in sha3, although it's underlying lib named SHA3

# File lib/web3ethereum/abi/utils.rb, line 18
def keccak256(x)
  SHA3::Digest.new(256).digest(x)
end
keccak256_rlp(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 26
def keccak256_rlp(x)
  keccak256 RLP.encode(x)
end
keccak512(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 22
def keccak512(x)
  SHA3::Digest.new(512).digest(x)
end
lpad(x, symbol, l) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 97
def lpad(x, symbol, l)
  return x if x.size >= l
  symbol * (l - x.size) + x
end
mk_contract_address(sender, nonce) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 187
def mk_contract_address(sender, nonce)
  keccak256_rlp([normalize_address(sender), nonce])[12..-1]
end
mk_metropolis_contract_address(sender, initcode) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 191
def mk_metropolis_contract_address(sender, initcode)
  keccak256(normalize_address(sender) + initcode)[12..-1]
end
mod_exp(x, y, n) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 50
def mod_exp(x, y, n)
  x.to_bn.mod_exp(y, n).to_i
end
mod_mul(x, y, n) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 54
def mod_mul(x, y, n)
  x.to_bn.mod_mul(y, n).to_i
end
normalize_address(x, allow_blank: false) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 181
def normalize_address(x, allow_blank: false)
  address = Address.new(x)
  raise ValueError, "address is blank" if !allow_blank && address.blank?
  address.to_bytes
end
normalize_hex_without_prefix(s) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 206
def normalize_hex_without_prefix(s)
  if s[0,2] == '0x'
    (s.size % 2 == 1 ? '0' : '') + s[2..-1]
  else
    s
  end
end
parse_int_or_hex(s) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 196
def parse_int_or_hex(s)
  if s.is_a?(Numeric)
    s
  elsif s[0,2] == '0x'
    big_endian_to_int decode_hex(normalize_hex_without_prefix(s))
  else
    s.to_i
  end
end
ripemd160(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 38
def ripemd160(x)
  Digest::RMD160.digest x
end
rpad(x, symbol, l) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 102
def rpad(x, symbol, l)
  return x if x.size >= l
  x + symbol * (l - x.size)
end
sha256(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 30
def sha256(x)
  SHA3::Digest.digest x
end
signature_hash(signature, length=64) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 218
def signature_hash signature, length=64
  encode_hex(keccak256(signature))[0...length]
end
to_signed(i) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 58
def to_signed(i)
  i > Constant::INT_MAX ? (i-Constant::TT256) : i
end
zpad(x, l) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 107
def zpad(x, l)
  lpad x, BYTE_ZERO, l
end
zpad_hex(s, l=32) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 119
def zpad_hex(s, l=32)
  zpad decode_hex(s), l
end
zpad_int(n, l=32) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 115
def zpad_int(n, l=32)
  zpad encode_int(n), l
end
zunpad(x) click to toggle source
# File lib/web3ethereum/abi/utils.rb, line 111
def zunpad(x)
  x.sub /\A\x00+/, ''
end