Class: Cryptos::Script

Inherits:
Object
  • Object
show all
Includes:
Utils::Hashes, Utils::Hexas
Defined in:
lib/cryptos/script.rb

Constant Summary collapse

OPCODES = 
{
  'OP_0' => 0x00,
  'OP_PUSHDATA1' => 0x4c,
  'OP_1' => 0x51,
  'OP_2' => 0x52,
  'OP_IF' => 0x63,
  'OP_ELSE' => 0x67,
  'OP_ENDIF' => 0x68,
  'OP_DROP' => 0x75,
  'OP_DUP' => 0x76,
  'OP_EQUAL' =>  0x87,
  'OP_EQUALVERIFY' => 0x88,
  'OP_RIPEMD160' => 0xA6,
  'OP_HASH160' => 0xA9,
  'OP_CHECKSIG' => 0xAC,
  'OP_CHECKMULTISIG' => 0xAE,
  'OP_CHECKLOCKTIMEVERIFY' => 0xB1,
  'OP_CHECKSEQUENCEVERIFY' => 0xB2,
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utils::Hexas

#bignum_to_hex, #bin_to_hex, #byte_to_hex, #bytes_to_hex, #hex_size, #hex_to_little, #int_to_hex, #long_to_hex

Methods included from Utils::Bytes

#bignum_to_bytes, #bytes_to_bignum

Methods included from Utils::Hashes

#hash160, #hash256, #ripemd160, #sha256

Constructor Details

#initialize(script) ⇒ Script

Returns a new instance of Script.



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# File 'lib/cryptos/script.rb', line 81

def initialize(script)
  @script = script.strip
end

Instance Attribute Details

#script ⇒ Object (readonly)

Returns the value of attribute script.



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# File 'lib/cryptos/script.rb', line 25

def script
  @script
end

Class Method Details

.bare(script) ⇒ Object 



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# File 'lib/cryptos/script.rb', line 77

def self.bare(script)
  new script
end

.multisig(address1, address2) ⇒ Object

multisign redeem script



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# File 'lib/cryptos/script.rb', line 60

def self.multisig(address1, address2)
  new "OP_2 #{address1.public_key.to_sec} #{address2.public_key.to_sec} OP_2 OP_CHECKMULTISIG"
end

.p2pkh(address_or_hex) ⇒ Object 



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# File 'lib/cryptos/script.rb', line 46

def self.p2pkh(address_or_hex)
  hash160 = if address_or_hex.is_a? String
              Address.to_hash160 address_or_hex
            else
              address_or_hex.to_hash160
            end
  new "OP_DUP OP_HASH160 #{hash160} OP_EQUALVERIFY OP_CHECKSIG"
end

.p2sh(script) ⇒ Object 



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# File 'lib/cryptos/script.rb', line 55

def self.p2sh(script)
  new "OP_HASH160 #{script.to_hash160} OP_EQUAL"
end

.sig_multisig(der1, der2, redeem_script) ⇒ Object

scriptSig for pay-to-multisig-hash outputs



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# File 'lib/cryptos/script.rb', line 37

def self.sig_multisig(der1, der2, redeem_script)
  new "OP_0 #{der1.serialize} #{der2.serialize} #{redeem_script.to_hex}"
end

.sig_pubkey(der, public_key) ⇒ Object

ScriptSig for pay-to-pubkey-hash outputs

Parameters:

  • der —

    • signature in der format

  • public_key —

    • the public key

Returns:

  • script - a Script object holding scriptSig



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# File 'lib/cryptos/script.rb', line 32

def self.sig_pubkey(der, public_key)
  new "#{der.serialize} #{public_key.to_sec}"
end

.sig_swap(der, public_key, secret, redeem_script) ⇒ Object

scriptSig for atomic swaps



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# File 'lib/cryptos/script.rb', line 42

def self.sig_swap(der, public_key, secret, redeem_script)
  new "#{der.serialize} #{public_key.to_sec} #{secret} OP_1 #{redeem_script.to_hex}"
end

.swap(secret_hash, to_address, locktime, from_address) ⇒ Object 



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# File 'lib/cryptos/script.rb', line 64

def self.swap(secret_hash, to_address, locktime, from_address)
  new %{
    OP_IF
      OP_RIPEMD160 #{secret_hash} OP_EQUALVERIFY
      OP_DUP OP_HASH160 #{to_address.to_hash160}
    OP_ELSE
      #{locktime} OP_CHECKLOCKTIMEVERIFY OP_DROP
      OP_DUP OP_HASH160 #{from_address.to_hash160}
    OP_ENDIF
    OP_EQUALVERIFY OP_CHECKSIG
  }.delete("\n").squeeze ' '
end

Instance Method Details

#size ⇒ Object 



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# File 'lib/cryptos/script.rb', line 102

def size
  [to_hex].pack('H*').size
end

#to_asm ⇒ Object 



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# File 'lib/cryptos/script.rb', line 94

def to_asm
  script.to_s
end

#to_hash160 ⇒ Object 



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# File 'lib/cryptos/script.rb', line 85

def to_hash160
  hash160 to_hex
end

#to_hex ⇒ Object Also known as: serialize 



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# File 'lib/cryptos/script.rb', line 89

def to_hex
  @hex ||= to_asm.split.map { |token| token.start_with?('OP') ? opcode(token) : data(token) }.join
end

#to_s ⇒ Object 



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# File 'lib/cryptos/script.rb', line 98

def to_s
  to_asm
end