Module: MixinBot::Utils::Crypto

Included in:
MixinBot::Utils
Defined in:
lib/mixin_bot/utils/crypto.rb

Instance Method Summary collapse

Instance Method Details

#access_token(method, uri, body = '', **kwargs) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 6

def access_token(method, uri, body = '', **kwargs)
  sig = Digest::SHA256.hexdigest(method + uri + body.to_s)
  iat = Time.now.utc.to_i
  exp = (Time.now.utc + (kwargs[:exp_in] || 600)).to_i
  scp = kwargs[:scp] || 'FULL'
  jti = SecureRandom.uuid
  uid = kwargs[:app_id] || MixinBot.config.app_id
  sid = kwargs[:session_id] || MixinBot.config.session_id
  private_key = kwargs[:private_key] || MixinBot.config.session_private_key

  payload = {
    uid:,
    sid:,
    iat:,
    exp:,
    jti:,
    sig:,
    scp:
  }

  if private_key.blank?
    raise ConfigurationNotValidError, 'private_key is required'
  elsif private_key.size == 64
    jwk = JOSE::JWK.from_okp [:Ed25519, private_key]
    jws = JOSE::JWS.from({ 'alg' => 'EdDSA' })
  else
    jwk = JOSE::JWK.from_pem private_key
    jws = JOSE::JWS.from({ 'alg' => 'RS512' })
  end

  jwt = JOSE::JWT.from payload
  JOSE::JWT.sign(jwk, jws, jwt).compact
end

#decrypt_pin(msg, shared_key:) ⇒ Object

decrypt the encrpted pin, just for test



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# File 'lib/mixin_bot/utils/crypto.rb', line 144

def decrypt_pin(msg, shared_key:)
  msg = Base64.urlsafe_decode64 msg
  iv = msg[0..15]
  cipher = msg[16..47]
  alg = 'AES-256-CBC'
  decode_cipher = OpenSSL::Cipher.new(alg)
  decode_cipher.decrypt
  decode_cipher.iv = iv
  decode_cipher.key = shared_key
  decode_cipher.update(cipher)
end

#derive_ghost_private_key(public_key, view_key, spend_key, index) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 224

def derive_ghost_private_key(public_key, view_key, spend_key, index)
  mult_value = multiply_keys(public_key:, private_key: view_key)

  x = hash_scalar mult_value, index

  x_scalar = scalar_from_bytes x
  y_scalar = scalar_from_bytes spend_key

  (x_scalar + y_scalar).to_bytes(32)
end

#derive_ghost_public_key(private_key, view_key, spend_key, index) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 213

def derive_ghost_public_key(private_key, view_key, spend_key, index)
  mult_value = multiply_keys(public_key: view_key, private_key:)

  x = hash_scalar mult_value, index

  p1 = JOSE::JWA::Edwards25519Point.stdbase.decode spend_key
  p2 = JOSE::JWA::Edwards25519Point.stdbase * scalar_from_bytes(x).x.to_i

  (p1 + p2).encode
end

#encrypt_pin(pin, **kwargs) ⇒ Object

use timestamp(timestamp) for iterator as default: must be bigger than the previous, the first time must be greater than 0. After a new session created, it will be reset to 0.

Raises:



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# File 'lib/mixin_bot/utils/crypto.rb', line 157

def encrypt_pin(pin, **kwargs)
  pin = MixinBot.utils.decode_key pin

  shared_key = kwargs[:shared_key]
  raise ArgumentError, 'shared_key is required' if shared_key.blank?

  iterator ||= kwargs[:iterator] || Time.now.utc.to_i
  tszero = iterator % 0x100
  tsone = (iterator % 0x10000) >> 8
  tstwo = (iterator % 0x1000000) >> 16
  tsthree = (iterator % 0x100000000) >> 24
  tsstring = "#{tszero.chr}#{tsone.chr}#{tstwo.chr}#{tsthree.chr}\u0000\u0000\u0000\u0000"
  encrypt_content = pin + tsstring + tsstring
  pad_count = 16 - (encrypt_content.length % 16)
  padded_content =
    if pad_count.positive?
      encrypt_content + (pad_count.chr * pad_count)
    else
      encrypt_content
    end

  alg = 'AES-256-CBC'
  aes = OpenSSL::Cipher.new(alg)
  iv = OpenSSL::Cipher.new(alg).random_iv
  aes.encrypt
  aes.key = shared_key
  aes.iv = iv
  cipher = aes.update(padded_content)
  msg = iv + cipher
  Base64.urlsafe_encode64 msg, padding: false
end

#generate_ed25519_key ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 40

def generate_ed25519_key
  ed25519_key = JOSE::JWA::Ed25519.keypair
  {
    private_key: Base64.urlsafe_encode64(ed25519_key[1], padding: false),
    public_key: Base64.urlsafe_encode64(ed25519_key[0], padding: false)
  }
end

#generate_group_conversation_id(user_ids:, name:, owner_id:, random_id: nil) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 114

def generate_group_conversation_id(user_ids:, name:, owner_id:, random_id: nil)
  random_id ||= SecureRandom.uuid

  # Start with owner_id and group name
  gid = unique_uuid(owner_id, name)

  # Combine with random_id
  gid = unique_uuid(gid, random_id)

  # Sort participants and combine with each one
  sorted_participants = user_ids.sort
  sorted_participants.each do |participant|
    gid = unique_uuid(gid, participant)
  end

  gid
end

#generate_rsa_key ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 48

def generate_rsa_key
  rsa_key = OpenSSL::PKey::RSA.new 1024
  {
    private_key: rsa_key.to_pem,
    public_key: rsa_key.public_key.to_pem
  }
end

#generate_trace_from_hash(hash, output_index = 0) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 132

def generate_trace_from_hash(hash, output_index = 0)
  md5 = Digest::MD5.new
  md5 << hash
  md5 << [output_index].pack('c*') if output_index.positive? && output_index < 256
  digest = md5.digest
  digest[6] = ((digest[6].ord & 0x0f) | 0x30).chr
  digest[8] = ((digest[8].ord & 0x3f) | 0x80).chr

  MixinBot::UUID.new(raw: digest).unpacked
end

#generate_unique_uuid(uuid1, uuid2) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 91

def generate_unique_uuid(uuid1, uuid2)
  md5 = Digest::MD5.new
  md5 << [uuid1, uuid2].min
  md5 << [uuid1, uuid2].max
  digest = md5.digest
  digest6 = ((digest[6].ord & 0x0f) | 0x30).chr
  digest8 = ((digest[8].ord & 0x3f) | 0x80).chr
  cipher = digest[0...6] + digest6 + digest[7] + digest8 + digest[9..]

  MixinBot::UUID.new(raw: cipher).unpacked
end

#hash_scalar(pkey, output_index) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 195

def hash_scalar(pkey, output_index)
  tmp = [output_index].pack('Q<').reverse

  hash1 = Digest::Blake3.digest(pkey + tmp)
  hash2 = Digest::Blake3.digest hash1

  hash3 = Digest::Blake3.digest(hash1 + hash2)
  hash4 = Digest::Blake3.digest hash3

  hash3 + hash4
end

#multiply_keys(public_key:, private_key:) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 207

def multiply_keys(public_key:, private_key:)
  public_point = JOSE::JWA::Edwards25519Point.stdbase.decode public_key
  private_scalar = scalar_from_bytes private_key
  (public_point * private_scalar.x.to_i).encode
end

#scalar_from_bytes(raw) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 60

def scalar_from_bytes(raw)
  JOSE::JWA::FieldElement.new(
    # https://github.com/potatosalad/ruby-jose/blob/e1be589b889f1e59ac233a5d19a3fa13f1e4b8a0/lib/jose/jwa/x25519.rb#L122C14-L122C48
    OpenSSL::BN.new(raw.reverse, 2),
    JOSE::JWA::Edwards25519Point::L
  )
end

#shared_public_key(key) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 56

def shared_public_key(key)
  (JOSE::JWA::Edwards25519Point.stdbase * scalar_from_bytes(key[...64]).x.to_i).encode
end

#sign(msg, key:) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 68

def sign(msg, key:)
  msg = Digest::Blake3.digest msg

  pub = shared_public_key key

  y_scalar = scalar_from_bytes key

  key_digest = Digest::SHA512.digest key
  msg_digest = Digest::SHA512.digest(key_digest[-32...] + msg)

  z_scalar = scalar_from_bytes msg_digest[...64]

  r_point = JOSE::JWA::Edwards25519Point.stdbase * z_scalar.x.to_i

  hram_digest = Digest::SHA512.digest(r_point.encode + pub + msg)

  x_scalar = scalar_from_bytes hram_digest[...64]

  s_scalar = (x_scalar * y_scalar) + z_scalar

  r_point.encode + s_scalar.to_bytes(32).ljust(32, "\x00")
end

#tip_public_key(key, counter: 0) ⇒ Object

Raises:



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# File 'lib/mixin_bot/utils/crypto.rb', line 189

def tip_public_key(key, counter: 0)
  raise ArgumentError, 'invalid key' if key.size < 32

  (key[0...32].bytes + MixinBot::Utils.encode_uint64(counter + 1)).pack('c*').unpack1('H*')
end

#unique_uuid(*uuids) ⇒ Object 



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# File 'lib/mixin_bot/utils/crypto.rb', line 103

def unique_uuid(*uuids)
  uuids = uuids.flatten.compact
  uuids.sort
  r = uuids.first
  uuids.each_with_index do |uuid, i|
    r = generate_unique_uuid(r, uuid) if i.positive?
  end

  r
end