Class: FROST::Dealer

Inherits:
Object
  • Object
show all
Defined in:
lib/frost/dealer.rb

Overview

Dealer

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ctx, max_signers, min_signers) ⇒ FROST::Dealer

Create a new dealer.

Parameters:

  • ctx (FROST::Context) —

    FROST context.

  • max_signers (Integer) —

    Maximum number of signers.

Raises:

  • (ArgumentError) 


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# File 'lib/frost/dealer.rb', line 14

def initialize(ctx, max_signers, min_signers)
  raise ArgumentError, "context must be FROST::Context." unless ctx.is_a?(FROST::Context)
  raise ArgumentError, "min_signers must be Integer." unless min_signers.is_a?(Integer)
  raise ArgumentError, "min_signers must be greater than 1." if min_signers < 2
  raise ArgumentError, "max_signers must be Integer." unless max_signers.is_a?(Integer)
  raise ArgumentError, "max_signers must be greater than or equal to min_signers." if max_signers < min_signers
  @ctx = ctx
  @min_signers = min_signers
  @max_signers = max_signers
  key = SigningKey.generate(ctx)
  @polynomial = key.gen_poly(min_signers - 1)
end

Instance Attribute Details

#ctx ⇒ Object (readonly)

Returns the value of attribute ctx.



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# File 'lib/frost/dealer.rb', line 4

def ctx
  @ctx
end

#max_signers ⇒ Object (readonly)

Returns the value of attribute max_signers.



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# File 'lib/frost/dealer.rb', line 5

def max_signers
  @max_signers
end

#min_signers ⇒ Object (readonly)

Returns the value of attribute min_signers.



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# File 'lib/frost/dealer.rb', line 6

def min_signers
  @min_signers
end

#polynomial ⇒ Object (readonly)

Returns the value of attribute polynomial.



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# File 'lib/frost/dealer.rb', line 7

def polynomial
  @polynomial
end

Instance Method Details

#gen_shares(identifiers = nil) ⇒ Array

Generate shares.

Returns:

  • (Array) —

    Array of shares(FROST::SecretShare).

Raises:

  • (ArgumentError) 


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# File 'lib/frost/dealer.rb', line 30

def gen_shares(identifiers = nil)
  raise ArgumentError, "identifiers must be Array." if identifiers && !identifiers.is_a?(Array)
  identifiers = if identifiers
                  identifiers.each do |id|
                    raise ArgumentError, "identifier must be Integer." unless id.is_a?(Integer)
                    raise ArgumentError, "identifier must be greater than 0." if id < 1
                  end
                  identifiers
                else
                  (1..max_signers).to_a
                end
  identifiers.map{ |i| polynomial.gen_share(i) }
end

#group_public_key ⇒ ECDSA::Point

Get a group public key.

Returns:

  • (ECDSA::Point) 


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# File 'lib/frost/dealer.rb', line 46

def group_public_key
  polynomial.verification_point
end