Method: JOSE::JWE::ALG_C20P_KW.from_map

Defined in:
lib/jose/jwe/alg_c20p_kw.rb

.from_map(fields) ⇒ Object

JOSE::JWE callbacks



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# File 'lib/jose/jwe/alg_c20p_kw.rb', line 5

def self.from_map(fields)
  bits = nil
  cipher_name = nil
  case fields['alg']
  when 'C20PKW'
    bits = 256
    cipher_name = 'chacha20-poly1305'
  else
    raise ArgumentError, "invalid 'alg' for JWE: #{fields['alg'].inspect}"
  end
  iv = nil
  if fields.has_key?('iv')
    iv = JOSE.urlsafe_decode64(fields['iv'])
  end
  tag = nil
  if fields.has_key?('tag')
    tag = JOSE.urlsafe_decode64(fields['tag'])
  end
  return new(cipher_name, bits, iv, tag), fields.except('alg', 'iv', 'tag')
end